From: Davidlohr Bueso <dave@stgolabs.net>
To: tglx@linutronix.de
Cc: peterz@infradead.org, mingo@kernel.org, rostedt@goodmis.org,
longman@redhat.com, bigeasy@linutronix.de, boqun.feng@gmail.com,
dave@stgolabs.net, linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] locking/rwbase_rt: Use wake_q for lockless reader waker
Date: Wed, 1 Sep 2021 15:28:23 -0700 [thread overview]
Message-ID: <20210901222825.6313-1-dave@stgolabs.net> (raw)
Hi,
Patch 1 does some necessary code reordering.
Patch 2 introduces wake_up_q_state() and converts rwbase_read_unlock()
slowpath to use wake_q instead of holding the wait_lock across the
entire wakeup.
I have tested equivalent changes in the preempt_rt kernel (v5.14.y-rt)
stressing mmap_sem, without anything falling out.
Thanks!
Davidlohr Bueso (2):
sched: Move wake_q code below try_to_wake_up()
locking/rwbase_rt: Lockless reader waking up a writer
kernel/locking/rwbase_rt.c | 4 +-
kernel/sched/core.c | 182 +++++++++++++++++++------------------
2 files changed, 99 insertions(+), 87 deletions(-)
--
2.26.2
next reply other threads:[~2021-09-01 22:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 22:28 Davidlohr Bueso [this message]
2021-09-01 22:28 ` [PATCH 1/2] sched: Move wake_q code below try_to_wake_up() Davidlohr Bueso
2021-09-01 22:28 ` [PATCH 2/2] locking/rwbase_rt: Lockless reader waking up a writer Davidlohr Bueso
2021-09-01 23:03 ` Davidlohr Bueso
2021-09-03 10:55 ` Sebastian Andrzej Siewior
2021-09-13 12:20 ` Thomas Gleixner
2021-09-14 10:42 ` Thomas Gleixner
2021-09-16 17:02 ` Sebastian Andrzej Siewior
2021-09-16 17:27 ` Davidlohr Bueso
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=20210901222825.6313-1-dave@stgolabs.net \
--to=dave@stgolabs.net \
--cc=bigeasy@linutronix.de \
--cc=boqun.feng@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=longman@redhat.com \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
/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®