From: Andi Kleen <andi@firstfloor.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
Andi Kleen <andi@firstfloor.org>,
Peter Zijlstra <peterz@infradead.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Boqun Feng <boqun.feng@gmail.com>,
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: Wed, 22 Nov 2017 10:10:29 -0800 [thread overview]
Message-ID: <20171122181028.GM2482@two.firstfloor.org> (raw)
In-Reply-To: <718035530.20074.1511369023901.JavaMail.zimbra@efficios.com>
> > If anyone ever reports that as a problem, I'll gladly fix it in the
> > kernel. That's doable without an ABI change. If rseq-like things
> > started breaking single-stepping, we can't just fix it in the kernel.
AFAIK nobody ever complained about it since we have vsyscalls and vDSOs.
>
> Very true. And rseq does break both line-level and instruction-level
> single-stepping.
They can just set a break point after it and continue.
In fact it could be even expressed to the debugger to do
that automatically based on some dwarf extension.
I also disagree that opv somehow "solves" debugging: it's a completely
different code path that has nothing to do with the original code path.
That's not debugging, that's at best a workaround. I don't think it's
any better than the break point method.
-Andi
next prev parent reply other threads:[~2017-11-22 18:10 UTC|newest]
Thread overview: 66+ 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 ` [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 05/22] x86: Add support for restartable sequences 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 ` [RFC PATCH for 4.15 07/22] powerpc: Add support for restartable sequences 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 ` [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 ` [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 15:17 ` Shuah Khan
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
2017-11-21 15:34 ` Shuah Khan
2017-11-21 17:05 ` Mathieu Desnoyers
2017-11-21 17:40 ` Shuah Khan
2017-11-21 21:22 ` Mathieu Desnoyers
2017-11-21 21:24 ` Shuah Khan
2017-11-21 21:44 ` Mathieu Desnoyers
2017-11-22 19:38 ` Peter Zijlstra
2017-11-23 21:16 ` Mathieu Desnoyers
2017-11-22 21:48 ` Peter Zijlstra
2017-11-23 22:53 ` Mathieu Desnoyers
2017-11-23 8:55 ` Peter Zijlstra
2017-11-23 8:57 ` Peter Zijlstra
2017-11-24 14:15 ` 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 15:39 ` Shuah Khan
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 ` [RFC PATCH for 4.15 18/22] membarrier: selftest: Test private expedited cmd 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 ` [RFC PATCH for 4.15 v5 20/22] membarrier: Document scheduler barrier requirements 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 14:19 ` [RFC PATCH for 4.15 22/22] membarrier: selftest: Test shared expedited cmd 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 22:05 ` Mathieu Desnoyers
2017-11-21 22:59 ` Thomas Gleixner
2017-11-22 12:36 ` Mathieu Desnoyers
2017-11-22 15:25 ` Thomas Gleixner
2017-11-22 15:28 ` Andy Lutomirski
2017-11-22 16:43 ` Mathieu Desnoyers
2017-11-22 18:10 ` Andi Kleen [this message]
2017-11-22 19:32 ` Peter Zijlstra
2017-11-22 19:37 ` Will Deacon
2017-11-23 21:15 ` Mathieu Desnoyers
2017-11-23 22:51 ` Thomas Gleixner
2017-11-23 23:01 ` Mathieu Desnoyers
2017-11-23 23:38 ` Thomas Gleixner
2017-11-24 0:04 ` Mathieu Desnoyers
2017-11-24 14:47 ` Thomas Gleixner
2017-11-23 21:13 ` Mathieu Desnoyers
2017-11-23 21:49 ` Andi Kleen
2017-11-21 22:19 ` [PATCH update for 4.15 1/3] selftests: lib.mk: Introduce OVERRIDE_TARGETS Mathieu Desnoyers
2017-11-21 22:22 ` Mathieu Desnoyers
2017-11-22 15:16 ` Shuah Khan
2017-11-21 22:19 ` [PATCH update for 4.15 2/3] cpu_opv: selftests: Implement selftests (v4) Mathieu Desnoyers
2017-11-22 15:20 ` Shuah Khan
2017-11-21 22:19 ` [PATCH update for 4.15 3/3] rseq: selftests: Provide self-tests (v4) Mathieu Desnoyers
2017-11-22 15:23 ` Shuah Khan
2017-11-22 16:31 ` Mathieu Desnoyers
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