linux-kernel - Re: [PATCH 2/2] sched/topology: optimize topology_span

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: <ZrJk00cmVaUIAr4G@yury-ThinkPad>
Date: Tue, 6 Aug 2024 11:00:51 -0700
From: Yury Norov <yury.norov@...il.com>
To: Valentin Schneider <vschneid@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Leonardo Bras <leobras@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH 2/2] sched/topology: optimize topology_span_sane()

On Tue, Aug 06, 2024 at 05:50:23PM +0200, Valentin Schneider wrote:
> On 02/08/24 10:57, Yury Norov wrote:
> > The function may call cpumask_equal with tl->mask(cpu) == tl->mask(i),
> > even when cpu != i.
> 
> For which architecture have you observed this? AFAIA all implementations of
> tl->sched_domain_mask_f are built on a per-CPU cpumask.

x86_64, qemu emulating 16 CPUs in 4 nodes, Linux 6.10, approximately
defconfig.