Re: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and->batch

From: Cody P Schafer
Date: Mon Apr 08 2013 - 15:37:40 EST

On 04/06/2013 06:32 PM, Simon Jeons wrote:
Hi Cody,
On 04/06/2013 04:33 AM, Cody P Schafer wrote:
In one case while modifying the ->high and ->batch fields of per cpu
we're unneededly using stop_machine() (patches 1 & 2), and in another
we don't have any
syncronization at all (patch 3).

Do you mean stop_machine() is used for syncronization between each
online cpu?

I mean that it looks like synchronization between cpus is unneeded because of how per cpu pagesets are used, so stop_machine() (which does provide syncro between all cpus) is unnecessarily "strong".

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