From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Ben Maurer <bmaurer@fb.com>,
"Carlos O'Donell" <carlos@redhat.com>,
Florian Weimer <fw@deneb.enyo.de>
Cc: "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 11:35:42 +0000 (UTC) [thread overview]
Message-ID: <14399397.44601.1508412942855.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <515879378.43966.1508350299712.JavaMail.zimbra@efficios.com>
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.
Thoughts ?
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
WARNING: multiple messages have this Message-ID (diff)
From: Mathieu Desnoyers <mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
To: Ben Maurer <bmaurer-b10kYP2dOMg@public.gmane.org>,
Carlos O'Donell <carlos-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Florian Weimer <fw-d32yF4oPJVt0XxTmqZlbVQ@public.gmane.org>
Cc: "Paul E. McKenney"
<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Boqun Feng <boqun.feng-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andrew Hunter <ahh-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Dave Watson <davejwatson-b10kYP2dOMg@public.gmane.org>,
Josh Triplett <josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Andi Kleen <andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org>,
Chris Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Michael
Subject: Re: [RFC PATCH v9 for 4.15 01/14] Restartable sequences system call
Date: Thu, 19 Oct 2017 11:35:42 +0000 (UTC) [thread overview]
Message-ID: <14399397.44601.1508412942855.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <515879378.43966.1508350299712.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
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.
Thoughts ?
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
next prev parent reply other threads:[~2017-10-19 11:33 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 [this message]
2017-10-19 11:35 ` Mathieu Desnoyers
2017-10-19 17:01 ` Florian Weimer
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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