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

[KOSAKI Motohiro]

> 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@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
> Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>
> 
> -- 
> Kind regards,
> Minchan Kim
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@xxxxxxxxxx  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/