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mm: introduce PageHuge() for testing huge/gigantic pages
A series of patches to enhance the /proc/pagemap interface and to add a
userspace executable which can be used to present the pagemap data.
Export 10 more flags to end users (and more for kernel developers):
11. KPF_MMAP (pseudo flag) memory mapped page
12. KPF_ANON (pseudo flag) memory mapped page (anonymous)
13. KPF_SWAPCACHE page is in swap cache
14. KPF_SWAPBACKED page is swap/RAM backed
15. KPF_COMPOUND_HEAD (*)
16. KPF_COMPOUND_TAIL (*)
17. KPF_HUGE hugeTLB pages
18. KPF_UNEVICTABLE page is in the unevictable LRU list
19. KPF_HWPOISON hardware detected corruption
20. KPF_NOPAGE (pseudo flag) no page frame at the address
(*) For compound pages, exporting _both_ head/tail info enables
users to tell where a compound page starts/ends, and its order.
a simple demo of the page-types tool
# ./page-types -h
page-types [options]
-r|--raw Raw mode, for kernel developers
-a|--addr addr-spec Walk a range of pages
-b|--bits bits-spec Walk pages with specified bits
-l|--list Show page details in ranges
-L|--list-each Show page details one by one
-N|--no-summary Don't show summay info
-h|--help Show this usage message
addr-spec:
N one page at offset N (unit: pages)
N+M pages range from N to N+M-1
N,M pages range from N to M-1
N, pages range from N to end
,M pages range from 0 to M
bits-spec:
bit1,bit2 (flags & (bit1|bit2)) != 0
bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1
bit1,~bit2 (flags & (bit1|bit2)) == bit1
=bit1,bit2 flags == (bit1|bit2)
bit-names:
locked error referenced uptodate
dirty lru active slab
writeback reclaim buddy mmap
anonymous swapcache swapbacked compound_head
compound_tail huge unevictable hwpoison
nopage reserved(r) mlocked(r) mappedtodisk(r)
private(r) private_2(r) owner_private(r) arch(r)
uncached(r) readahead(o) slob_free(o) slub_frozen(o)
slub_debug(o)
(r) raw mode bits (o) overloaded bits
# ./page-types
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000000 487369 1903 _________________________________
0x0000000000000014 5 0 __R_D____________________________ referenced,dirty
0x0000000000000020 1 0 _____l___________________________ lru
0x0000000000000024 34 0 __R__l___________________________ referenced,lru
0x0000000000000028 3838 14 ___U_l___________________________ uptodate,lru
0x0001000000000028 48 0 ___U_l_______________________I___ uptodate,lru,readahead
0x000000000000002c 6478 25 __RU_l___________________________ referenced,uptodate,lru
0x000100000000002c 47 0 __RU_l_______________________I___ referenced,uptodate,lru,readahead
0x0000000000000040 8344 32 ______A__________________________ active
0x0000000000000060 1 0 _____lA__________________________ lru,active
0x0000000000000068 348 1 ___U_lA__________________________ uptodate,lru,active
0x0001000000000068 12 0 ___U_lA______________________I___ uptodate,lru,active,readahead
0x000000000000006c 988 3 __RU_lA__________________________ referenced,uptodate,lru,active
0x000100000000006c 48 0 __RU_lA______________________I___ referenced,uptodate,lru,active,readahead
0x0000000000004078 1 0 ___UDlA_______b__________________ uptodate,dirty,lru,active,swapbacked
0x000000000000407c 34 0 __RUDlA_______b__________________ referenced,uptodate,dirty,lru,active,swapbacked
0x0000000000000400 503 1 __________B______________________ buddy
0x0000000000000804 1 0 __R________M_____________________ referenced,mmap
0x0000000000000828 1029 4 ___U_l_____M_____________________ uptodate,lru,mmap
0x0001000000000828 43 0 ___U_l_____M_________________I___ uptodate,lru,mmap,readahead
0x000000000000082c 382 1 __RU_l_____M_____________________ referenced,uptodate,lru,mmap
0x000100000000082c 12 0 __RU_l_____M_________________I___ referenced,uptodate,lru,mmap,readahead
0x0000000000000868 192 0 ___U_lA____M_____________________ uptodate,lru,active,mmap
0x0001000000000868 12 0 ___U_lA____M_________________I___ uptodate,lru,active,mmap,readahead
0x000000000000086c 800 3 __RU_lA____M_____________________ referenced,uptodate,lru,active,mmap
0x000100000000086c 31 0 __RU_lA____M_________________I___ referenced,uptodate,lru,active,mmap,readahead
0x0000000000004878 2 0 ___UDlA____M__b__________________ uptodate,dirty,lru,active,mmap,swapbacked
0x0000000000001000 492 1 ____________a____________________ anonymous
0x0000000000005808 4 0 ___U_______Ma_b__________________ uptodate,mmap,anonymous,swapbacked
0x0000000000005868 2839 11 ___U_lA____Ma_b__________________ uptodate,lru,active,mmap,anonymous,swapbacked
0x000000000000586c 30 0 __RU_lA____Ma_b__________________ referenced,uptodate,lru,active,mmap,anonymous,swapbacked
total 513968 2007
# ./page-types -r
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000000 468002 1828 _________________________________
0x0000000100000000 19102 74 _____________________r___________ reserved
0x0000000000008000 41 0 _______________H_________________ compound_head
0x0000000000010000 188 0 ________________T________________ compound_tail
0x0000000000008014 1 0 __R_D__________H_________________ referenced,dirty,compound_head
0x0000000000010014 4 0 __R_D___________T________________ referenced,dirty,compound_tail
0x0000000000000020 1 0 _____l___________________________ lru
0x0000000800000024 34 0 __R__l__________________P________ referenced,lru,private
0x0000000000000028 3794 14 ___U_l___________________________ uptodate,lru
0x0001000000000028 46 0 ___U_l_______________________I___ uptodate,lru,readahead
0x0000000400000028 44 0 ___U_l_________________d_________ uptodate,lru,mappedtodisk
0x0001000400000028 2 0 ___U_l_________________d_____I___ uptodate,lru,mappedtodisk,readahead
0x000000000000002c 6434 25 __RU_l___________________________ referenced,uptodate,lru
0x000100000000002c 47 0 __RU_l_______________________I___ referenced,uptodate,lru,readahead
0x000000040000002c 14 0 __RU_l_________________d_________ referenced,uptodate,lru,mappedtodisk
0x000000080000002c 30 0 __RU_l__________________P________ referenced,uptodate,lru,private
0x0000000800000040 8124 31 ______A_________________P________ active,private
0x0000000000000040 219 0 ______A__________________________ active
0x0000000800000060 1 0 _____lA_________________P________ lru,active,private
0x0000000000000068 322 1 ___U_lA__________________________ uptodate,lru,active
0x0001000000000068 12 0 ___U_lA______________________I___ uptodate,lru,active,readahead
0x0000000400000068 13 0 ___U_lA________________d_________ uptodate,lru,active,mappedtodisk
0x0000000800000068 12 0 ___U_lA_________________P________ uptodate,lru,active,private
0x000000000000006c 977 3 __RU_lA__________________________ referenced,uptodate,lru,active
0x000100000000006c 48 0 __RU_lA______________________I___ referenced,uptodate,lru,active,readahead
0x000000040000006c 5 0 __RU_lA________________d_________ referenced,uptodate,lru,active,mappedtodisk
0x000000080000006c 3 0 __RU_lA_________________P________ referenced,uptodate,lru,active,private
0x0000000c0000006c 3 0 __RU_lA________________dP________ referenced,uptodate,lru,active,mappedtodisk,private
0x0000000c00000068 1 0 ___U_lA________________dP________ uptodate,lru,active,mappedtodisk,private
0x0000000000004078 1 0 ___UDlA_______b__________________ uptodate,dirty,lru,active,swapbacked
0x000000000000407c 34 0 __RUDlA_______b__________________ referenced,uptodate,dirty,lru,active,swapbacked
0x0000000000000400 538 2 __________B______________________ buddy
0x0000000000000804 1 0 __R________M_____________________ referenced,mmap
0x0000000000000828 1029 4 ___U_l_____M_____________________ uptodate,lru,mmap
0x0001000000000828 43 0 ___U_l_____M_________________I___ uptodate,lru,mmap,readahead
0x000000000000082c 382 1 __RU_l_____M_____________________ referenced,uptodate,lru,mmap
0x000100000000082c 12 0 __RU_l_____M_________________I___ referenced,uptodate,lru,mmap,readahead
0x0000000000000868 192 0 ___U_lA____M_____________________ uptodate,lru,active,mmap
0x0001000000000868 12 0 ___U_lA____M_________________I___ uptodate,lru,active,mmap,readahead
0x000000000000086c 800 3 __RU_lA____M_____________________ referenced,uptodate,lru,active,mmap
0x000100000000086c 31 0 __RU_lA____M_________________I___ referenced,uptodate,lru,active,mmap,readahead
0x0000000000004878 2 0 ___UDlA____M__b__________________ uptodate,dirty,lru,active,mmap,swapbacked
0x0000000000001000 492 1 ____________a____________________ anonymous
0x0000000000005008 2 0 ___U________a_b__________________ uptodate,anonymous,swapbacked
0x0000000000005808 4 0 ___U_______Ma_b__________________ uptodate,mmap,anonymous,swapbacked
0x000000000000580c 1 0 __RU_______Ma_b__________________ referenced,uptodate,mmap,anonymous,swapbacked
0x0000000000005868 2839 11 ___U_lA____Ma_b__________________ uptodate,lru,active,mmap,anonymous,swapbacked
0x000000000000586c 29 0 __RU_lA____Ma_b__________________ referenced,uptodate,lru,active,mmap,anonymous,swapbacked
total 513968 2007
# ./page-types --raw --list --no-summary --bits reserved
offset count flags
0 15 _____________________r___________
31 4 _____________________r___________
159 97 _____________________r___________
4096 2067 _____________________r___________
6752 2390 _____________________r___________
9355 3 _____________________r___________
9728 14526 _____________________r___________
This patch:
Introduce PageHuge(), which identifies huge/gigantic pages by their
dedicated compound destructor functions.
Also move prep_compound_gigantic_page() to hugetlb.c and make
__free_pages_ok() non-static.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wu Fengguang
Linus Torvalds
parent
a1dd268cf6
commit
20a0307c03
@ -6,6 +6,7 @@
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#include <linux/mmzone.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/hugetlb.h>
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#include <asm/uaccess.h>
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#include "internal.h"
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@ -11,6 +11,8 @@
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struct ctl_table;
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int PageHuge(struct page *page);
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static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
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{
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return vma->vm_flags & VM_HUGETLB;
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@ -61,6 +63,11 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
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#else /* !CONFIG_HUGETLB_PAGE */
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static inline int PageHuge(struct page *page)
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{
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return 0;
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}
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static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
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{
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return 0;
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98
mm/hugetlb.c
98
mm/hugetlb.c
@ -578,41 +578,6 @@ static void free_huge_page(struct page *page)
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hugetlb_put_quota(mapping, 1);
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}
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/*
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* Increment or decrement surplus_huge_pages. Keep node-specific counters
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* balanced by operating on them in a round-robin fashion.
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* Returns 1 if an adjustment was made.
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*/
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static int adjust_pool_surplus(struct hstate *h, int delta)
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{
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static int prev_nid;
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int nid = prev_nid;
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int ret = 0;
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VM_BUG_ON(delta != -1 && delta != 1);
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do {
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nid = next_node(nid, node_online_map);
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if (nid == MAX_NUMNODES)
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nid = first_node(node_online_map);
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/* To shrink on this node, there must be a surplus page */
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if (delta < 0 && !h->surplus_huge_pages_node[nid])
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continue;
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/* Surplus cannot exceed the total number of pages */
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if (delta > 0 && h->surplus_huge_pages_node[nid] >=
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h->nr_huge_pages_node[nid])
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continue;
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h->surplus_huge_pages += delta;
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h->surplus_huge_pages_node[nid] += delta;
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ret = 1;
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break;
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} while (nid != prev_nid);
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prev_nid = nid;
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return ret;
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}
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static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
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{
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set_compound_page_dtor(page, free_huge_page);
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@ -623,6 +588,34 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
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put_page(page); /* free it into the hugepage allocator */
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}
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static void prep_compound_gigantic_page(struct page *page, unsigned long order)
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{
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int i;
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int nr_pages = 1 << order;
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struct page *p = page + 1;
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/* we rely on prep_new_huge_page to set the destructor */
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set_compound_order(page, order);
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__SetPageHead(page);
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for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
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__SetPageTail(p);
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p->first_page = page;
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}
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}
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int PageHuge(struct page *page)
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{
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compound_page_dtor *dtor;
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if (!PageCompound(page))
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return 0;
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page = compound_head(page);
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dtor = get_compound_page_dtor(page);
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return dtor == free_huge_page;
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}
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static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
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{
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struct page *page;
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@ -1140,6 +1133,41 @@ static inline void try_to_free_low(struct hstate *h, unsigned long count)
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}
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#endif
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/*
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* Increment or decrement surplus_huge_pages. Keep node-specific counters
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* balanced by operating on them in a round-robin fashion.
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* Returns 1 if an adjustment was made.
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*/
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static int adjust_pool_surplus(struct hstate *h, int delta)
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{
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static int prev_nid;
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int nid = prev_nid;
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int ret = 0;
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VM_BUG_ON(delta != -1 && delta != 1);
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do {
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nid = next_node(nid, node_online_map);
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if (nid == MAX_NUMNODES)
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nid = first_node(node_online_map);
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/* To shrink on this node, there must be a surplus page */
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if (delta < 0 && !h->surplus_huge_pages_node[nid])
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continue;
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/* Surplus cannot exceed the total number of pages */
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if (delta > 0 && h->surplus_huge_pages_node[nid] >=
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h->nr_huge_pages_node[nid])
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continue;
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h->surplus_huge_pages += delta;
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h->surplus_huge_pages_node[nid] += delta;
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ret = 1;
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break;
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} while (nid != prev_nid);
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prev_nid = nid;
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return ret;
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}
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#define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages)
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static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count)
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{
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@ -16,9 +16,6 @@
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void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
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unsigned long floor, unsigned long ceiling);
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extern void prep_compound_page(struct page *page, unsigned long order);
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extern void prep_compound_gigantic_page(struct page *page, unsigned long order);
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static inline void set_page_count(struct page *page, int v)
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{
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atomic_set(&page->_count, v);
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@ -51,6 +48,8 @@ extern void putback_lru_page(struct page *page);
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*/
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extern unsigned long highest_memmap_pfn;
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extern void __free_pages_bootmem(struct page *page, unsigned int order);
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extern void prep_compound_page(struct page *page, unsigned long order);
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/*
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* function for dealing with page's order in buddy system.
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@ -300,23 +300,6 @@ void prep_compound_page(struct page *page, unsigned long order)
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}
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}
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#ifdef CONFIG_HUGETLBFS
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void prep_compound_gigantic_page(struct page *page, unsigned long order)
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{
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int i;
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int nr_pages = 1 << order;
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struct page *p = page + 1;
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set_compound_page_dtor(page, free_compound_page);
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set_compound_order(page, order);
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__SetPageHead(page);
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for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
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__SetPageTail(p);
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p->first_page = page;
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}
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}
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#endif
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static int destroy_compound_page(struct page *page, unsigned long order)
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{
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int i;
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