linux-kernel - Re: [PATCH 13/14] selftests/sched_ext: Add test for sched_ext dl

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Message-ID: <67335454-6657-42d2-bf98-d1df1b58baa6@arm.com>
Date: Mon, 20 Oct 2025 14:26:17 +0100
From: Christian Loehle <christian.loehle@....com>
To: Andrea Righi <arighi@...dia.com>, Ingo Molnar <mingo@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Joel Fernandes <joelagnelf@...dia.com>, Tejun Heo <tj@...nel.org>,
 David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
 Shuah Khan <shuah@...nel.org>
Cc: sched-ext@...ts.linux.dev, bpf@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/14] selftests/sched_ext: Add test for sched_ext
 dl_server

On 10/17/25 10:26, Andrea Righi wrote:
> Add a selftest to validate the correct behavior of the deadline server
> for the ext_sched_class.
> 
> [ Joel: Replaced occurences of CFS in the test with EXT. ]
> 
> Co-developed-by: Joel Fernandes <joelagnelf@...dia.com>
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> Signed-off-by: Andrea Righi <arighi@...dia.com>
> ---
>  tools/testing/selftests/sched_ext/Makefile    |   1 +
>  .../selftests/sched_ext/rt_stall.bpf.c        |  23 ++
>  tools/testing/selftests/sched_ext/rt_stall.c  | 214 ++++++++++++++++++
>  3 files changed, 238 insertions(+)
>  create mode 100644 tools/testing/selftests/sched_ext/rt_stall.bpf.c
>  create mode 100644 tools/testing/selftests/sched_ext/rt_stall.c


Does this pass consistently for you?
For a loop of 1000 runs I'm getting total runtime numbers for the EXT task of:

   0.000 -    0.261 |  (7)
   0.261 -    0.522 | ###### (86)
   0.522 -    4.437 |  (0)
   4.437 -    4.698 |  (1)
   4.698 -    4.959 | ################### (257)
   4.959 -    5.220 | ################################################## (649)

I'll try to see what's going wrong here...