Re: [PATCH] mm: raise MemFree by reverting percpu_pagelist_fractionto 0

From: Sasha Levin
Date: Fri May 11 2012 - 04:31:19 EST

On Fri, May 11, 2012 at 10:00 AM, Hugh Dickins <hughd@xxxxxxxxxx> wrote:
> Commit 93278814d359 "mm: fix division by 0 in percpu_pagelist_fraction()"
> mistakenly initialized percpu_pagelist_fraction to the sysctl's minimum 8,
> which leaves 1/8th of memory on percpu lists (on each cpu??); but most of
> us expect it to be left unset at 0 (and it's not then used as a divisor).

I'm a bit confused about this, does it mean that once you set
percpu_pagelist_fraction to a value above the minimum, you can no
longer set it back to being 0?
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