From: Valentin Schneider <valentin.schneider@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@kernel.org, mgorman@suse.de, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com,
joshdon@google.com, linux-kernel@vger.kernel.org, greg@kroah.com
Subject: Re: [PATCH 4/9] sched: Move SCHED_DEBUG to debugfs
Date: Wed, 07 Apr 2021 13:57:22 +0100 [thread overview]
Message-ID: <878s5untfx.mognet@arm.com> (raw)
In-Reply-To: <YG2lBimj3cKMErA7@hirez.programming.kicks-ass.net>
On 07/04/21 14:26, Peter Zijlstra wrote:
> On Wed, Apr 07, 2021 at 11:46:43AM +0100, Valentin Schneider wrote:
>> I can't find the threads in a hurry, but ISTR justifications for keeping
>> this around were:
>> - Most distros have CONFIG_SCHED_DEBUG=y because knobs and ponies
>> - Topology debug prints are "too verbose"
>
> ^^ that mostly.
>
>> - NUMA distance matrix processing gets slower
>>
>> If we make it so distros stop / don't need to select CONFIG_SCHED_DEBUG,
>
> We're not there yet, I think :-(
>
Yeah, I know, a man can dream... At least now I can make use of
CMDLINE_EXTEND on arm64.
>> then I don't think the above really stands anymore (also, sched_init_numa()
>> now has the same complexity regardless of sched_debug), and we could keep
>> everything under CONFIG_SCHED_DEBUG.
>
> But yes, the reason this knob exists is ebcause I too frequently forget
> to add the boot time knob, so I added this one to enable it at runtime
> and then I get topology prints when I hotplug cycle a cpu.
next prev parent reply other threads:[~2021-04-07 12:57 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-26 10:33 [PATCH 0/9] sched: Clean up SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 1/9] sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 2/9] sched: Remove sched_schedstats sysctl out from under SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 3/9] sched: Dont make LATENCYTOP select SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 4/9] sched: Move SCHED_DEBUG to debugfs Peter Zijlstra
2021-03-26 11:06 ` Greg KH
2021-04-07 10:46 ` Valentin Schneider
2021-04-07 12:26 ` Peter Zijlstra
2021-04-07 12:57 ` Valentin Schneider [this message]
2021-03-26 10:33 ` [PATCH 5/9] sched,preempt: Move preempt_dynamic to debug.c Peter Zijlstra
2021-03-26 10:33 ` [PATCH 6/9] debugfs: Implement debugfs_create_str() Peter Zijlstra
2021-03-26 11:05 ` Greg KH
2021-03-26 11:18 ` Peter Zijlstra
2021-03-26 11:30 ` Greg KH
2021-03-26 11:38 ` [PATCH v2 " Peter Zijlstra
2021-03-26 12:18 ` Greg KH
2021-03-26 12:53 ` Rasmus Villemoes
2021-03-26 12:57 ` Greg KH
2021-03-26 13:10 ` Rasmus Villemoes
2021-03-26 14:12 ` Peter Zijlstra
2021-03-26 14:19 ` Greg KH
2021-03-26 14:22 ` Peter Zijlstra
2021-03-26 14:58 ` Rasmus Villemoes
2021-03-26 15:19 ` Peter Zijlstra
2021-03-27 10:41 ` Greg KH
2021-03-26 14:50 ` [PATCH v3 " Peter Zijlstra
2021-03-27 10:42 ` Greg KH
2021-03-27 22:24 ` [PATCH " Al Viro
2021-03-28 0:33 ` Steven Rostedt
2021-03-26 10:33 ` [PATCH 7/9] sched,debug: Convert sysctl sched_domains to debugfs Peter Zijlstra
2021-03-26 13:11 ` Dietmar Eggemann
2021-04-07 10:46 ` Valentin Schneider
2021-04-07 12:18 ` Peter Zijlstra
2021-03-26 10:34 ` [PATCH 8/9] sched: Move /proc/sched_debug " Peter Zijlstra
2021-03-26 11:05 ` Greg KH
2021-03-26 10:34 ` [PATCH 9/9] sched,fair: Alternative sched_slice() Peter Zijlstra
2021-03-26 12:08 ` Dietmar Eggemann
2021-03-26 14:07 ` Peter Zijlstra
2021-03-26 15:37 ` Vincent Guittot
2021-03-26 18:30 ` Peter Zijlstra
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