From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
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 16:39:26 +0200 [thread overview]
Message-ID: <20160927143926.GQ2794@worktop> (raw)
In-Reply-To: <20160927142219.GC6242@lerouge>
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.
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next prev parent reply other threads:[~2016-09-27 14:39 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 [this message]
2016-09-27 14:51 ` Frederic Weisbecker
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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