From: Peter Zijlstra <peterz@infradead.org>
To: Peter Oskolkov <posk@posk.io>
Cc: Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
juri.lelli@redhat.com,
Vincent Guittot <vincent.guittot@linaro.org>,
dietmar.eggemann@arm.com, Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>,
mgorman@suse.de, bristot@redhat.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-api@vger.kernel.org, x86@kernel.org,
Paul Turner <pjt@google.com>, Peter Oskolkov <posk@google.com>,
Andrei Vagin <avagin@google.com>, Jann Horn <jannh@google.com>,
Thierry Delisle <tdelisle@uwaterloo.ca>
Subject: Re: [RFC][PATCH 0/3] sched: User Managed Concurrency Groups
Date: Wed, 15 Dec 2021 19:25:09 +0100 [thread overview]
Message-ID: <YbozBSLk4PytGp0J@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CAFTs51Xb6m=htpWsVk577n-h_pRCpqRcBg6-OhBav8OadikHkw@mail.gmail.com>
On Wed, Dec 15, 2021 at 09:56:06AM -0800, Peter Oskolkov wrote:
> On Wed, Dec 15, 2021 at 2:06 AM Peter Zijlstra <peterz@infradead.org> wrote:
> > /*
> > + * Enqueue tsk to it's server's runnable list and wake the server for pickup if
> > + * so desired. Notable LAZY workers will not wake the server and rely on the
> > + * server to do pickup whenever it naturally runs next.
>
> No, I never suggested we needed per-server runnable queues: in all my
> patchsets I had a single list of idle (runnable) workers.
This is not about the idle servers..
So without the LAZY thing on, a previously blocked task hitting sys_exit
will enqueue itself on the runnable list and wake the server for pickup.
IIRC you didn't like the server waking while it was still running
another task, but instead preferred to have it pick up the newly
enqueued task when next it ran.
LAZY enables that.. *however* it does need to wake the server when it is
idle, otherwise they'll all sit there waiting for one another.
next prev parent reply other threads:[~2021-12-15 18:25 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-14 20:44 Peter Zijlstra
2021-12-14 20:44 ` [RFC][PATCH 1/3] sched/umcg: add WF_CURRENT_CPU and externise ttwu Peter Zijlstra
2021-12-14 20:44 ` [RFC][PATCH 2/3] x86/uaccess: Implement unsafe_try_cmpxchg_user() Peter Zijlstra
2021-12-20 17:30 ` Sean Christopherson
2021-12-21 11:17 ` Peter Zijlstra
2021-12-14 20:44 ` [RFC][PATCH 3/3] sched: User Mode Concurency Groups Peter Zijlstra
2021-12-21 17:19 ` Peter Oskolkov
2022-01-14 14:09 ` Peter Zijlstra
2022-01-14 15:16 ` Peter Zijlstra
2022-01-14 17:15 ` Peter Zijlstra
2022-01-17 11:35 ` Peter Zijlstra
2022-01-17 12:22 ` Peter Zijlstra
2022-01-17 12:12 ` Peter Zijlstra
2022-01-18 10:09 ` Peter Zijlstra
2022-01-18 18:19 ` Peter Oskolkov
2022-01-19 8:47 ` Peter Zijlstra
2022-01-19 17:33 ` Peter Oskolkov
2022-01-19 8:51 ` Peter Zijlstra
2022-01-19 8:59 ` Peter Zijlstra
2022-01-19 17:52 ` Peter Oskolkov
2022-01-20 10:37 ` Peter Zijlstra
2022-01-17 13:04 ` Peter Zijlstra
2021-12-24 11:27 ` Peter Zijlstra
2021-12-14 21:00 ` [RFC][PATCH 0/3] sched: User Managed Concurrency Groups Peter Zijlstra
2021-12-15 3:46 ` Peter Oskolkov
2021-12-15 10:06 ` Peter Zijlstra
2021-12-15 13:03 ` Peter Zijlstra
2021-12-15 17:56 ` Peter Oskolkov
2021-12-15 18:18 ` Peter Zijlstra
2021-12-15 19:49 ` Peter Oskolkov
2021-12-15 22:25 ` Peter Zijlstra
2021-12-15 23:26 ` Peter Oskolkov
2021-12-16 13:23 ` Thomas Gleixner
2021-12-15 18:25 ` Peter Zijlstra [this message]
2021-12-15 21:04 ` Peter Oskolkov
2021-12-15 23:16 ` Peter Zijlstra
2021-12-15 23:31 ` Peter Oskolkov
2021-12-15 10:44 ` Peter Zijlstra
2021-12-15 13:49 ` Matthew Wilcox
2021-12-15 17:54 ` Peter Zijlstra
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=YbozBSLk4PytGp0J@hirez.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=avagin@google.com \
--cc=bristot@redhat.com \
--cc=bsegall@google.com \
--cc=dietmar.eggemann@arm.com \
--cc=jannh@google.com \
--cc=juri.lelli@redhat.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=pjt@google.com \
--cc=posk@google.com \
--cc=posk@posk.io \
--cc=rostedt@goodmis.org \
--cc=tdelisle@uwaterloo.ca \
--cc=tglx@linutronix.de \
--cc=vincent.guittot@linaro.org \
--cc=x86@kernel.org \
/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