linux-kernel - Re: [PATCH v2 1/1] tracing/sched: add 'next_policy' to trace_sched

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: <20250924124547.GJ1386988@noisy.programming.kicks-ass.net>
Date: Wed, 24 Sep 2025 14:45:47 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Xiang Gao <gxxa03070307@...il.com>, mhiramat@...nel.org,
	mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	mathieu.desnoyers@...icios.com, andrii@...nel.org, mingo@...nel.org,
	oleg@...hat.com, akpm@...ux-foundation.org, gmonaco@...hat.com,
	ricardo.neri-calderon@...ux.intel.com, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	gaoxiang17 <gaoxiang17@...omi.com>
Subject: Re: [PATCH v2 1/1] tracing/sched: add 'next_policy' to
 trace_sched_switch

On Wed, Sep 24, 2025 at 02:41:07PM +0200, Peter Zijlstra wrote:

> That said, you can mostly guess the policy from the prio, I mean the
> distinction between fair/batch and rr/fifo gets lots, but you can
> readily tell the difference between the fair and rt and deadline tasks.

FWIW mixing RR and FIFO tasks is asking for pain, adding tracing
information isn't going to help you restore your sanity.