Re: [PATCH] mm, page_alloc: optimize batch count infree_pcppages_bulk()

From: Andrew Morton
Date: Tue Aug 06 2013 - 18:24:04 EST

On Tue, 6 Aug 2013 17:40:40 +0900 Joonsoo Kim <> wrote:

> If we use a division operation, we can compute a batch count more closed
> to ideal value. With this value, we can finish our job within
> MIGRATE_PCPTYPES iteration. In addition, batching to free more pages
> may be helpful to cache usage.

hm, maybe. The .text got 120 bytes larger so the code now will
eject two of someone else's cachelines, which can't be good. I need
more convincing, please ;)

(bss got larger too - I don't have a clue why this happens).

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