linux-kernel - Re: [PATCH v5 0/6] memg: better numa scanning

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Date:	Wed, 10 Aug 2011 15:03:58 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH v5 0/6]  memg: better numa scanning

On Wed, 10 Aug 2011 09:15:44 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Tue, 9 Aug 2011 16:33:14 +0200
> Michal Hocko <mhocko@...e.cz> wrote:
> 
> > Hmm, 57% reduction of major page faults which doesn't fit with other
> > numbers. At least I do not see any corelation with them. Your workload
> > has freed more or less the same number of file pages (>1% less). Do you
> > have a theory for that?
> > 
> > Is it possible that this is caused by "memcg: stop vmscan when enough
> > done."?
> > 
> 

I did more runs. In this time, I did 3 sequence of runs per test. Then, 2nd, 3rd
runs will see some garbage(file cache) of previous runs. cpuset is not used.

[Nopatch]
[1] 772.07user 308.73system 4:05.41elapsed 440%CPU (0avgtext+0avgdata 1458400maxresident)k
    4519512inputs+7485704outputs (8078major+35671016minor)pagefaults 0swaps
[2] 774.19user 306.19system 4:03.05elapsed 444%CPU (0avgtext+0avgdata 1455472maxresident)k
    4502272inputs+5168832outputs (7815major+35691489minor)pagefaults 0swaps
[3] 773.99user 310.71system 4:00.31elapsed 451%CPU (0avgtext+0avgdata 1458144maxresident)k
    4518448inputs+8695352outputs (7768major+35683064minor)pagefaults 0swaps

[Patch 1-3 applied]
[1] 771.75user 312.82system 4:09.55elapsed 434%CPU (0avgtext+0avgdata 1458320maxresident)k
    4413032inputs+7895152outputs (8793major+35691822minor)pagefaults 0swaps
[2] 772.66user 308.93system 4:15.22elapsed 423%CPU (0avgtext+0avgdata 1457504maxresident)k
    4469120inputs+12484960outputs (10952major+35702053minor)pagefaults 0swaps
[3] 771.83user 305.53system 3:57.63elapsed 453%CPU (0avgtext+0avgdata 1457856maxresident)k
    4355392inputs+5169560outputs (6985major+35680863minor)pagefaults 0swaps

[Full Patched]
[1] 771.19user 303.37system 3:49.47elapsed 468%CPU (0avgtext+0avgdata 1458400maxresident)k
    4260032inputs+4919824outputs (5496major+35672873minor)pagefaults 0swaps
[2] 772.51user 305.90system 3:56.89elapsed 455%CPU (0avgtext+0avgdata 1458416maxresident)k
    4463728inputs+4621496outputs (6301major+35671610minor)pagefaults 0swaps
[3] 773.14user 305.02system 3:55.09elapsed 458%CPU (0avgtext+0avgdata 1458240maxresident)k
    4447088inputs+5190792outputs (5106major+35699087minor)pagefaults 0swaps

The patch 3 is require for patch 5 to work correctly (It makes node-selection unused.)
But it seems to be not more than that.

Thanks,
-Kame

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