From: Andi Kleen <andi@firstfloor.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andi Kleen <andi@firstfloor.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>, 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
Subject: Re: [RFC PATCH for 4.15 v12 00/22] Restartable sequences and CPU op vector
Date: Thu, 23 Nov 2017 13:49:07 -0800 [thread overview]
Message-ID: <20171123214907.GO2482@two.firstfloor.org> (raw)
In-Reply-To: <2130360737.21248.1511471602798.JavaMail.zimbra@efficios.com>
> Also, turning both line-level and instruction-level single-stepping into
> infinite loops looks pretty much like a new kernel facility that breaks
> user-space. It's a no-go from my point of view.
You could fix it at the debugger level with suitable annotation. Just
turn the whole rseq into an extended line, and make sure it is handled
for instruction stepping too.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <andi@firstfloor.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andi Kleen <andi@firstfloor.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>, 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>
Subject: Re: [RFC PATCH for 4.15 v12 00/22] Restartable sequences and CPU op vector
Date: Thu, 23 Nov 2017 13:49:07 -0800 [thread overview]
Message-ID: <20171123214907.GO2482@two.firstfloor.org> (raw)
In-Reply-To: <2130360737.21248.1511471602798.JavaMail.zimbra@efficios.com>
> Also, turning both line-level and instruction-level single-stepping into
> infinite loops looks pretty much like a new kernel facility that breaks
> user-space. It's a no-go from my point of view.
You could fix it at the debugger level with suitable annotation. Just
turn the whole rseq into an extended line, and make sure it is handled
for instruction stepping too.
-Andi
next prev parent reply other threads:[~2017-11-23 21:49 UTC|newest]
Thread overview: 175+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-21 14:18 [RFC PATCH for 4.15 v12 00/22] Restartable sequences and CPU op vector Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 01/22] uapi headers: Provide types_32_64.h Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 v12 02/22] rseq: Introduce restartable sequences system call Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 03/22] arm: Add restartable sequences support Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 04/22] arm: Wire up restartable sequences system call Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 07/22] powerpc: Add support for restartable sequences Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 08/22] powerpc: Wire up restartable sequences system call Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 09/22] sched: Implement push_task_to_cpu Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 v4 10/22] cpu_opv: Provide cpu_opv system call Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 11/22] x86: Wire up " Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 12/22] powerpc: " Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 13/22] arm: " Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 v3 14/22] cpu_opv: selftests: Implement selftests Mathieu Desnoyers
2017-11-21 14:18 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 14:18 ` mathieu.desnoyers
[not found] ` <20171121141900.18471-15-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-21 15:17 ` Shuah Khan
2017-11-21 15:17 ` Shuah Khan
2017-11-21 15:17 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-21 15:17 ` shuah
[not found] ` <c311cd4b-4d8f-bfb5-3731-2cb2eefa4865-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2017-11-21 16:46 ` Mathieu Desnoyers
2017-11-21 16:46 ` Mathieu Desnoyers
2017-11-21 16:46 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 16:46 ` mathieu.desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 v3 15/22] rseq: selftests: Provide self-tests Mathieu Desnoyers
[not found] ` <20171121141900.18471-16-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-21 15:34 ` Shuah Khan
2017-11-21 15:34 ` Shuah Khan
2017-11-21 17:05 ` Mathieu Desnoyers
2017-11-21 17:05 ` Mathieu Desnoyers
2017-11-21 17:05 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 17:05 ` mathieu.desnoyers
2017-11-21 17:40 ` Shuah Khan
2017-11-21 17:40 ` Shuah Khan
2017-11-21 17:40 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-21 17:40 ` shuah
2017-11-21 21:22 ` Mathieu Desnoyers
2017-11-21 21:22 ` Mathieu Desnoyers
2017-11-21 21:22 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 21:22 ` mathieu.desnoyers
[not found] ` <911090321.19621.1511299340968.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-21 21:24 ` Shuah Khan
2017-11-21 21:24 ` Shuah Khan
2017-11-21 21:24 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-21 21:24 ` shuahkh
[not found] ` <d059d29d-83a7-f16d-dc84-05a4609a3479-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
2017-11-21 21:44 ` Mathieu Desnoyers
2017-11-21 21:44 ` Mathieu Desnoyers
2017-11-21 21:44 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 21:44 ` mathieu.desnoyers
2017-11-22 19:38 ` Peter Zijlstra
2017-11-22 19:38 ` Peter Zijlstra
2017-11-22 19:38 ` [Linux-kselftest-mirror] " Peter Zijlstra
2017-11-22 19:38 ` peterz
[not found] ` <20171122193821.GJ3165-IIpfhp3q70x9+YH6RuovlLjjLBE8jN/0@public.gmane.org>
2017-11-23 21:16 ` Mathieu Desnoyers
2017-11-23 21:16 ` Mathieu Desnoyers
2017-11-23 21:16 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-23 21:16 ` mathieu.desnoyers
2017-11-22 21:48 ` Peter Zijlstra
2017-11-22 21:48 ` Peter Zijlstra
2017-11-22 21:48 ` [Linux-kselftest-mirror] " Peter Zijlstra
2017-11-22 21:48 ` peterz
[not found] ` <20171122214813.GK3165-IIpfhp3q70x9+YH6RuovlLjjLBE8jN/0@public.gmane.org>
2017-11-23 22:53 ` Mathieu Desnoyers
2017-11-23 22:53 ` Mathieu Desnoyers
2017-11-23 22:53 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-23 22:53 ` mathieu.desnoyers
2017-11-23 8:55 ` Peter Zijlstra
2017-11-23 8:55 ` Peter Zijlstra
2017-11-23 8:55 ` [Linux-kselftest-mirror] " Peter Zijlstra
2017-11-23 8:55 ` peterz
[not found] ` <20171123085511.ohwuobf5v32vggho-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2017-11-23 8:57 ` Peter Zijlstra
2017-11-23 8:57 ` Peter Zijlstra
2017-11-23 8:57 ` [Linux-kselftest-mirror] " Peter Zijlstra
2017-11-23 8:57 ` peterz
[not found] ` <20171123085721.bzburngdsatgewjo-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2017-11-24 14:15 ` Mathieu Desnoyers
2017-11-24 14:15 ` Mathieu Desnoyers
2017-11-24 14:15 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-24 14:15 ` mathieu.desnoyers
2017-11-24 13:55 ` Mathieu Desnoyers
2017-11-24 13:55 ` Mathieu Desnoyers
2017-11-24 13:55 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-24 13:55 ` mathieu.desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 16/22] rseq: selftests: arm: workaround gcc asm size guess Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 14:18 ` mathieu.desnoyers
[not found] ` <20171121141900.18471-17-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-21 15:39 ` Shuah Khan
2017-11-21 15:39 ` Shuah Khan
2017-11-21 15:39 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-21 15:39 ` shuah
2017-11-21 14:18 ` [RFC PATCH for 4.15 17/22] Fix: membarrier: add missing preempt off around smp_call_function_many Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 18/22] membarrier: selftest: Test private expedited cmd Mathieu Desnoyers
2017-11-21 14:18 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 14:18 ` mathieu.desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 v7 19/22] powerpc: membarrier: Skip memory barrier in switch_mm() Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 v5 20/22] membarrier: Document scheduler barrier requirements Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 v2 21/22] membarrier: provide SHARED_EXPEDITED command Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:19 ` [RFC PATCH for 4.15 22/22] membarrier: selftest: Test shared expedited cmd Mathieu Desnoyers
2017-11-21 14:19 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 14:19 ` mathieu.desnoyers
2017-11-21 14:19 ` Mathieu Desnoyers
2017-11-21 17:21 ` [RFC PATCH for 4.15 v12 00/22] Restartable sequences and CPU op vector Andi Kleen
2017-11-21 17:21 ` Andi Kleen
[not found] ` <20171121172144.GL2482-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2017-11-21 22:05 ` Mathieu Desnoyers
2017-11-21 22:05 ` Mathieu Desnoyers
[not found] ` <740195164.19702.1511301908907.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-21 22:59 ` Thomas Gleixner
2017-11-21 22:59 ` Thomas Gleixner
2017-11-22 12:36 ` Mathieu Desnoyers
2017-11-22 12:36 ` Mathieu Desnoyers
[not found] ` <809252084.19901.1511354219731.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-22 15:25 ` Thomas Gleixner
2017-11-22 15:25 ` Thomas Gleixner
2017-11-22 19:32 ` Peter Zijlstra
2017-11-22 19:32 ` Peter Zijlstra
2017-11-22 19:37 ` Will Deacon
2017-11-22 19:37 ` Will Deacon
[not found] ` <20171122193734.GO22648-5wv7dgnIgG8@public.gmane.org>
2017-11-23 21:15 ` Mathieu Desnoyers
2017-11-23 21:15 ` Mathieu Desnoyers
[not found] ` <165707648.21250.1511471721845.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-23 22:51 ` Thomas Gleixner
2017-11-23 22:51 ` Thomas Gleixner
2017-11-23 23:01 ` Mathieu Desnoyers
2017-11-23 23:01 ` Mathieu Desnoyers
[not found] ` <739755311.21380.1511478071883.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-23 23:38 ` Thomas Gleixner
2017-11-23 23:38 ` Thomas Gleixner
2017-11-24 0:04 ` Mathieu Desnoyers
2017-11-24 0:04 ` Mathieu Desnoyers
[not found] ` <1589826840.21401.1511481874141.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-24 14:47 ` Thomas Gleixner
2017-11-24 14:47 ` Thomas Gleixner
2017-11-23 21:13 ` Mathieu Desnoyers
2017-11-23 21:13 ` Mathieu Desnoyers
2017-11-23 21:49 ` Andi Kleen [this message]
2017-11-23 21:49 ` Andi Kleen
2017-11-22 15:28 ` Andy Lutomirski
2017-11-22 15:28 ` Andy Lutomirski
[not found] ` <CALCETrX84s-WEa5osP0t6CKh8C4Wj7-ARNMpaSp8Eop1_2ycLA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-22 16:43 ` Mathieu Desnoyers
2017-11-22 16:43 ` Mathieu Desnoyers
[not found] ` <718035530.20074.1511369023901.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-22 18:10 ` Andi Kleen
2017-11-22 18:10 ` Andi Kleen
[not found] ` <20171121141900.18471-1-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-21 14:18 ` [RFC PATCH for 4.15 05/22] x86: Add support for restartable sequences Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 14:18 ` [RFC PATCH for 4.15 06/22] x86: Wire up restartable sequence system call Mathieu Desnoyers
2017-11-21 14:18 ` Mathieu Desnoyers
2017-11-21 22:19 ` [PATCH update for 4.15 1/3] selftests: lib.mk: Introduce OVERRIDE_TARGETS Mathieu Desnoyers
2017-11-21 22:19 ` Mathieu Desnoyers
2017-11-21 22:19 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 22:19 ` mathieu.desnoyers
[not found] ` <20171121221933.25959-1-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-21 22:22 ` Mathieu Desnoyers
2017-11-21 22:22 ` Mathieu Desnoyers
2017-11-21 22:22 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 22:22 ` mathieu.desnoyers
2017-11-22 15:16 ` Shuah Khan
2017-11-22 15:16 ` Shuah Khan
2017-11-22 15:16 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-22 15:16 ` shuah
2017-11-21 22:19 ` [PATCH update for 4.15 2/3] cpu_opv: selftests: Implement selftests (v4) Mathieu Desnoyers
2017-11-21 22:19 ` Mathieu Desnoyers
2017-11-21 22:19 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-21 22:19 ` mathieu.desnoyers
[not found] ` <20171121221933.25959-2-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-22 15:20 ` Shuah Khan
2017-11-22 15:20 ` Shuah Khan
2017-11-22 15:20 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-22 15:20 ` shuah
2017-11-21 22:19 ` [PATCH update for 4.15 3/3] rseq: selftests: Provide self-tests (v4) Mathieu Desnoyers
[not found] ` <20171121221933.25959-3-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-22 15:23 ` Shuah Khan
2017-11-22 15:23 ` Shuah Khan
2017-11-22 15:23 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-22 15:23 ` shuah
2017-11-22 16:31 ` Mathieu Desnoyers
2017-11-22 16:31 ` Mathieu Desnoyers
2017-11-22 16:31 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-22 16:31 ` mathieu.desnoyers
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