From: Hiroyuki Kamezawa <kamezawa.hiroyuki@gmail.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Christoph Hellwig <hch@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
Michel Lespinasse <walken@google.com>,
Mel Gorman <mgorman@suse.de>, Lutz Vieweg <lvml@5t9.de>
Subject: Re: [PATCH] mm: preallocate page before lock_page at filemap COW. (WasRe: [PATCH V2] mm: Do not keep page locked during page fault while charging it for memcg
Date: Fri, 24 Jun 2011 20:46:29 +0900 [thread overview]
Message-ID: <BANLkTin7TbK1dNjPG6jz_FaJy-QgOjDJaA@mail.gmail.com> (raw)
In-Reply-To: <20110624075742.GA10455@tiehlicka.suse.cz>
2011/6/24 Michal Hocko <mhocko@suse.cz>:
> Sorry, forgot to send my
> Reviewed-by: Michal Hocko <mhocko@suse>
>
Thanks.
> I still have concerns about this way to handle the issue. See the follow
> up discussion in other thread (https://lkml.org/lkml/2011/6/23/135).
>
> Anyway I think that we do not have many other options to handle this.
> Either we unlock, charge, lock&restes or we preallocate, fault in
>
I agree.
> Or am I missing some other ways how to do it? What do others think about
> these approaches?
>
Yes, I'd like to hear other mm specialists' suggestion. and I'll think
other way, again.
Anyway, memory reclaim with holding a lock_page() can cause big latency
or starvation especially when memcg is used. It's better to avoid it.
Thanks,
-Kame
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next prev parent reply other threads:[~2011-06-24 11:46 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-22 12:06 [PATCH] mm: Do not keep page locked during page fault while charging it for memcg Michal Hocko
2011-06-22 12:15 ` Christoph Hellwig
2011-06-22 12:32 ` [PATCH V2] " Michal Hocko
2011-06-23 6:08 ` [PATCH] memcg: unlock page before charging it. (WasRe: " KAMEZAWA Hiroyuki
2011-06-23 7:23 ` Daisuke Nishimura
2011-06-23 7:41 ` Michal Hocko
2011-06-23 8:08 ` KAMEZAWA Hiroyuki
2011-06-23 9:02 ` Michal Hocko
2011-06-23 10:01 ` [PATCH] mm: preallocate page before lock_page at filemap COW. " KAMEZAWA Hiroyuki
2011-06-23 11:58 ` Michal Hocko
2011-06-23 13:01 ` Hiroyuki Kamezawa
2011-06-23 13:23 ` Michal Hocko
2011-06-23 13:51 ` Hiroyuki Kamezawa
2011-06-24 7:57 ` Michal Hocko
2011-06-24 11:46 ` Hiroyuki Kamezawa [this message]
2011-07-12 9:48 ` Michal Hocko
2012-01-26 10:46 ` Lutz Vieweg
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