From: Andrew Morton <akpm@osdl.org>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: linux-mm@kvack.org, piggin@cyberone.com.au
Subject: Re: [PATCH] kswapd shall not sleep during page shortage
Date: Tue, 9 Nov 2004 18:53:29 -0800 [thread overview]
Message-ID: <20041109185329.35eca4a1.akpm@osdl.org> (raw)
In-Reply-To: <20041109231654.GE8414@logos.cnet>
Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote:
>
>
> > And in that case, they may be
> > holding locks whcih prevent kswapd from being able to do any work either.
>
> OK... Just out of curiosity:
> Isnt the "lock contention" at this level (filesystem) a relatively rare situation?
>
It should be relatively rare - most of the blocking opportunities on the
writepage path should be avoided by now - we bale out, try another page,
throttle on some I/O completion if it's all not working out.
There are probably filesystem allocation semaphores. journal_start/stop
acts as a semaphore, as does get_request_wait().
It all depends on whether you're looking for common case or worst case. In
page reclaim we should tune for the common case, and avoid deadlocking in
the worst case.
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next prev parent reply other threads:[~2004-11-10 2:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-09 16:46 Marcelo Tosatti
2004-11-09 20:19 ` Andrew Morton
2004-11-09 17:41 ` Marcelo Tosatti
2004-11-09 21:33 ` Andrew Morton
2004-11-09 18:26 ` Marcelo Tosatti
2004-11-09 22:22 ` Andrew Morton
2004-11-09 20:31 ` Marcelo Tosatti
2004-11-10 0:28 ` Andrew Morton
2004-11-09 23:16 ` Marcelo Tosatti
2004-11-09 23:34 ` Marcelo Tosatti
2004-11-10 2:53 ` Andrew Morton [this message]
2004-11-10 18:14 ` Marcelo Tosatti
2004-11-10 22:08 ` Andrew Morton
2004-11-10 0:56 ` Nick Piggin
2004-11-10 2:49 ` Nick Piggin
2004-11-10 2:56 ` Andrew Morton
2004-11-10 3:12 ` Nick Piggin
2004-11-10 3:18 ` Andrew Morton
2004-11-10 3:27 ` Nick Piggin
2004-11-10 4:15 ` Nick Piggin
2004-11-10 8:17 ` Marcelo Tosatti
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