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Date: Wed, 5 Nov 2008 17:27:08 -0800
Message-ID: <1786ab030811051727w73168a3eq64939567826e76a9@mail.gmail.com>
Subject: Re: Metadata in sys_sync_file_range and fadvise(DONTNEED)
From: Chad Talbott <ctalbott@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, mrubin@google.com
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On Wed, Nov 5, 2008 at 5:07 PM, Andrew Morton <akpm@linux-foundation.org> wrote:
> On Wed, 5 Nov 2008 16:56:54 -0800
> Chad Talbott <ctalbott@google.com> wrote:
>> So in the new world, an application should call sync_file_range
>> (solving my problem by including metadata) to initiate writeout, and
>> then call posix_fadvise(DONTNEED) to drop the pages from page cache?
>> I think this would work for me.
>
> That would work.
>
> Although Nick is threatening to make
> sync_file_range(SYNC_FILE_RANGE_WRITE) all slow by using WB_SYNC_ALL,
> probably unnecessarily, ho hum.

Boo!  That will drive users (me at least) running back to
posix_fadvise(DONTNEED) for the non-blocking-writeback-inducing side
effect.

Chad
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