linux-kernel - Re: [PATCH 08/21] mm: Preemptible mmu

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: <20101129115324.31cc9005.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 29 Nov 2010 11:53:24 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...nel.dk>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Russell King <rmk@....linux.org.uk>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jeff Dike <jdike@...toit.com>, Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 08/21] mm: Preemptible mmu_gather

On Fri, 26 Nov 2010 15:38:51 +0100
Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> Make mmu_gather preemptible by using a small on stack list and use
> an option allocation to speed things up.
> 
> Preemptible mmu_gather is desired in general and usable once
> i_mmap_lock becomes a mutex. Doing it before the mutex conversion
> saves us from having to rework the code by moving the mmu_gather
> bits inside the i_mmap_lock.
> 
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: David Miller <davem@...emloft.net>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Russell King <rmk@....linux.org.uk>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> Cc: Jeff Dike <jdike@...toit.com>
> Cc: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Interesting, Hmm, how about using the 1st freed pages as tlb->pages
rathet than calling alloc_page() ? no benefits ?

Thanks,
-Kame

--
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/