On Fri, Jul 22, 2011 at 02:23:19PM +0100, Mel Gorman wrote:
> On Fri, Jul 22, 2011 at 02:53:48PM +0200, Peter Zijlstra wrote:
> > On Thu, 2011-07-21 at 17:28 +0100, Mel Gorman wrote:
> > > When direct reclaim encounters a dirty page, it gets recycled around
> > > the LRU for another cycle. This patch marks the page PageReclaim
> > > similar to deactivate_page() so that the page gets reclaimed almost
> > > immediately after the page gets cleaned. This is to avoid reclaiming
> > > clean pages that are younger than a dirty page encountered at the
> > > end of the LRU that might have been something like a use-once page.
> > >
> >
> > > @@ -834,7 +834,15 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> > > */
> > > if (page_is_file_cache(page) &&
> > > (!current_is_kswapd() || priority >= DEF_PRIORITY - 2)) {
> > > - inc_zone_page_state(page, NR_VMSCAN_WRITE_SKIP);
> > > + /*
> > > + * Immediately reclaim when written back.
> > > + * Similar in principal to deactivate_page()
> > > + * except we already have the page isolated
> > > + * and know it's dirty
> > > + */
> > > + inc_zone_page_state(page, NR_VMSCAN_INVALIDATE);
> > > + SetPageReclaim(page);
> > > +
> >
> > I find the invalidate name somewhat confusing. It makes me think we'll
> > drop the page without writeback, like invalidatepage().
>
> I wasn't that happy with it either to be honest but didn't think of a
> better one at the time. nr_reclaim_deferred?
How about "NR_VMSCAN_IMMEDIATE_RECLAIM" like comment rotate_reclaimable_page?
>
> --
> Mel Gorman
> SUSE Labs
--
Kind regards,
Minchan Kim
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