x86_64: Quicklist support for x86_64

This adds caching of pgds and puds, pmds, pte.  That way we can avoid costly
zeroing and initialization of special mappings in the pgd.

A second quicklist is useful to separate out PGD handling.  We can carry the
initialized pgds over to the next process needing them.

Also clean up the pgd_list handling to use regular list macros.  There is no
need anymore to avoid the lru field.

Move the add/removal of the pgds to the pgdlist into the constructor /
destructor.  That way the implementation is congruent with i386.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Acked-by: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-07-21 17:10:30 +02:00 committed by Linus Torvalds
parent f0a7a5c93d
commit 34feb2c83b
5 changed files with 59 additions and 26 deletions

View File

@ -60,6 +60,14 @@ config ZONE_DMA
bool
default y
config QUICKLIST
bool
default y
config NR_QUICK
int
default 2
config ISA
bool

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@ -207,6 +207,7 @@ void cpu_idle (void)
if (__get_cpu_var(cpu_idle_state))
__get_cpu_var(cpu_idle_state) = 0;
check_pgt_cache();
rmb();
idle = pm_idle;
if (!idle)

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@ -241,7 +241,7 @@ void flush_tlb_mm (struct mm_struct * mm)
}
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, FLUSH_ALL);
check_pgt_cache();
preempt_enable();
}
EXPORT_SYMBOL(flush_tlb_mm);

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@ -4,6 +4,10 @@
#include <asm/pda.h>
#include <linux/threads.h>
#include <linux/mm.h>
#include <linux/quicklist.h>
#define QUICK_PGD 0 /* We preserve special mappings over free */
#define QUICK_PT 1 /* Other page table pages that are zero on free */
#define pmd_populate_kernel(mm, pmd, pte) \
set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
@ -20,23 +24,23 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *p
static inline void pmd_free(pmd_t *pmd)
{
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
free_page((unsigned long)pmd);
quicklist_free(QUICK_PT, NULL, pmd);
}
static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
{
return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
return (pmd_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
}
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
return (pud_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
}
static inline void pud_free (pud_t *pud)
{
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
free_page((unsigned long)pud);
quicklist_free(QUICK_PT, NULL, pud);
}
static inline void pgd_list_add(pgd_t *pgd)
@ -57,41 +61,57 @@ static inline void pgd_list_del(pgd_t *pgd)
spin_unlock(&pgd_lock);
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
static inline void pgd_ctor(void *x)
{
unsigned boundary;
pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
if (!pgd)
return NULL;
pgd_list_add(pgd);
pgd_t *pgd = x;
struct page *page = virt_to_page(pgd);
/*
* Copy kernel pointers in from init.
* Could keep a freelist or slab cache of those because the kernel
* part never changes.
*/
boundary = pgd_index(__PAGE_OFFSET);
memset(pgd, 0, boundary * sizeof(pgd_t));
memcpy(pgd + boundary,
init_level4_pgt + boundary,
(PTRS_PER_PGD - boundary) * sizeof(pgd_t));
init_level4_pgt + boundary,
(PTRS_PER_PGD - boundary) * sizeof(pgd_t));
spin_lock(&pgd_lock);
list_add(&page->lru, &pgd_list);
spin_unlock(&pgd_lock);
}
static inline void pgd_dtor(void *x)
{
pgd_t *pgd = x;
struct page *page = virt_to_page(pgd);
spin_lock(&pgd_lock);
list_del(&page->lru);
spin_unlock(&pgd_lock);
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *pgd = (pgd_t *)quicklist_alloc(QUICK_PGD,
GFP_KERNEL|__GFP_REPEAT, pgd_ctor);
return pgd;
}
static inline void pgd_free(pgd_t *pgd)
{
BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
pgd_list_del(pgd);
free_page((unsigned long)pgd);
quicklist_free(QUICK_PGD, pgd_dtor, pgd);
}
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
return (pte_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
}
static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
void *p = (void *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
if (!p)
return NULL;
return virt_to_page(p);
@ -103,17 +123,22 @@ static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long add
static inline void pte_free_kernel(pte_t *pte)
{
BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
free_page((unsigned long)pte);
quicklist_free(QUICK_PT, NULL, pte);
}
static inline void pte_free(struct page *pte)
{
__free_page(pte);
}
quicklist_free_page(QUICK_PT, NULL, pte);
}
#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
#define __pte_free_tlb(tlb,pte) quicklist_free_page(QUICK_PT, NULL,(pte))
#define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
#define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
#define __pmd_free_tlb(tlb,x) quicklist_free(QUICK_PT, NULL, (x))
#define __pud_free_tlb(tlb,x) quicklist_free(QUICK_PT, NULL, (x))
static inline void check_pgt_cache(void)
{
quicklist_trim(QUICK_PGD, pgd_dtor, 25, 16);
quicklist_trim(QUICK_PT, NULL, 25, 16);
}
#endif /* _X86_64_PGALLOC_H */

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@ -409,7 +409,6 @@ extern int kern_addr_valid(unsigned long addr);
#define HAVE_ARCH_UNMAPPED_AREA
#define pgtable_cache_init() do { } while (0)
#define check_pgt_cache() do { } while (0)
#define PAGE_AGP PAGE_KERNEL_NOCACHE
#define HAVE_PAGE_AGP 1