From: Johannes Weiner <hannes@cmpxchg.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Michal Hocko <mhocko@suse.cz>, Hugh Dickins <hughd@google.com>, David Rientjes <rientjes@google.com>, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [patch 11/11] mm: memcg: only check anon swapin page charges for swap cache Date: Thu, 5 Jul 2012 02:45:03 +0200 [thread overview] Message-ID: <1341449103-1986-12-git-send-email-hannes@cmpxchg.org> (raw) In-Reply-To: <1341449103-1986-1-git-send-email-hannes@cmpxchg.org> shmem knows for sure that the page is in swap cache when attempting to charge a page, because the cache charge entry function has a check for it. Only anon pages may be removed from swap cache already when trying to charge their swapin. Adjust the comment, though: '4969c11 mm: fix swapin race condition' added a stable PageSwapCache check under the page lock in the do_swap_page() before calling the memory controller, so it's unuse_pte()'s pte_same() that may fail. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> --- mm/memcontrol.c | 22 ++++++++++++++-------- 1 files changed, 14 insertions(+), 8 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d3701cd..9b7e256 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2751,14 +2751,6 @@ static int __mem_cgroup_try_charge_swapin(struct mm_struct *mm, return 0; if (!do_swap_account) goto charge_cur_mm; - /* - * A racing thread's fault, or swapoff, may have already updated - * the pte, and even removed page from swap cache: in those cases - * do_swap_page()'s pte_same() test will fail; but there's also a - * KSM case which does need to charge the page. - */ - if (!PageSwapCache(page)) - goto charge_cur_mm; memcg = try_get_mem_cgroup_from_page(page); if (!memcg) goto charge_cur_mm; @@ -2781,6 +2773,20 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm, struct page *page, *memcgp = NULL; if (mem_cgroup_disabled()) return 0; + /* + * A racing thread's fault, or swapoff, may have already + * updated the pte, and even removed page from swap cache: in + * those cases unuse_pte()'s pte_same() test will fail; but + * there's also a KSM case which does need to charge the page. + */ + if (!PageSwapCache(page)) { + int ret; + + ret = __mem_cgroup_try_charge(mm, gfp_mask, 1, memcgp, true); + if (ret == -EINTR) + ret = 0; + return ret; + } return __mem_cgroup_try_charge_swapin(mm, page, gfp_mask, memcgp); } -- 1.7.7.6
WARNING: multiple messages have this Message-ID (diff)
From: Johannes Weiner <hannes@cmpxchg.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Michal Hocko <mhocko@suse.cz>, Hugh Dickins <hughd@google.com>, David Rientjes <rientjes@google.com>, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [patch 11/11] mm: memcg: only check anon swapin page charges for swap cache Date: Thu, 5 Jul 2012 02:45:03 +0200 [thread overview] Message-ID: <1341449103-1986-12-git-send-email-hannes@cmpxchg.org> (raw) In-Reply-To: <1341449103-1986-1-git-send-email-hannes@cmpxchg.org> shmem knows for sure that the page is in swap cache when attempting to charge a page, because the cache charge entry function has a check for it. Only anon pages may be removed from swap cache already when trying to charge their swapin. Adjust the comment, though: '4969c11 mm: fix swapin race condition' added a stable PageSwapCache check under the page lock in the do_swap_page() before calling the memory controller, so it's unuse_pte()'s pte_same() that may fail. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> --- mm/memcontrol.c | 22 ++++++++++++++-------- 1 files changed, 14 insertions(+), 8 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d3701cd..9b7e256 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2751,14 +2751,6 @@ static int __mem_cgroup_try_charge_swapin(struct mm_struct *mm, return 0; if (!do_swap_account) goto charge_cur_mm; - /* - * A racing thread's fault, or swapoff, may have already updated - * the pte, and even removed page from swap cache: in those cases - * do_swap_page()'s pte_same() test will fail; but there's also a - * KSM case which does need to charge the page. - */ - if (!PageSwapCache(page)) - goto charge_cur_mm; memcg = try_get_mem_cgroup_from_page(page); if (!memcg) goto charge_cur_mm; @@ -2781,6 +2773,20 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm, struct page *page, *memcgp = NULL; if (mem_cgroup_disabled()) return 0; + /* + * A racing thread's fault, or swapoff, may have already + * updated the pte, and even removed page from swap cache: in + * those cases unuse_pte()'s pte_same() test will fail; but + * there's also a KSM case which does need to charge the page. + */ + if (!PageSwapCache(page)) { + int ret; + + ret = __mem_cgroup_try_charge(mm, gfp_mask, 1, memcgp, true); + if (ret == -EINTR) + ret = 0; + return ret; + } return __mem_cgroup_try_charge_swapin(mm, page, gfp_mask, memcgp); } -- 1.7.7.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-07-05 0:46 UTC|newest] Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-07-05 0:44 [patch 00/11] mm: memcg: charge/uncharge improvements Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-05 0:44 ` [patch 01/11] mm: memcg: fix compaction/migration failing due to memcg limits Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-09 2:27 ` Kamezawa Hiroyuki 2012-07-09 2:27 ` Kamezawa Hiroyuki 2012-07-09 2:27 ` Kamezawa Hiroyuki 2012-07-09 14:15 ` Michal Hocko 2012-07-09 14:15 ` Michal Hocko 2012-07-09 14:15 ` Michal Hocko 2012-07-05 0:44 ` [patch 02/11] mm: swapfile: clean up unuse_pte race handling Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-09 2:29 ` Kamezawa Hiroyuki 2012-07-09 2:29 ` Kamezawa Hiroyuki 2012-07-09 14:22 ` Michal Hocko 2012-07-09 14:22 ` Michal Hocko 2012-07-09 14:22 ` Michal Hocko 2012-07-05 0:44 ` [patch 03/11] mm: shmem: do not try to uncharge known swapcache pages Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-09 2:33 ` Kamezawa Hiroyuki 2012-07-09 2:33 ` Kamezawa Hiroyuki 2012-07-09 14:46 ` Michal Hocko 2012-07-09 14:46 ` Michal Hocko 2012-07-09 20:37 ` Hugh Dickins 2012-07-09 20:37 ` Hugh Dickins 2012-07-10 17:16 ` Michal Hocko 2012-07-10 17:16 ` Michal Hocko 2012-07-10 17:16 ` Michal Hocko 2012-07-11 18:48 ` Hugh Dickins 2012-07-11 18:48 ` Hugh Dickins 2012-07-11 18:48 ` Hugh Dickins 2012-07-12 13:51 ` Michal Hocko 2012-07-12 13:51 ` Michal Hocko 2012-07-09 20:11 ` Hugh Dickins 2012-07-09 20:11 ` Hugh Dickins 2012-07-09 20:11 ` Hugh Dickins 2012-07-05 0:44 ` [patch 04/11] mm: memcg: push down PageSwapCache check into uncharge entry functions Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-09 2:42 ` Kamezawa Hiroyuki 2012-07-09 2:42 ` Kamezawa Hiroyuki 2012-07-09 2:42 ` Kamezawa Hiroyuki 2012-07-09 7:36 ` Johannes Weiner 2012-07-09 7:36 ` Johannes Weiner 2012-07-09 7:36 ` Johannes Weiner 2012-07-09 15:02 ` Michal Hocko 2012-07-09 15:02 ` Michal Hocko 2012-07-09 15:02 ` Michal Hocko 2012-07-05 0:44 ` [patch 05/11] mm: memcg: only check for PageSwapCache when uncharging anon Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-09 2:49 ` Kamezawa Hiroyuki 2012-07-09 2:49 ` Kamezawa Hiroyuki 2012-07-09 2:49 ` Kamezawa Hiroyuki 2012-07-09 15:05 ` Michal Hocko 2012-07-09 15:05 ` Michal Hocko 2012-07-05 0:44 ` [patch 06/11] mm: memcg: move swapin charge functions above callsites Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-09 2:50 ` Kamezawa Hiroyuki 2012-07-09 2:50 ` Kamezawa Hiroyuki 2012-07-09 2:50 ` Kamezawa Hiroyuki 2012-07-09 15:10 ` Michal Hocko 2012-07-09 15:10 ` Michal Hocko 2012-07-05 0:44 ` [patch 07/11] mm: memcg: remove unneeded shmem charge type Johannes Weiner 2012-07-05 0:44 ` Johannes Weiner 2012-07-09 2:51 ` Kamezawa Hiroyuki 2012-07-09 2:51 ` Kamezawa Hiroyuki 2012-07-09 15:17 ` Michal Hocko 2012-07-09 15:17 ` Michal Hocko 2012-07-09 15:17 ` Michal Hocko 2012-07-05 0:45 ` [patch 08/11] mm: memcg: remove needless !mm fixup to init_mm when charging Johannes Weiner 2012-07-05 0:45 ` Johannes Weiner 2012-07-09 2:53 ` Kamezawa Hiroyuki 2012-07-09 2:53 ` Kamezawa Hiroyuki 2012-07-09 15:20 ` Michal Hocko 2012-07-09 15:20 ` Michal Hocko 2012-07-09 15:20 ` Michal Hocko 2012-07-10 6:10 ` Wanpeng Li 2012-07-10 6:10 ` Wanpeng Li 2012-07-10 6:10 ` Wanpeng Li 2012-07-10 6:21 ` Michal Hocko 2012-07-10 6:21 ` Michal Hocko 2012-07-10 6:21 ` Michal Hocko 2012-07-10 6:54 ` Wanpeng Li 2012-07-10 6:54 ` Wanpeng Li 2012-07-10 16:22 ` Michal Hocko 2012-07-10 16:22 ` Michal Hocko 2012-07-10 16:22 ` Michal Hocko 2012-07-05 0:45 ` [patch 09/11] mm: memcg: split swapin charge function into private and public part Johannes Weiner 2012-07-05 0:45 ` Johannes Weiner 2012-07-09 2:55 ` Kamezawa Hiroyuki 2012-07-09 2:55 ` Kamezawa Hiroyuki 2012-07-09 2:55 ` Kamezawa Hiroyuki 2012-07-09 15:28 ` Michal Hocko 2012-07-09 15:28 ` Michal Hocko 2012-07-09 15:28 ` Michal Hocko 2012-07-05 0:45 ` [patch 10/11] mm: memcg: only check swap cache pages for repeated charging Johannes Weiner 2012-07-05 0:45 ` Johannes Weiner 2012-07-09 3:26 ` Kamezawa Hiroyuki 2012-07-09 3:26 ` Kamezawa Hiroyuki 2012-07-09 15:32 ` Michal Hocko 2012-07-09 15:32 ` Michal Hocko 2012-07-05 0:45 ` Johannes Weiner [this message] 2012-07-05 0:45 ` [patch 11/11] mm: memcg: only check anon swapin page charges for swap cache Johannes Weiner 2012-07-09 3:44 ` Kamezawa Hiroyuki 2012-07-09 3:44 ` Kamezawa Hiroyuki 2012-07-09 3:44 ` Kamezawa Hiroyuki 2012-07-09 15:34 ` Michal Hocko 2012-07-09 15:34 ` Michal Hocko 2012-07-09 15:34 ` Michal Hocko 2012-07-09 15:35 ` [patch 00/11] mm: memcg: charge/uncharge improvements Michal Hocko 2012-07-09 15:35 ` Michal Hocko 2012-07-09 15:35 ` Michal Hocko
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