From: Joel Fernandes <joelagnelf@nvidia.com>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
Tejun Heo <tj@kernel.org>, David Vernet <void@manifault.com>,
Andrea Righi <arighi@nvidia.com>,
Changwoo Min <changwoo@igalia.com>,
bpf@vger.kernel.org
Subject: Re: [PATCH v5 00/14] Add a deadline server for sched_ext tasks
Date: Fri, 20 Jun 2025 16:44:54 -0400 [thread overview]
Message-ID: <a8dc965c-94e8-4941-a292-f14eb76831d9@nvidia.com> (raw)
In-Reply-To: <20250620203234.3349930-1-joelagnelf@nvidia.com>
On 6/20/2025 4:32 PM, Joel Fernandes wrote:
> sched_ext tasks currently are starved by RT hoggers especially since RT
> throttling was replaced by deadline servers to boost only CFS tasks. Several
> users in the community have reported issues with RT stalling sched_ext tasks.
> Add a sched_ext deadline server as well so that sched_ext tasks are also
> boosted and do not suffer starvation.
>
> A kselftest is also provided to verify the starvation issues are now fixed.
>
> Btw, there is still something funky going on with CPU hotplug and the
> relinquish patch. Sometimes the sched_ext's hotplug self-test locks up
> (./runner -t hotplug). Reverting that patch fixes it, so I am suspecting
> something is off in dl_server_remove_params() when it is being called on
> offline CPUs.
Sorry that I forgot to delete this last paragraph. The hotplug issue is
completely fixed now (since v4).
There are no more open issues and all tests on mine and Andrea's side are
looking good now.
Thanks.
next prev parent reply other threads:[~2025-06-20 20:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-20 20:32 [PATCH v5 00/14] Add a deadline server for sched_ext tasks Joel Fernandes
2025-06-20 20:32 ` [PATCH v5 12/14] selftests/sched_ext: Add test for sched_ext dl_server Joel Fernandes
2025-06-20 20:32 ` [PATCH v5 14/14] selftests/sched_ext: Add test for DL server total_bw consistency Joel Fernandes
2025-06-20 20:44 ` Joel Fernandes [this message]
2025-06-23 22:15 ` [PATCH v5 00/14] Add a deadline server for sched_ext tasks Tejun Heo
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