On Thu, Oct 20, 2011 at 08:33:00PM +0800, Wu Fengguang wrote:
> On Thu, Oct 20, 2011 at 08:09:09PM +0800, Wu Fengguang wrote:
> > Jan,
> >
> > I tried the below combined patch over the ioless one, and find some
> > minor regressions. I studied the thresh=1G/ext3-1dd case in particular
> > and find that nr_writeback and the iostat avgrq-sz drops from time to time.
> >
> > I'll try to bisect the changeset.
This is interesting, the culprit is found to be patch 1, which is
simply
if (work->for_kupdate) {
oldest_jif = jiffies -
msecs_to_jiffies(dirty_expire_interval * 10);
- work->older_than_this = &oldest_jif;
- }
+ } else if (work->for_background)
+ oldest_jif = jiffies;
Thanks,
Fengguang
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