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SubjectRe: [PATCH v6 7/8] mm: only IPI CPUs to drain local pages if they exist
From
2012/1/9 Michal Nazarewicz <mina86@mina86.com>:
> On Mon, 09 Jan 2012 17:35:26 +0100, Christoph Lameter <cl@linux.com> wrote:
>
>> On Sun, 8 Jan 2012, Gilad Ben-Yossef wrote:
>>
>>> @@ -67,6 +67,14 @@ DEFINE_PER_CPU(int, numa_node);
>>>  EXPORT_PER_CPU_SYMBOL(numa_node);
>>>  #endif
>>>
>>> +/*
>>> + * A global cpumask of CPUs with per-cpu pages that gets
>>> + * recomputed on each drain. We use a global cpumask
>>> + * here to avoid allocation on direct reclaim code path
>>> + * for CONFIG_CPUMASK_OFFSTACK=y
>>> + */
>>> +static cpumask_var_t cpus_with_pcps;
>>
>>
>> Move the static definition into drain_all_pages()?
>
>
> This is initialised in setup_per_cpu_pageset() so it needs to be file
> scoped.

Yes. The cpumask_var_t abstraction is convenient and all but it does
make the allocation
very non obvious when it does not happen in proximity to the variable
use - it doesn't *look* like
a pointer. "syntactic sugar causes cancer of the semicolon" and all that.

Gilad



--
Gilad Ben-Yossef
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gilad@benyossef.com
Israel Cell: +972-52-8260388
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http://benyossef.com

"Unfortunately, cache misses are an equal opportunity pain provider."
-- Mike Galbraith, LKML
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