From: Daniel Bristot de Oliveira <bristot@redhat.com>
To: linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: "Luis Claudio R . Goncalves" <lgoncalv@redhat.com>,
Clark Williams <williams@redhat.com>,
Luiz Capitulino <lcapitulino@redhat.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH V2 0/2] rt: Increase/decrease the nr of migratory tasks when enabling/disabling migration
Date: Mon, 26 Jun 2017 17:07:13 +0200 [thread overview]
Message-ID: <cover.1498482127.git.bristot@redhat.com> (raw)
This is the continuation of the:
[RFC] rt: Some fixes for migrate_disable/enable
However, migrate_disable/enable was reworked during the
4.11-rt window, so it turns out that 2 of 3 problems were fixed.
Good!
But there is still one problem, which is the dl/rt_nr_migratory inc/dec.
The problem is reproducible with the following command [in a 4 CPU box]:
# chrt -f 1 taskset -c 3 cat /dev/full | taskset -c 0-2 grep 'batman'
By applying only the patch 1/2, it is possible to see the problem with
the following command:
# cat /proc/sched_debug | grep rt_nr_migratory
.rt_nr_migratory : 18446744073709542849
.rt_nr_migratory : 18446744073709538566
.rt_nr_migratory : 18446744073709548257
.rt_nr_migratory : 0
The detailed description of the bug, and the fix, is in the log
of the patch 2/2.
Changes from V1:
- Print .dl/rt_nr_migratory only if CONFIG_SMP is set (Ingo Molnar)
- Use helper functions to reduce duplicated code (Ingo Molnar)
Changes from RFC:
- The problems addressed in the patches:
x rt: Update nr_cpus_allowed if the affinity of a task changes while its
migration is disabled
x rt: Checks if task needs migration when re-enabling migration
were fixed, so these patches are not needed anymore, while patch:
x rt: Increase/decrease the nr of migratory tasks when
enabling/disabling migration
is still needed, so it was reworked for the new implementation.
- The patch showing the rt/dl_nr_migratory was added.
Daniel Bristot de Oliveira (2):
sched/debug: Inform the number of rt/dl task that can migrate
rt: Increase/decrease the nr of migratory tasks when
enabling/disabling migration
kernel/sched/core.c | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
kernel/sched/debug.c | 17 +++++++++++++++--
2 files changed, 59 insertions(+), 7 deletions(-)
--
2.9.4
next reply other threads:[~2017-06-26 15:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-26 15:07 Daniel Bristot de Oliveira [this message]
2017-06-26 15:07 ` [PATCH V2 1/2] sched/debug: Inform the number of rt/dl task that can migrate Daniel Bristot de Oliveira
2017-06-30 13:09 ` [tip:sched/core] sched/debug: Expose the number of RT/DL tasks " tip-bot for Daniel Bristot de Oliveira
2017-06-26 15:07 ` [PATCH V2 2/2] rt: Increase/decrease the nr of migratory tasks when enabling/disabling migration Daniel Bristot de Oliveira
2017-06-27 14:55 ` Henri Roosen
2017-06-27 16:32 ` Daniel Bristot de Oliveira
2017-06-30 7:30 ` Ingo Molnar
2017-06-30 8:51 ` Daniel Bristot de Oliveira
2017-06-30 9:41 ` Ingo Molnar
2017-08-07 15:46 ` Sebastian Andrzej Siewior
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