linux-kernel - Re: [PATCH] sched: reduce sched_domain

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Message-ID: <1358302166.23348.7.camel@liguang.fnst.cn.fujitsu.com>
Date:	Wed, 16 Jan 2013 10:09:26 +0800
From:	li guang <lig.fnst@...fujitsu.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	mingo@...hat.com, peterz@...radead.org, Morten.Rasmussen@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: reduce sched_domain_topology space

在 2013-01-16三的 10:51 +0900，Namhyung Kim写道：
> Hi, liguang
> 
> On Tue, 15 Jan 2013 17:15:18 +0800, liguang wrote:
> > sched_domain_topology space was allocated by the size
> > ARRAY_SIZE(default_topology) + sched_domains_numa_levels,
> > suppose CONFIG_SCHED_SMT, CONFIG_SCHED_MC were y,
> > "static struct sched_domain_topology_level default_topology[] = {
> >          { sd_init_SIBLING, cpu_smt_mask, },
> >          { sd_init_MC, cpu_coregroup_mask, },
> >          { sd_init_CPU, cpu_cpu_mask, },
> >          { NULL, },
> > };"
> > then, ARRAY_SIZE(default_topology) equals to 4,
> > default_topology's NULL entry was accounted,
> > but, the following allocation for other sched_domains_numa_levels
> > entries was startd at 3(for default_topology[3].init is NULL),
> > so, 1 entry was forgot.
> 
> I don't think it's forgotten.
> 
> The sched_domain_topology still needs NULL entry at the end.  So what
> the current code does is to set up following sched_domain_topology:
> 
> { default_topology (without last NULL entry), numa topology, NULL }
> 
> Thanks,
> Namhyung

Oh, that's a trick!
Thanks!

-- 
regards!
li guang

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