[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
/*
|
|
|
|
* sparse memory mappings.
|
|
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
|
|
|
#include <linux/slab.h>
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
#include <linux/mmzone.h>
|
|
|
|
#include <linux/bootmem.h>
|
2014-04-07 22:37:26 +00:00
|
|
|
#include <linux/compiler.h>
|
2005-10-30 01:16:55 +00:00
|
|
|
#include <linux/highmem.h>
|
2011-10-16 06:01:52 +00:00
|
|
|
#include <linux/export.h>
|
2005-09-03 22:54:29 +00:00
|
|
|
#include <linux/spinlock.h>
|
2005-10-30 01:16:55 +00:00
|
|
|
#include <linux/vmalloc.h>
|
2014-04-07 22:37:26 +00:00
|
|
|
|
2008-04-28 09:13:34 +00:00
|
|
|
#include "internal.h"
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
#include <asm/dma.h>
|
2007-10-16 08:24:13 +00:00
|
|
|
#include <asm/pgalloc.h>
|
|
|
|
#include <asm/pgtable.h>
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Permanent SPARSEMEM data:
|
|
|
|
*
|
|
|
|
* 1) mem_section - memory sections, mem_map's for valid memory
|
|
|
|
*/
|
2005-09-03 22:54:28 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
2005-09-03 22:54:26 +00:00
|
|
|
struct mem_section *mem_section[NR_SECTION_ROOTS]
|
2006-01-08 09:01:27 +00:00
|
|
|
____cacheline_internodealigned_in_smp;
|
2005-09-03 22:54:28 +00:00
|
|
|
#else
|
|
|
|
struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
|
2006-01-08 09:01:27 +00:00
|
|
|
____cacheline_internodealigned_in_smp;
|
2005-09-03 22:54:28 +00:00
|
|
|
#endif
|
|
|
|
EXPORT_SYMBOL(mem_section);
|
|
|
|
|
2006-12-07 04:31:45 +00:00
|
|
|
#ifdef NODE_NOT_IN_PAGE_FLAGS
|
|
|
|
/*
|
|
|
|
* If we did not store the node number in the page then we have to
|
|
|
|
* do a lookup in the section_to_node_table in order to find which
|
|
|
|
* node the page belongs to.
|
|
|
|
*/
|
|
|
|
#if MAX_NUMNODES <= 256
|
|
|
|
static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
|
|
|
|
#else
|
|
|
|
static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
|
|
|
|
#endif
|
|
|
|
|
2011-07-26 00:11:51 +00:00
|
|
|
int page_to_nid(const struct page *page)
|
2006-12-07 04:31:45 +00:00
|
|
|
{
|
|
|
|
return section_to_node_table[page_to_section(page)];
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(page_to_nid);
|
2007-08-22 21:01:03 +00:00
|
|
|
|
|
|
|
static void set_section_nid(unsigned long section_nr, int nid)
|
|
|
|
{
|
|
|
|
section_to_node_table[section_nr] = nid;
|
|
|
|
}
|
|
|
|
#else /* !NODE_NOT_IN_PAGE_FLAGS */
|
|
|
|
static inline void set_section_nid(unsigned long section_nr, int nid)
|
|
|
|
{
|
|
|
|
}
|
2006-12-07 04:31:45 +00:00
|
|
|
#endif
|
|
|
|
|
2005-09-03 22:54:28 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
2016-08-02 21:03:33 +00:00
|
|
|
static noinline struct mem_section __ref *sparse_index_alloc(int nid)
|
2005-09-03 22:54:29 +00:00
|
|
|
{
|
|
|
|
struct mem_section *section = NULL;
|
|
|
|
unsigned long array_size = SECTIONS_PER_ROOT *
|
|
|
|
sizeof(struct mem_section);
|
|
|
|
|
2009-09-22 00:01:19 +00:00
|
|
|
if (slab_is_available()) {
|
|
|
|
if (node_state(nid, N_HIGH_MEMORY))
|
2012-07-31 23:46:02 +00:00
|
|
|
section = kzalloc_node(array_size, GFP_KERNEL, nid);
|
2009-09-22 00:01:19 +00:00
|
|
|
else
|
2012-07-31 23:46:02 +00:00
|
|
|
section = kzalloc(array_size, GFP_KERNEL);
|
|
|
|
} else {
|
2014-01-21 23:50:34 +00:00
|
|
|
section = memblock_virt_alloc_node(array_size, nid);
|
2012-07-31 23:46:02 +00:00
|
|
|
}
|
2005-09-03 22:54:29 +00:00
|
|
|
|
|
|
|
return section;
|
2005-09-03 22:54:28 +00:00
|
|
|
}
|
2005-09-03 22:54:26 +00:00
|
|
|
|
2007-05-08 07:23:07 +00:00
|
|
|
static int __meminit sparse_index_init(unsigned long section_nr, int nid)
|
2005-09-03 22:54:26 +00:00
|
|
|
{
|
2005-09-03 22:54:29 +00:00
|
|
|
unsigned long root = SECTION_NR_TO_ROOT(section_nr);
|
|
|
|
struct mem_section *section;
|
2005-09-03 22:54:26 +00:00
|
|
|
|
|
|
|
if (mem_section[root])
|
2005-09-03 22:54:29 +00:00
|
|
|
return -EEXIST;
|
2005-09-03 22:54:28 +00:00
|
|
|
|
2005-09-03 22:54:29 +00:00
|
|
|
section = sparse_index_alloc(nid);
|
2007-12-18 00:19:58 +00:00
|
|
|
if (!section)
|
|
|
|
return -ENOMEM;
|
2005-09-03 22:54:29 +00:00
|
|
|
|
|
|
|
mem_section[root] = section;
|
2012-07-31 23:46:06 +00:00
|
|
|
|
2013-05-17 14:10:38 +00:00
|
|
|
return 0;
|
2005-09-03 22:54:29 +00:00
|
|
|
}
|
|
|
|
#else /* !SPARSEMEM_EXTREME */
|
|
|
|
static inline int sparse_index_init(unsigned long section_nr, int nid)
|
|
|
|
{
|
|
|
|
return 0;
|
2005-09-03 22:54:26 +00:00
|
|
|
}
|
2005-09-03 22:54:29 +00:00
|
|
|
#endif
|
|
|
|
|
2016-07-28 22:48:35 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
2005-10-30 01:16:51 +00:00
|
|
|
int __section_nr(struct mem_section* ms)
|
|
|
|
{
|
|
|
|
unsigned long root_nr;
|
|
|
|
struct mem_section* root;
|
|
|
|
|
2006-05-20 22:00:05 +00:00
|
|
|
for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) {
|
|
|
|
root = __nr_to_section(root_nr * SECTIONS_PER_ROOT);
|
2005-10-30 01:16:51 +00:00
|
|
|
if (!root)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT)))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2012-07-31 23:46:04 +00:00
|
|
|
VM_BUG_ON(root_nr == NR_SECTION_ROOTS);
|
|
|
|
|
2005-10-30 01:16:51 +00:00
|
|
|
return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
|
|
|
|
}
|
2016-07-28 22:48:35 +00:00
|
|
|
#else
|
|
|
|
int __section_nr(struct mem_section* ms)
|
|
|
|
{
|
|
|
|
return (int)(ms - mem_section[0]);
|
|
|
|
}
|
|
|
|
#endif
|
2005-10-30 01:16:51 +00:00
|
|
|
|
2006-06-23 09:03:41 +00:00
|
|
|
/*
|
|
|
|
* During early boot, before section_mem_map is used for an actual
|
|
|
|
* mem_map, we use section_mem_map to store the section's NUMA
|
|
|
|
* node. This keeps us from having to use another data structure. The
|
|
|
|
* node information is cleared just before we store the real mem_map.
|
|
|
|
*/
|
|
|
|
static inline unsigned long sparse_encode_early_nid(int nid)
|
|
|
|
{
|
|
|
|
return (nid << SECTION_NID_SHIFT);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int sparse_early_nid(struct mem_section *section)
|
|
|
|
{
|
|
|
|
return (section->section_mem_map >> SECTION_NID_SHIFT);
|
|
|
|
}
|
|
|
|
|
2008-07-24 04:26:52 +00:00
|
|
|
/* Validate the physical addressing limitations of the model */
|
|
|
|
void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
|
|
|
|
unsigned long *end_pfn)
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
{
|
2008-07-24 04:26:52 +00:00
|
|
|
unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
|
2008-04-15 23:40:00 +00:00
|
|
|
/*
|
|
|
|
* Sanity checks - do not allow an architecture to pass
|
|
|
|
* in larger pfns than the maximum scope of sparsemem:
|
|
|
|
*/
|
2008-07-24 04:26:52 +00:00
|
|
|
if (*start_pfn > max_sparsemem_pfn) {
|
|
|
|
mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
|
|
|
|
"Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
|
|
|
|
*start_pfn, *end_pfn, max_sparsemem_pfn);
|
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
*start_pfn = max_sparsemem_pfn;
|
|
|
|
*end_pfn = max_sparsemem_pfn;
|
2009-03-31 22:19:25 +00:00
|
|
|
} else if (*end_pfn > max_sparsemem_pfn) {
|
2008-07-24 04:26:52 +00:00
|
|
|
mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
|
|
|
|
"End of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
|
|
|
|
*start_pfn, *end_pfn, max_sparsemem_pfn);
|
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
*end_pfn = max_sparsemem_pfn;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Record a memory area against a node. */
|
|
|
|
void __init memory_present(int nid, unsigned long start, unsigned long end)
|
|
|
|
{
|
|
|
|
unsigned long pfn;
|
2008-04-15 23:40:00 +00:00
|
|
|
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
start &= PAGE_SECTION_MASK;
|
2008-07-24 04:26:52 +00:00
|
|
|
mminit_validate_memmodel_limits(&start, &end);
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
|
|
|
|
unsigned long section = pfn_to_section_nr(pfn);
|
2005-09-03 22:54:26 +00:00
|
|
|
struct mem_section *ms;
|
|
|
|
|
|
|
|
sparse_index_init(section, nid);
|
2007-08-22 21:01:03 +00:00
|
|
|
set_section_nid(section, nid);
|
2005-09-03 22:54:26 +00:00
|
|
|
|
|
|
|
ms = __nr_to_section(section);
|
|
|
|
if (!ms->section_mem_map)
|
2006-06-23 09:03:41 +00:00
|
|
|
ms->section_mem_map = sparse_encode_early_nid(nid) |
|
|
|
|
SECTION_MARKED_PRESENT;
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Only used by the i386 NUMA architecures, but relatively
|
|
|
|
* generic code.
|
|
|
|
*/
|
|
|
|
unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn,
|
|
|
|
unsigned long end_pfn)
|
|
|
|
{
|
|
|
|
unsigned long pfn;
|
|
|
|
unsigned long nr_pages = 0;
|
|
|
|
|
2008-07-24 04:26:52 +00:00
|
|
|
mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
|
|
|
|
if (nid != early_pfn_to_nid(pfn))
|
|
|
|
continue;
|
|
|
|
|
2007-10-16 08:24:11 +00:00
|
|
|
if (pfn_present(pfn))
|
[PATCH] sparsemem memory model
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of
mem_map[] is needed by discontiguous memory machines (like in the old
CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem
replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually
become a complete replacement.
A significant advantage over DISCONTIGMEM is that it's completely separated
from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA
and DISCONTIG are often confused.
Another advantage is that sparse doesn't require each NUMA node's ranges to be
contiguous. It can handle overlapping ranges between nodes with no problems,
where DISCONTIGMEM currently throws away that memory.
Sparsemem uses an array to provide different pfn_to_page() translations for
each SECTION_SIZE area of physical memory. This is what allows the mem_map[]
to be chopped up.
In order to do quick pfn_to_page() operations, the section number of the page
is encoded in page->flags. Part of the sparsemem infrastructure enables
sharing of these bits more dynamically (at compile-time) between the
page_zone() and sparsemem operations. However, on 32-bit architectures, the
number of bits is quite limited, and may require growing the size of the
page->flags type in certain conditions. Several things might force this to
occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of
memory), an increase in the physical address space, or an increase in the
number of used page->flags.
One thing to note is that, once sparsemem is present, the NUMA node
information no longer needs to be stored in the page->flags. It might provide
speed increases on certain platforms and will be stored there if there is
room. But, if out of room, an alternate (theoretically slower) mechanism is
used.
This patch introduces CONFIG_FLATMEM. It is used in almost all cases where
there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM
often have to compile out the same areas of code.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 07:07:54 +00:00
|
|
|
nr_pages += PAGES_PER_SECTION;
|
|
|
|
}
|
|
|
|
|
|
|
|
return nr_pages * sizeof(struct page);
|
|
|
|
}
|
|
|
|
|
2005-06-23 07:08:00 +00:00
|
|
|
/*
|
|
|
|
* Subtle, we encode the real pfn into the mem_map such that
|
|
|
|
* the identity pfn - section_mem_map will return the actual
|
|
|
|
* physical page frame number.
|
|
|
|
*/
|
|
|
|
static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
|
|
|
|
{
|
|
|
|
return (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2008-04-28 09:12:01 +00:00
|
|
|
* Decode mem_map from the coded memmap
|
2005-06-23 07:08:00 +00:00
|
|
|
*/
|
|
|
|
struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
|
|
|
|
{
|
2008-04-28 09:12:01 +00:00
|
|
|
/* mask off the extra low bits of information */
|
|
|
|
coded_mem_map &= SECTION_MAP_MASK;
|
2005-06-23 07:08:00 +00:00
|
|
|
return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
|
|
|
|
}
|
|
|
|
|
2007-05-08 07:23:07 +00:00
|
|
|
static int __meminit sparse_init_one_section(struct mem_section *ms,
|
2007-10-16 08:25:56 +00:00
|
|
|
unsigned long pnum, struct page *mem_map,
|
|
|
|
unsigned long *pageblock_bitmap)
|
2005-06-23 07:08:00 +00:00
|
|
|
{
|
2007-10-16 08:24:11 +00:00
|
|
|
if (!present_section(ms))
|
2005-06-23 07:08:00 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
2006-06-23 09:03:41 +00:00
|
|
|
ms->section_mem_map &= ~SECTION_MAP_MASK;
|
2007-10-16 08:24:11 +00:00
|
|
|
ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
|
|
|
|
SECTION_HAS_MEM_MAP;
|
2007-10-16 08:25:56 +00:00
|
|
|
ms->pageblock_flags = pageblock_bitmap;
|
2005-06-23 07:08:00 +00:00
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
memory hotplug: register section/node id to free
This patch set is to free pages which is allocated by bootmem for
memory-hotremove. Some structures of memory management are allocated by
bootmem. ex) memmap, etc.
To remove memory physically, some of them must be freed according to
circumstance. This patch set makes basis to free those pages, and free
memmaps.
Basic my idea is using remain members of struct page to remember information
of users of bootmem (section number or node id). When the section is
removing, kernel can confirm it. By this information, some issues can be
solved.
1) When the memmap of removing section is allocated on other
section by bootmem, it should/can be free.
2) When the memmap of removing section is allocated on the
same section, it shouldn't be freed. Because the section has to be
logical memory offlined already and all pages must be isolated against
page allocater. If it is freed, page allocator may use it which will
be removed physically soon.
3) When removing section has other section's memmap,
kernel will be able to show easily which section should be removed
before it for user. (Not implemented yet)
4) When the above case 2), the page isolation will be able to check and skip
memmap's page when logical memory offline (offline_pages()).
Current page isolation code fails in this case because this page is
just reserved page and it can't distinguish this pages can be
removed or not. But, it will be able to do by this patch.
(Not implemented yet.)
5) The node information like pgdat has similar issues. But, this
will be able to be solved too by this.
(Not implemented yet, but, remembering node id in the pages.)
Fortunately, current bootmem allocator just keeps PageReserved flags,
and doesn't use any other members of page struct. The users of
bootmem doesn't use them too.
This patch:
This is to register information which is node or section's id. Kernel can
distinguish which node/section uses the pages allcated by bootmem. This is
basis for hot-remove sections or nodes.
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-28 09:13:31 +00:00
|
|
|
unsigned long usemap_size(void)
|
2007-10-16 08:25:56 +00:00
|
|
|
{
|
|
|
|
unsigned long size_bytes;
|
|
|
|
size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
|
|
|
|
size_bytes = roundup(size_bytes, sizeof(unsigned long));
|
|
|
|
return size_bytes;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
|
|
static unsigned long *__kmalloc_section_usemap(void)
|
|
|
|
{
|
|
|
|
return kmalloc(usemap_size(), GFP_KERNEL);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|
|
|
|
|
2008-07-24 04:28:15 +00:00
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
|
|
static unsigned long * __init
|
2010-02-10 09:20:21 +00:00
|
|
|
sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
|
2012-05-29 22:06:36 +00:00
|
|
|
unsigned long size)
|
2008-07-24 04:28:15 +00:00
|
|
|
{
|
2012-07-11 21:02:53 +00:00
|
|
|
unsigned long goal, limit;
|
|
|
|
unsigned long *p;
|
|
|
|
int nid;
|
2008-07-24 04:28:15 +00:00
|
|
|
/*
|
|
|
|
* A page may contain usemaps for other sections preventing the
|
|
|
|
* page being freed and making a section unremovable while
|
2014-03-31 08:41:58 +00:00
|
|
|
* other sections referencing the usemap remain active. Similarly,
|
2008-07-24 04:28:15 +00:00
|
|
|
* a pgdat can prevent a section being removed. If section A
|
|
|
|
* contains a pgdat and section B contains the usemap, both
|
|
|
|
* sections become inter-dependent. This allocates usemaps
|
|
|
|
* from the same section as the pgdat where possible to avoid
|
|
|
|
* this problem.
|
|
|
|
*/
|
2012-07-11 21:02:51 +00:00
|
|
|
goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT);
|
2012-07-11 21:02:53 +00:00
|
|
|
limit = goal + (1UL << PA_SECTION_SHIFT);
|
|
|
|
nid = early_pfn_to_nid(goal >> PAGE_SHIFT);
|
|
|
|
again:
|
2014-01-21 23:50:34 +00:00
|
|
|
p = memblock_virt_alloc_try_nid_nopanic(size,
|
|
|
|
SMP_CACHE_BYTES, goal, limit,
|
|
|
|
nid);
|
2012-07-11 21:02:53 +00:00
|
|
|
if (!p && limit) {
|
|
|
|
limit = 0;
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
return p;
|
2008-07-24 04:28:15 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
|
|
|
|
{
|
|
|
|
unsigned long usemap_snr, pgdat_snr;
|
|
|
|
static unsigned long old_usemap_snr = NR_MEM_SECTIONS;
|
|
|
|
static unsigned long old_pgdat_snr = NR_MEM_SECTIONS;
|
|
|
|
struct pglist_data *pgdat = NODE_DATA(nid);
|
|
|
|
int usemap_nid;
|
|
|
|
|
|
|
|
usemap_snr = pfn_to_section_nr(__pa(usemap) >> PAGE_SHIFT);
|
|
|
|
pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
|
|
|
|
if (usemap_snr == pgdat_snr)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr)
|
|
|
|
/* skip redundant message */
|
|
|
|
return;
|
|
|
|
|
|
|
|
old_usemap_snr = usemap_snr;
|
|
|
|
old_pgdat_snr = pgdat_snr;
|
|
|
|
|
|
|
|
usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr));
|
|
|
|
if (usemap_nid != nid) {
|
2016-03-17 21:19:50 +00:00
|
|
|
pr_info("node %d must be removed before remove section %ld\n",
|
|
|
|
nid, usemap_snr);
|
2008-07-24 04:28:15 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* There is a circular dependency.
|
|
|
|
* Some platforms allow un-removable section because they will just
|
|
|
|
* gather other removable sections for dynamic partitioning.
|
|
|
|
* Just notify un-removable section's number here.
|
|
|
|
*/
|
2016-03-17 21:19:50 +00:00
|
|
|
pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n",
|
|
|
|
usemap_snr, pgdat_snr, nid);
|
2008-07-24 04:28:15 +00:00
|
|
|
}
|
|
|
|
#else
|
|
|
|
static unsigned long * __init
|
2010-02-10 09:20:21 +00:00
|
|
|
sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
|
2012-05-29 22:06:36 +00:00
|
|
|
unsigned long size)
|
2008-07-24 04:28:15 +00:00
|
|
|
{
|
2014-01-21 23:50:34 +00:00
|
|
|
return memblock_virt_alloc_node_nopanic(size, pgdat->node_id);
|
2008-07-24 04:28:15 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
|
|
|
2013-09-11 21:22:38 +00:00
|
|
|
static void __init sparse_early_usemaps_alloc_node(void *data,
|
2010-02-10 09:20:21 +00:00
|
|
|
unsigned long pnum_begin,
|
|
|
|
unsigned long pnum_end,
|
|
|
|
unsigned long usemap_count, int nodeid)
|
2007-10-16 08:25:56 +00:00
|
|
|
{
|
2010-02-10 09:20:21 +00:00
|
|
|
void *usemap;
|
|
|
|
unsigned long pnum;
|
2013-09-11 21:22:38 +00:00
|
|
|
unsigned long **usemap_map = (unsigned long **)data;
|
2010-02-10 09:20:21 +00:00
|
|
|
int size = usemap_size();
|
2007-10-16 08:25:56 +00:00
|
|
|
|
2010-02-10 09:20:21 +00:00
|
|
|
usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid),
|
2012-05-29 22:06:36 +00:00
|
|
|
size * usemap_count);
|
bootmem/sparsemem: remove limit constraint in alloc_bootmem_section
While testing AMS (Active Memory Sharing) / CMO (Cooperative Memory
Overcommit) on powerpc, we tripped the following:
kernel BUG at mm/bootmem.c:483!
cpu 0x0: Vector: 700 (Program Check) at [c000000000c03940]
pc: c000000000a62bd8: .alloc_bootmem_core+0x90/0x39c
lr: c000000000a64bcc: .sparse_early_usemaps_alloc_node+0x84/0x29c
sp: c000000000c03bc0
msr: 8000000000021032
current = 0xc000000000b0cce0
paca = 0xc000000001d80000
pid = 0, comm = swapper
kernel BUG at mm/bootmem.c:483!
enter ? for help
[c000000000c03c80] c000000000a64bcc
.sparse_early_usemaps_alloc_node+0x84/0x29c
[c000000000c03d50] c000000000a64f10 .sparse_init+0x12c/0x28c
[c000000000c03e20] c000000000a474f4 .setup_arch+0x20c/0x294
[c000000000c03ee0] c000000000a4079c .start_kernel+0xb4/0x460
[c000000000c03f90] c000000000009670 .start_here_common+0x1c/0x2c
This is
BUG_ON(limit && goal + size > limit);
and after some debugging, it seems that
goal = 0x7ffff000000
limit = 0x80000000000
and sparse_early_usemaps_alloc_node ->
sparse_early_usemaps_alloc_pgdat_section calls
return alloc_bootmem_section(usemap_size() * count, section_nr);
This is on a system with 8TB available via the AMS pool, and as a quirk
of AMS in firmware, all of that memory shows up in node 0. So, we end
up with an allocation that will fail the goal/limit constraints.
In theory, we could "fall-back" to alloc_bootmem_node() in
sparse_early_usemaps_alloc_node(), but since we actually have HOTREMOVE
defined, we'll BUG_ON() instead. A simple solution appears to be to
unconditionally remove the limit condition in alloc_bootmem_section,
meaning allocations are allowed to cross section boundaries (necessary
for systems of this size).
Johannes Weiner pointed out that if alloc_bootmem_section() no longer
guarantees section-locality, we need check_usemap_section_nr() to print
possible cross-dependencies between node descriptors and the usemaps
allocated through it. That makes the two loops in
sparse_early_usemaps_alloc_node() identical, so re-factor the code a
bit.
[akpm@linux-foundation.org: code simplification]
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Anton Blanchard <anton@au1.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ben Herrenschmidt <benh@kernel.crashing.org>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: <stable@vger.kernel.org> [3.3.1]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-21 23:34:07 +00:00
|
|
|
if (!usemap) {
|
2016-03-17 21:19:50 +00:00
|
|
|
pr_warn("%s: allocation failed\n", __func__);
|
2012-05-29 22:06:36 +00:00
|
|
|
return;
|
2008-07-24 04:28:15 +00:00
|
|
|
}
|
|
|
|
|
bootmem/sparsemem: remove limit constraint in alloc_bootmem_section
While testing AMS (Active Memory Sharing) / CMO (Cooperative Memory
Overcommit) on powerpc, we tripped the following:
kernel BUG at mm/bootmem.c:483!
cpu 0x0: Vector: 700 (Program Check) at [c000000000c03940]
pc: c000000000a62bd8: .alloc_bootmem_core+0x90/0x39c
lr: c000000000a64bcc: .sparse_early_usemaps_alloc_node+0x84/0x29c
sp: c000000000c03bc0
msr: 8000000000021032
current = 0xc000000000b0cce0
paca = 0xc000000001d80000
pid = 0, comm = swapper
kernel BUG at mm/bootmem.c:483!
enter ? for help
[c000000000c03c80] c000000000a64bcc
.sparse_early_usemaps_alloc_node+0x84/0x29c
[c000000000c03d50] c000000000a64f10 .sparse_init+0x12c/0x28c
[c000000000c03e20] c000000000a474f4 .setup_arch+0x20c/0x294
[c000000000c03ee0] c000000000a4079c .start_kernel+0xb4/0x460
[c000000000c03f90] c000000000009670 .start_here_common+0x1c/0x2c
This is
BUG_ON(limit && goal + size > limit);
and after some debugging, it seems that
goal = 0x7ffff000000
limit = 0x80000000000
and sparse_early_usemaps_alloc_node ->
sparse_early_usemaps_alloc_pgdat_section calls
return alloc_bootmem_section(usemap_size() * count, section_nr);
This is on a system with 8TB available via the AMS pool, and as a quirk
of AMS in firmware, all of that memory shows up in node 0. So, we end
up with an allocation that will fail the goal/limit constraints.
In theory, we could "fall-back" to alloc_bootmem_node() in
sparse_early_usemaps_alloc_node(), but since we actually have HOTREMOVE
defined, we'll BUG_ON() instead. A simple solution appears to be to
unconditionally remove the limit condition in alloc_bootmem_section,
meaning allocations are allowed to cross section boundaries (necessary
for systems of this size).
Johannes Weiner pointed out that if alloc_bootmem_section() no longer
guarantees section-locality, we need check_usemap_section_nr() to print
possible cross-dependencies between node descriptors and the usemaps
allocated through it. That makes the two loops in
sparse_early_usemaps_alloc_node() identical, so re-factor the code a
bit.
[akpm@linux-foundation.org: code simplification]
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Anton Blanchard <anton@au1.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ben Herrenschmidt <benh@kernel.crashing.org>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: <stable@vger.kernel.org> [3.3.1]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-21 23:34:07 +00:00
|
|
|
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
|
|
|
|
if (!present_section_nr(pnum))
|
|
|
|
continue;
|
|
|
|
usemap_map[pnum] = usemap;
|
|
|
|
usemap += size;
|
|
|
|
check_usemap_section_nr(nodeid, usemap_map[pnum]);
|
2010-02-10 09:20:21 +00:00
|
|
|
}
|
2007-10-16 08:25:56 +00:00
|
|
|
}
|
|
|
|
|
2007-10-16 08:24:13 +00:00
|
|
|
#ifndef CONFIG_SPARSEMEM_VMEMMAP
|
2007-10-16 08:26:14 +00:00
|
|
|
struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
|
2005-06-23 07:08:00 +00:00
|
|
|
{
|
|
|
|
struct page *map;
|
2010-05-24 21:31:57 +00:00
|
|
|
unsigned long size;
|
2005-06-23 07:08:00 +00:00
|
|
|
|
|
|
|
map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
|
|
|
|
if (map)
|
|
|
|
return map;
|
|
|
|
|
2010-05-24 21:31:57 +00:00
|
|
|
size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
|
2014-01-21 23:50:34 +00:00
|
|
|
map = memblock_virt_alloc_try_nid(size,
|
|
|
|
PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
|
|
|
|
BOOTMEM_ALLOC_ACCESSIBLE, nid);
|
2007-10-16 08:24:13 +00:00
|
|
|
return map;
|
|
|
|
}
|
2010-02-10 09:20:22 +00:00
|
|
|
void __init sparse_mem_maps_populate_node(struct page **map_map,
|
|
|
|
unsigned long pnum_begin,
|
|
|
|
unsigned long pnum_end,
|
|
|
|
unsigned long map_count, int nodeid)
|
|
|
|
{
|
|
|
|
void *map;
|
|
|
|
unsigned long pnum;
|
|
|
|
unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
|
|
|
|
|
|
|
|
map = alloc_remap(nodeid, size * map_count);
|
|
|
|
if (map) {
|
|
|
|
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
|
|
|
|
if (!present_section_nr(pnum))
|
|
|
|
continue;
|
|
|
|
map_map[pnum] = map;
|
|
|
|
map += size;
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
size = PAGE_ALIGN(size);
|
2014-01-21 23:50:34 +00:00
|
|
|
map = memblock_virt_alloc_try_nid(size * map_count,
|
|
|
|
PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
|
|
|
|
BOOTMEM_ALLOC_ACCESSIBLE, nodeid);
|
2010-02-10 09:20:22 +00:00
|
|
|
if (map) {
|
|
|
|
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
|
|
|
|
if (!present_section_nr(pnum))
|
|
|
|
continue;
|
|
|
|
map_map[pnum] = map;
|
|
|
|
map += size;
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* fallback */
|
|
|
|
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
|
|
|
|
struct mem_section *ms;
|
|
|
|
|
|
|
|
if (!present_section_nr(pnum))
|
|
|
|
continue;
|
|
|
|
map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
|
|
|
|
if (map_map[pnum])
|
|
|
|
continue;
|
|
|
|
ms = __nr_to_section(pnum);
|
2016-03-17 21:19:50 +00:00
|
|
|
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
|
2016-03-17 21:19:47 +00:00
|
|
|
__func__);
|
2010-02-10 09:20:22 +00:00
|
|
|
ms->section_mem_map = 0;
|
|
|
|
}
|
|
|
|
}
|
2007-10-16 08:24:13 +00:00
|
|
|
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
|
|
|
|
|
2010-02-27 17:29:38 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
|
2013-09-11 21:22:38 +00:00
|
|
|
static void __init sparse_early_mem_maps_alloc_node(void *data,
|
2010-02-10 09:20:22 +00:00
|
|
|
unsigned long pnum_begin,
|
|
|
|
unsigned long pnum_end,
|
|
|
|
unsigned long map_count, int nodeid)
|
|
|
|
{
|
2013-09-11 21:22:38 +00:00
|
|
|
struct page **map_map = (struct page **)data;
|
2010-02-10 09:20:22 +00:00
|
|
|
sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
|
|
|
|
map_count, nodeid);
|
|
|
|
}
|
2010-02-27 17:29:38 +00:00
|
|
|
#else
|
2008-07-26 02:46:22 +00:00
|
|
|
static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
|
2007-10-16 08:24:13 +00:00
|
|
|
{
|
|
|
|
struct page *map;
|
|
|
|
struct mem_section *ms = __nr_to_section(pnum);
|
|
|
|
int nid = sparse_early_nid(ms);
|
|
|
|
|
2007-10-16 08:26:14 +00:00
|
|
|
map = sparse_mem_map_populate(pnum, nid);
|
2005-06-23 07:08:00 +00:00
|
|
|
if (map)
|
|
|
|
return map;
|
|
|
|
|
2016-03-17 21:19:50 +00:00
|
|
|
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
|
2016-03-17 21:19:47 +00:00
|
|
|
__func__);
|
2005-09-03 22:54:26 +00:00
|
|
|
ms->section_mem_map = 0;
|
2005-06-23 07:08:00 +00:00
|
|
|
return NULL;
|
|
|
|
}
|
2010-02-10 09:20:22 +00:00
|
|
|
#endif
|
2005-06-23 07:08:00 +00:00
|
|
|
|
2014-04-07 22:37:26 +00:00
|
|
|
void __weak __meminit vmemmap_populate_print_last(void)
|
2008-04-12 08:19:24 +00:00
|
|
|
{
|
|
|
|
}
|
2010-02-10 09:20:21 +00:00
|
|
|
|
2013-09-11 21:22:38 +00:00
|
|
|
/**
|
|
|
|
* alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap
|
|
|
|
* @map: usemap_map for pageblock flags or mmap_map for vmemmap
|
|
|
|
*/
|
|
|
|
static void __init alloc_usemap_and_memmap(void (*alloc_func)
|
|
|
|
(void *, unsigned long, unsigned long,
|
|
|
|
unsigned long, int), void *data)
|
|
|
|
{
|
|
|
|
unsigned long pnum;
|
|
|
|
unsigned long map_count;
|
|
|
|
int nodeid_begin = 0;
|
|
|
|
unsigned long pnum_begin = 0;
|
|
|
|
|
|
|
|
for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
|
|
|
|
struct mem_section *ms;
|
|
|
|
|
|
|
|
if (!present_section_nr(pnum))
|
|
|
|
continue;
|
|
|
|
ms = __nr_to_section(pnum);
|
|
|
|
nodeid_begin = sparse_early_nid(ms);
|
|
|
|
pnum_begin = pnum;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
map_count = 1;
|
|
|
|
for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) {
|
|
|
|
struct mem_section *ms;
|
|
|
|
int nodeid;
|
|
|
|
|
|
|
|
if (!present_section_nr(pnum))
|
|
|
|
continue;
|
|
|
|
ms = __nr_to_section(pnum);
|
|
|
|
nodeid = sparse_early_nid(ms);
|
|
|
|
if (nodeid == nodeid_begin) {
|
|
|
|
map_count++;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
/* ok, we need to take cake of from pnum_begin to pnum - 1*/
|
|
|
|
alloc_func(data, pnum_begin, pnum,
|
|
|
|
map_count, nodeid_begin);
|
|
|
|
/* new start, update count etc*/
|
|
|
|
nodeid_begin = nodeid;
|
|
|
|
pnum_begin = pnum;
|
|
|
|
map_count = 1;
|
|
|
|
}
|
|
|
|
/* ok, last chunk */
|
|
|
|
alloc_func(data, pnum_begin, NR_MEM_SECTIONS,
|
|
|
|
map_count, nodeid_begin);
|
|
|
|
}
|
|
|
|
|
2007-06-08 20:46:51 +00:00
|
|
|
/*
|
|
|
|
* Allocate the accumulated non-linear sections, allocate a mem_map
|
|
|
|
* for each and record the physical to section mapping.
|
|
|
|
*/
|
|
|
|
void __init sparse_init(void)
|
|
|
|
{
|
|
|
|
unsigned long pnum;
|
|
|
|
struct page *map;
|
2007-10-16 08:25:56 +00:00
|
|
|
unsigned long *usemap;
|
2008-04-13 18:51:06 +00:00
|
|
|
unsigned long **usemap_map;
|
2010-02-27 17:29:38 +00:00
|
|
|
int size;
|
|
|
|
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
|
|
|
|
int size2;
|
|
|
|
struct page **map_map;
|
|
|
|
#endif
|
2008-04-13 18:51:06 +00:00
|
|
|
|
2013-07-03 22:04:44 +00:00
|
|
|
/* see include/linux/mmzone.h 'struct mem_section' definition */
|
|
|
|
BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
|
|
|
|
|
2012-07-31 23:43:19 +00:00
|
|
|
/* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */
|
|
|
|
set_pageblock_order();
|
|
|
|
|
2008-04-13 18:51:06 +00:00
|
|
|
/*
|
|
|
|
* map is using big page (aka 2M in x86 64 bit)
|
|
|
|
* usemap is less one page (aka 24 bytes)
|
|
|
|
* so alloc 2M (with 2M align) and 24 bytes in turn will
|
|
|
|
* make next 2M slip to one more 2M later.
|
|
|
|
* then in big system, the memory will have a lot of holes...
|
2011-03-31 01:57:33 +00:00
|
|
|
* here try to allocate 2M pages continuously.
|
2008-04-13 18:51:06 +00:00
|
|
|
*
|
|
|
|
* powerpc need to call sparse_init_one_section right after each
|
|
|
|
* sparse_early_mem_map_alloc, so allocate usemap_map at first.
|
|
|
|
*/
|
|
|
|
size = sizeof(unsigned long *) * NR_MEM_SECTIONS;
|
2014-01-21 23:50:34 +00:00
|
|
|
usemap_map = memblock_virt_alloc(size, 0);
|
2008-04-13 18:51:06 +00:00
|
|
|
if (!usemap_map)
|
|
|
|
panic("can not allocate usemap_map\n");
|
2013-09-11 21:22:38 +00:00
|
|
|
alloc_usemap_and_memmap(sparse_early_usemaps_alloc_node,
|
|
|
|
(void *)usemap_map);
|
2007-06-08 20:46:51 +00:00
|
|
|
|
2010-02-10 09:20:22 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
|
|
|
|
size2 = sizeof(struct page *) * NR_MEM_SECTIONS;
|
2014-01-21 23:50:34 +00:00
|
|
|
map_map = memblock_virt_alloc(size2, 0);
|
2010-02-10 09:20:22 +00:00
|
|
|
if (!map_map)
|
|
|
|
panic("can not allocate map_map\n");
|
2013-09-11 21:22:38 +00:00
|
|
|
alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node,
|
|
|
|
(void *)map_map);
|
2010-02-10 09:20:22 +00:00
|
|
|
#endif
|
|
|
|
|
2008-04-13 18:51:06 +00:00
|
|
|
for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
|
|
|
|
if (!present_section_nr(pnum))
|
2007-06-08 20:46:51 +00:00
|
|
|
continue;
|
2007-10-16 08:25:56 +00:00
|
|
|
|
2008-04-13 18:51:06 +00:00
|
|
|
usemap = usemap_map[pnum];
|
2007-10-16 08:25:56 +00:00
|
|
|
if (!usemap)
|
|
|
|
continue;
|
|
|
|
|
2010-02-10 09:20:22 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
|
|
|
|
map = map_map[pnum];
|
|
|
|
#else
|
2008-04-13 18:51:06 +00:00
|
|
|
map = sparse_early_mem_map_alloc(pnum);
|
2010-02-10 09:20:22 +00:00
|
|
|
#endif
|
2008-04-13 18:51:06 +00:00
|
|
|
if (!map)
|
|
|
|
continue;
|
|
|
|
|
2007-10-16 08:25:56 +00:00
|
|
|
sparse_init_one_section(__nr_to_section(pnum), pnum, map,
|
|
|
|
usemap);
|
2007-06-08 20:46:51 +00:00
|
|
|
}
|
2008-04-13 18:51:06 +00:00
|
|
|
|
2008-04-12 08:19:24 +00:00
|
|
|
vmemmap_populate_print_last();
|
|
|
|
|
2010-02-10 09:20:22 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
|
2014-01-21 23:50:34 +00:00
|
|
|
memblock_free_early(__pa(map_map), size2);
|
2010-02-10 09:20:22 +00:00
|
|
|
#endif
|
2014-01-21 23:50:34 +00:00
|
|
|
memblock_free_early(__pa(usemap_map), size);
|
2007-06-08 20:46:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
2007-10-16 08:26:14 +00:00
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
2013-11-12 23:07:42 +00:00
|
|
|
static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid)
|
2007-10-16 08:26:14 +00:00
|
|
|
{
|
|
|
|
/* This will make the necessary allocations eventually. */
|
|
|
|
return sparse_mem_map_populate(pnum, nid);
|
|
|
|
}
|
2013-11-12 23:07:42 +00:00
|
|
|
static void __kfree_section_memmap(struct page *memmap)
|
2007-10-16 08:26:14 +00:00
|
|
|
{
|
2013-04-29 22:07:50 +00:00
|
|
|
unsigned long start = (unsigned long)memmap;
|
2013-11-12 23:07:42 +00:00
|
|
|
unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
|
2013-04-29 22:07:50 +00:00
|
|
|
|
|
|
|
vmemmap_free(start, end);
|
2007-10-16 08:26:14 +00:00
|
|
|
}
|
2013-04-29 22:08:22 +00:00
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
2013-11-12 23:07:43 +00:00
|
|
|
static void free_map_bootmem(struct page *memmap)
|
2008-04-28 09:13:34 +00:00
|
|
|
{
|
2013-04-29 22:07:50 +00:00
|
|
|
unsigned long start = (unsigned long)memmap;
|
2013-11-12 23:07:43 +00:00
|
|
|
unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
|
2013-04-29 22:07:50 +00:00
|
|
|
|
|
|
|
vmemmap_free(start, end);
|
2008-04-28 09:13:34 +00:00
|
|
|
}
|
2013-04-29 22:08:22 +00:00
|
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
2007-10-16 08:26:14 +00:00
|
|
|
#else
|
2013-11-12 23:07:42 +00:00
|
|
|
static struct page *__kmalloc_section_memmap(void)
|
2005-10-30 01:16:55 +00:00
|
|
|
{
|
|
|
|
struct page *page, *ret;
|
2013-11-12 23:07:42 +00:00
|
|
|
unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
|
2005-10-30 01:16:55 +00:00
|
|
|
|
2006-10-28 17:38:32 +00:00
|
|
|
page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
|
2005-10-30 01:16:55 +00:00
|
|
|
if (page)
|
|
|
|
goto got_map_page;
|
|
|
|
|
|
|
|
ret = vmalloc(memmap_size);
|
|
|
|
if (ret)
|
|
|
|
goto got_map_ptr;
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
got_map_page:
|
|
|
|
ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
|
|
|
|
got_map_ptr:
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-11-12 23:07:42 +00:00
|
|
|
static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid)
|
2007-10-16 08:26:14 +00:00
|
|
|
{
|
2013-11-12 23:07:42 +00:00
|
|
|
return __kmalloc_section_memmap();
|
2007-10-16 08:26:14 +00:00
|
|
|
}
|
|
|
|
|
2013-11-12 23:07:42 +00:00
|
|
|
static void __kfree_section_memmap(struct page *memmap)
|
2005-10-30 01:16:55 +00:00
|
|
|
{
|
2008-02-05 06:28:34 +00:00
|
|
|
if (is_vmalloc_addr(memmap))
|
2005-10-30 01:16:55 +00:00
|
|
|
vfree(memmap);
|
|
|
|
else
|
|
|
|
free_pages((unsigned long)memmap,
|
2013-11-12 23:07:42 +00:00
|
|
|
get_order(sizeof(struct page) * PAGES_PER_SECTION));
|
2005-10-30 01:16:55 +00:00
|
|
|
}
|
2008-04-28 09:13:34 +00:00
|
|
|
|
2013-04-29 22:08:22 +00:00
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
2013-11-12 23:07:43 +00:00
|
|
|
static void free_map_bootmem(struct page *memmap)
|
2008-04-28 09:13:34 +00:00
|
|
|
{
|
|
|
|
unsigned long maps_section_nr, removing_section_nr, i;
|
2013-11-12 23:07:43 +00:00
|
|
|
unsigned long magic, nr_pages;
|
2012-11-29 21:54:21 +00:00
|
|
|
struct page *page = virt_to_page(memmap);
|
2008-04-28 09:13:34 +00:00
|
|
|
|
2013-11-12 23:07:43 +00:00
|
|
|
nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
|
|
|
|
>> PAGE_SHIFT;
|
|
|
|
|
2008-04-28 09:13:34 +00:00
|
|
|
for (i = 0; i < nr_pages; i++, page++) {
|
2017-02-22 23:45:13 +00:00
|
|
|
magic = (unsigned long) page->freelist;
|
2008-04-28 09:13:34 +00:00
|
|
|
|
|
|
|
BUG_ON(magic == NODE_INFO);
|
|
|
|
|
|
|
|
maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
|
2017-02-22 23:45:10 +00:00
|
|
|
removing_section_nr = page_private(page);
|
2008-04-28 09:13:34 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* When this function is called, the removing section is
|
|
|
|
* logical offlined state. This means all pages are isolated
|
|
|
|
* from page allocator. If removing section's memmap is placed
|
|
|
|
* on the same section, it must not be freed.
|
|
|
|
* If it is freed, page allocator may allocate it which will
|
|
|
|
* be removed physically soon.
|
|
|
|
*/
|
|
|
|
if (maps_section_nr != removing_section_nr)
|
|
|
|
put_page_bootmem(page);
|
|
|
|
}
|
|
|
|
}
|
2013-04-29 22:08:22 +00:00
|
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
2007-10-16 08:26:14 +00:00
|
|
|
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|
2005-10-30 01:16:55 +00:00
|
|
|
|
2005-06-23 07:08:00 +00:00
|
|
|
/*
|
|
|
|
* returns the number of sections whose mem_maps were properly
|
|
|
|
* set. If this is <=0, then that means that the passed-in
|
|
|
|
* map was not consumed and must be freed.
|
|
|
|
*/
|
2013-11-12 23:07:42 +00:00
|
|
|
int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
|
2005-06-23 07:08:00 +00:00
|
|
|
{
|
2005-10-30 01:16:55 +00:00
|
|
|
unsigned long section_nr = pfn_to_section_nr(start_pfn);
|
|
|
|
struct pglist_data *pgdat = zone->zone_pgdat;
|
|
|
|
struct mem_section *ms;
|
|
|
|
struct page *memmap;
|
2007-10-16 08:25:56 +00:00
|
|
|
unsigned long *usemap;
|
2005-10-30 01:16:55 +00:00
|
|
|
unsigned long flags;
|
|
|
|
int ret;
|
2005-06-23 07:08:00 +00:00
|
|
|
|
2005-10-30 01:16:55 +00:00
|
|
|
/*
|
|
|
|
* no locking for this, because it does its own
|
|
|
|
* plus, it does a kmalloc
|
|
|
|
*/
|
2007-12-18 00:19:59 +00:00
|
|
|
ret = sparse_index_init(section_nr, pgdat->node_id);
|
|
|
|
if (ret < 0 && ret != -EEXIST)
|
|
|
|
return ret;
|
2013-11-12 23:07:42 +00:00
|
|
|
memmap = kmalloc_section_memmap(section_nr, pgdat->node_id);
|
2007-12-18 00:19:59 +00:00
|
|
|
if (!memmap)
|
|
|
|
return -ENOMEM;
|
2007-10-16 08:25:56 +00:00
|
|
|
usemap = __kmalloc_section_usemap();
|
2007-12-18 00:19:59 +00:00
|
|
|
if (!usemap) {
|
2013-11-12 23:07:42 +00:00
|
|
|
__kfree_section_memmap(memmap);
|
2007-12-18 00:19:59 +00:00
|
|
|
return -ENOMEM;
|
|
|
|
}
|
2005-10-30 01:16:55 +00:00
|
|
|
|
|
|
|
pgdat_resize_lock(pgdat, &flags);
|
2005-06-23 07:08:00 +00:00
|
|
|
|
2005-10-30 01:16:55 +00:00
|
|
|
ms = __pfn_to_section(start_pfn);
|
|
|
|
if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
|
|
|
|
ret = -EEXIST;
|
|
|
|
goto out;
|
|
|
|
}
|
2007-10-16 08:25:56 +00:00
|
|
|
|
2013-11-12 23:07:42 +00:00
|
|
|
memset(memmap, 0, sizeof(struct page) * PAGES_PER_SECTION);
|
2012-12-12 00:00:59 +00:00
|
|
|
|
2005-06-23 07:08:00 +00:00
|
|
|
ms->section_mem_map |= SECTION_MARKED_PRESENT;
|
|
|
|
|
2007-10-16 08:25:56 +00:00
|
|
|
ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
|
2005-10-30 01:16:55 +00:00
|
|
|
|
|
|
|
out:
|
|
|
|
pgdat_resize_unlock(pgdat, &flags);
|
2007-12-18 00:19:59 +00:00
|
|
|
if (ret <= 0) {
|
|
|
|
kfree(usemap);
|
2013-11-12 23:07:42 +00:00
|
|
|
__kfree_section_memmap(memmap);
|
2007-12-18 00:19:59 +00:00
|
|
|
}
|
2005-10-30 01:16:55 +00:00
|
|
|
return ret;
|
2005-06-23 07:08:00 +00:00
|
|
|
}
|
2008-04-28 09:12:01 +00:00
|
|
|
|
2013-07-08 23:00:10 +00:00
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
2012-12-12 00:00:47 +00:00
|
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
|
|
static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!memmap)
|
|
|
|
return;
|
|
|
|
|
2016-01-16 00:56:22 +00:00
|
|
|
for (i = 0; i < nr_pages; i++) {
|
2012-12-12 00:00:47 +00:00
|
|
|
if (PageHWPoison(&memmap[i])) {
|
2013-02-23 00:34:02 +00:00
|
|
|
atomic_long_sub(1, &num_poisoned_pages);
|
2012-12-12 00:00:47 +00:00
|
|
|
ClearPageHWPoison(&memmap[i]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2013-04-29 22:08:22 +00:00
|
|
|
static void free_section_usemap(struct page *memmap, unsigned long *usemap)
|
|
|
|
{
|
|
|
|
struct page *usemap_page;
|
|
|
|
|
|
|
|
if (!usemap)
|
|
|
|
return;
|
|
|
|
|
|
|
|
usemap_page = virt_to_page(usemap);
|
|
|
|
/*
|
|
|
|
* Check to see if allocation came from hot-plug-add
|
|
|
|
*/
|
|
|
|
if (PageSlab(usemap_page) || PageCompound(usemap_page)) {
|
|
|
|
kfree(usemap);
|
|
|
|
if (memmap)
|
2013-11-12 23:07:42 +00:00
|
|
|
__kfree_section_memmap(memmap);
|
2013-04-29 22:08:22 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The usemap came from bootmem. This is packed with other usemaps
|
|
|
|
* on the section which has pgdat at boot time. Just keep it as is now.
|
|
|
|
*/
|
|
|
|
|
2013-11-12 23:07:43 +00:00
|
|
|
if (memmap)
|
|
|
|
free_map_bootmem(memmap);
|
2013-04-29 22:08:22 +00:00
|
|
|
}
|
|
|
|
|
2016-01-16 00:56:22 +00:00
|
|
|
void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
|
|
|
|
unsigned long map_offset)
|
2008-04-28 09:12:01 +00:00
|
|
|
{
|
|
|
|
struct page *memmap = NULL;
|
2013-02-23 00:33:02 +00:00
|
|
|
unsigned long *usemap = NULL, flags;
|
|
|
|
struct pglist_data *pgdat = zone->zone_pgdat;
|
2008-04-28 09:12:01 +00:00
|
|
|
|
2013-02-23 00:33:02 +00:00
|
|
|
pgdat_resize_lock(pgdat, &flags);
|
2008-04-28 09:12:01 +00:00
|
|
|
if (ms->section_mem_map) {
|
|
|
|
usemap = ms->pageblock_flags;
|
|
|
|
memmap = sparse_decode_mem_map(ms->section_mem_map,
|
|
|
|
__section_nr(ms));
|
|
|
|
ms->section_mem_map = 0;
|
|
|
|
ms->pageblock_flags = NULL;
|
|
|
|
}
|
2013-02-23 00:33:02 +00:00
|
|
|
pgdat_resize_unlock(pgdat, &flags);
|
2008-04-28 09:12:01 +00:00
|
|
|
|
2016-01-16 00:56:22 +00:00
|
|
|
clear_hwpoisoned_pages(memmap + map_offset,
|
|
|
|
PAGES_PER_SECTION - map_offset);
|
2008-04-28 09:12:01 +00:00
|
|
|
free_section_usemap(memmap, usemap);
|
|
|
|
}
|
2013-04-29 22:08:22 +00:00
|
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|