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

From: Linus Torvalds
Date: Fri May 11 2012 - 12:54:37 EST

On Fri, May 11, 2012 at 9:35 AM, Sasha Levin <levinsasha928@xxxxxxxxx> wrote:
> Once it's on, we reserve 1/x of the pages for the pagelists. I'm not
> sure why 8 was selected in the first place, but I guess it made sense
> that you don't want to reserve 15%+ of your memory for the pagelists.

Why not just accept any number, but turn small numbers into the minimum?

And if it's a per-cpu, then the minimum had better depend on number of
CPU's anyway. 15% of memory on a single-cpu already sounds insanely
high, but if you have several cpu's, it's going to be just totally

So a minimum of 8 already sounds broken. Exposing that minimum in a
way that makes it impossible to reset it sounds just insane.

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