From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@techsingularity.net>,
Rik van Riel <riel@surriel.com>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>, Wang <wang.yi59@zte.com.cn>,
zhong.weidong@zte.com.cn, Yi Liu <liu.yi24@zte.com.cn>,
Frederic Weisbecker <frederic@kernel.org>
Subject: [PATCH v3 0/3] isolcpus
Date: Fri, 26 Oct 2018 00:12:20 +0530 [thread overview]
Message-ID: <1540492943-17147-1-git-send-email-srikar@linux.vnet.ibm.com> (raw)
It looks like cpus_allowed can have a mix of isolcpus and non-isolcpus.
However that seems to cause some inconsistent behaviour esp with numa
balancing.
The first patch will only add a warning whenever a user tries to pass a mask
that has a mix of both isolcpus and nonisolcpus.
The second patch will detect and correct mixed cpumask but silently.
Since set_cpus_allowed_common is under a spinlock, it doesnt add any hints
when it corrects the cpumask.
The third patch returns an error if a user passes a mixed cpumask. Its an
addition to the first patch. However separating it out helps if ever we have
to revert the earlier behaviour. This might cause a change in
sched_setaffinity behaviour when isolcpus is set.
Srikar Dronamraju (3):
sched/core: Warn if cpumask has a mix of isolcpus and housekeeping
CPUs
sched/core: Don't mix isolcpus and housekeeping CPUs
sched/core: Error out if cpumask has a mix of isolcpus and
housekeeping CPUs
kernel/sched/core.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
--
1.8.3.1
next reply other threads:[~2018-10-25 18:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-25 18:42 Srikar Dronamraju [this message]
2018-10-25 18:42 ` [PATCH v3 1/3] sched/core: Warn if cpumask has a mix of isolcpus and housekeeping CPUs Srikar Dronamraju
2018-10-26 8:32 ` Peter Zijlstra
2018-10-25 18:42 ` [PATCH v3 2/3] sched/core: Don't mix " Srikar Dronamraju
2018-10-26 8:33 ` Peter Zijlstra
2018-10-25 18:42 ` [PATCH v3 3/3] sched/core: Error out if cpumask has a mix of " Srikar Dronamraju
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