linux-kernel - Re: [PATCH] cpusets: Allocate heap only when required

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Message-ID: <alpine.DEB.2.02.1401240230190.9846@chino.kir.corp.google.com>
Date:	Fri, 24 Jan 2014 02:33:27 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Li Zefan <lizefan@...wei.com>
cc:	Viresh Kumar <viresh.kumar@...aro.org>, mingo@...nel.org,
	peterz@...radead.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, linux-kernel@...r.kernel.org,
	Cgroups <cgroups@...r.kernel.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] cpusets: Allocate heap only when required

On Fri, 24 Jan 2014, Li Zefan wrote:

> >> update_flag() routine uses heap only when spread_flag_changed is true. Otherwise
> >> heap isn't used, but is allocated and freed unnecessarily.
> >>
> 
> but harmless
> 

It's not harmless, if heap_init() fails with -ENOMEM then the write fails 
even though it may not be for memory_spread_page or memory_spread_slab, 
which is the minority of the callers of this function.
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