From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Josh Triplett <josh@joshtriplett.org>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
tglx@linutronix.de, peterz@infradead.org, 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 tip/core/rcu 0/13] Miscellaneous fixes for 4.4
Date: Tue, 6 Oct 2015 10:38:07 -0700 [thread overview]
Message-ID: <20151006173807.GK3910@linux.vnet.ibm.com> (raw)
In-Reply-To: <20151006172351.GF9600@cloud>
On Tue, Oct 06, 2015 at 10:23:51AM -0700, Josh Triplett wrote:
> On Tue, Oct 06, 2015 at 09:13:05AM -0700, Paul E. McKenney wrote:
> > Hello!
> >
> > This series contains miscellaneous fixes:
> >
> > 1. Export sched_setscheduler_nocheck() so that the new locktorture
> > rtmutex_lock tests can be run as modules, courtesy of Davidlohr
> > Bueso.
> >
> > 2. Use rcu_callback_t in call_rcu*() and friends to improve
> > readability and to make cscope able to find them, courtesy of
> > Boqun Feng.
> >
> > 3. Use call_rcu_func_t to replace explicit type equivalents when
> > defining RCU callback functions, courtesy of Boqun Feng.
> >
> > 4. Don't unnecessarily disable preemption for Tiny and Tree
> > RCU readers (only for preemptible RCU readers), courtesy
> > of Boqun Feng.
> >
> > 5. Eliminate boot-time panic when a silly boot-time fanout is
> > specified.
> >
> > 6. Add online/offline info to help debug stall-warning messages.
> >
> > 7. Move preemption disabling out of __srcu_read_lock() into
> > srcu_read_lock().
> >
> > 8. Finish folding ->fqs_state into ->gp_state, courtesy of Petr Mladek.
> >
> > 9. Correct comment for values of ->gp_state field.
> >
> > 10. Add rcu_pointer_handoff() to allow explicit marking of handing
> > off protection from RCU to some other means, such as locking
> > or reference counting.
> >
> > 11. Make list_entry_rcu() use lockless_dereference(), courtesy
> > of Patrick Marlier. Despite the fact that this patch
> > does nothing more than eliminate a single store and a
> > single load of an unshared stack variable it nevertheless
> > manages to provide a measurable performance increase:
> > http://people.csail.mit.edu/amatveev/RLU_SOSP2015.pdf
> >
> > 12. Remove deprecated rcu_lockdep_assert().
>
> (And a patch 13 not mentioned here.)
Oops... "Use WRITE_ONCE() when deleting from reader-visible list" included
to make KTSAN happier.
> I responded to patches 4, 6, and 10 with feedback; for the rest (and for
> those with the issues addressed):
>
> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Thank you for the review and comments!
Thanx, Paul
prev parent reply other threads:[~2015-10-06 17:38 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-06 16:13 [PATCH tip/core/rcu 0/13] Miscellaneous fixes for 4.4 Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 01/13] sched: Export sched_setscheduler_nocheck Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 02/13] rcu: Use rcu_callback_t in call_rcu*() and friends Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 03/13] rcu: Use call_rcu_func_t to replace explicit type equivalents Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 04/13] rcu: Don't disable preemption for Tiny and Tree RCU readers Paul E. McKenney
2015-10-06 16:20 ` [Kernel networking modules.] OSI levels 2 & 3, Assistance - If anyone knows anyone in the US. North West region John D Allen, Leveridge Systems INC
2015-10-06 16:44 ` [PATCH tip/core/rcu 04/13] rcu: Don't disable preemption for Tiny and Tree RCU readers Josh Triplett
2015-10-06 17:01 ` Paul E. McKenney
2015-10-06 17:16 ` Josh Triplett
2015-10-06 17:42 ` Paul E. McKenney
2015-10-06 17:46 ` Josh Triplett
2015-10-06 20:05 ` Peter Zijlstra
2015-10-06 20:18 ` Paul E. McKenney
2015-10-06 20:52 ` Peter Zijlstra
2015-10-06 21:05 ` Paul E. McKenney
2015-10-07 7:19 ` Peter Zijlstra
2015-10-06 16:13 ` [PATCH tip/core/rcu 05/13] rcu: Eliminate panic when silly boot-time fanout specified Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 06/13] rcu: Add online/offline info to stall warning message Paul E. McKenney
2015-10-06 17:15 ` Josh Triplett
2015-10-06 16:13 ` [PATCH tip/core/rcu 07/13] rcu: Move preemption disabling out of __srcu_read_lock() Paul E. McKenney
2015-10-06 17:18 ` Josh Triplett
2015-10-06 17:36 ` Paul E. McKenney
2015-10-06 17:43 ` Josh Triplett
2015-10-06 18:07 ` Paul E. McKenney
2015-10-06 20:07 ` Peter Zijlstra
2015-10-06 20:19 ` Paul E. McKenney
2015-10-06 20:32 ` Peter Zijlstra
2015-10-06 21:03 ` Paul E. McKenney
2015-10-07 7:20 ` Peter Zijlstra
2015-10-07 14:18 ` Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 08/13] rcu: Finish folding ->fqs_state into ->gp_state Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 09/13] rcu: Correct comment for values of ->gp_state field Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 10/13] rcu: Add rcu_pointer_handoff() Paul E. McKenney
2015-10-06 17:21 ` Josh Triplett
2015-10-06 17:31 ` Paul E. McKenney
2015-10-06 17:36 ` Josh Triplett
2015-10-06 20:27 ` Peter Zijlstra
2015-10-06 21:02 ` Paul E. McKenney
2015-10-07 7:22 ` Peter Zijlstra
2015-10-07 14:20 ` Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 11/13] rculist: Make list_entry_rcu() use lockless_dereference() Paul E. McKenney
2015-10-26 8:45 ` Ingo Molnar
2015-10-26 14:55 ` Paul E. McKenney
2015-10-26 18:02 ` Ingo Molnar
2015-10-27 3:37 ` Linus Torvalds
2015-10-27 5:19 ` Tejun Heo
2015-10-27 5:33 ` Paul E. McKenney
2015-10-28 8:33 ` Ingo Molnar
2015-10-28 20:35 ` Patrick Marlier
2015-10-29 0:00 ` Paul E. McKenney
2015-10-29 2:13 ` Tejun Heo
2015-10-28 20:58 ` [tip:core/rcu] fs/writeback, rcu: Don't use list_entry_rcu() for pointer offsetting in bdi_split_work_to_wbs() tip-bot for Tejun Heo
2015-10-27 5:32 ` [PATCH tip/core/rcu 11/13] rculist: Make list_entry_rcu() use lockless_dereference() Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 12/13] rcu: Remove deprecated rcu_lockdep_assert() Paul E. McKenney
2015-10-06 16:13 ` [PATCH tip/core/rcu 13/13] rculist: Use WRITE_ONCE() when deleting from reader-visible list Paul E. McKenney
2015-10-06 17:23 ` [PATCH tip/core/rcu 0/13] Miscellaneous fixes for 4.4 Josh Triplett
2015-10-06 17:38 ` Paul E. McKenney [this message]
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