linux-kernel - Re: [PATCH v4 1/2] sched/topology: improve topology_span

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Message-ID: <f5fad97d-f880-49a4-9595-ca3f5b41d9bb@amd.com>
Date: Wed, 11 Jun 2025 12:26:53 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Leon Romanovsky <leon@...nel.org>, Steve Wahl <steve.wahl@....com>
Cc: 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>, Valentin Schneider <vschneid@...hat.com>,
 linux-kernel@...r.kernel.org, Vishal Chourasia <vishalc@...ux.ibm.com>,
 samir <samir@...ux.ibm.com>, Naman Jain <namjain@...ux.microsoft.com>,
 Saurabh Singh Sengar <ssengar@...ux.microsoft.com>, srivatsa@...il.mit.edu,
 Michael Kelley <mhklinux@...look.com>, Russ Anderson <rja@....com>,
 Dimitri Sivanich <sivanich@....com>
Subject: Re: [PATCH v4 1/2] sched/topology: improve topology_span_sane speed

Hello Leon,

On 6/11/2025 11:36 AM, Leon Romanovsky wrote:
>> I don't think that's the full dmesg output, maybe a console capture
>> with reduced levels?  I'm not finding the output of sched_domain_debug() and
>> sched_domain_debug_one() here.
> It is not reduced, but standard debug level log, where KERN_DEBUG prints
> aren't printed.
> 
> I don't know why sched_verbose is implemented how it is implemented,
> but all these KERN_DEBUG prints in sched_domain_debug_one() are not controlled
> through sched_verbose.

Sorry for this oversight! Would it be possible to get the logs with
"ignore_loglevel" added to the kernel cmdline? Please and thank you.

Even the qemu cmdline for the guest can help! We can try reproducing
it at our end then. Thank you for all the help.

-- 
Thanks and Regards,
Prateek