From 8a9f3ccd24741b50200c3f33d62534c7271f3dfc Mon Sep 17 00:00:00 2001 From: Balbir Singh Date: Thu, 7 Feb 2008 00:13:53 -0800 Subject: Memory controller: memory accounting Add the accounting hooks. The accounting is carried out for RSS and Page Cache (unmapped) pages. There is now a common limit and accounting for both. The RSS accounting is accounted at page_add_*_rmap() and page_remove_rmap() time. Page cache is accounted at add_to_page_cache(), __delete_from_page_cache(). Swap cache is also accounted for. Each page's page_cgroup is protected with the last bit of the page_cgroup pointer, this makes handling of race conditions involving simultaneous mappings of a page easier. A reference count is kept in the page_cgroup to deal with cases where a page might be unmapped from the RSS of all tasks, but still lives in the page cache. Credits go to Vaidyanathan Srinivasan for helping with reference counting work of the page cgroup. Almost all of the page cache accounting code has help from Vaidyanathan Srinivasan. [hugh@veritas.com: fix swapoff breakage] [akpm@linux-foundation.org: fix locking] Signed-off-by: Vaidyanathan Srinivasan Signed-off-by: Balbir Singh Cc: Pavel Emelianov Cc: Paul Menage Cc: Peter Zijlstra Cc: "Eric W. Biederman" Cc: Nick Piggin Cc: Kirill Korotaev Cc: Herbert Poetzl Cc: David Rientjes Cc: Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory.c | 47 ++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 42 insertions(+), 5 deletions(-) (limited to 'mm/memory.c') diff --git a/mm/memory.c b/mm/memory.c index 9d073fa0a2d0..0ba224ea6ba4 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -50,6 +50,7 @@ #include #include #include +#include #include #include @@ -1144,16 +1145,20 @@ static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *pa { int retval; pte_t *pte; - spinlock_t *ptl; + spinlock_t *ptl; + + retval = mem_cgroup_charge(page, mm); + if (retval) + goto out; retval = -EINVAL; if (PageAnon(page)) - goto out; + goto out_uncharge; retval = -ENOMEM; flush_dcache_page(page); pte = get_locked_pte(mm, addr, &ptl); if (!pte) - goto out; + goto out_uncharge; retval = -EBUSY; if (!pte_none(*pte)) goto out_unlock; @@ -1165,8 +1170,12 @@ static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *pa set_pte_at(mm, addr, pte, mk_pte(page, prot)); retval = 0; + pte_unmap_unlock(pte, ptl); + return retval; out_unlock: pte_unmap_unlock(pte, ptl); +out_uncharge: + mem_cgroup_uncharge_page(page); out: return retval; } @@ -1641,6 +1650,9 @@ gotten: cow_user_page(new_page, old_page, address, vma); __SetPageUptodate(new_page); + if (mem_cgroup_charge(new_page, mm)) + goto oom_free_new; + /* * Re-check the pte - we dropped the lock */ @@ -1672,7 +1684,9 @@ gotten: /* Free the old page.. */ new_page = old_page; ret |= VM_FAULT_WRITE; - } + } else + mem_cgroup_uncharge_page(new_page); + if (new_page) page_cache_release(new_page); if (old_page) @@ -1696,6 +1710,8 @@ unlock: put_page(dirty_page); } return ret; +oom_free_new: + __free_page(new_page); oom: if (old_page) page_cache_release(old_page); @@ -2036,6 +2052,12 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, count_vm_event(PGMAJFAULT); } + if (mem_cgroup_charge(page, mm)) { + delayacct_clear_flag(DELAYACCT_PF_SWAPIN); + ret = VM_FAULT_OOM; + goto out; + } + mark_page_accessed(page); lock_page(page); delayacct_clear_flag(DELAYACCT_PF_SWAPIN); @@ -2073,8 +2095,10 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, if (write_access) { /* XXX: We could OR the do_wp_page code with this one? */ if (do_wp_page(mm, vma, address, - page_table, pmd, ptl, pte) & VM_FAULT_OOM) + page_table, pmd, ptl, pte) & VM_FAULT_OOM) { + mem_cgroup_uncharge_page(page); ret = VM_FAULT_OOM; + } goto out; } @@ -2085,6 +2109,7 @@ unlock: out: return ret; out_nomap: + mem_cgroup_uncharge_page(page); pte_unmap_unlock(page_table, ptl); unlock_page(page); page_cache_release(page); @@ -2114,6 +2139,9 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma, goto oom; __SetPageUptodate(page); + if (mem_cgroup_charge(page, mm)) + goto oom_free_page; + entry = mk_pte(page, vma->vm_page_prot); entry = maybe_mkwrite(pte_mkdirty(entry), vma); @@ -2131,8 +2159,11 @@ unlock: pte_unmap_unlock(page_table, ptl); return 0; release: + mem_cgroup_uncharge_page(page); page_cache_release(page); goto unlock; +oom_free_page: + __free_page(page); oom: return VM_FAULT_OOM; } @@ -2246,6 +2277,11 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, } + if (mem_cgroup_charge(page, mm)) { + ret = VM_FAULT_OOM; + goto out; + } + page_table = pte_offset_map_lock(mm, pmd, address, &ptl); /* @@ -2281,6 +2317,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, /* no need to invalidate: a not-present page won't be cached */ update_mmu_cache(vma, address, entry); } else { + mem_cgroup_uncharge_page(page); if (anon) page_cache_release(page); else -- cgit v1.2.3-55-g7522