From: Florian Weimer <fweimer@redhat.com>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
linux-kselftest@vger.kernel.org, joel@joelfernandes.org,
"Andrey Semashev" <andrey.semashev@gmail.com>,
kernel@collabora.com, shuah@kernel.org,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Peter Oskolkov" <posk@posk.io>,
corbet@lwn.net, krisman@collabora.com, malteskarupke@fastmail.fm,
"Ingo Molnar" <mingo@redhat.com>,
"Darren Hart" <dvhart@infradead.org>,
acme@kernel.org, "Steven Rostedt" <rostedt@goodmis.org>,
"André Almeida" <andrealmeid@collabora.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
libc-alpha@sourceware.org, linux-api@vger.kernel.org,
z.figura12@gmail.com, "Nicholas Piggin" <npiggin@gmail.com>,
linux-kernel@vger.kernel.org, pgriffais@valvesoftware.com
Subject: Re: [PATCH v4 00/15] Add futex2 syscalls
Date: Tue, 08 Jun 2021 20:19:21 +0200 [thread overview]
Message-ID: <878s3k9q3a.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <74c7f1c1-ca15-1e86-a988-a4d349ad16ef@linaro.org> (Adhemerval Zanella's message of "Tue, 8 Jun 2021 15:08:44 -0300")
* Adhemerval Zanella:
> Also currently we don't have a specific usage. The proposed patch to
> add the 'pthread_mutex_lock_any' and 'pthreada_timedlock_any' [3]
> also did not gave much detail in realword usages or how it can be
> leveraged.
The current rwlock implementation in glibc uses a torn 32-bit futex read
which is part of an atomically updated 64-bit word. That's just really,
really ugly, and I suspect we could make that go away with futex2.
Thanks,
Florian
next prev parent reply other threads:[~2021-06-08 18:19 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-03 19:59 [PATCH v4 00/15] Add futex2 syscalls André Almeida
2021-06-03 19:59 ` [PATCH v4 01/15] futex2: Implement wait and wake functions André Almeida
2021-06-03 19:59 ` [PATCH v4 02/15] futex2: Add support for shared futexes André Almeida
2021-06-03 19:59 ` [PATCH v4 03/15] futex2: Implement vectorized wait André Almeida
2021-06-03 19:59 ` [PATCH v4 04/15] futex2: Implement requeue operation André Almeida
2021-06-03 19:59 ` [PATCH v4 05/15] futex2: Implement support for different futex sizes André Almeida
2021-06-04 0:23 ` kernel test robot
2021-06-06 19:12 ` Davidlohr Bueso
2021-06-06 23:01 ` Andrey Semashev
2021-06-03 19:59 ` [PATCH v4 06/15] futex2: Add compatibility entry point for x86_x32 ABI André Almeida
2021-06-03 19:59 ` [PATCH v4 07/15] docs: locking: futex2: Add documentation André Almeida
2021-06-06 19:23 ` Davidlohr Bueso
2021-06-03 19:59 ` [PATCH v4 08/15] selftests: futex2: Add wake/wait test André Almeida
2021-06-03 19:59 ` [PATCH v4 09/15] selftests: futex2: Add timeout test André Almeida
2021-06-03 19:59 ` [PATCH v4 10/15] selftests: futex2: Add wouldblock test André Almeida
2021-06-03 19:59 ` [PATCH v4 11/15] selftests: futex2: Add waitv test André Almeida
2021-06-03 19:59 ` [PATCH v4 12/15] selftests: futex2: Add requeue test André Almeida
2021-06-03 19:59 ` [PATCH v4 13/15] selftests: futex2: Add futex sizes test André Almeida
2021-06-03 19:59 ` [PATCH v4 14/15] perf bench: Add futex2 benchmark tests André Almeida
2021-06-03 19:59 ` [PATCH v4 15/15] kernel: Enable waitpid() for futex2 André Almeida
2021-06-04 4:51 ` [PATCH v4 00/15] Add futex2 syscalls Zebediah Figura
2021-06-04 17:04 ` André Almeida
2021-06-04 11:36 ` Nicholas Piggin
2021-06-04 20:01 ` André Almeida
2021-06-05 1:09 ` Nicholas Piggin
2021-06-05 8:56 ` Andrey Semashev
2021-06-06 11:57 ` Nicholas Piggin
2021-06-06 13:15 ` Andrey Semashev
2021-06-08 1:25 ` Nicholas Piggin
2021-06-08 11:03 ` Andrey Semashev
2021-06-08 11:13 ` Greg KH
2021-06-08 11:44 ` Peter Zijlstra
2021-06-08 14:31 ` Davidlohr Bueso
2021-06-08 12:06 ` Andrey Semashev
2021-06-08 12:33 ` Greg KH
2021-06-08 12:35 ` Greg KH
2021-06-08 13:18 ` Andrey Semashev
2021-06-08 13:27 ` Greg KH
2021-06-08 13:41 ` Andrey Semashev
2021-06-08 17:06 ` Zebediah Figura
2021-06-08 14:14 ` André Almeida
2021-06-07 15:40 ` André Almeida
2021-06-08 1:31 ` Nicholas Piggin
2021-06-08 2:33 ` Davidlohr Bueso
2021-06-08 4:45 ` Nicholas Piggin
2021-06-08 12:26 ` Sebastian Andrzej Siewior
2021-06-08 14:23 ` Peter Zijlstra
2021-06-08 14:57 ` Sebastian Andrzej Siewior
2021-06-08 15:04 ` André Almeida
2021-06-08 18:08 ` Adhemerval Zanella
2021-06-08 18:19 ` Florian Weimer [this message]
2021-06-08 18:22 ` Adhemerval Zanella
2021-06-09 16:26 ` David Laight
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=878s3k9q3a.fsf@oldenburg.str.redhat.com \
--to=fweimer@redhat.com \
--cc=acme@kernel.org \
--cc=adhemerval.zanella@linaro.org \
--cc=andrealmeid@collabora.com \
--cc=andrey.semashev@gmail.com \
--cc=bigeasy@linutronix.de \
--cc=corbet@lwn.net \
--cc=dave@stgolabs.net \
--cc=dvhart@infradead.org \
--cc=joel@joelfernandes.org \
--cc=kernel@collabora.com \
--cc=krisman@collabora.com \
--cc=libc-alpha@sourceware.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=malteskarupke@fastmail.fm \
--cc=mingo@redhat.com \
--cc=npiggin@gmail.com \
--cc=peterz@infradead.org \
--cc=pgriffais@valvesoftware.com \
--cc=posk@posk.io \
--cc=rostedt@goodmis.org \
--cc=shuah@kernel.org \
--cc=tglx@linutronix.de \
--cc=z.figura12@gmail.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;
as well as URLs for NNTP newsgroup(s).