From: Gilad Ben Yossef <giladb@ezchip.com> To: Andy Lutomirski <luto@amacapital.net>, Chris Metcalf <cmetcalf@ezchip.com> Cc: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, Rik van Riel <riel@redhat.com>, Tejun Heo <tj@kernel.org>, Frederic Weisbecker <fweisbec@gmail.com>, Thomas Gleixner <tglx@linutronix.de>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, Christoph Lameter <cl@linux.com>, Viresh Kumar <viresh.kumar@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>, Linux API <linux-api@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: RE: [PATCH v8 06/14] task_isolation: provide strict mode configurable signal Date: Wed, 21 Oct 2015 06:41:34 +0000 [thread overview] Message-ID: <AM2PR02MB041772AEFFA939F2F8619B36BD380@AM2PR02MB0417.eurprd02.prod.outlook.com> (raw) In-Reply-To: <CALCETrXqDi24EPn79X9SXuz+5sYGZBF3yCRzb8PwdL=YbxVujw@mail.gmail.com> [-- Warning: decoded text below may be mangled, UTF-8 assumed --] [-- Attachment #1: Type: text/plain; charset="utf-8", Size: 2648 bytes --] > From: Andy Lutomirski [mailto:luto@amacapital.net] > Sent: Wednesday, October 21, 2015 4:43 AM > To: Chris Metcalf > Subject: Re: [PATCH v8 06/14] task_isolation: provide strict mode > configurable signal > > On Tue, Oct 20, 2015 at 6:30 PM, Chris Metcalf <cmetcalf@ezchip.com> > wrote: > > On 10/20/2015 8:56 PM, Steven Rostedt wrote: > >> > >> On Tue, 20 Oct 2015 16:36:04 -0400 > >> Chris Metcalf <cmetcalf@ezchip.com> wrote: > >> > >>> Allow userspace to override the default SIGKILL delivered > >>> when a task_isolation process in STRICT mode does a syscall > >>> or otherwise synchronously enters the kernel. > >>> <snip> > > > > It doesn't map SIGKILL to some other signal unconditionally. It just allows > > the "hey, you broke the STRICT contract and entered the kernel" signal > > to be something besides the default SIGKILL. > > > <snip> > > I still dislike this thing. It seems like a debugging feature being > implemented using signals instead of existing APIs. I *still* don't > see why perf can't be used to accomplish your goal. > It is not (just) a debugging feature. There are workloads were not performing an action is much preferred to being late. Consider the following artificial but representative scenario: a task running in strict isolation is controlling a radiotherapy alpha emitter. The code runs in a tight event loop, reading an MMIO register with location data, making some calculation and in response writing an MMIO register that triggers the alpha emitter. As a safety measure, each trigger is for a specific very short time frame - the alpha emitter auto stops. The code has a strict assumption that no more than X cycles pass between reading the value and the response and the system is built in such a way that as long as the code has mastery of the CPU the assumption holds true. If something breaks this assumption (unplanned context switch to kernel), what you want to do is just stop place rather than fire the alpha emitter X nanoseconds too late. This feature lets you say: if the "contract" of isolation is broken, notify/kill me at once. For code where isolation is important, the correctness of a calculation is dependent on timing. It's like you would accept the kernel to kill a task if it read from an unmapped virtual address rather than returning garbage data. With an isolated task, the right data acted on later than you think is garbage just the same. I hope this sheds some light on the issue. Thanks, Gilad ÿôèº{.nÇ+·®+%Ëÿ±éݶ\x17¥wÿº{.nÇ+·¥{±þG«éÿ{ayº\x1dÊÚë,j\a¢f£¢·hïêÿêçz_è®\x03(éÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?¨èÚ&£ø§~á¶iOæ¬z·vØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?I¥
WARNING: multiple messages have this Message-ID (diff)
From: Gilad Ben Yossef <giladb-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org> To: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>, Chris Metcalf <cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org> Cc: Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>, Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, "Paul E. McKenney" <paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>, Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>, Viresh Kumar <viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>, Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>, "linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> Subject: RE: [PATCH v8 06/14] task_isolation: provide strict mode configurable signal Date: Wed, 21 Oct 2015 06:41:34 +0000 [thread overview] Message-ID: <AM2PR02MB041772AEFFA939F2F8619B36BD380@AM2PR02MB0417.eurprd02.prod.outlook.com> (raw) In-Reply-To: <CALCETrXqDi24EPn79X9SXuz+5sYGZBF3yCRzb8PwdL=YbxVujw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> > From: Andy Lutomirski [mailto:luto@amacapital.net] > Sent: Wednesday, October 21, 2015 4:43 AM > To: Chris Metcalf > Subject: Re: [PATCH v8 06/14] task_isolation: provide strict mode > configurable signal > > On Tue, Oct 20, 2015 at 6:30 PM, Chris Metcalf <cmetcalf@ezchip.com> > wrote: > > On 10/20/2015 8:56 PM, Steven Rostedt wrote: > >> > >> On Tue, 20 Oct 2015 16:36:04 -0400 > >> Chris Metcalf <cmetcalf@ezchip.com> wrote: > >> > >>> Allow userspace to override the default SIGKILL delivered > >>> when a task_isolation process in STRICT mode does a syscall > >>> or otherwise synchronously enters the kernel. > >>> <snip> > > > > It doesn't map SIGKILL to some other signal unconditionally. It just allows > > the "hey, you broke the STRICT contract and entered the kernel" signal > > to be something besides the default SIGKILL. > > > <snip> > > I still dislike this thing. It seems like a debugging feature being > implemented using signals instead of existing APIs. I *still* don't > see why perf can't be used to accomplish your goal. > It is not (just) a debugging feature. There are workloads were not performing an action is much preferred to being late. Consider the following artificial but representative scenario: a task running in strict isolation is controlling a radiotherapy alpha emitter. The code runs in a tight event loop, reading an MMIO register with location data, making some calculation and in response writing an MMIO register that triggers the alpha emitter. As a safety measure, each trigger is for a specific very short time frame - the alpha emitter auto stops. The code has a strict assumption that no more than X cycles pass between reading the value and the response and the system is built in such a way that as long as the code has mastery of the CPU the assumption holds true. If something breaks this assumption (unplanned context switch to kernel), what you want to do is just stop place rather than fire the alpha emitter X nanoseconds too late. This feature lets you say: if the "contract" of isolation is broken, notify/kill me at once. For code where isolation is important, the correctness of a calculation is dependent on timing. It's like you would accept the kernel to kill a task if it read from an unmapped virtual address rather than returning garbage data. With an isolated task, the right data acted on later than you think is garbage just the same. I hope this sheds some light on the issue. Thanks, Gilad
next prev parent reply other threads:[~2015-10-21 7:14 UTC|newest] Thread overview: 340+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-05-08 17:58 [PATCH 0/6] support "dataplane" mode for nohz_full Chris Metcalf 2015-05-08 17:58 ` Chris Metcalf 2015-05-08 17:58 ` [PATCH 1/6] nohz_full: add support for "dataplane" mode Chris Metcalf 2015-05-08 17:58 ` Chris Metcalf 2015-05-08 17:58 ` [PATCH 2/6] nohz: dataplane: allow tick to be fully disabled for dataplane Chris Metcalf 2015-05-12 9:26 ` Peter Zijlstra 2015-05-12 13:12 ` Paul E. McKenney 2015-05-14 20:55 ` Chris Metcalf 2015-05-08 17:58 ` [PATCH 3/6] dataplane nohz: run softirqs synchronously on user entry Chris Metcalf 2015-05-09 7:04 ` Mike Galbraith 2015-05-11 20:13 ` Chris Metcalf 2015-05-12 2:21 ` Mike Galbraith 2015-05-12 9:28 ` Peter Zijlstra 2015-05-12 9:32 ` Peter Zijlstra 2015-05-12 13:08 ` Paul E. McKenney 2015-05-08 17:58 ` [PATCH 4/6] nohz: support PR_DATAPLANE_QUIESCE Chris Metcalf 2015-05-08 17:58 ` Chris Metcalf 2015-05-12 9:33 ` Peter Zijlstra 2015-05-12 9:33 ` Peter Zijlstra 2015-05-12 9:50 ` Ingo Molnar 2015-05-12 9:50 ` Ingo Molnar 2015-05-12 10:38 ` Peter Zijlstra 2015-05-12 10:38 ` Peter Zijlstra 2015-05-12 12:52 ` Ingo Molnar 2015-05-13 4:35 ` Andy Lutomirski 2015-05-13 17:51 ` Paul E. McKenney 2015-05-14 20:55 ` Chris Metcalf 2015-05-14 20:55 ` Chris Metcalf 2015-05-14 20:54 ` Chris Metcalf 2015-05-14 20:54 ` Chris Metcalf 2015-05-08 17:58 ` [PATCH 5/6] nohz: support PR_DATAPLANE_STRICT mode Chris Metcalf 2015-05-08 17:58 ` Chris Metcalf 2015-05-09 7:28 ` Andy Lutomirski 2015-05-09 10:37 ` Gilad Ben Yossef 2015-05-09 10:37 ` Gilad Ben Yossef 2015-05-11 19:13 ` Chris Metcalf 2015-05-11 19:13 ` Chris Metcalf 2015-05-11 22:28 ` Andy Lutomirski 2015-05-12 21:06 ` Chris Metcalf 2015-05-12 22:23 ` Andy Lutomirski 2015-05-15 21:25 ` Chris Metcalf 2015-05-12 9:38 ` Peter Zijlstra 2015-05-12 13:20 ` Paul E. McKenney 2015-05-12 13:20 ` Paul E. McKenney 2015-05-08 17:58 ` [PATCH 6/6] nohz: add dataplane_debug boot flag Chris Metcalf 2015-05-08 21:18 ` [PATCH 0/6] support "dataplane" mode for nohz_full Andrew Morton 2015-05-08 21:18 ` Andrew Morton 2015-05-08 21:22 ` Steven Rostedt 2015-05-08 21:22 ` Steven Rostedt 2015-05-08 23:11 ` Chris Metcalf 2015-05-08 23:11 ` Chris Metcalf 2015-05-08 23:19 ` Andrew Morton 2015-05-08 23:19 ` Andrew Morton 2015-05-09 7:05 ` Ingo Molnar 2015-05-09 7:19 ` Andy Lutomirski 2015-05-09 7:19 ` Andy Lutomirski 2015-05-11 19:54 ` Chris Metcalf 2015-05-11 19:54 ` Chris Metcalf 2015-05-11 22:15 ` Andy Lutomirski 2015-05-11 22:15 ` Andy Lutomirski [not found] ` <55510885.9070101@ezchip.com> 2015-05-12 13:18 ` Paul E. McKenney 2015-05-09 7:19 ` Mike Galbraith 2015-05-09 7:19 ` Mike Galbraith 2015-05-09 10:18 ` Gilad Ben Yossef 2015-05-09 10:18 ` Gilad Ben Yossef 2015-05-11 12:57 ` Steven Rostedt 2015-05-11 12:57 ` Steven Rostedt 2015-05-11 15:36 ` Frederic Weisbecker 2015-05-11 19:19 ` Mike Galbraith 2015-05-11 19:25 ` Chris Metcalf 2015-05-11 19:25 ` Chris Metcalf 2015-05-12 1:47 ` Mike Galbraith 2015-05-12 4:35 ` Mike Galbraith 2015-05-15 15:05 ` Chris Metcalf 2015-05-15 18:44 ` Mike Galbraith 2015-05-26 19:51 ` Chris Metcalf 2015-05-27 3:28 ` Mike Galbraith 2015-05-11 17:19 ` Paul E. McKenney 2015-05-11 17:27 ` Andrew Morton 2015-05-11 17:33 ` Frederic Weisbecker 2015-05-11 18:00 ` Steven Rostedt 2015-05-11 18:09 ` Chris Metcalf 2015-05-11 18:09 ` Chris Metcalf 2015-05-11 18:36 ` Steven Rostedt 2015-05-11 18:36 ` Steven Rostedt 2015-05-12 9:10 ` CONFIG_ISOLATION=y (was: [PATCH 0/6] support "dataplane" mode for nohz_full) Ingo Molnar 2015-05-12 11:48 ` Peter Zijlstra 2015-05-12 11:48 ` Peter Zijlstra 2015-05-12 12:34 ` Ingo Molnar 2015-05-12 12:39 ` Peter Zijlstra 2015-05-12 12:39 ` Peter Zijlstra 2015-05-12 12:43 ` Ingo Molnar 2015-05-12 12:43 ` Ingo Molnar 2015-05-12 15:36 ` Frederic Weisbecker 2015-05-12 21:05 ` CONFIG_ISOLATION=y Chris Metcalf 2015-05-12 21:05 ` CONFIG_ISOLATION=y Chris Metcalf 2015-05-12 10:46 ` [PATCH 0/6] support "dataplane" mode for nohz_full Peter Zijlstra 2015-05-12 10:46 ` Peter Zijlstra 2015-05-15 15:10 ` Chris Metcalf 2015-05-15 15:10 ` Chris Metcalf 2015-05-15 21:26 ` [PATCH v2 0/5] support "cpu_isolated" " Chris Metcalf 2015-05-15 21:26 ` Chris Metcalf 2015-05-15 21:27 ` [PATCH v2 1/5] nohz_full: add support for "cpu_isolated" mode Chris Metcalf 2015-05-15 21:27 ` Chris Metcalf 2015-05-15 21:27 ` [PATCH v2 2/5] nohz: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf 2015-05-15 21:27 ` Chris Metcalf 2015-05-15 21:27 ` [PATCH v2 3/5] nohz: cpu_isolated strict mode configurable signal Chris Metcalf 2015-05-15 21:27 ` Chris Metcalf 2015-05-15 21:27 ` [PATCH v2 4/5] nohz: add cpu_isolated_debug boot flag Chris Metcalf 2015-05-15 21:27 ` [PATCH v2 5/5] nohz: cpu_isolated: allow tick to be fully disabled Chris Metcalf 2015-05-15 22:17 ` [PATCH v2 1/5] nohz_full: add support for "cpu_isolated" mode Thomas Gleixner 2015-05-15 22:17 ` Thomas Gleixner 2015-05-28 20:38 ` Chris Metcalf 2015-05-28 20:38 ` Chris Metcalf 2015-06-03 15:29 ` [PATCH v3 0/5] support "cpu_isolated" mode for nohz_full Chris Metcalf 2015-06-03 15:29 ` Chris Metcalf 2015-06-03 15:29 ` [PATCH v3 1/5] nohz_full: add support for "cpu_isolated" mode Chris Metcalf 2015-06-03 15:29 ` Chris Metcalf 2015-06-03 15:29 ` [PATCH v3 2/5] nohz: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf 2015-06-03 15:29 ` Chris Metcalf 2015-06-03 15:29 ` [PATCH v3 3/5] nohz: cpu_isolated strict mode configurable signal Chris Metcalf 2015-06-03 15:29 ` Chris Metcalf 2015-06-03 15:29 ` [PATCH v3 4/5] nohz: add cpu_isolated_debug boot flag Chris Metcalf 2015-06-03 15:29 ` [PATCH v3 5/5] nohz: cpu_isolated: allow tick to be fully disabled Chris Metcalf 2015-07-13 19:57 ` [PATCH v4 0/5] support "cpu_isolated" mode for nohz_full Chris Metcalf 2015-07-13 19:57 ` Chris Metcalf 2015-07-13 19:57 ` [PATCH v4 1/5] nohz_full: add support for "cpu_isolated" mode Chris Metcalf 2015-07-13 19:57 ` Chris Metcalf 2015-07-13 20:40 ` Andy Lutomirski 2015-07-13 21:01 ` Chris Metcalf 2015-07-13 21:45 ` Andy Lutomirski 2015-07-21 19:10 ` Chris Metcalf 2015-07-21 19:26 ` Andy Lutomirski 2015-07-21 20:36 ` Paul E. McKenney 2015-07-21 20:36 ` Paul E. McKenney 2015-07-22 13:57 ` Christoph Lameter 2015-07-22 19:28 ` Paul E. McKenney 2015-07-22 19:28 ` Paul E. McKenney 2015-07-22 20:02 ` Christoph Lameter 2015-07-24 20:21 ` Chris Metcalf 2015-07-24 20:22 ` Chris Metcalf 2015-07-24 14:03 ` Frederic Weisbecker 2015-07-24 20:19 ` Chris Metcalf 2015-07-24 13:27 ` Frederic Weisbecker 2015-07-24 20:21 ` Chris Metcalf 2015-07-24 20:21 ` Chris Metcalf 2015-07-13 19:57 ` [PATCH v4 2/5] nohz: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf 2015-07-13 19:57 ` Chris Metcalf 2015-07-13 21:47 ` Andy Lutomirski 2015-07-13 21:47 ` Andy Lutomirski 2015-07-21 19:34 ` Chris Metcalf 2015-07-21 19:34 ` Chris Metcalf 2015-07-21 19:42 ` Andy Lutomirski 2015-07-21 19:42 ` Andy Lutomirski 2015-07-24 20:29 ` Chris Metcalf 2015-07-13 19:57 ` [PATCH v4 3/5] nohz: cpu_isolated strict mode configurable signal Chris Metcalf 2015-07-13 19:57 ` Chris Metcalf 2015-07-13 19:58 ` [PATCH v4 4/5] nohz: add cpu_isolated_debug boot flag Chris Metcalf 2015-07-13 19:58 ` [PATCH v4 5/5] nohz: cpu_isolated: allow tick to be fully disabled Chris Metcalf 2015-07-28 19:49 ` [PATCH v5 0/6] support "cpu_isolated" mode for nohz_full Chris Metcalf 2015-07-28 19:49 ` Chris Metcalf 2015-07-28 19:49 ` [PATCH v5 1/6] vmstat: provide a function to quiet down the diff processing Chris Metcalf 2015-07-28 19:49 ` [PATCH v5 2/6] cpu_isolated: add initial support Chris Metcalf 2015-07-28 19:49 ` Chris Metcalf 2015-08-12 16:00 ` Frederic Weisbecker 2015-08-12 16:00 ` Frederic Weisbecker 2015-08-12 18:22 ` Chris Metcalf 2015-08-12 18:22 ` Chris Metcalf 2015-08-26 15:26 ` Frederic Weisbecker 2015-08-26 15:26 ` Frederic Weisbecker 2015-08-26 15:55 ` Chris Metcalf 2015-08-26 15:55 ` Chris Metcalf 2015-07-28 19:49 ` [PATCH v5 3/6] cpu_isolated: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf 2015-07-28 19:49 ` Chris Metcalf 2015-07-28 19:49 ` [PATCH v5 4/6] cpu_isolated: provide strict mode configurable signal Chris Metcalf 2015-07-28 19:49 ` Chris Metcalf 2015-07-28 19:49 ` [PATCH v5 5/6] cpu_isolated: add debug boot flag Chris Metcalf 2015-07-28 19:49 ` [PATCH v5 6/6] nohz: cpu_isolated: allow tick to be fully disabled Chris Metcalf 2015-08-25 19:55 ` [PATCH v6 0/6] support "task_isolated" mode for nohz_full Chris Metcalf 2015-08-25 19:55 ` Chris Metcalf 2015-08-25 19:55 ` [PATCH v6 1/6] vmstat: provide a function to quiet down the diff processing Chris Metcalf 2015-08-25 19:55 ` [PATCH v6 2/6] task_isolation: add initial support Chris Metcalf 2015-08-25 19:55 ` Chris Metcalf 2015-08-25 19:55 ` [PATCH v6 3/6] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf 2015-08-25 19:55 ` Chris Metcalf 2015-08-26 10:36 ` Will Deacon 2015-08-26 15:10 ` Chris Metcalf 2015-09-02 10:13 ` Will Deacon 2015-09-02 10:13 ` Will Deacon 2015-08-28 15:31 ` [PATCH v6.1 " Chris Metcalf 2015-08-28 15:31 ` Chris Metcalf 2015-08-25 19:55 ` [PATCH v6 4/6] task_isolation: provide strict mode configurable signal Chris Metcalf 2015-08-25 19:55 ` Chris Metcalf 2015-08-28 19:22 ` Andy Lutomirski 2015-09-02 18:38 ` [PATCH v6.2 3/6] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf 2015-09-02 18:38 ` Chris Metcalf 2015-08-25 19:55 ` [PATCH v6 5/6] task_isolation: add debug boot flag Chris Metcalf 2015-08-25 19:55 ` [PATCH v6 6/6] nohz: task_isolation: allow tick to be fully disabled Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 00/11] support "task_isolated" mode for nohz_full Chris Metcalf 2015-09-28 15:17 ` Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 01/11] vmstat: provide a function to quiet down the diff processing Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 02/11] task_isolation: add initial support Chris Metcalf 2015-09-28 15:17 ` Chris Metcalf 2015-10-01 12:14 ` Frederic Weisbecker 2015-10-01 12:18 ` Thomas Gleixner 2015-10-01 12:23 ` Frederic Weisbecker 2015-10-01 12:31 ` Thomas Gleixner 2015-10-01 17:02 ` Chris Metcalf 2015-10-01 17:02 ` Chris Metcalf 2015-10-01 21:20 ` Thomas Gleixner 2015-10-01 21:20 ` Thomas Gleixner 2015-10-02 17:15 ` Chris Metcalf 2015-10-02 17:15 ` Chris Metcalf 2015-10-02 19:02 ` Thomas Gleixner 2015-10-02 19:02 ` Thomas Gleixner 2015-10-01 19:25 ` Chris Metcalf 2015-10-01 19:25 ` Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 03/11] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf 2015-09-28 15:17 ` Chris Metcalf 2015-09-28 20:51 ` Andy Lutomirski 2015-09-28 20:51 ` Andy Lutomirski 2015-09-28 21:54 ` Chris Metcalf 2015-09-28 22:38 ` Andy Lutomirski 2015-09-29 17:35 ` Chris Metcalf 2015-09-29 17:46 ` Andy Lutomirski 2015-09-29 17:46 ` Andy Lutomirski 2015-09-29 17:57 ` Chris Metcalf 2015-09-29 17:57 ` Chris Metcalf 2015-09-29 18:00 ` Andy Lutomirski 2015-10-01 19:25 ` Chris Metcalf 2015-10-01 19:25 ` Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 04/11] task_isolation: provide strict mode configurable signal Chris Metcalf 2015-09-28 15:17 ` Chris Metcalf 2015-09-28 20:54 ` Andy Lutomirski 2015-09-28 21:54 ` Chris Metcalf 2015-09-28 21:54 ` Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 05/11] task_isolation: add debug boot flag Chris Metcalf 2015-09-28 20:59 ` Andy Lutomirski 2015-09-28 21:55 ` Chris Metcalf 2015-09-28 22:40 ` Andy Lutomirski 2015-09-29 17:35 ` Chris Metcalf 2015-10-05 17:07 ` Luiz Capitulino 2015-10-08 0:33 ` Chris Metcalf 2015-10-08 20:28 ` Luiz Capitulino 2015-09-28 15:17 ` [PATCH v7 06/11] nohz: task_isolation: allow tick to be fully disabled Chris Metcalf 2015-09-28 20:40 ` Andy Lutomirski 2015-10-01 13:07 ` Frederic Weisbecker 2015-10-01 14:13 ` Thomas Gleixner 2015-09-28 15:17 ` [PATCH v7 07/11] arch/x86: enable task isolation functionality Chris Metcalf 2015-09-28 20:59 ` Andy Lutomirski 2015-09-28 21:57 ` Chris Metcalf 2015-09-28 22:43 ` Andy Lutomirski 2015-09-29 17:42 ` Chris Metcalf 2015-09-29 17:57 ` Andy Lutomirski 2015-09-30 20:25 ` Thomas Gleixner 2015-09-30 20:58 ` Chris Metcalf 2015-09-30 22:02 ` Thomas Gleixner 2015-09-30 22:11 ` Andy Lutomirski 2015-10-01 8:12 ` Thomas Gleixner 2015-10-01 9:08 ` Christoph Lameter 2015-10-01 10:10 ` Thomas Gleixner 2015-10-01 19:25 ` Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 08/11] arch/arm64: adopt prepare_exit_to_usermode() model from x86 Chris Metcalf 2015-09-28 15:17 ` Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 09/11] arch/arm64: enable task isolation functionality Chris Metcalf 2015-09-28 15:17 ` Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 10/11] arch/tile: adopt prepare_exit_to_usermode() model from x86 Chris Metcalf 2015-09-28 15:17 ` [PATCH v7 11/11] arch/tile: enable task isolation functionality Chris Metcalf 2015-10-20 20:35 ` [PATCH v8 00/14] support "task_isolation" mode for nohz_full Chris Metcalf 2015-10-20 20:35 ` Chris Metcalf 2015-10-20 20:35 ` [PATCH v8 01/14] vmstat: provide a function to quiet down the diff processing Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 02/14] vmstat: add vmstat_idle function Chris Metcalf 2015-10-20 20:45 ` Christoph Lameter 2015-10-20 20:36 ` [PATCH v8 03/14] lru_add_drain_all: factor out lru_add_drain_needed Chris Metcalf 2015-10-20 20:36 ` Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 04/14] task_isolation: add initial support Chris Metcalf 2015-10-20 20:36 ` Chris Metcalf 2015-10-20 20:56 ` Andy Lutomirski 2015-10-20 21:20 ` Chris Metcalf 2015-10-20 21:20 ` Chris Metcalf 2015-10-20 21:26 ` Andy Lutomirski 2015-10-20 21:26 ` Andy Lutomirski 2015-10-21 0:29 ` Steven Rostedt 2015-10-21 0:29 ` Steven Rostedt 2015-10-26 20:19 ` Chris Metcalf 2015-10-26 21:13 ` Chris Metcalf 2015-10-26 20:32 ` Chris Metcalf 2015-10-21 16:12 ` Frederic Weisbecker 2015-10-21 16:12 ` Frederic Weisbecker 2015-10-27 16:40 ` Chris Metcalf 2015-10-27 16:40 ` Chris Metcalf 2016-01-28 16:38 ` Frederic Weisbecker 2016-01-28 16:38 ` Frederic Weisbecker 2016-02-11 19:58 ` Chris Metcalf 2016-02-11 19:58 ` Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 05/14] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf 2015-10-20 20:36 ` Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 06/14] task_isolation: provide strict mode configurable signal Chris Metcalf 2015-10-20 20:36 ` Chris Metcalf 2015-10-21 0:56 ` Steven Rostedt 2015-10-21 0:56 ` Steven Rostedt 2015-10-21 1:30 ` Chris Metcalf 2015-10-21 1:30 ` Chris Metcalf 2015-10-21 1:41 ` Steven Rostedt 2015-10-21 1:41 ` Steven Rostedt 2015-10-21 1:42 ` Andy Lutomirski 2015-10-21 6:41 ` Gilad Ben Yossef [this message] 2015-10-21 6:41 ` Gilad Ben Yossef 2015-10-21 18:53 ` Andy Lutomirski 2015-10-22 20:44 ` Chris Metcalf 2015-10-22 21:00 ` Andy Lutomirski 2015-10-27 19:37 ` Chris Metcalf 2015-10-27 19:37 ` Chris Metcalf 2015-10-24 9:16 ` Gilad Ben Yossef 2015-10-24 9:16 ` Gilad Ben Yossef 2015-10-20 20:36 ` [PATCH v8 07/14] task_isolation: add debug boot flag Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 08/14] nohz_full: allow disabling the 1Hz minimum tick at boot Chris Metcalf 2015-10-20 21:03 ` Frederic Weisbecker 2015-10-20 21:18 ` Chris Metcalf 2015-10-21 0:59 ` Steven Rostedt 2015-10-21 6:56 ` Gilad Ben Yossef 2015-10-21 14:28 ` Christoph Lameter 2015-10-21 15:35 ` Frederic Weisbecker 2015-10-20 20:36 ` [PATCH v8 09/14] arch/x86: enable task isolation functionality Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 10/14] arch/arm64: adopt prepare_exit_to_usermode() model from x86 Chris Metcalf 2015-10-20 20:36 ` Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 11/14] arch/arm64: enable task isolation functionality Chris Metcalf 2015-10-20 20:36 ` Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 12/14] arch/tile: adopt prepare_exit_to_usermode() model from x86 Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 13/14] arch/tile: turn off timer tick for oneshot_stopped state Chris Metcalf 2015-10-20 20:36 ` [PATCH v8 14/14] arch/tile: enable task isolation functionality Chris Metcalf 2015-10-21 12:39 ` [PATCH v8 00/14] support "task_isolation" mode for nohz_full Peter Zijlstra 2015-10-22 20:31 ` Chris Metcalf 2015-10-22 20:31 ` Chris Metcalf 2015-10-23 2:33 ` Frederic Weisbecker 2015-10-23 8:49 ` Peter Zijlstra 2015-10-23 13:29 ` Frederic Weisbecker 2015-10-23 9:04 ` Peter Zijlstra 2015-10-23 9:04 ` Peter Zijlstra 2015-10-23 11:52 ` Theodore Ts'o
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