From: Andrew Morton <akpm@osdl.org>
To: Nikita Danilov <nikita@clusterfs.com>
Cc: linux-mm@kvack.org
Subject: Re: [PATCH]: VM 5/8 async-writepage
Date: Tue, 26 Apr 2005 01:36:32 -0700 [thread overview]
Message-ID: <20050426013632.55e958c8.akpm@osdl.org> (raw)
In-Reply-To: <17005.64094.860824.34597@gargle.gargle.HOWL>
Nikita Danilov <nikita@clusterfs.com> wrote:
>
> >
> > I don't understand this at all. ->writepage() is _already_ asynchronous.
> > It will only block under rare circumstances such as needing to perform a
> > metadata read or encountering disk queue congestion.
>
> This patch tries to decrease latency of direct reclaim by avoiding
>
> - occasional stalls you mentioned, and
>
> - CPU cost of ->writepage().
Seems a bit pointless then?
Have you quantified this?
> Plus, deferred pageouts will be easier to cluster.
hm. Why?
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next prev parent reply other threads:[~2005-04-26 8:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-17 17:37 Nikita Danilov
2005-04-18 1:10 ` Nick Piggin
2005-04-26 3:57 ` Andrew Morton
2005-04-26 8:22 ` Nikita Danilov
2005-04-26 8:36 ` Andrew Morton [this message]
2005-04-26 10:05 ` Nikita Danilov
2005-04-26 10:22 ` Nick Piggin
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