Re: [PATCH] improve __GFP_COLD/__GFP_ZERO interaction

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>>> On 02.06.14 at 17:54, <david.vrabel@xxxxxxxxxx> wrote:
> On 02/06/14 15:46, Jan Beulich wrote:
>> 
>> --- 3.15-rc8/drivers/xen/balloon.c
>> +++ 3.15-rc8-clear-cold-highpage/drivers/xen/balloon.c
> 
> Please split the Xen part out into a separate patch since this is a
> useful cleanup either way.

Actually I'm not convinced the Xen part alone is a good change: By
switching to __GFP_COLD allocations without using suitable special
cased memory scrubbing you'd blow good parts of your data cache
for no good reason, i.e. this quite likely would introduce a
performance regression. Which I wouldn't want to put my name
under.

Jan

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