linux-kernel - Re: [RFC PATCH 0/2] sched: simplify the select_task_rq

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Message-ID: <1358865692.5782.420.camel@marge.simpson.net>
Date:	Tue, 22 Jan 2013 15:41:32 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	peterz@...radead.org, mingo@...nel.org, a.p.zijlstra@...llo.nl
Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()

On Tue, 2013-01-22 at 16:56 +0800, Michael Wang wrote:

> What about this patch? May be the wrong map is the killer on balance
> path, should we check it? ;-) 

[    1.232249] Brought up 40 CPUs
[    1.236003] smpboot: Total of 40 processors activated (180873.90 BogoMIPS)
[    1.244744] CPU0 attaching sched-domain:
[    1.254131] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
[    1.252010]  domain 0: span 0,16 level SIBLING
[    1.280001]   groups: 0 (cpu_power = 589) 16 (cpu_power = 589)
[    1.292540]   domain 1: span 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38 level MC
[    1.312001]    groups: 0,16 (cpu_power = 1178) 2,18 (cpu_power = 1178) 4,20 (cpu_power = 1178) 6,22 (cpu_power = 1178) 8,24 (cpu_power = 1178)
                         10,26 (cpu_power = 1178)12,28 (cpu_power = 1178)14,30 (cpu_power = 1178)32,36 (cpu_power = 1178)34,38 (cpu_power = 1178)
[    1.368002]    domain 2: span 0-39 level NUMA
[    1.376001]     groups: 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38 (cpu_power = 11780)
                           1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39 (cpu_power = 11780)
[    1.412546] WYT: sbm of cpu 0
[    1.416001] WYT:      exec map
[    1.424002] WYT:              sd 6ce55000, idx 0, level 0, weight 2
[    1.436001] WYT:              sd 6ce74000, idx 1, level 1, weight 20
[    1.448001] WYT:              sd 6cef3000, idx 3, level 3, weight 40
[    1.460001] WYT:      fork map
[    1.468001] WYT:              sd 6ce55000, idx 0, level 0, weight 2
[    1.480001] WYT:              sd 6ce74000, idx 1, level 1, weight 20
[    1.492001] WYT:              sd 6cef3000, idx 3, level 3, weight 40
[    1.504001] WYT:      wake map
                                 Hi, we're not home right now...
[    1.508001] WYT:      affine map
[    1.516001] WYT:              affine with cpu 0 in sd 6ce55000, weight 2
[    1.528001] WYT:              affine with cpu 1 in sd 6cef3000, weight 40
[    1.544001] WYT:              affine with cpu 2 in sd 6ce74000, weight 20
[    1.556001] WYT:              affine with cpu 3 in sd 6cef3000, weight 40
[    1.568001] WYT:              affine with cpu 4 in sd 6ce74000, weight 20
[    1.584001] WYT:              affine with cpu 5 in sd 6cef3000, weight 40
[    1.596001] WYT:              affine with cpu 6 in sd 6ce74000, weight 20
[    1.608001] WYT:              affine with cpu 7 in sd 6cef3000, weight 40
[    1.624001] WYT:              affine with cpu 8 in sd 6ce74000, weight 20
[    1.636001] WYT:              affine with cpu 9 in sd 6cef3000, weight 40
[    1.648001] WYT:              affine with cpu a in sd 6ce74000, weight 20
[    1.660001] WYT:              affine with cpu b in sd 6cef3000, weight 40
[    1.676001] WYT:              affine with cpu c in sd 6ce74000, weight 20
[    1.688001] WYT:              affine with cpu d in sd 6cef3000, weight 40
[    1.700001] WYT:              affine with cpu e in sd 6ce74000, weight 20
[    1.716001] WYT:              affine with cpu f in sd 6cef3000, weight 40
[    1.728001] WYT:              affine with cpu 10 in sd 6ce55000, weight 2
[    1.740001] WYT:              affine with cpu 11 in sd 6cef3000, weight 40
[    1.756001] WYT:              affine with cpu 12 in sd 6ce74000, weight 20
[    1.768001] WYT:              affine with cpu 13 in sd 6cef3000, weight 40
[    1.780001] WYT:              affine with cpu 14 in sd 6ce74000, weight 20
[    1.796001] WYT:              affine with cpu 15 in sd 6cef3000, weight 40
[    1.808001] WYT:              affine with cpu 16 in sd 6ce74000, weight 20
[    1.820001] WYT:              affine with cpu 17 in sd 6cef3000, weight 40
[    1.836001] WYT:              affine with cpu 18 in sd 6ce74000, weight 20
[    1.848001] WYT:              affine with cpu 19 in sd 6cef3000, weight 40
[    1.860001] WYT:              affine with cpu 1a in sd 6ce74000, weight 20
[    1.876001] WYT:              affine with cpu 1b in sd 6cef3000, weight 40
[    1.888001] WYT:              affine with cpu 1c in sd 6ce74000, weight 20
[    1.900001] WYT:              affine with cpu 1d in sd 6cef3000, weight 40
[    1.916001] WYT:              affine with cpu 1e in sd 6ce74000, weight 20
[    1.928001] WYT:              affine with cpu 1f in sd 6cef3000, weight 40
[    1.940001] WYT:              affine with cpu 20 in sd 6ce74000, weight 20
[    1.956001] WYT:              affine with cpu 21 in sd 6cef3000, weight 40
[    1.968001] WYT:              affine with cpu 22 in sd 6ce74000, weight 20
[    1.984001] WYT:              affine with cpu 23 in sd 6cef3000, weight 40
[    1.996001] WYT:              affine with cpu 24 in sd 6ce74000, weight 20
[    2.008002] WYT:              affine with cpu 25 in sd 6cef3000, weight 40
[    2.024002] WYT:              affine with cpu 26 in sd 6ce74000, weight 20
[    2.036001] WYT:              affine with cpu 27 in sd 6cef3000, weight 40

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