linux-kernel - Re: No, really, stop trying to delete slab until you've finished making slub perform as well

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Message-Id: <20080819192515.12C5.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue, 19 Aug 2008 19:34:18 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com, Matthew Wilcox <matthew@....cx>,
	Pekka Enberg <penberg@...helsinki.fi>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	andi@...stfloor.org, Rik van Riel <riel@...hat.com>
Subject: Re: No, really, stop trying to delete slab until you've finished making slub perform as well

> > +#if 0
> >         if (!s->remote_node_defrag_ratio ||
> >                         get_cycles() % 1024 > s->remote_node_defrag_ratio)
> >                 return NULL;
> > +#endif
> > 
> >         zonelist = node_zonelist(slab_node(current->mempolicy), flags);
> >         for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
> 
> Hmmm.... So always take from partial lists works? That is the same effect that
> the setting of the remote_defrag_ratio to 100 should have had (its multiplied
> by 10 when storing it).

Sorry, I don't know reason.
OK, I'll digg it more.

> So its a NUMA only phenomenon. How is performance affected?

Unfortunately, I can't mesure it.

because
   - Fujitsu server can access remote node fastly than typical numa server.
     So, my performance number often isn't typical.
   - My box (4G x2node) is very small in NUMA machine.
     but that is large server improving mechanism.

IOW, My box didn't happend performance regression.
but I think it isn't typical.



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