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From: Florian Weimer <fweimer@redhat.com>
To: "André Almeida" <andrealmeid@collabora.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	"Pierre-Loup A. Griffais" <pgriffais@valvesoftware.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, kernel@collabora.com,
	krisman@collabora.com, shuah@kernel.org,
	linux-kselftest@vger.kernel.org, rostedt@goodmis.org,
	ryao@gentoo.org, dvhart@infradead.org, mingo@redhat.com,
	z.figura12@gmail.com, steven@valvesoftware.com,
	steven@liquorix.net, malteskarupke@web.de, carlos@redhat.com,
	adhemerval.zanella@linaro.org, libc-alpha@sourceware.org,
	linux-api@vger.kernel.org
Subject: Re: 'simple' futex interface [Was: [PATCH v3 1/4] futex: Implement mechanism to wait on any of several futexes]
Date: Thu, 05 Mar 2020 17:25:23 +0100
Message-ID: <87imji7or0.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <52406c54-60b3-dcfe-65d8-4c425459e37b@collabora.com> (=?utf-8?Q?=22Andr=C3=A9?= Almeida"'s message of "Thu, 5 Mar 2020 13:14:17 -0300")

* André Almeida:

> Thanks everyone for the feedback around our mechanism. Are the
> performance benefits of implementing a syscall to wait on a single futex
> significant enough to maintain it instead of just using
> `sys_futex_waitv()` with `nr_waiters = 1`? If we join both cases in a
> single interface, we may even add a new member for NUMA hint in `struct
> futex_wait`.

Some seccomp user might want to verify the address, and that's easier if
it's in an argument.  But that's just a rather minor aspect.

Do you propose to drop the storage requirement for the NUMA hint
next to the futex completely?

Thanks,
Florian


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13 21:45 [PATCH v3 0/4] Implement FUTEX_WAIT_MULTIPLE operation André Almeida
2020-02-13 21:45 ` [PATCH v3 1/4] futex: Implement mechanism to wait on any of several futexes André Almeida
2020-02-28 19:07   ` Peter Zijlstra
2020-02-28 19:49     ` Peter Zijlstra
2020-02-28 21:25       ` Thomas Gleixner
2020-02-29  0:29         ` Pierre-Loup A. Griffais
2020-02-29 10:27           ` Thomas Gleixner
2020-03-03  2:47             ` Pierre-Loup A. Griffais
2020-03-03 12:00               ` 'simple' futex interface [Was: [PATCH v3 1/4] futex: Implement mechanism to wait on any of several futexes] Peter Zijlstra
2020-03-03 13:00                 ` Florian Weimer
2020-03-03 13:21                   ` Peter Zijlstra
2020-03-03 13:47                     ` Florian Weimer
2020-03-03 15:01                       ` Peter Zijlstra
2020-03-05 16:14                         ` André Almeida
2020-03-05 16:25                           ` Florian Weimer [this message]
2020-03-05 18:51                           ` Peter Zijlstra
2020-03-06 16:57                             ` David Laight
2020-02-13 21:45 ` [PATCH v3 2/4] selftests: futex: Add FUTEX_WAIT_MULTIPLE timeout test André Almeida
2020-02-13 21:45 ` [PATCH v3 3/4] selftests: futex: Add FUTEX_WAIT_MULTIPLE wouldblock test André Almeida
2020-02-13 21:45 ` [PATCH v3 4/4] selftests: futex: Add FUTEX_WAIT_MULTIPLE wake up test André Almeida
2020-02-19 16:27 ` [PATCH v3 0/4] Implement FUTEX_WAIT_MULTIPLE operation shuah

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