From: Johannes Weiner <hannes@cmpxchg.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [PATCH -v2 5/6] memcg, kmem: clean up memcg parameter handling
Date: Tue, 4 Feb 2014 11:32:10 -0500 [thread overview]
Message-ID: <20140204163210.GQ6963@cmpxchg.org> (raw)
In-Reply-To: <1391520540-17436-6-git-send-email-mhocko@suse.cz>
On Tue, Feb 04, 2014 at 02:28:59PM +0100, Michal Hocko wrote:
> memcg_kmem_newpage_charge doesn't always set the given memcg parameter.
lol, I really don't get your patch order...
> Some early escape paths skip setting *memcg while
> __memcg_kmem_newpage_charge down the call chain sets *memcg even if no
> memcg is charged due to other escape paths.
>
> The current code is correct because the memcg is initialized to NULL
> at the highest level in __alloc_pages_nodemask but this all is very
> confusing and error prone. Let's make the semantic clear and move the
> memcg parameter initialization to the highest level of kmem accounting
> (memcg_kmem_newpage_charge).
>
> Signed-off-by: Michal Hocko <mhocko@suse.cz>
Patch looks good, though.
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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next prev parent reply other threads:[~2014-02-04 16:32 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-04 13:28 [PATCH -v2 0/6] memcg: some charge path cleanups + css offline vs. charge race fix Michal Hocko
2014-02-04 13:28 ` [PATCH -v2 1/6] memcg: do not replicate try_get_mem_cgroup_from_mm in __mem_cgroup_try_charge Michal Hocko
2014-02-04 15:55 ` Johannes Weiner
2014-02-04 16:05 ` Michal Hocko
2014-02-05 13:49 ` Michal Hocko
2014-02-04 13:28 ` [PATCH -v2 2/6] memcg: cleanup charge routines Michal Hocko
2014-02-04 16:05 ` Johannes Weiner
2014-02-04 16:12 ` Michal Hocko
2014-02-04 16:40 ` Johannes Weiner
2014-02-04 19:11 ` Michal Hocko
2014-02-04 19:36 ` Johannes Weiner
2014-02-04 13:28 ` [PATCH -v2 3/6] memcg: mm == NULL is not allowed for mem_cgroup_try_charge_mm Michal Hocko
2014-02-04 16:05 ` Johannes Weiner
2014-02-04 13:28 ` [PATCH -v2 4/6] memcg: make sure that memcg is not offline when charging Michal Hocko
2014-02-04 16:29 ` Johannes Weiner
2014-02-05 13:38 ` Michal Hocko
2014-02-05 15:28 ` Johannes Weiner
2014-02-05 15:42 ` Tejun Heo
2014-02-05 16:19 ` Michal Hocko
2014-02-05 16:29 ` Michal Hocko
2014-02-05 16:30 ` Tejun Heo
2014-02-05 16:45 ` Johannes Weiner
2014-02-05 17:23 ` Michal Hocko
2014-02-04 13:28 ` [PATCH -v2 5/6] memcg, kmem: clean up memcg parameter handling Michal Hocko
2014-02-04 16:32 ` Johannes Weiner [this message]
2014-02-04 16:42 ` Michal Hocko
2014-02-04 13:29 ` [PATCH -v2 6/6] Revert "mm: memcg: fix race condition between memcg teardown and swapin" Michal Hocko
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