memory cgroup enhancements: remember "a page is charged as page cache"
Add a flag to page_cgroup to remember "this page is charged as cache." cache here includes page caches and swap cache. This is useful for implementing precise accounting in memory cgroup. TODO: distinguish page-cache and swap-cache Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Pavel Emelianov <xemul@openvz.org> Cc: Paul Menage <menage@google.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Kirill Korotaev <dev@sw.ru> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: David Rientjes <rientjes@google.com> Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 21 additions and 3 deletions
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@ -83,7 +83,9 @@ struct page_cgroup {
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struct mem_cgroup *mem_cgroup;
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atomic_t ref_cnt; /* Helpful when pages move b/w */
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/* mapped and cached states */
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int flags;
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};
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#define PAGE_CGROUP_FLAG_CACHE (0x1) /* charged as cache */
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enum {
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MEM_CGROUP_TYPE_UNSPEC = 0,
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@ -93,6 +95,11 @@ enum {
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MEM_CGROUP_TYPE_MAX,
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};
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enum charge_type {
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MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
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MEM_CGROUP_CHARGE_TYPE_MAPPED,
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};
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static struct mem_cgroup init_mem_cgroup;
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static inline
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@ -306,8 +313,8 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
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* 0 if the charge was successful
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* < 0 if the cgroup is over its limit
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*/
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int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
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gfp_t gfp_mask)
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static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
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gfp_t gfp_mask, enum charge_type ctype)
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{
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struct mem_cgroup *mem;
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struct page_cgroup *pc;
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@ -409,6 +416,9 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
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atomic_set(&pc->ref_cnt, 1);
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pc->mem_cgroup = mem;
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pc->page = page;
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pc->flags = 0;
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if (ctype == MEM_CGROUP_CHARGE_TYPE_CACHE)
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pc->flags |= PAGE_CGROUP_FLAG_CACHE;
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if (page_cgroup_assign_new_page_cgroup(page, pc)) {
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/*
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* an another charge is added to this page already.
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@ -433,6 +443,13 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
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return -ENOMEM;
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}
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int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
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gfp_t gfp_mask)
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{
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return mem_cgroup_charge_common(page, mm, gfp_mask,
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MEM_CGROUP_CHARGE_TYPE_MAPPED);
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}
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/*
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* See if the cached pages should be charged at all?
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*/
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@ -445,7 +462,8 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
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mem = rcu_dereference(mm->mem_cgroup);
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if (mem->control_type == MEM_CGROUP_TYPE_ALL)
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return mem_cgroup_charge(page, mm, gfp_mask);
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return mem_cgroup_charge_common(page, mm, gfp_mask,
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MEM_CGROUP_CHARGE_TYPE_CACHE);
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else
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return 0;
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}
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