linux-kernel - Re: [cpuops cmpxchg V2 3/5] irq_work: Use per cpu atomics instead of regular atomics

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: <4D08EDA9.3090801@kernel.org>
Date:	Wed, 15 Dec 2010 17:32:41 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
CC:	akpm@...ux-foundation.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [cpuops cmpxchg V2 3/5] irq_work: Use per cpu atomics instead
 of regular atomics

On 12/14/2010 05:28 PM, Christoph Lameter wrote:
> The irq work queue is a per cpu object and it is sufficient for
> synchronization if per cpu atomics are used. Doing so simplifies
> the code and reduces the overhead of the code.
> 
> Before:
> 
> christoph@...ux-2.6$ size kernel/irq_work.o
>    text	   data	    bss	    dec	    hex	filename
>     451	      8	      1	    460	    1cc	kernel/irq_work.o
> 
> After:
> 
> christoph@...ux-2.6$ size kernel/irq_work.o 
>    text	   data	    bss	    dec	    hex	filename
>     438	      8	      1	    447	    1bf	kernel/irq_work.o
> 
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Peter, can you please ack this one?

Thanks.

-- 
tejun
--
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/