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mm: remove quicklist page table caches

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Patch series "mm: remove quicklist page table caches".

A while ago Nicholas proposed to remove quicklist page table caches [1].

I've rebased his patch on the curren upstream and switched ia64 and sh to
use generic versions of PTE allocation.

[1] https://lore.kernel.org/linux-mm/20190711030339.20892-1-npiggin@gmail.com

This patch (of 3):

Remove page table allocator "quicklists".  These have been around for a
long time, but have not got much traction in the last decade and are only
used on ia64 and sh architectures.

The numbers in the initial commit look interesting but probably don't
apply anymore.  If anybody wants to resurrect this it's in the git
history, but it's unhelpful to have this code and divergent allocator
behaviour for minor archs.

Also it might be better to instead make more general improvements to page
allocator if this is still so slow.

Link: http://lkml.kernel.org/r/1565250728-21721-2-git-send-email-rppt@linux.ibm.com
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nicholas Piggin
2019-09-23 15:35:19 -07:00
committed by Linus Torvalds
부모 7b167b6810
커밋 13224794cb
39개의 변경된 파일과 25개의 추가작업 그리고 395개의 파일을 삭제
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22
arch/sh/include/asm/pgalloc.h
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@@ -2,11 +2,8 @@
#ifndef __ASM_SH_PGALLOC_H
#define __ASM_SH_PGALLOC_H
#include <linux/quicklist.h>
#include <asm/page.h>
#define QUICK_PT 0 /* Other page table pages that are zero on free */
extern pgd_t *pgd_alloc(struct mm_struct *);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
@@ -34,20 +31,18 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
*/
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
{
return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
}
static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
{
struct page *page;
void *pg;
pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
if (!pg)
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page)
return NULL;
page = virt_to_page(pg);
if (!pgtable_page_ctor(page)) {
quicklist_free(QUICK_PT, NULL, pg);
__free_page(page);
return NULL;
}
return page;
@@ -55,13 +50,13 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
quicklist_free(QUICK_PT, NULL, pte);
free_page((unsigned long)pte);
}
static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
{
pgtable_page_dtor(pte);
quicklist_free_page(QUICK_PT, NULL, pte);
__free_page(pte);
}
#define __pte_free_tlb(tlb,pte,addr) \
@@ -79,9 +74,4 @@ do { \
} while (0);
#endif
static inline void check_pgt_cache(void)
{
quicklist_trim(QUICK_PT, NULL, 25, 16);
}
#endif /* __ASM_SH_PGALLOC_H */