linux-kernel - Re: [PATCH] sched/numa: Fix NULL pointer access to mm

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: <20250703123626.GW1613200@noisy.programming.kicks-ass.net>
Date: Thu, 3 Jul 2025 14:36:26 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Libo Chen <libo.chen@...cle.com>
Cc: "Chen, Yu C" <yu.c.chen@...el.com>, Michal Hocko <mhocko@...e.com>,
	Ingo Molnar <mingo@...hat.com>, 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>,
	Valentin Schneider <vschneid@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tim Chen <tim.c.chen@...el.com>, linux-kernel@...r.kernel.org,
	Jirka Hladky <jhladky@...hat.com>,
	Srikanth Aithal <Srikanth.Aithal@....com>,
	Suneeth D <Suneeth.D@....com>
Subject: Re: [PATCH] sched/numa: Fix NULL pointer access to mm_struct durng
 task swap

On Thu, Jul 03, 2025 at 05:20:47AM -0700, Libo Chen wrote:

> I agree. The other parts, schedstat and vmstat, are still quite helpful.
> Also tracepoints are more expensive than counters once enabled, I think
> that's too much for just counting numbers.

I'm not generally a fan of eBPF, but supposedly it is really good for
stuff like this. 

Attaching to a tracepoint and distributing into cgroup buckets seems
like it should be a trivial script.