From: Andrew Morton <akpm@osdl.org>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: nikita@clusterfs.com, linux-fsdevel@vger.kernel.org,
ext2-devel@lists.sourceforge.net
Subject: Re: Bufferheads & page-cache reference
Date: Tue, 15 Feb 2005 12:00:14 -0800 [thread overview]
Message-ID: <20050215120014.34cd7334.akpm@osdl.org> (raw)
In-Reply-To: <1108496353.20053.1476.camel@dyn318077bld.beaverton.ibm.com>
Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> > Maybe DB2 dirties pages through mmap?
> >
> > Nikita.
>
> It does. Most databases dirty data using shared memory segments, but
> they do write to filesystem directly also.
If DB2 leaves that dirty data floating about in memory for a long time,
it'll eventually get written back via block_write_full_page(). But if you
run fsync or msync, it'll go to disk via ->writepages() and no bh's will be
attached.
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next prev parent reply other threads:[~2005-02-15 20:00 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-14 19:30 Bufferheads & page-cache reference Badari Pulavarty
2005-02-14 19:31 ` [Ext2-devel] " Sonny Rao
2005-02-14 21:40 ` Andrew Morton
2005-02-14 22:10 ` William Lee Irwin III
2005-02-14 22:31 ` Andrew Morton
2005-02-14 22:50 ` William Lee Irwin III
2005-02-15 0:22 ` Badari Pulavarty
2005-02-15 2:57 ` Andrew Morton
2005-02-15 16:03 ` Badari Pulavarty
2005-02-15 17:26 ` Andrew Morton
2005-02-15 1:27 ` Badari Pulavarty
2005-02-15 3:05 ` Andrew Morton
2005-02-15 16:46 ` Badari Pulavarty
2005-02-15 17:54 ` Andrew Morton
2005-02-15 18:15 ` Badari Pulavarty
2005-02-15 19:07 ` Nikita Danilov
2005-02-15 19:39 ` Badari Pulavarty
2005-02-15 20:00 ` Andrew Morton [this message]
2005-02-16 0:02 ` [RFC] [PATCH] Generic mpage_writepage() support Badari Pulavarty
2005-02-16 11:41 ` Nikita Danilov
2005-02-16 18:37 ` Badari Pulavarty
2005-02-16 19:09 ` Dave Kleikamp
2005-02-16 19:28 ` Badari Pulavarty
2005-02-16 19:43 ` Dave Kleikamp
2005-02-16 21:38 ` [Ext2-devel] " Badari Pulavarty
2005-02-16 21:46 ` Dave Kleikamp
2005-02-17 0:13 ` [RFC] [PATCH] nobh_write_page() support Badari Pulavarty
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