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 for Android: free password hash cracker in your pocket

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

Date:	Fri, 11 May 2012 18:35:00 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>, Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.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 6:27 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Fri, May 11, 2012 at 2:01 AM, Minchan Kim <minchan@...nel.org> wrote:
>>
>> I didn't have a time so made quick patch to show just concept.
>> Not tested and Not consider carefully.
>> If anyone doesn't oppose, I will send formal patch which will have more beauty code.
>
> What's so magical about that '8' *anyway*? We do we have that minimum at all?
>
> At the very least, the 8-vs-0 thing needs to be explained.

The '0' acts as an "off" switch.

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.
--
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/