Subject: Re: [RFC PATCH] ext3 writepage() journal avoidance
From: Dave Kleikamp <shaggy@austin.ibm.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Arjan van de Ven <arjan@infradead.org>, pbadari@us.ibm.com, sct@redhat.com,
       jack@suse.cz, linux-fsdevel@vger.kernel.org,
       linux-kernel@vger.kernel.org, Ext2-devel@lists.sourceforge.net
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Date: Fri, 10 Mar 2006 07:43:34 -0600
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On Fri, 2006-03-10 at 00:23 -0800, Andrew Morton wrote:
> Arjan van de Ven <arjan@infradead.org> wrote:
> >
> > 
> > > I'm not sure that PageMappedToDisk() gets set in all the right places
> > > though - it's mainly for the `nobh' handling and block_prepare_write()
> > > would need to be taught to set it.  I guess that'd be a net win, even if
> > > only ext3 uses it..
> > 
> > btw is nobh mature enough yet to become the default, or to just go away
> > entirely as option ?
> 
> I don't know how much usage it's had, sorry.  It's only allowed in
> data=writeback mode and not many people seem to use even that.

For what it's worth, jfs has been using the nobh_* paths almost since
they where introduced (exclusively, it's not an option), so at least the
vfs pieces have been exercised to some extent.
-- 
David Kleikamp
IBM Linux Technology Center

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