linux-kernel - Re: [PATCH 3/3] add isolate pages vmstat

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Message-Id: <20090716132639.9D31.A69D9226@jp.fujitsu.com>
Date:	Thu, 16 Jul 2009 13:35:07 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH 3/3] add isolate pages vmstat

> > reproduce way
> > -----------------------
> > % ./hackbench 140 process 1000
> >    => OOM occur
> > 
> > active_anon:146 inactive_anon:0 isolated_anon:49245
> >  active_file:79 inactive_file:18 isolated_file:113
> >  unevictable:0 dirty:0 writeback:0 unstable:0 buffer:39
> >  free:370 slab_reclaimable:309 slab_unreclaimable:5492
> >  mapped:53 shmem:15 pagetables:28140 bounce:0
> > 
> > @@ -1164,6 +1170,9 @@ static unsigned long shrink_inactive_lis
> >  				spin_lock_irq(&zone->lru_lock);
> >  			}
> >  		}
> > +		__mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
> > +		__mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
> > +
> >    	} while (nr_scanned < max_scan);
> 
> This is a non-trivial amount of extra stuff.  Do we really need it?

In general, Administrator really hate large amount unaccounted memory.
Recent msgctl11 discussion, We faced it isolate pages about 1/3 system 
memory.
Ahtough Rik's patch is applied, vmscan can isolate >1GB memory.

That's my point.





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