linux-kernel - Re: [PATCH] mm: raise MemFree by reverting percpu_pagelist

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CA+1xoqcChazS=TRt6-7GjJAzQNFLFXmO623rWwjRkdD5x3k=iw@mail.gmail.com>
Date:	Fri, 11 May 2012 10:30:56 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: raise MemFree by reverting percpu_pagelist_fraction
 to 0

On Fri, May 11, 2012 at 10:00 AM, Hugh Dickins <hughd@...gle.com> 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?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/