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From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Daniel Colascione <dancol@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Dave Watson <davejwatson@fb.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-api <linux-api@vger.kernel.org>,
	Paul Turner <pjt@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Russell King <linux@arm.linux.org.uk>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Andrew Hunter <ahh@google.com>, Andi Kleen <andi@firstfloor.org>,
	Chris Lameter <cl@linux.com>, Ben Maurer <bmaurer@fb.com>,
	rostedt <rostedt@goodmis.org>,
	Josh Triplett <josh@joshtriplett.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Joel Fernandes <joelaf@google.com>
Subject: Re: [RFC PATCH for 4.18 00/14] Restartable Sequences
Date: Thu, 3 May 2018 14:04:24 -0400 (EDT)	[thread overview]
Message-ID: <702933118.10410.1525370664578.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <CAKOZuetW5NEvbROjuquQ_AxrW7BqR5Qfp6BYfy+zUrnPkZDaTw@mail.gmail.com>

----- On May 3, 2018, at 12:22 PM, Daniel Colascione dancol@google.com wrote:

> On Thu, May 3, 2018 at 9:12 AM Mathieu Desnoyers <
> mathieu.desnoyers@efficios.com> wrote:
>> By the way, if we eventually find a way to enhance user-space mutexes in
> the
>> fashion you describe here, it would belong to another TLS area, and would
>> be registered by another system call than rseq. I proposed a more generic
>> "TLS area registration" system call a few years ago, but Linus told me he
>> wanted a system call that was specific to rseq. If we need to implement
>> other use-cases in a TLS area shared between kernel and user-space in a
>> similar fashion, the plan is to do it in a distinct system call.
> 
> If we proliferate TLS areas; we'd have to register each one upon thread
> creation, adding to the overall thread creation path. There's already a
> provision for versioning the TLS area. What's the benefit of splitting the
> registration over multiple system calls?

See the original discussion thread at

https://lkml.org/lkml/2016/4/7/502

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

WARNING: multiple messages have this Message-ID (diff)
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Daniel Colascione <dancol@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Dave Watson <davejwatson@fb.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-api <linux-api@vger.kernel.org>,
	Paul Turner <pjt@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Russell King <linux@arm.linux.org.uk>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Andrew Hunter <ahh@google.com>, Andi Kleen <andi@firstfloor.org>,
	Chris Lameter <cl@linux.com>, Ben Maurer <bmaurer@fb.com>,
	rostedt <rostedt@goodmis.org>,
	Josh Triplett <josh@joshtriplett.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Catalin Marinas <cata>
Subject: Re: [RFC PATCH for 4.18 00/14] Restartable Sequences
Date: Thu, 3 May 2018 14:04:24 -0400 (EDT)	[thread overview]
Message-ID: <702933118.10410.1525370664578.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <CAKOZuetW5NEvbROjuquQ_AxrW7BqR5Qfp6BYfy+zUrnPkZDaTw@mail.gmail.com>

----- On May 3, 2018, at 12:22 PM, Daniel Colascione dancol@google.com wrote:

> On Thu, May 3, 2018 at 9:12 AM Mathieu Desnoyers <
> mathieu.desnoyers@efficios.com> wrote:
>> By the way, if we eventually find a way to enhance user-space mutexes in
> the
>> fashion you describe here, it would belong to another TLS area, and would
>> be registered by another system call than rseq. I proposed a more generic
>> "TLS area registration" system call a few years ago, but Linus told me he
>> wanted a system call that was specific to rseq. If we need to implement
>> other use-cases in a TLS area shared between kernel and user-space in a
>> similar fashion, the plan is to do it in a distinct system call.
> 
> If we proliferate TLS areas; we'd have to register each one upon thread
> creation, adding to the overall thread creation path. There's already a
> provision for versioning the TLS area. What's the benefit of splitting the
> registration over multiple system calls?

See the original discussion thread at

https://lkml.org/lkml/2016/4/7/502

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

  reply	other threads:[~2018-05-03 18:04 UTC|newest]

Thread overview: 105+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-30 22:44 [RFC PATCH for 4.18 00/14] Restartable Sequences Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 01/14] uapi headers: Provide types_32_64.h (v2) Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 02/14] rseq: Introduce restartable sequences system call (v13) Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-05-16 16:24   ` Peter Zijlstra
2018-05-16 16:24     ` Peter Zijlstra
2018-05-16 20:18     ` Mathieu Desnoyers
2018-05-16 20:18       ` Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 03/14] arm: Add restartable sequences support Mathieu Desnoyers
2018-05-16 16:18   ` Peter Zijlstra
2018-05-16 16:18     ` Peter Zijlstra
2018-05-16 20:13     ` Mathieu Desnoyers
2018-05-16 20:13       ` Mathieu Desnoyers
2018-05-17 13:32       ` Will Deacon
2018-05-17 13:32         ` Will Deacon
2018-05-17 15:30         ` Mathieu Desnoyers
2018-05-17 15:30           ` Mathieu Desnoyers
2018-05-22 18:19           ` Mathieu Desnoyers
2018-05-22 18:19             ` Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 04/14] arm: Wire up restartable sequences system call Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 05/14] x86: Add support for restartable sequences (v2) Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 06/14] x86: Wire up restartable sequence system call Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 07/14] powerpc: Add support for restartable sequences Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-05-16 16:18   ` Peter Zijlstra
2018-05-16 16:18     ` Peter Zijlstra
2018-05-16 20:13     ` Mathieu Desnoyers
2018-05-16 20:13       ` Mathieu Desnoyers
2018-05-17  1:19       ` Boqun Feng
2018-05-17  1:19         ` Boqun Feng
2018-05-17  1:19         ` Boqun Feng
2018-05-17  7:43         ` Peter Zijlstra
2018-05-17  7:43           ` Peter Zijlstra
2018-05-17 15:28         ` Mathieu Desnoyers
2018-05-17 15:28           ` Mathieu Desnoyers
2018-05-17 23:50           ` Boqun Feng
2018-05-17 23:50             ` Boqun Feng
2018-05-18 18:17             ` Mathieu Desnoyers
2018-05-18 18:17               ` Mathieu Desnoyers
2018-05-20 14:08               ` Boqun Feng
2018-05-20 14:08                 ` Boqun Feng
2018-05-20 14:08                 ` Boqun Feng
2018-05-23 20:14                 ` Mathieu Desnoyers
2018-05-23 20:14                   ` Mathieu Desnoyers
2018-05-23 20:46                   ` Paul E. McKenney
2018-05-23 20:46                     ` Paul E. McKenney
2018-05-23 21:29                   ` Mathieu Desnoyers
2018-05-23 21:29                     ` Mathieu Desnoyers
2018-05-24  1:03                     ` Michael Ellerman
2018-05-24  1:03                       ` Michael Ellerman
2018-05-28  7:00                       ` Mathieu Desnoyers
2018-05-28  7:00                         ` Mathieu Desnoyers
2018-05-18 12:38           ` Michael Ellerman
2018-05-18 12:38             ` Michael Ellerman
2018-04-30 22:44 ` [PATCH 08/14] powerpc: Wire up restartable sequences system call Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44 ` [PATCH 09/14] selftests: lib.mk: Introduce OVERRIDE_TARGETS Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` mathieu.desnoyers
2018-04-30 22:44 ` [PATCH 10/14] rseq: selftests: Provide rseq library (v5) Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` mathieu.desnoyers
2018-04-30 22:44 ` [PATCH 11/14] rseq: selftests: Provide basic test Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` mathieu.desnoyers
2018-04-30 22:44 ` [PATCH 12/14] rseq: selftests: Provide basic percpu ops test (v2) Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` mathieu.desnoyers
2018-04-30 22:44 ` [PATCH 13/14] rseq: selftests: Provide parametrized tests (v2) Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` mathieu.desnoyers
2018-04-30 22:44 ` [PATCH 14/14] rseq: selftests: Provide Makefile, scripts, gitignore (v2) Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` Mathieu Desnoyers
2018-04-30 22:44   ` mathieu.desnoyers
2018-05-02  3:53 ` [RFC PATCH for 4.18 00/14] Restartable Sequences Daniel Colascione
2018-05-02  8:43   ` Peter Zijlstra
2018-05-02 16:03   ` Mathieu Desnoyers
2018-05-02 16:03     ` Mathieu Desnoyers
2018-05-02 16:07     ` Daniel Colascione
2018-05-02 16:42       ` Steven Rostedt
2018-05-02 16:55         ` Daniel Colascione
2018-05-03 16:12       ` Mathieu Desnoyers
2018-05-03 16:12         ` Mathieu Desnoyers
2018-05-03 16:22         ` Daniel Colascione
2018-05-03 18:04           ` Mathieu Desnoyers [this message]
2018-05-03 18:04             ` Mathieu Desnoyers
2018-05-03 16:48         ` Joel Fernandes
2018-05-03 17:18           ` Daniel Colascione
2018-05-03 17:46             ` Joel Fernandes
2018-05-03 17:46               ` Joel Fernandes
2018-05-04 22:17               ` Ben Maurer
2018-05-04 22:17                 ` Ben Maurer
2018-05-02 17:22   ` Peter Zijlstra
2018-05-02 18:27     ` Daniel Colascione
2018-05-02 20:22       ` Peter Zijlstra
2018-05-02 20:37         ` Daniel Colascione
2018-05-03  1:15           ` Steven Rostedt
2018-05-03  8:49           ` Peter Zijlstra
2018-05-06 10:03         ` Thomas Gleixner

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