From: Peter Zijlstra <peterz@infradead.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, rostedt@goodmis.org,
dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com,
fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH v2 tip/core/rcu 01/22] smpboot: Add common code for notification from dying CPU
Date: Tue, 17 Mar 2015 09:18:07 +0100 [thread overview]
Message-ID: <20150317081807.GQ2896@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <1426531086-23825-1-git-send-email-paulmck@linux.vnet.ibm.com>
On Mon, Mar 16, 2015 at 11:37:45AM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
>
> RCU ignores offlined CPUs, so they cannot safely run RCU read-side code.
> (They -can- use SRCU, but not RCU.) This means that any use of RCU
> during or after the call to arch_cpu_idle_dead(). Unfortunately,
> commit 2ed53c0d6cc99 added a complete() call, which will contain RCU
> read-side critical sections if there is a task waiting to be awakened.
Got a little more detail there?
next prev parent reply other threads:[~2015-03-17 8:18 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-16 18:37 [PATCH v2 tip/core/rcu 0/22] CPU hotplug updates for v4.1 Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 01/22] smpboot: Add common code for notification from dying CPU Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 02/22] x86: Use common outgoing-CPU-notification code Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 03/22] blackfin: " Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 04/22] metag: " Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 05/22] rcu: Consolidate offline-CPU callback initialization Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 06/22] rcu: Put all orphan-callback-related code under same comment Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 07/22] rcu: Simplify sync_rcu_preempt_exp_init() Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 08/22] rcu: Eliminate empty HOTPLUG_CPU ifdef Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 09/22] rcu: Detect stalls caused by failure to propagate up rcu_node tree Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 10/22] rcu: Provide diagnostic option to slow down grace-period initialization Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 11/22] rcutorture: Enable slow grace-period initializations Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 12/22] rcu: Remove event tracing from rcu_cpu_notify(), used by offline CPUs Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 13/22] rcu: Rework preemptible expedited bitmask handling Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 14/22] rcu: Move rcu_report_unblock_qs_rnp() to common code Paul E. McKenney
2015-03-16 18:37 ` [PATCH v2 tip/core/rcu 15/22] rcu: Process offlining and onlining only at grace-period start Paul E. McKenney
2015-03-16 18:38 ` [PATCH v2 tip/core/rcu 16/22] rcu: Eliminate ->onoff_mutex from rcu_node structure Paul E. McKenney
2015-03-16 18:38 ` [PATCH v2 tip/core/rcu 17/22] cpu: Make CPU-offline idle-loop transition point more precise Paul E. McKenney
2015-03-16 18:38 ` [PATCH v2 tip/core/rcu 18/22] rcu: Handle outgoing CPUs on exit from idle loop Paul E. McKenney
2015-03-16 18:38 ` [PATCH v2 tip/core/rcu 19/22] rcutorture: Default to grace-period-initialization delays Paul E. McKenney
2015-03-16 18:38 ` [PATCH v2 tip/core/rcu 20/22] rcu: Add diagnostics to grace-period cleanup Paul E. McKenney
2015-03-16 18:38 ` [PATCH v2 tip/core/rcu 21/22] rcu: Yet another fix for preemption and CPU hotplug Paul E. McKenney
2015-03-16 18:38 ` [PATCH v2 tip/core/rcu 22/22] rcu: Associate quiescent-state reports with grace period Paul E. McKenney
2015-03-17 8:18 ` Peter Zijlstra [this message]
2015-03-17 11:36 ` [PATCH v2 tip/core/rcu 01/22] smpboot: Add common code for notification from dying CPU Paul E. McKenney
2015-03-17 14:08 ` Peter Zijlstra
2015-03-17 16:34 ` Paul E. McKenney
2015-03-17 16:56 ` Peter Zijlstra
2015-03-17 17:32 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150317081807.GQ2896@worktop.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=bobby.prani@gmail.com \
--cc=dhowells@redhat.com \
--cc=dipankar@in.ibm.com \
--cc=dvhart@linux.intel.com \
--cc=edumazet@google.com \
--cc=fweisbec@gmail.com \
--cc=josh@joshtriplett.org \
--cc=laijs@cn.fujitsu.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mingo@kernel.org \
--cc=oleg@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox