linux-kernel - Re: [PATCH 4/5] add isolate pages vmstat

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Date:	Tue,  7 Jul 2009 11:12:33 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 4/5] add isolate pages vmstat

> It looks good to me. 
> Thanks for your effort. I added my review sign. :)
> 
> Let remain one side note. 
> This accounting feature results from direct reclaim bomb. 
> If we prevent direct reclaim bomb, I think this feature can be removed. 

Hmmm. I disagree.
isolated pages can become more than >1GB on server systems.
Who want >1GB unaccountable memory?



> 
> As I know, Rik or Wu is making patch for throttling direct reclaim. 
> 
> On Tue,  7 Jul 2009 10:19:53 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> 
> > > > > Index: b/mm/vmscan.c
> > > > > ===================================================================
> > > > > --- a/mm/vmscan.c
> > > > > +++ b/mm/vmscan.c
> > > > > @@ -1082,6 +1082,7 @@ static unsigned long shrink_inactive_lis
> > > > >  						-count[LRU_ACTIVE_ANON]);
> > > > >  		__mod_zone_page_state(zone, NR_INACTIVE_ANON,
> > > > >  						-count[LRU_INACTIVE_ANON]);
> > > > > +		__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
> > > > 
> > > > Lumpy can reclaim file + anon anywhere.  
> > > > How about using count[NR_LRU_LISTS]?
> > > 
> > > Ah yes, good catch.
> > 
> > Fixed.
> > 
> > Subject: [PATCH] add isolate pages vmstat
> > 
> > If the system have plenty threads or processes, concurrent reclaim can
> > isolate very much pages.
> > Unfortunately, current /proc/meminfo and OOM log can't show it.
> > 
> > This patch provide the way of showing this information.
> > 
> > 
> > reproduce way
> > -----------------------
> > % ./hackbench 140 process 1000
> >    => couse OOM
> > 
> > Active_anon:146 active_file:41 inactive_anon:0
> >  inactive_file:0 unevictable:0
> >  isolated_anon:49245 isolated_file:113
> >  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >  dirty:0 writeback:0 buffer:49 unstable:0
> >  free:184 slab_reclaimable:276 slab_unreclaimable:5492
> >  mapped:87 pagetables:28239 bounce:0
> > 
> > 
> > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Reviewed-by: Minchan Kim <minchan.kim@...il.com>
> 
> -- 
> Kind regards,
> Minchan Kim
> 
> --
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