linux-kernel - Re: [QUICKLIST 0/4] Arch independent quicklists V2

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: <45F65ADA.9010501@yahoo.com.au>
Date:	Tue, 13 Mar 2007 19:03:38 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Christoph Lameter <clameter@....com>, linux-mm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2

Andrew Morton wrote:
>>On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:
>>Page table pages have the characteristics that they are typically zero
>>or in a known state when they are freed.
> 
> 
> Well if they're zero then perhaps they should be released to the page allocator
> to satisfy the next __GFP_ZERO request.  If that request is for a pagetable
> page, we break even (except we get to remove special-case code).  If that
> __GFP_ZERO allocation was or some application other than for a pagetable, we
> win.
> 
> iow, can we just nuke 'em?

Page allocator still requires interrupts to be disabled, which this doesn't.

Considering there isn't much else that frees known zeroed pages, I wonder if
it is worthwhile.

Last time the zeroidle discussion came up was IIRC not actually real performance
gain, just cooking the 1024 CPU threaded pagefault numbers ;)

-- 
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com 
-
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/