linux-kernel - Re: [patch] sched: fix sd_parent_degenerate on non-numa smp machine

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]

Date:	Mon, 8 Dec 2008 13:53:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ken Chen <kenchen@...gle.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] sched: fix sd_parent_degenerate on non-numa smp machine


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

> The addition of SD_SERIALIZE flag added to SD_NODE_INIT prevented top level
> dummy numa sched_domain to be properly degenerated on non-numa smp machine.
> The reason is that in sd_parent_degenerate(), it found that the child and
> parent does not have comon sched_domain flags due to SD_SERIALIZE.  However,
> for non-numa smp box, the top level is a dummy with a single sched_group.
> 
> Filter out SD_SERIALIZE if it is on non-numa machine to properly degenerate
> top level node sched_domain.  this will cut back some of the sd domain walk
> in the load balancer code.
> 
> Signed-off-by: Ken Chen <kenchen@...gle.com>

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/