Re: [RFC PATCH] ext3 writepage() journal avoidance

[Dave Jones <davej@redhat.com>]

On Fri, Mar 10, 2006 at 09:43:57AM +0100, Arjan van de Ven wrote:
 > 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.
 > 
 > would you be prepared to turn it on by default in -mm for a bit to see
 > how it holds up? The concept seems valuable in itself, so much so that I
 > feel this should be 1) on always by default when possible and 2) isn't
 > really the kind of thing that should be a long term option; not having
 > it almost is a -o pleaseAddThisBug option for each bug fixed.

It'd be good to get that hammered on, as it doesn't see hardly any testing
based upon the experiments I did sometime last year.  It left me with
an unmountable root filesystem :-/

		Dave

-- 
http://www.codemonkey.org.uk