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author | Hugh Dickins <hugh@veritas.com> | 2005-10-29 18:16:40 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-29 21:40:42 -0700 |
commit | 4c21e2f2441dc5fbb957b030333f5a3f2d02dea7 (patch) | |
tree | 1f76d33bb1d76221c6424bc5fed080a4f91349a6 /arch | |
parent | b38c6845b695141259019e2b7c0fe6c32a6e720d (diff) | |
download | kernel_samsung_smdk4412-4c21e2f2441dc5fbb957b030333f5a3f2d02dea7.zip kernel_samsung_smdk4412-4c21e2f2441dc5fbb957b030333f5a3f2d02dea7.tar.gz kernel_samsung_smdk4412-4c21e2f2441dc5fbb957b030333f5a3f2d02dea7.tar.bz2 |
[PATCH] mm: split page table lock
Christoph Lameter demonstrated very poor scalability on the SGI 512-way, with
a many-threaded application which concurrently initializes different parts of
a large anonymous area.
This patch corrects that, by using a separate spinlock per page table page, to
guard the page table entries in that page, instead of using the mm's single
page_table_lock. (But even then, page_table_lock is still used to guard page
table allocation, and anon_vma allocation.)
In this implementation, the spinlock is tucked inside the struct page of the
page table page: with a BUILD_BUG_ON in case it overflows - which it would in
the case of 32-bit PA-RISC with spinlock debugging enabled.
Splitting the lock is not quite for free: another cacheline access. Ideally,
I suppose we would use split ptlock only for multi-threaded processes on
multi-cpu machines; but deciding that dynamically would have its own costs.
So for now enable it by config, at some number of cpus - since the Kconfig
language doesn't support inequalities, let preprocessor compare that with
NR_CPUS. But I don't think it's worth being user-configurable: for good
testing of both split and unsplit configs, split now at 4 cpus, and perhaps
change that to 8 later.
There is a benefit even for singly threaded processes: kswapd can be attacking
one part of the mm while another part is busy faulting.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/mm/mm-armv.c | 1 | ||||
-rw-r--r-- | arch/frv/mm/pgalloc.c | 4 | ||||
-rw-r--r-- | arch/i386/mm/pgtable.c | 8 | ||||
-rw-r--r-- | arch/um/kernel/skas/mmu.c | 1 |
4 files changed, 8 insertions, 6 deletions
diff --git a/arch/arm/mm/mm-armv.c b/arch/arm/mm/mm-armv.c index 60f3e03..1221fdd 100644 --- a/arch/arm/mm/mm-armv.c +++ b/arch/arm/mm/mm-armv.c @@ -229,6 +229,7 @@ void free_pgd_slow(pgd_t *pgd) pte = pmd_page(*pmd); pmd_clear(pmd); dec_page_state(nr_page_table_pages); + pte_lock_deinit(pte); pte_free(pte); pmd_free(pmd); free: diff --git a/arch/frv/mm/pgalloc.c b/arch/frv/mm/pgalloc.c index 4eaec0f..2c67dfe 100644 --- a/arch/frv/mm/pgalloc.c +++ b/arch/frv/mm/pgalloc.c @@ -87,14 +87,14 @@ static inline void pgd_list_add(pgd_t *pgd) if (pgd_list) pgd_list->private = (unsigned long) &page->index; pgd_list = page; - page->private = (unsigned long) &pgd_list; + set_page_private(page, (unsigned long)&pgd_list); } static inline void pgd_list_del(pgd_t *pgd) { struct page *next, **pprev, *page = virt_to_page(pgd); next = (struct page *) page->index; - pprev = (struct page **) page->private; + pprev = (struct page **)page_private(page); *pprev = next; if (next) next->private = (unsigned long) pprev; diff --git a/arch/i386/mm/pgtable.c b/arch/i386/mm/pgtable.c index dcdce2c..39c099f 100644 --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -188,19 +188,19 @@ static inline void pgd_list_add(pgd_t *pgd) struct page *page = virt_to_page(pgd); page->index = (unsigned long)pgd_list; if (pgd_list) - pgd_list->private = (unsigned long)&page->index; + set_page_private(pgd_list, (unsigned long)&page->index); pgd_list = page; - page->private = (unsigned long)&pgd_list; + set_page_private(page, (unsigned long)&pgd_list); } static inline void pgd_list_del(pgd_t *pgd) { struct page *next, **pprev, *page = virt_to_page(pgd); next = (struct page *)page->index; - pprev = (struct page **)page->private; + pprev = (struct page **)page_private(page); *pprev = next; if (next) - next->private = (unsigned long)pprev; + set_page_private(next, (unsigned long)pprev); } void pgd_ctor(void *pgd, kmem_cache_t *cache, unsigned long unused) diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c index 02cf36e..9e5e39c 100644 --- a/arch/um/kernel/skas/mmu.c +++ b/arch/um/kernel/skas/mmu.c @@ -144,6 +144,7 @@ void destroy_context_skas(struct mm_struct *mm) if(!proc_mm || !ptrace_faultinfo){ free_page(mmu->id.stack); + pte_lock_deinit(virt_to_page(mmu->last_page_table)); pte_free_kernel((pte_t *) mmu->last_page_table); dec_page_state(nr_page_table_pages); #ifdef CONFIG_3_LEVEL_PGTABLES |