From: Peter Zijlstra <peterz@infradead.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: josh@joshtriplett.org, linux-kernel@vger.kernel.org,
mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
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
Subject: Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones
Date: Wed, 1 Jul 2015 16:17:10 +0200 [thread overview]
Message-ID: <20150701141710.GG25159@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20150701140031.GB3717@linux.vnet.ibm.com>
On Wed, Jul 01, 2015 at 07:00:31AM -0700, Paul E. McKenney wrote:
> That is a bit extreme, Peter.
Of course; but I'm really not seeing people taking due care with them
> Are a huge pile of them coming in this merge window or something?
> What raised your concerns on this issue?
This is complete horse manure (breaking the nvidiot binary blob is a
good thing):
74b51ee152b6 ("ACPI / osl: speedup grace period in acpi_os_map_cleanup")
Also, I'm not entirely convinced things like:
fd2ed4d25270 ("dm: add statistics support")
83d5e5b0af90 ("dm: optimize use SRCU and RCU")
ef3230880abd ("backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu")
Are in the 'never' happens category. Esp. the backing-dev one, it
triggers every time you unplug a USB stick or similar.
Rejigging a DM might indeed be rare enough; but then again, people use
DM explicitly so they can rejig while in operation.
Also, they really do not explain how expedited really is the only option
available. Why things can't be batched etc..
next prev parent reply other threads:[~2015-07-01 14:17 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-30 21:48 Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 1/5] rcu: Prepare for expedited GP driving normal GP Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 2/5] rcu: Short-circuit normal GPs via expedited GPs Paul E. McKenney
2015-07-01 10:03 ` Peter Zijlstra
2015-07-01 13:42 ` Paul E. McKenney
2015-07-01 20:59 ` Paul E. McKenney
2015-07-01 10:05 ` Peter Zijlstra
2015-07-01 13:41 ` Paul E. McKenney
2015-07-01 13:48 ` Peter Zijlstra
2015-07-01 14:03 ` Paul E. McKenney
2015-07-02 12:03 ` Peter Zijlstra
2015-07-02 14:06 ` Paul E. McKenney
2015-07-02 16:48 ` Peter Zijlstra
2015-07-02 19:35 ` Paul E. McKenney
2015-07-06 14:52 ` Peter Zijlstra
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 3/5] rcutorture: Ensure that normal GPs advance without " Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 4/5] rcu: Wake grace-period kthread at end of expedited grace period Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 5/5] rcu: Limit expedited helping to every 10 ms or every 4th GP Paul E. McKenney
2015-06-30 21:56 ` Eric Dumazet
2015-06-30 22:10 ` Paul E. McKenney
2015-07-01 10:07 ` Peter Zijlstra
2015-07-01 13:45 ` Paul E. McKenney
2015-07-01 19:30 ` Paul E. McKenney
2015-06-30 22:00 ` [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones josh
2015-06-30 22:12 ` Paul E. McKenney
2015-06-30 23:46 ` josh
2015-07-01 0:15 ` Paul E. McKenney
2015-07-01 0:42 ` Josh Triplett
2015-07-01 3:37 ` Paul E. McKenney
2015-07-01 10:12 ` Peter Zijlstra
2015-07-01 14:01 ` Paul E. McKenney
2015-07-01 14:08 ` Eric Dumazet
2015-07-01 15:58 ` Paul E. McKenney
2015-07-01 15:43 ` Josh Triplett
2015-07-01 15:59 ` Paul E. McKenney
2015-07-01 10:09 ` Peter Zijlstra
2015-07-01 10:55 ` Peter Zijlstra
2015-07-01 14:00 ` Paul E. McKenney
2015-07-01 14:17 ` Peter Zijlstra [this message]
2015-07-01 16:17 ` Paul E. McKenney
2015-07-01 17:02 ` Peter Zijlstra
2015-07-01 20:09 ` Paul E. McKenney
2015-07-01 21:20 ` josh
2015-07-01 21:49 ` Paul E. McKenney
2015-07-02 7:47 ` Ingo Molnar
2015-07-02 13:58 ` Paul E. McKenney
2015-07-02 18:35 ` Ingo Molnar
2015-07-02 18:47 ` Mathieu Desnoyers
2015-07-02 19:23 ` Paul E. McKenney
2015-07-02 21:07 ` Mathieu Desnoyers
2015-07-02 19:22 ` Paul E. McKenney
2015-07-02 1:11 ` Mike Galbraith
2015-07-02 1:34 ` josh
2015-07-02 1:59 ` Mike Galbraith
2015-07-02 2:18 ` Paul E. McKenney
2015-07-02 2:50 ` Mike Galbraith
2015-07-02 3:15 ` Paul E. McKenney
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