Re: [PATCH 3/3] mm: when handling percpu_pagelist_fraction, use on_each_cpu()to set percpu pageset fields.

[Cody P Schafer]

On 04/06/2013 06:56 PM, Simon Jeons wrote:
> Hi Cody,
> On 04/06/2013 04:33 AM, Cody P Schafer wrote:
> > In free_hot_cold_page(), we rely on pcp->batch remaining stable.
> > Updating it without being on the cpu owning the percpu pageset
> > potentially destroys this stability.
>
> If cpu is off, can its pcp pageset be used in free_hot_code_page()?

I don't expect it to be as we use this_cpu_ptr() to access the pcp 
pageset. Unless there is some crazy mode where we can override the cpu a 
task believes it is running on...

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