From: Florian Weimer <fw@deneb.enyo.de>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Ben Maurer <bmaurer@fb.com>,
"Carlos O'Donell" <carlos@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Boqun Feng <boqun.feng@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Paul Turner <pjt@google.com>, Andrew Hunter <ahh@google.com>,
Andy Lutomirski <luto@amacapital.net>,
Dave Watson <davejwatson@fb.com>,
Josh Triplett <josh@joshtriplett.org>,
Will Deacon <will.deacon@arm.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Andi Kleen <andi@firstfloor.org>, Chris Lameter <cl@linux.com>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Russell King <linux@arm.linux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-api <linux-api@vger.kernel.org>
Subject: Re: [RFC PATCH v9 for 4.15 01/14] Restartable sequences system call
Date: Thu, 19 Oct 2017 19:01:52 +0200 [thread overview]
Message-ID: <87efpz2hrz.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <14399397.44601.1508412942855.JavaMail.zimbra@efficios.com> (Mathieu Desnoyers's message of "Thu, 19 Oct 2017 11:35:42 +0000 (UTC)")
* Mathieu Desnoyers:
> Speaking of optimization, I think the rseq.c helper library
> (and eventually glibc) should define the __rseq_abi TLS
> variable with __attribute__((tls_model("initial-exec"))).
> It provides faster, and signal-safe, accesses to the TLS
> variable from libraries.
>
> The idea you were suggesting where the application could
> override the glibc symbol with its own just ends up enforcing
> an initial-exec model, but it looks like we can do this
> directly from the library.
This really depends on how the programming model turns out once
multiple libraries are involved. I think it's premature to discuss
such details.
WARNING: multiple messages have this Message-ID (diff)
From: Florian Weimer <fw@deneb.enyo.de>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Ben Maurer <bmaurer@fb.com>, Carlos O'Donell <carlos@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Boqun Feng <boqun.feng@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Paul Turner <pjt@google.com>, Andrew Hunter <ahh@google.com>,
Andy Lutomirski <luto@amacapital.net>,
Dave Watson <davejwatson@fb.com>,
Josh Triplett <josh@joshtriplett.org>,
Will Deacon <will.deacon@arm.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Andi Kleen <andi@firstfloor.org>, Chris Lameter <cl@linux.com>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Russell King <linux@arm.linux.org.u>
Subject: Re: [RFC PATCH v9 for 4.15 01/14] Restartable sequences system call
Date: Thu, 19 Oct 2017 19:01:52 +0200 [thread overview]
Message-ID: <87efpz2hrz.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <14399397.44601.1508412942855.JavaMail.zimbra@efficios.com> (Mathieu Desnoyers's message of "Thu, 19 Oct 2017 11:35:42 +0000 (UTC)")
* Mathieu Desnoyers:
> Speaking of optimization, I think the rseq.c helper library
> (and eventually glibc) should define the __rseq_abi TLS
> variable with __attribute__((tls_model("initial-exec"))).
> It provides faster, and signal-safe, accesses to the TLS
> variable from libraries.
>
> The idea you were suggesting where the application could
> override the glibc symbol with its own just ends up enforcing
> an initial-exec model, but it looks like we can do this
> directly from the library.
This really depends on how the programming model turns out once
multiple libraries are involved. I think it's premature to discuss
such details.
next prev parent reply other threads:[~2017-10-19 17:12 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-12 23:03 [RFC PATCH v9 for 4.15 00/14] Restartable sequences and CPU op vector system calls Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH v9 for 4.15 01/14] Restartable sequences system call Mathieu Desnoyers
2017-10-13 0:36 ` Linus Torvalds
2017-10-13 0:36 ` Linus Torvalds
2017-10-13 9:35 ` Ben Maurer
2017-10-13 9:35 ` Ben Maurer
2017-10-13 18:30 ` Linus Torvalds
2017-10-13 18:30 ` Linus Torvalds
2017-10-13 20:54 ` Paul E. McKenney
2017-10-13 20:54 ` Paul E. McKenney
2017-10-13 21:05 ` Linus Torvalds
2017-10-13 21:05 ` Linus Torvalds
2017-10-13 21:21 ` Paul E. McKenney
2017-10-13 21:21 ` Paul E. McKenney
2017-10-13 21:36 ` Mathieu Desnoyers
2017-10-13 21:36 ` Mathieu Desnoyers
2017-10-16 16:04 ` Carlos O'Donell
2017-10-16 16:04 ` Carlos O'Donell
2017-10-16 16:46 ` Andi Kleen
2017-10-16 16:46 ` Andi Kleen
2017-10-16 22:17 ` Mathieu Desnoyers
2017-10-16 22:17 ` Mathieu Desnoyers
2017-10-17 16:19 ` Ben Maurer
2017-10-17 16:19 ` Ben Maurer
2017-10-17 16:33 ` Mathieu Desnoyers
2017-10-17 16:33 ` Mathieu Desnoyers
2017-10-17 16:41 ` Ben Maurer
2017-10-17 16:41 ` Ben Maurer
2017-10-17 17:48 ` Mathieu Desnoyers
2017-10-17 17:48 ` Mathieu Desnoyers
2017-10-18 6:22 ` Greg KH
2017-10-18 6:22 ` Greg KH
2017-10-18 16:28 ` Mathieu Desnoyers
2017-10-18 16:28 ` Mathieu Desnoyers
2017-10-14 3:01 ` Andi Kleen
2017-10-14 3:01 ` Andi Kleen
2017-10-14 4:05 ` Linus Torvalds
2017-10-14 4:05 ` Linus Torvalds
2017-10-14 11:37 ` Mathieu Desnoyers
2017-10-14 11:37 ` Mathieu Desnoyers
2017-10-13 12:50 ` Florian Weimer
2017-10-13 13:40 ` Mathieu Desnoyers
2017-10-13 13:40 ` Mathieu Desnoyers
2017-10-13 13:56 ` Florian Weimer
2017-10-13 13:56 ` Florian Weimer
2017-10-13 14:27 ` Mathieu Desnoyers
2017-10-13 14:27 ` Mathieu Desnoyers
2017-10-13 17:24 ` Andy Lutomirski
2017-10-13 17:24 ` Andy Lutomirski
2017-10-13 17:53 ` Florian Weimer
2017-10-13 17:53 ` Florian Weimer
2017-10-13 18:17 ` Andy Lutomirski
2017-10-13 18:17 ` Andy Lutomirski
2017-10-14 11:53 ` Mathieu Desnoyers
2017-10-14 11:53 ` Mathieu Desnoyers
2017-10-18 16:41 ` Ben Maurer
2017-10-18 18:11 ` Mathieu Desnoyers
2017-10-18 18:11 ` Mathieu Desnoyers
2017-10-19 11:35 ` Mathieu Desnoyers
2017-10-19 11:35 ` Mathieu Desnoyers
2017-10-19 17:01 ` Florian Weimer [this message]
2017-10-19 17:01 ` Florian Weimer
2017-10-23 17:30 ` Ben Maurer
2017-10-23 17:30 ` Ben Maurer
2017-10-23 20:44 ` Mathieu Desnoyers
2017-10-23 20:44 ` Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 02/14] tracing: instrument restartable sequences Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 03/14] Restartable sequences: ARM 32 architecture support Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 04/14] Restartable sequences: wire up ARM 32 system call Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 05/14] Restartable sequences: x86 32/64 architecture support Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 06/14] Restartable sequences: wire up x86 32/64 system call Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 07/14] Restartable sequences: powerpc architecture support Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 08/14] Restartable sequences: Wire up powerpc system call Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 09/14] Provide cpu_opv " Mathieu Desnoyers
2017-10-13 13:57 ` Alan Cox
2017-10-13 13:57 ` Alan Cox
2017-10-13 14:50 ` Mathieu Desnoyers
2017-10-13 14:50 ` Mathieu Desnoyers
2017-10-14 14:22 ` Mathieu Desnoyers
2017-10-14 14:22 ` Mathieu Desnoyers
2017-10-13 17:20 ` Andy Lutomirski
2017-10-13 17:20 ` Andy Lutomirski
2017-10-14 2:50 ` Andi Kleen
2017-10-14 2:50 ` Andi Kleen
2017-10-14 13:35 ` Mathieu Desnoyers
2017-10-14 13:35 ` Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 10/14] cpu_opv: Wire up x86 32/64 " Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 11/14] cpu_opv: Wire up powerpc " Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 12/14] cpu_opv: Wire up ARM32 " Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 13/14] cpu_opv: Implement selftests Mathieu Desnoyers
2017-10-12 23:03 ` [RFC PATCH for 4.15 14/14] Restartable sequences: Provide self-tests Mathieu Desnoyers
2017-10-16 2:51 ` Michael Ellerman
2017-10-16 2:51 ` Michael Ellerman
2017-10-16 14:23 ` Mathieu Desnoyers
2017-10-16 14:23 ` Mathieu Desnoyers
2017-10-17 10:38 ` Michael Ellerman
2017-10-17 10:38 ` Michael Ellerman
2017-10-17 13:50 ` Mathieu Desnoyers
2017-10-17 13:50 ` Mathieu Desnoyers
2017-10-16 18:50 ` Mathieu Desnoyers
2017-10-16 18:50 ` Mathieu Desnoyers
2017-10-17 10:36 ` Michael Ellerman
2017-10-17 10:36 ` Michael Ellerman
2017-10-17 13:50 ` Mathieu Desnoyers
2017-10-17 13:50 ` Mathieu Desnoyers
2017-10-18 5:45 ` Michael Ellerman
2017-10-18 5:45 ` Michael Ellerman
2017-10-16 3:00 ` Michael Ellerman
2017-10-16 3:00 ` Michael Ellerman
2017-10-16 3:48 ` Boqun Feng
2017-10-16 3:48 ` Boqun Feng
2017-10-16 11:48 ` Michael Ellerman
2017-10-16 11:48 ` Michael Ellerman
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