From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Hirokazu Takahashi <taka@valinux.co.jp>,
YAMAMOTO Takashi <yamamoto@valinux.co.jp>,
linux-mm@kvack.org
Subject: Re: [PATCH 06/15] memcg: bad page if page_cgroup when free
Date: Wed, 27 Feb 2008 14:08:21 +0530 [thread overview]
Message-ID: <20080227083646.GC2317@balbir.in.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0802252339310.27067@blonde.site>
* Hugh Dickins <hugh@veritas.com> [2008-02-25 23:40:14]:
> Replace free_hot_cold_page's VM_BUG_ON(page_get_page_cgroup(page)) by a
> "Bad page state" and clear: most users don't have CONFIG_DEBUG_VM on, and
> if it were set here, it'd likely cause corruption when the page is reused.
>
> Don't use page_assign_page_cgroup to clear it: that should be private to
> memcontrol.c, and always called with the lock taken; and memmap_init_zone
> doesn't need it either - like page->mapping and other pointers throughout
> the kernel, Linux assumes pointers in zeroed structures are NULL pointers.
>
> Instead use page_reset_bad_cgroup, added to memcontrol.h for this only.
>
> Signed-off-by: Hugh Dickins <hugh@veritas.com>
Looks good to me
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
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next prev parent reply other threads:[~2008-02-27 8:43 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-25 23:34 [PATCH 00/15] memcg: fixes and cleanups Hugh Dickins
2008-02-25 23:35 ` [PATCH 01/15] memcg: mm_match_cgroup not vm_match_cgroup Hugh Dickins
2008-02-26 0:39 ` David Rientjes
2008-02-26 3:27 ` Hugh Dickins
2008-02-26 2:41 ` Balbir Singh
2008-02-26 23:46 ` KAMEZAWA Hiroyuki
2008-02-28 3:47 ` Andrew Morton
2008-02-28 7:19 ` David Rientjes
2008-02-28 7:26 ` Andrew Morton
2008-02-28 8:08 ` Hugh Dickins
2008-02-25 23:36 ` [PATCH 02/15] memcg: move_lists on page not page_cgroup Hugh Dickins
2008-02-26 15:52 ` Balbir Singh
2008-02-26 23:45 ` KAMEZAWA Hiroyuki
2008-02-25 23:37 ` [PATCH 03/15] memcg: page_cache_release not __free_page Hugh Dickins
2008-02-26 16:02 ` Balbir Singh
2008-02-26 23:38 ` KAMEZAWA Hiroyuki
2008-02-25 23:38 ` [PATCH 04/15] memcg: when do_swap's do_wp_page fails Hugh Dickins
2008-02-26 23:41 ` KAMEZAWA Hiroyuki
2008-02-27 5:08 ` Balbir Singh
2008-02-27 12:57 ` Hugh Dickins
2008-02-25 23:39 ` [PATCH 05/15] memcg: fix VM_BUG_ON from page migration Hugh Dickins
2008-02-26 1:30 ` KAMEZAWA Hiroyuki
2008-02-27 5:52 ` Balbir Singh
2008-02-27 13:23 ` Hugh Dickins
2008-02-27 13:43 ` Balbir Singh
2008-02-25 23:40 ` [PATCH 06/15] memcg: bad page if page_cgroup when free Hugh Dickins
2008-02-26 23:44 ` KAMEZAWA Hiroyuki
2008-02-27 8:38 ` Balbir Singh [this message]
2008-02-25 23:41 ` [PATCH 07/15] memcg: mem_cgroup_charge never NULL Hugh Dickins
2008-02-26 1:32 ` KAMEZAWA Hiroyuki
2008-02-27 8:42 ` Balbir Singh
2008-02-25 23:42 ` [PATCH 08/15] memcg: remove mem_cgroup_uncharge Hugh Dickins
2008-02-26 1:34 ` KAMEZAWA Hiroyuki
2008-02-28 18:22 ` Balbir Singh
2008-02-25 23:43 ` [PATCH 09/15] memcg: memcontrol whitespace cleanups Hugh Dickins
2008-02-25 23:44 ` [PATCH 10/15] memcg: memcontrol uninlined and static Hugh Dickins
2008-02-26 1:36 ` KAMEZAWA Hiroyuki
2008-02-25 23:46 ` [PATCH 11/15] memcg: remove clear_page_cgroup and atomics Hugh Dickins
2008-02-26 1:38 ` KAMEZAWA Hiroyuki
2008-02-25 23:47 ` [PATCH 12/15] memcg: css_put after remove_list Hugh Dickins
2008-02-26 1:39 ` KAMEZAWA Hiroyuki
2008-02-25 23:49 ` [PATCH 13/15] memcg: fix mem_cgroup_move_lists locking Hugh Dickins
2008-02-26 1:43 ` KAMEZAWA Hiroyuki
2008-02-26 2:56 ` Hugh Dickins
2008-02-25 23:50 ` [PATCH 14/15] memcg: simplify force_empty and move_lists Hugh Dickins, Hirokazu Takahashi
2008-02-26 1:48 ` KAMEZAWA Hiroyuki
2008-02-26 3:23 ` Hugh Dickins
2008-02-26 4:09 ` KAMEZAWA Hiroyuki
2008-02-25 23:51 ` [PATCH 15/15] memcg: fix oops on NULL lru list Hugh Dickins
2008-02-26 1:26 ` [PATCH 00/15] memcg: fixes and cleanups KAMEZAWA Hiroyuki
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