From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@amacapital.net>,
Chris Metcalf <cmetcalf@mellanox.com>,
Thomas Gleixner <tglx@linutronix.de>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
Christoph Lameter <cl@linux.com>, Michal Hocko <mhocko@suse.com>,
Gilad Ben Yossef <giladb@mellanox.com>,
Andrew Morton <akpm@linux-foundation.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Linux API <linux-api@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@kernel.org>, Tejun Heo <tj@kernel.org>,
Rik van Riel <riel@redhat.com>, Will Deacon <will.deacon@arm.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH v15 04/13] task_isolation: add initial support
Date: Tue, 27 Sep 2016 16:51:29 +0200 [thread overview]
Message-ID: <20160927145128.GF6242@lerouge> (raw)
In-Reply-To: <20160927143926.GQ2794@worktop>
On Tue, Sep 27, 2016 at 04:39:26PM +0200, Peter Zijlstra wrote:
> On Tue, Sep 27, 2016 at 04:22:20PM +0200, Frederic Weisbecker wrote:
>
> > The RCU context tracking doesn't take care of callbacks. It's only there
> > to tell the RCU core whether the CPU runs code that may or may not run
> > RCU read side critical sections. This is assumed by "kernel may use RCU,
> > userspace can't".
>
> Userspace never can use the kernels RCU in any case. What you mean to
> say is that userspace is treated like an idle CPU in that the CPU will
> no longer be part of the RCU quescent state machine.
>
> The transition to userspace (as per context tracking) must ensure that
> CPUs RCU state is 'complete', just like our transition to idle (mostly)
> does.
Exactly!
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next prev parent reply other threads:[~2016-09-27 14:51 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-16 21:19 [PATCH v15 00/13] support "task_isolation" mode Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 04/13] task_isolation: add initial support Chris Metcalf
2016-08-29 16:33 ` Peter Zijlstra
2016-08-29 16:40 ` Chris Metcalf
2016-08-29 16:48 ` Peter Zijlstra
2016-08-29 16:53 ` Chris Metcalf
2016-08-30 7:59 ` Peter Zijlstra
2016-08-30 7:58 ` Peter Zijlstra
[not found] ` <20160830075854.GZ10153-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-08-30 15:32 ` Chris Metcalf
2016-08-30 16:30 ` Andy Lutomirski
2016-08-30 17:02 ` Chris Metcalf
2016-08-30 18:43 ` Andy Lutomirski
2016-08-30 19:37 ` Chris Metcalf
2016-08-30 19:50 ` Andy Lutomirski
2016-09-02 14:04 ` Chris Metcalf
[not found] ` <3f84f736-ed7f-adff-d5f0-4f7db664208f-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-09-02 17:28 ` Andy Lutomirski
2016-09-09 17:40 ` Chris Metcalf
2016-09-12 17:41 ` Andy Lutomirski
2016-09-12 19:25 ` Chris Metcalf
2016-09-27 14:22 ` Frederic Weisbecker
2016-09-27 14:39 ` Peter Zijlstra
2016-09-27 14:51 ` Frederic Weisbecker [this message]
2016-09-27 14:48 ` Paul E. McKenney
2016-09-30 16:59 ` Chris Metcalf
2016-09-01 10:06 ` Peter Zijlstra
2016-09-02 14:03 ` Chris Metcalf
2016-09-02 16:40 ` Peter Zijlstra
2016-08-16 21:19 ` [PATCH v15 12/13] task_isolation: add user-settable notification signal Chris Metcalf
[not found] ` <1471382376-5443-1-git-send-email-cmetcalf-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-08-17 19:37 ` [PATCH] Fix /proc/stat freezes (was [PATCH v15] "task_isolation" mode) Christoph Lameter
2016-08-20 1:42 ` Chris Metcalf
2016-09-28 13:16 ` Frederic Weisbecker
2016-08-29 16:27 ` Ping: [PATCH v15 00/13] support "task_isolation" mode Chris Metcalf
2016-09-07 21:11 ` Francis Giraldeau
[not found] ` <057a958c-4491-b449-ae59-7d331afc872d-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-09-07 21:39 ` Francis Giraldeau
2016-09-08 16:21 ` Francis Giraldeau
2016-09-12 16:01 ` Chris Metcalf
2016-09-12 16:14 ` Peter Zijlstra
2016-09-12 21:15 ` Rafael J. Wysocki
2016-09-13 0:05 ` Rafael J. Wysocki
2016-09-13 16:00 ` Francis Giraldeau
2016-09-13 0:20 ` Francis Giraldeau
[not found] ` <3e93004f-e1c5-f606-33fb-7cb44b99eb0a-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-09-13 16:12 ` Chris Metcalf
2016-09-27 14:49 ` Frederic Weisbecker
2016-09-27 14:35 ` Frederic Weisbecker
2016-09-30 17:07 ` Chris Metcalf
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