From mboxrd@z Thu Jan 1 00:00:00 1970 From: Balbir Singh Subject: [-mm PATCH 9/9] Memory controller make page_referenced() container aware (v6) Date: Fri, 17 Aug 2007 14:14:01 +0530 Message-ID: <20070817084401.26003.81111.sendpatchset@balbir-laptop> References: <20070817084228.26003.12568.sendpatchset@balbir-laptop> Return-path: In-Reply-To: <20070817084228.26003.12568.sendpatchset@balbir-laptop> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Andrew Morton Cc: Nick Piggin , Peter Zijlstra , Dhaval Giani , YAMAMOTO Takashi , Balbir Singh , Linux Kernel Mailing List , Linux MM Mailing List , Eric W Biederman , Linux Containers , Paul Menage , Pavel Emelianov List-Id: containers.vger.kernel.org Make page_referenced() container aware. Without this patch, page_referenced() can cause a page to be skipped while reclaiming pages. This patch ensures that other containers do not hold pages in a particular container hostage. It is required to ensure that shared pages are freed from a container when they are not actively referenced from the container that brought them in Signed-off-by: --- include/linux/memcontrol.h | 6 ++++++ include/linux/rmap.h | 5 +++-- mm/memcontrol.c | 5 +++++ mm/rmap.c | 30 ++++++++++++++++++++++++------ mm/vmscan.c | 4 ++-- 5 files changed, 40 insertions(+), 10 deletions(-) diff -puN include/linux/rmap.h~mem-control-per-container-page-referenced include/linux/rmap.h --- linux-2.6.23-rc2-mm2/include/linux/rmap.h~mem-control-per-container-page-referenced 2007-08-17 13:14:20.000000000 +0530 +++ linux-2.6.23-rc2-mm2-balbir/include/linux/rmap.h 2007-08-17 13:14:20.000000000 +0530 @@ -8,6 +8,7 @@ #include #include #include +#include /* * The anon_vma heads a list of private "related" vmas, to scan if @@ -86,7 +87,7 @@ static inline void page_dup_rmap(struct /* * Called from mm/vmscan.c to handle paging out */ -int page_referenced(struct page *, int is_locked); +int page_referenced(struct page *, int is_locked, struct mem_container *cnt); int try_to_unmap(struct page *, int ignore_refs); /* @@ -114,7 +115,7 @@ int page_mkclean(struct page *); #define anon_vma_prepare(vma) (0) #define anon_vma_link(vma) do {} while (0) -#define page_referenced(page,l) TestClearPageReferenced(page) +#define page_referenced(page,l,cnt) TestClearPageReferenced(page) #define try_to_unmap(page, refs) SWAP_FAIL static inline int page_mkclean(struct page *page) diff -puN mm/rmap.c~mem-control-per-container-page-referenced mm/rmap.c --- linux-2.6.23-rc2-mm2/mm/rmap.c~mem-control-per-container-page-referenced 2007-08-17 13:14:20.000000000 +0530 +++ linux-2.6.23-rc2-mm2-balbir/mm/rmap.c 2007-08-17 13:14:20.000000000 +0530 @@ -299,7 +299,8 @@ out: return referenced; } -static int page_referenced_anon(struct page *page) +static int page_referenced_anon(struct page *page, + struct mem_container *mem_cont) { unsigned int mapcount; struct anon_vma *anon_vma; @@ -312,6 +313,13 @@ static int page_referenced_anon(struct p mapcount = page_mapcount(page); list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + /* + * If we are reclaiming on behalf of a container, skip + * counting on behalf of references from different + * containers + */ + if (mem_cont && (mm_container(vma->vm_mm) != mem_cont)) + continue; referenced += page_referenced_one(page, vma, &mapcount); if (!mapcount) break; @@ -332,7 +340,8 @@ static int page_referenced_anon(struct p * * This function is only called from page_referenced for object-based pages. */ -static int page_referenced_file(struct page *page) +static int page_referenced_file(struct page *page, + struct mem_container *mem_cont) { unsigned int mapcount; struct address_space *mapping = page->mapping; @@ -365,6 +374,13 @@ static int page_referenced_file(struct p mapcount = page_mapcount(page); vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) { + /* + * If we are reclaiming on behalf of a container, skip + * counting on behalf of references from different + * containers + */ + if (mem_cont && (mm_container(vma->vm_mm) != mem_cont)) + continue; if ((vma->vm_flags & (VM_LOCKED|VM_MAYSHARE)) == (VM_LOCKED|VM_MAYSHARE)) { referenced++; @@ -387,7 +403,8 @@ static int page_referenced_file(struct p * Quick test_and_clear_referenced for all mappings to a page, * returns the number of ptes which referenced the page. */ -int page_referenced(struct page *page, int is_locked) +int page_referenced(struct page *page, int is_locked, + struct mem_container *mem_cont) { int referenced = 0; @@ -399,14 +416,15 @@ int page_referenced(struct page *page, i if (page_mapped(page) && page->mapping) { if (PageAnon(page)) - referenced += page_referenced_anon(page); + referenced += page_referenced_anon(page, mem_cont); else if (is_locked) - referenced += page_referenced_file(page); + referenced += page_referenced_file(page, mem_cont); else if (TestSetPageLocked(page)) referenced++; else { if (page->mapping) - referenced += page_referenced_file(page); + referenced += + page_referenced_file(page, mem_cont); unlock_page(page); } } diff -puN mm/vmscan.c~mem-control-per-container-page-referenced mm/vmscan.c --- linux-2.6.23-rc2-mm2/mm/vmscan.c~mem-control-per-container-page-referenced 2007-08-17 13:14:20.000000000 +0530 +++ linux-2.6.23-rc2-mm2-balbir/mm/vmscan.c 2007-08-17 13:14:20.000000000 +0530 @@ -511,7 +511,7 @@ static unsigned long shrink_page_list(st goto keep_locked; } - referenced = page_referenced(page, 1); + referenced = page_referenced(page, 1, sc->mem_container); /* In active use or really unfreeable? Activate it. */ if (sc->order <= PAGE_ALLOC_COSTLY_ORDER && referenced && page_mapping_inuse(page)) @@ -1065,7 +1065,7 @@ force_reclaim_mapped: if (page_mapped(page)) { if (!reclaim_mapped || (total_swap_pages == 0 && PageAnon(page)) || - page_referenced(page, 0)) { + page_referenced(page, 0, sc->mem_container)) { list_add(&page->lru, &l_active); continue; } diff -puN include/linux/memcontrol.h~mem-control-per-container-page-referenced include/linux/memcontrol.h --- linux-2.6.23-rc2-mm2/include/linux/memcontrol.h~mem-control-per-container-page-referenced 2007-08-17 13:14:20.000000000 +0530 +++ linux-2.6.23-rc2-mm2-balbir/include/linux/memcontrol.h 2007-08-17 13:14:20.000000000 +0530 @@ -43,6 +43,7 @@ extern unsigned long mem_container_isola int active); extern void mem_container_out_of_memory(struct mem_container *mem); extern int mem_container_cache_charge(struct page *page, struct mm_struct *mm); +extern struct mem_container *mm_container(struct mm_struct *mm); static inline void mem_container_uncharge_page(struct page *page) { @@ -93,6 +94,11 @@ static inline int mem_container_cache_ch return 0; } +static inline struct mem_container *mm_container(struct mm_struct *mm) +{ + return NULL; +} + #endif /* CONFIG_CONTAINER_MEM_CONT */ #endif /* _LINUX_MEMCONTROL_H */ diff -puN mm/memcontrol.c~mem-control-per-container-page-referenced mm/memcontrol.c --- linux-2.6.23-rc2-mm2/mm/memcontrol.c~mem-control-per-container-page-referenced 2007-08-17 13:14:20.000000000 +0530 +++ linux-2.6.23-rc2-mm2-balbir/mm/memcontrol.c 2007-08-17 13:14:20.000000000 +0530 @@ -109,6 +109,11 @@ struct mem_container *mem_container_from struct mem_container, css); } +inline struct mem_container *mm_container(struct mm_struct *mm) +{ + return rcu_dereference(mm->mem_container); +} + void mm_init_container(struct mm_struct *mm, struct task_struct *p) { struct mem_container *mem; _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL