From: Andi Kleen <andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org>
To: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: Andi Kleen <andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org>,
Mathieu Desnoyers
<mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
"Paul E. McKenney"
<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Boqun Feng <boqun.feng-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Dave Watson <davejwatson-b10kYP2dOMg@public.gmane.org>,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-api <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Andrew Hunter <ahh-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Chris Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
Ben Maurer <bmaurer-b10kYP2dOMg@public.gmane.org>,
rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
Josh Triplett <josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Subject: Re: [RFC PATCH v3 for 4.15 08/24] Provide cpu_opv system call
Date: Fri, 17 Nov 2017 11:15:47 -0800 [thread overview]
Message-ID: <20171117191547.GI2482@two.firstfloor.org> (raw)
In-Reply-To: <alpine.DEB.2.20.1711171922420.2186@nanos>
> The most straight forward is to have a mechanism which forces everything
> into the slow path in case of debugging, lack of progress, etc. The slow
That's the abort address, right?
For the generic case the fall back path would require disabling preemption
unfortunately, for which we don't have a mechanism in user space.
I think that is what Mathieu tried to implement here with this call.
There may be some special cases where it's possible without preemption
control, e.g. a malloc could just not use the per cpu cache. But I doubt
that is possible in all cases that Mathieu envisions.
But again would be a different code path, and I question the need for it when
we can just let the operator of the debugger deal with it.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <andi@firstfloor.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
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>,
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 v3 for 4.15 08/24] Provide cpu_opv system call
Date: Fri, 17 Nov 2017 11:15:47 -0800 [thread overview]
Message-ID: <20171117191547.GI2482@two.firstfloor.org> (raw)
In-Reply-To: <alpine.DEB.2.20.1711171922420.2186@nanos>
> The most straight forward is to have a mechanism which forces everything
> into the slow path in case of debugging, lack of progress, etc. The slow
That's the abort address, right?
For the generic case the fall back path would require disabling preemption
unfortunately, for which we don't have a mechanism in user space.
I think that is what Mathieu tried to implement here with this call.
There may be some special cases where it's possible without preemption
control, e.g. a malloc could just not use the per cpu cache. But I doubt
that is possible in all cases that Mathieu envisions.
But again would be a different code path, and I question the need for it when
we can just let the operator of the debugger deal with it.
-Andi
next prev parent reply other threads:[~2017-11-17 19:15 UTC|newest]
Thread overview: 174+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-14 20:03 [RFC PATCH for 4.15 00/24] Restartable sequences and CPU op vector v11 Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
2017-11-14 20:03 ` [RFC PATCH for 4.15 03/24] Restartable sequences: wire up ARM 32 system call Mathieu Desnoyers
2017-11-14 20:03 ` [RFC PATCH for 4.15 07/24] Restartable sequences: Wire up powerpc " Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
[not found] ` <20171114200414.2188-1-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-14 20:03 ` [RFC PATCH v11 for 4.15 01/24] Restartable sequences " Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
[not found] ` <CY4PR15MB168884529B3C0F8E6CC06257CF280@CY4PR15MB1688.namprd15.prod.outlook.com>
[not found] ` <CY4PR15MB168884529B3C0F8E6CC06257CF280-ZVJ2su15u+xeX4ZvlgGe+Yd3EbNNOtPMvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-11-14 20:49 ` Ben Maurer
2017-11-14 20:49 ` Ben Maurer
[not found] ` <CY4PR15MB1688CE0F2139CEB72B467242CF280-ZVJ2su15u+xeX4ZvlgGe+Yd3EbNNOtPMvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-11-14 21:03 ` Mathieu Desnoyers
2017-11-14 21:03 ` Mathieu Desnoyers
2017-11-16 19:14 ` Peter Zijlstra
2017-11-16 19:14 ` Peter Zijlstra
[not found] ` <20171116191448.rmds347hwsyibipm-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2017-11-16 20:37 ` Mathieu Desnoyers
2017-11-16 20:37 ` Mathieu Desnoyers
[not found] ` <1083699948.16848.1510864678185.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-16 20:46 ` Peter Zijlstra
2017-11-16 20:46 ` Peter Zijlstra
[not found] ` <20171114200414.2188-2-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-14 20:39 ` Ben Maurer
2017-11-14 20:39 ` Ben Maurer
[not found] ` <CY4PR15MB168866BFDCFECF81B7EF4CF1CF280-ZVJ2su15u+xeX4ZvlgGe+Yd3EbNNOtPMvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-11-14 20:52 ` Mathieu Desnoyers
2017-11-14 20:52 ` Mathieu Desnoyers
[not found] ` <574606484.15158.1510692743725.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-14 21:48 ` Ben Maurer
2017-11-14 21:48 ` Ben Maurer
2017-11-16 16:18 ` Peter Zijlstra
2017-11-16 16:18 ` Peter Zijlstra
[not found] ` <20171116161815.dg4hi2z35rkh4u4s-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2017-11-16 16:27 ` Mathieu Desnoyers
2017-11-16 16:27 ` Mathieu Desnoyers
[not found] ` <438349693.16595.1510849627973.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-16 16:32 ` Peter Zijlstra
2017-11-16 16:32 ` Peter Zijlstra
[not found] ` <20171116163218.fg4u4bbzfrbxatvz-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2017-11-16 17:09 ` Mathieu Desnoyers
2017-11-16 17:09 ` Mathieu Desnoyers
2017-11-16 18:43 ` Peter Zijlstra
2017-11-16 18:43 ` Peter Zijlstra
[not found] ` <20171116184305.snpudnjdhua2obby-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2017-11-16 18:49 ` Mathieu Desnoyers
2017-11-16 18:49 ` Mathieu Desnoyers
[not found] ` <1523632942.16739.1510858189882.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-16 19:06 ` Thomas Gleixner
2017-11-16 19:06 ` Thomas Gleixner
2017-11-16 20:06 ` Mathieu Desnoyers
2017-11-16 20:06 ` Mathieu Desnoyers
2017-11-16 21:08 ` Thomas Gleixner
2017-11-16 21:08 ` Thomas Gleixner
2017-11-19 17:24 ` Mathieu Desnoyers
2017-11-19 17:24 ` Mathieu Desnoyers
2017-11-14 20:03 ` [RFC PATCH for 4.15 02/24] Restartable sequences: ARM 32 architecture support Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
2017-11-14 20:03 ` [RFC PATCH for 4.15 04/24] Restartable sequences: x86 32/64 " Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
[not found] ` <20171114200414.2188-5-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-16 21:14 ` Thomas Gleixner
2017-11-16 21:14 ` Thomas Gleixner
2017-11-19 17:41 ` Mathieu Desnoyers
2017-11-19 17:41 ` Mathieu Desnoyers
[not found] ` <1390396579.17843.1511113291117.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-20 8:38 ` Thomas Gleixner
2017-11-20 8:38 ` Thomas Gleixner
2017-11-14 20:03 ` [RFC PATCH for 4.15 05/24] Restartable sequences: wire up x86 32/64 system call Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
2017-11-14 20:03 ` [RFC PATCH for 4.15 06/24] Restartable sequences: powerpc architecture support Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
2017-11-14 20:03 ` [RFC PATCH v3 for 4.15 08/24] Provide cpu_opv system call Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
[not found] ` <20171114200414.2188-9-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-15 1:34 ` Mathieu Desnoyers
2017-11-15 1:34 ` Mathieu Desnoyers
2017-11-15 7:44 ` Michael Kerrisk (man-pages)
2017-11-15 7:44 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkjrh_OMi+7EUJxqM0-84WUxL0d_vse4neOL93EB-sGKXw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-15 14:30 ` Mathieu Desnoyers
2017-11-15 14:30 ` Mathieu Desnoyers
2017-11-16 23:26 ` Thomas Gleixner
2017-11-16 23:26 ` Thomas Gleixner
2017-11-17 0:14 ` Andi Kleen
2017-11-17 0:14 ` Andi Kleen
[not found] ` <20171117001410.GG2482-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2017-11-17 10:09 ` Thomas Gleixner
2017-11-17 10:09 ` Thomas Gleixner
2017-11-17 17:14 ` Mathieu Desnoyers
2017-11-17 17:14 ` Mathieu Desnoyers
[not found] ` <1756446476.17265.1510938872121.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-17 18:18 ` Andi Kleen
2017-11-17 18:18 ` Andi Kleen
[not found] ` <20171117181839.GH2482-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2017-11-17 18:59 ` Thomas Gleixner
2017-11-17 18:59 ` Thomas Gleixner
2017-11-17 19:15 ` Andi Kleen [this message]
2017-11-17 19:15 ` Andi Kleen
[not found] ` <20171117191547.GI2482-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2017-11-17 20:07 ` Thomas Gleixner
2017-11-17 20:07 ` Thomas Gleixner
2017-11-18 21:09 ` Andy Lutomirski
2017-11-18 21:09 ` Andy Lutomirski
2017-11-17 20:22 ` Thomas Gleixner
2017-11-17 20:22 ` Thomas Gleixner
2017-11-20 17:13 ` Mathieu Desnoyers
2017-11-20 17:13 ` Mathieu Desnoyers
2017-11-20 16:13 ` Mathieu Desnoyers
2017-11-20 16:13 ` Mathieu Desnoyers
[not found] ` <1766414702.18278.1511194398489.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-20 17:48 ` Thomas Gleixner
2017-11-20 17:48 ` Thomas Gleixner
2017-11-20 18:03 ` Thomas Gleixner
2017-11-20 18:03 ` Thomas Gleixner
2017-11-20 18:42 ` Mathieu Desnoyers
2017-11-20 18:42 ` Mathieu Desnoyers
2017-11-20 18:39 ` Mathieu Desnoyers
2017-11-20 18:39 ` Mathieu Desnoyers
[not found] ` <204285712.18480.1511203151076.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-20 18:49 ` Andi Kleen
2017-11-20 18:49 ` Andi Kleen
[not found] ` <20171120184927.GK2482-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2017-11-20 22:46 ` Mathieu Desnoyers
2017-11-20 22:46 ` Mathieu Desnoyers
2017-11-20 19:44 ` Thomas Gleixner
2017-11-20 19:44 ` Thomas Gleixner
2017-11-21 11:25 ` Mathieu Desnoyers
2017-11-21 11:25 ` Mathieu Desnoyers
2017-11-14 20:03 ` [RFC PATCH for 4.15 09/24] cpu_opv: Wire up x86 32/64 " Mathieu Desnoyers
2017-11-14 20:03 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH v2 for 4.15 12/24] cpu_opv: Implement selftests Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-14 20:04 ` mathieu.desnoyers
2017-11-14 20:04 ` [RFC PATCH v2 for 4.15 13/24] Restartable sequences: Provide self-tests Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH for 4.15 14/24] Restartable sequences selftests: arm: workaround gcc asm size guess Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-14 20:04 ` mathieu.desnoyers
2017-11-14 20:04 ` [RFC PATCH v5 for 4.15 17/24] membarrier: Document scheduler barrier requirements Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 21:08 ` [RFC PATCH for 4.15 00/24] Restartable sequences and CPU op vector v11 Linus Torvalds
2017-11-14 21:08 ` Linus Torvalds
[not found] ` <CA+55aFzZcQKEvu5S3TwD9MscqDhqq3pKa0Kam79NncjP8RnvoQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-14 21:15 ` Andy Lutomirski
2017-11-14 21:15 ` Andy Lutomirski
[not found] ` <CALCETrVMvk0dsBMF8F-gPZCGnfJt=RQOvTnVzJhVaAFhEFbq2w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-14 21:32 ` Paul Turner
2017-11-14 21:32 ` Paul Turner
2018-03-27 18:15 ` Mathieu Desnoyers
2018-03-27 18:15 ` Mathieu Desnoyers
2017-11-14 21:32 ` Mathieu Desnoyers
2017-11-14 21:32 ` Mathieu Desnoyers
[not found] ` <2115146800.15215.1510695175687.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-15 4:12 ` Andy Lutomirski
2017-11-15 4:12 ` Andy Lutomirski
[not found] ` <CALCETrX4dzY_kyZmqR+srKZf7vVYzODH5i9bguFAzdm0dcU3ZQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-15 6:34 ` Mathieu Desnoyers
2017-11-15 6:34 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH for 4.15 10/24] cpu_opv: Wire up powerpc system call Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH for 4.15 11/24] cpu_opv: Wire up ARM32 " Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH v2 for 4.15 15/24] membarrier: selftest: Test private expedited cmd Mathieu Desnoyers
2017-11-14 20:04 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-14 20:04 ` mathieu.desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH v7 for 4.15 16/24] membarrier: powerpc: Skip memory barrier in switch_mm() Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH for 4.15 18/24] membarrier: provide SHARED_EXPEDITED command Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
[not found] ` <20171114200414.2188-19-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-15 1:36 ` Mathieu Desnoyers
2017-11-15 1:36 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH for 4.15 19/24] membarrier: selftest: Test shared expedited cmd Mathieu Desnoyers
2017-11-14 20:04 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-14 20:04 ` mathieu.desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
[not found] ` <20171114200414.2188-20-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2017-11-17 15:07 ` Shuah Khan
2017-11-17 15:07 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-17 15:07 ` shuahkh
2017-11-17 15:07 ` Shuah Khan
2017-11-14 20:04 ` [RFC PATCH for 4.15 20/24] membarrier: Provide core serializing command Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH v2 for 4.15 21/24] x86: Introduce sync_core_before_usermode Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH v2 for 4.15 22/24] membarrier: x86: Provide core serializing command Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH for 4.15 23/24] membarrier: selftest: Test private expedited sync core cmd Mathieu Desnoyers
2017-11-14 20:04 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-14 20:04 ` mathieu.desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
2017-11-17 15:09 ` Shuah Khan
2017-11-17 15:09 ` [Linux-kselftest-mirror] " Shuah Khan
2017-11-17 15:09 ` shuahkh
2017-11-17 15:09 ` Shuah Khan
2017-11-17 16:17 ` Mathieu Desnoyers
2017-11-17 16:17 ` [Linux-kselftest-mirror] " Mathieu Desnoyers
2017-11-17 16:17 ` mathieu.desnoyers
2017-11-17 16:17 ` Mathieu Desnoyers
2017-11-14 20:04 ` [RFC PATCH for 4.15 24/24] membarrier: arm64: Provide core serializing command Mathieu Desnoyers
2017-11-14 20:04 ` Mathieu Desnoyers
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