From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Xuewen Yan <xuewen.yan94@gmail.com>
Cc: "Vincent Guittot" <vincent.guittot@linaro.org>,
"John Stultz" <jstultz@google.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Juri Lelli" <juri.lelli@redhat.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Benjamin Segall" <bsegall@google.com>,
"Mel Gorman" <mgorman@suse.de>,
"Valentin Schneider" <vschneid@redhat.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
"王科 (Ke Wang)" <Ke.Wang@unisoc.com>,
"Xuewen Yan" <xuewen.yan@unisoc.com>,
"hongyu.jin@unisoc.com" <hongyu.jin@unisoc.com>,
guohua.yan@unisoc.com
Subject: Re: [Question] Sched: Severe scheduling latency (>10s) observed on kernel 6.12 with specific workload
Date: Tue, 14 Apr 2026 16:49:11 +0100 [thread overview]
Message-ID: <d814a498-72fd-4ec8-be8c-2cdb5e1f349e@arm.com> (raw)
In-Reply-To: <CAB8ipk_ea+c5__G3vYCsQznzU_CvjdY3SMQEBpv-KXyitSGznw@mail.gmail.com>
On 14.04.26 06:18, Xuewen Yan wrote:
> Thanks Dietmar!
>
> On Fri, Apr 10, 2026 at 7:14 PM Dietmar Eggemann
> <dietmar.eggemann@arm.com> wrote:
>>
>> On 08.04.26 03:50, Xuewen Yan wrote:
>>> Hi Dietmar and Vincent,
[...]
> We tested in Android tree without any vendorhooks.
> Just as John said, after we revert commit 6d71a9c61604 ("sched/fair:
> Fix EEVDF entity
> placement bug causing scheduling lag") in android16-6.12, the latency
> disappeared, because the commit is not exist in stable tree.
>
> On the other hand, we also tested the android17-6.18, without any
> revert, the latency still exist.
So it's not about the wu_lat of the rt-app tasks but the latency values
of the cyclictest tasks?
cyclictest -m -t -a --policy=SCHED_OTHER -b 1000000 -D
120s
[...]
next prev parent reply other threads:[~2026-04-14 15:49 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAB8ipk9N5_pO1Awp6PLnWt6hf1Bu_XtY3qGMJKqz=Uf6eZQejw@mail.gmail.com>
2026-04-01 4:25 ` John Stultz
2026-04-01 6:04 ` Xuewen Yan
2026-04-01 10:05 ` Vincent Guittot
2026-04-01 10:48 ` Xuewen Yan
2026-04-01 13:00 ` Dietmar Eggemann
2026-04-02 5:16 ` Xuewen Yan
2026-04-02 14:58 ` Dietmar Eggemann
2026-04-08 2:50 ` Xuewen Yan
2026-04-10 11:13 ` Dietmar Eggemann
2026-04-14 5:18 ` Xuewen Yan
2026-04-14 15:49 ` Dietmar Eggemann [this message]
2026-04-01 14:01 ` Vincent Guittot
2026-04-02 5:11 ` Xuewen Yan
2026-04-02 5:24 ` Xuewen Yan
2026-04-08 12:19 ` David Laight
2026-04-09 21:39 ` John Stultz
2026-04-10 3:31 ` Xuewen Yan
2026-04-10 4:01 ` John Stultz
2026-04-10 12:24 ` Dietmar Eggemann
2026-04-13 20:44 ` John Stultz
2026-04-14 15:43 ` Dietmar Eggemann
2026-04-14 19:21 ` John Stultz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=d814a498-72fd-4ec8-be8c-2cdb5e1f349e@arm.com \
--to=dietmar.eggemann@arm.com \
--cc=Ke.Wang@unisoc.com \
--cc=bsegall@google.com \
--cc=guohua.yan@unisoc.com \
--cc=hongyu.jin@unisoc.com \
--cc=jstultz@google.com \
--cc=juri.lelli@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=vincent.guittot@linaro.org \
--cc=vschneid@redhat.com \
--cc=xuewen.yan94@gmail.com \
--cc=xuewen.yan@unisoc.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®