linux-kernel - Re: [patch 1/2] cpuacct: refactoring cpuusage_read / cpuusage

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] [day] [month] [year] [list]

Message-ID: <20081216111526.GC4299@elte.hu>
Date:	Tue, 16 Dec 2008 12:15:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ken Chen <kenchen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/2] cpuacct: refactoring cpuusage_read / cpuusage_write


* Ken Chen <kenchen@...gle.com> wrote:

> In the thread regarding to 'export percpu cpuacct cgroup stats'
> http://lkml.org/lkml/2008/12/7/13
> 
> akpm pointed out that current cpuacct code is inefficient.  This patch
> refactoring the following:
> 
> * make cpu_rq locking only on 32-bit
> * change iterator to each_present_cpu instead of each_possible_cpu to
>   make it hotplug friendly.
> 
> It's a bit of code churn, but I was rewarded with 160 byte code size saving
> on x86-64 arch and zero code size change on i386.

applied to tip/sched/core, thanks Ken!

	Ingo
--
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/