From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>,
mingo@kernel.org, vincent.guittot@linaro.org
Cc: linux-kernel@vger.kernel.org, juri.lelli@redhat.com,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de, bristot@redhat.com,
corbet@lwn.net, qyousef@layalina.io, chris.hyser@oracle.com,
patrick.bellasi@matbug.net, pjt@google.com, pavel@ucw.cz,
qperret@google.com, tim.c.chen@linux.intel.com,
joshdon@google.com, timj@gnu.org, kprateek.nayak@amd.com,
yu.c.chen@intel.com, youssefesmat@chromium.org,
joel@joelfernandes.org
Subject: Re: [PATCH 10/10] sched/fair: Implement an EEVDF like policy
Date: Thu, 09 Mar 2023 05:23:33 +0100 [thread overview]
Message-ID: <5b567c5aecabf0a89d92593d99a73bef41bd65da.camel@gmx.de> (raw)
In-Reply-To: <9fd2c37a05713c206dcbd5866f67ce779f315e9e.camel@gmx.de>
On Wed, 2023-03-08 at 14:36 +0100, Mike Galbraith wrote:
>
> Remember this little bugger, allegedly distilled from a real
> application control thread starvation issue?
>
> 6.3.0.g8ca09d5-master
> homer:/root # time taskset -c 3 starve
> expecting to receive 10000000 signals
>
> real 0m24.424s
> user 0m4.468s
> sys 0m18.957s
>
> 6.3.0.g8ca09d5-eevdf
> homer:/root # time taskset -c 3 starve
> expecting to receive 10000000 signals
> zzzzzz
> ^C
Ok, seems there must be a math booboo lurking.
virgin source, 100% hog vs tbench buddy pair, all pinned.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
5060 root 20 0 4420 680 680 R 96.01 0.004 0:41.40 3 cpuhog
5058 root 20 0 25500 1920 1792 S 2.326 0.012 0:01.05 3 tbench
5059 root 20 0 8796 896 768 R 1.661 0.006 0:00.78 3 tbench_srv
echo NO_PRESERVE_LAG > features
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
5060 root 20 0 4420 680 680 R 99.33 0.004 1:28.24 3 cpuhog
5058 root 20 0 25500 1920 1792 R 0.333 0.012 0:01.75 3 tbench
5059 root 20 0 8796 896 768 S 0.333 0.006 0:01.30 3 tbench_srv
next prev parent reply other threads:[~2023-03-09 4:24 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-06 13:25 [PATCH 00/10] sched: EEVDF using latency-nice Peter Zijlstra
2023-03-06 13:25 ` [PATCH 01/10] sched: Introduce latency-nice as a per-task attribute Peter Zijlstra
2023-03-06 13:25 ` [PATCH 02/10] sched/core: Propagate parent tasks latency requirements to the child task Peter Zijlstra
2023-03-06 13:25 ` [PATCH 03/10] sched: Allow sched_{get,set}attr to change latency_nice of the task Peter Zijlstra
2023-03-06 13:25 ` [PATCH 04/10] sched/fair: Add latency_offset Peter Zijlstra
2023-03-06 13:25 ` [PATCH 05/10] sched/fair: Add sched group latency support Peter Zijlstra
2023-03-06 13:25 ` [PATCH 06/10] sched/fair: Add avg_vruntime Peter Zijlstra
2023-03-21 13:58 ` Chen Yu
2023-03-21 16:04 ` Peter Zijlstra
2023-03-24 7:12 ` Chen Yu
2023-03-24 10:03 ` Peter Zijlstra
2023-03-06 13:25 ` [PATCH 07/10] sched/fair: Remove START_DEBIT Peter Zijlstra
2023-03-06 13:25 ` [PATCH 08/10] sched/fair: Add lag based placement Peter Zijlstra
2023-03-16 22:49 ` Tim Chen
2023-03-06 13:25 ` [PATCH 09/10] rbtree: Add rb_add_augmented_cached() helper Peter Zijlstra
2023-03-06 13:25 ` [PATCH 10/10] sched/fair: Implement an EEVDF like policy Peter Zijlstra
2023-03-08 8:39 ` Mike Galbraith
2023-03-08 9:26 ` Mike Galbraith
2023-03-08 13:36 ` Mike Galbraith
2023-03-09 4:23 ` Mike Galbraith [this message]
2023-03-10 20:38 ` Peter Zijlstra
2023-03-11 5:53 ` Mike Galbraith
2023-03-11 7:56 ` Mike Galbraith
2023-03-09 9:06 ` Peter Zijlstra
2023-03-09 12:44 ` Peter Zijlstra
2023-03-09 15:29 ` Peter Zijlstra
2023-03-09 15:39 ` Peter Zijlstra
2023-03-09 16:24 ` Mike Galbraith
2023-03-09 16:42 ` Peter Zijlstra
2023-03-07 10:27 ` [PATCH 00/10] sched: EEVDF using latency-nice Vincent Guittot
2023-03-07 13:08 ` Peter Zijlstra
2023-03-08 15:13 ` Shrikanth Hegde
2023-03-22 6:49 ` K Prateek Nayak
2023-03-22 9:38 ` K Prateek Nayak
2023-03-23 11:53 ` Pavel Machek
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