Re: [RFC PATCH] mm: handle simple case in free_pcppages_bulk()

[Minchan Kim]

On Thu, Feb 10, 2011 at 10:18 PM, Namhyung Kim <namhyung@xxxxxxxxx> wrote:
> 2011-02-10 (ë), 22:10 +0900, Minchan Kim:
>> Hello Namhyung,
>>
>
> Hi Minchan,
>
>
>> On Thu, Feb 10, 2011 at 8:46 PM, Namhyung Kim <namhyung@xxxxxxxxx> wrote:
>> > Now I'm seeing that there are some cases to free all pages in a
>> > pcp lists. In that case, just frees all pages in the lists instead
>> > of being bothered with round-robin lists traversal.
>>
>> I though about that but I didn't send the patch.
>> That's because many cases which calls free_pcppages_bulk(,
>> pcp->count,..) are slow path so it adds comparison overhead on fast
>> path while it loses the effectiveness in slow path.
>>
>
> Hmm.. How about adding unlikely() then? Doesn't it help much here?

Yes. It would help but I am not sure how much it is.
AFAIR, when Mel submit the patch, he tried to prove the effectiveness
with some experiment and profiler.
I think if you want it really, we might need some number.
I am not sure it's worth.




-- 
Kind regards,
Minchan Kim
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