From: Linus Torvalds <torvalds@linux-foundation.org>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: raise MemFree by reverting percpu_pagelist_fraction to 0
Date: Fri, 11 May 2012 09:54:18 -0700 [thread overview]
Message-ID: <CA+55aFztbcB1sULup-rCsWmOaC7RFLvuJ=sqGQz=SAKzys02mw@mail.gmail.com> (raw)
In-Reply-To: <CA+1xoqc15HY1rECsJ6Aj1WMzwT12z4DByJhFopyBAiKawEFh3Q@mail.gmail.com>
On Fri, May 11, 2012 at 9:35 AM, Sasha Levin <levinsasha928@gmail.com> 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
crazy.
So a minimum of 8 already sounds broken. Exposing that minimum in a
way that makes it impossible to reset it sounds just insane.
Linus
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next prev parent reply other threads:[~2012-05-11 16:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-11 8:00 Hugh Dickins
2012-05-11 8:30 ` Sasha Levin
2012-05-11 8:38 ` Minchan Kim
2012-05-11 9:01 ` Minchan Kim
2012-05-11 16:27 ` Linus Torvalds
2012-05-11 16:35 ` Sasha Levin
2012-05-11 16:54 ` Linus Torvalds [this message]
2012-05-14 8:51 ` Cong Wang
2012-05-11 14:10 ` Hugh Dickins
2012-05-14 1:51 ` Minchan Kim
2012-05-11 16:26 ` Linus Torvalds
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