From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Eric Dumazet <edumazet@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
jiangshanlai@gmail.com, dipankar@in.ibm.com,
Andrew Morton <akpm@linux-foundation.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Triplett <josh@joshtriplett.org>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
David Howells <dhowells@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
oleg@redhat.com, pranith kumar <bobby.prani@gmail.com>,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU
Date: Fri, 14 Apr 2017 06:39:51 -0700 [thread overview]
Message-ID: <20170414133951.GY3956@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170414084544.wgubp4ikqmohgn67@hirez.programming.kicks-ass.net>
On Fri, Apr 14, 2017 at 10:45:44AM +0200, Peter Zijlstra wrote:
> On Thu, Apr 13, 2017 at 02:30:19PM -0700, Eric Dumazet wrote:
> > On Thu, Apr 13, 2017 at 9:17 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> >
> > > git log -S SLAB_DESTROY_BY_RCU
> >
> > Maybe, but "git log -S" is damn slow at least here.
> >
> > While "git grep" is _very_ fast
>
> All true. But in general we don't leave endless markers around like
> this.
>
> For instance:
>
> /* the function formerly known as smp_mb__before_clear_bit() */
>
> is not part of the kernel tree. People that used that thing out of tree
> get to deal with it in whatever way they see fit.
Sometimes we don't provide markers and sometimes we do:
$ git grep synchronize_kernel
Documentation/RCU/RTFP.txt:,Title="API change: synchronize_kernel() deprecated"
Documentation/RCU/RTFP.txt: Jon Corbet describes deprecation of synchronize_kernel()
kernel/rcu/tree.c: * synchronize_kernel() API. In contrast, synchronize_rcu() only
Given that it has been more than a decade, I could easily see my way to
removing this synchronize_kernel() tombstone in kernel/rcu/tree.c if
people are annoyed by it. But thus far, no one has complained.
So how long should we wait to remove the SLAB_DESTROY_BY_RCU tombstone?
I can easily add an event to my calendar to remind me to remove it.
Thanx, Paul
next prev parent reply other threads:[~2017-04-14 13:40 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-12 16:54 [PATCH tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU Paul E. McKenney
2017-04-13 9:12 ` Peter Zijlstra
2017-04-13 11:06 ` Vlastimil Babka
2017-04-13 16:00 ` Paul E. McKenney
2017-04-13 16:17 ` Peter Zijlstra
2017-04-13 17:24 ` Paul E. McKenney
2017-04-13 21:30 ` Eric Dumazet
2017-04-14 8:45 ` Peter Zijlstra
2017-04-14 13:39 ` Paul E. McKenney [this message]
2017-04-12 16:55 ` [PATCH tip/core/rcu 02/13] lockdep: Use "WARNING" tag on lockdep splats Paul E. McKenney
2017-04-13 9:14 ` Peter Zijlstra
2017-04-13 16:01 ` Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 03/13] types: Update obsolete callback_head comment Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick Paul E. McKenney
2017-04-13 9:15 ` Peter Zijlstra
2017-04-13 16:03 ` Paul E. McKenney
2017-04-13 16:19 ` Peter Zijlstra
2017-04-13 16:55 ` Paul E. McKenney
2017-04-13 17:04 ` Peter Zijlstra
2017-04-13 17:31 ` Paul E. McKenney
2017-04-13 17:46 ` Peter Zijlstra
2017-04-13 18:19 ` Paul E. McKenney
2017-04-13 18:23 ` Peter Zijlstra
2017-04-13 18:42 ` Paul E. McKenney
2017-04-19 13:22 ` Peter Zijlstra
2017-04-19 13:48 ` Peter Zijlstra
2017-04-19 15:08 ` Paul E. McKenney
2017-04-19 15:40 ` Peter Zijlstra
2017-04-19 16:13 ` Paul E. McKenney
2017-04-19 14:50 ` Paul E. McKenney
2017-04-13 18:29 ` Peter Zijlstra
2017-04-13 19:42 ` Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 05/13] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 06/13] hlist_add_tail_rcu disable sparse warning Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Paul E. McKenney
2017-04-13 9:18 ` Peter Zijlstra
2017-04-13 9:33 ` Peter Zijlstra
2017-04-13 16:10 ` Paul E. McKenney
2017-04-13 16:24 ` Peter Zijlstra
2017-04-13 16:57 ` Paul E. McKenney
2017-04-13 17:10 ` Peter Zijlstra
2017-04-13 17:39 ` Paul E. McKenney
2017-04-13 17:51 ` Peter Zijlstra
2017-04-13 17:59 ` Peter Zijlstra
2017-04-19 23:24 ` Paul E. McKenney
2017-04-19 23:23 ` Paul E. McKenney
2017-04-20 11:17 ` Peter Zijlstra
2017-04-20 15:03 ` Paul E. McKenney
2017-04-20 15:08 ` Peter Zijlstra
2017-06-09 22:56 ` Paul E. McKenney
2017-06-12 14:51 ` Dmitry Vyukov
2017-06-12 21:54 ` Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 08/13] rcu: Improve comments for hotplug/suspend/hibernate functions Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 09/13] mm: Use static initialization for "srcu" Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 10/13] torture: Use correct path for Kconfig fragment for duplicates Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 11/13] rcu: Use bool value directly Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 12/13] rcu: Use true/false in assignment to bool Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 13/13] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment Paul E. McKenney
2017-04-17 23:27 ` [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 01/11] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU Paul E. McKenney
2017-04-18 0:14 ` David Rientjes
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 02/11] lockdep: Use "WARNING" tag on lockdep splats Paul E. McKenney
2017-04-19 15:00 ` Josh Triplett
2017-04-19 16:26 ` Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 03/11] types: Update obsolete callback_head comment Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick Paul E. McKenney
2017-04-18 0:18 ` Josh Triplett
2017-04-18 18:42 ` Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 05/11] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 06/11] hlist_add_tail_rcu disable sparse warning Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 07/11] rcu: Improve comments for hotplug/suspend/hibernate functions Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 08/11] torture: Use correct path for Kconfig fragment for duplicates Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 09/11] rcu: Use bool value directly Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 10/11] rcu: Use true/false in assignment to bool Paul E. McKenney
2017-04-17 23:28 ` [PATCH v2 tip/core/rcu 11/11] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment Paul E. McKenney
2017-04-19 11:28 ` [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra
2017-04-19 11:35 ` Peter Zijlstra
2017-04-19 11:48 ` Christian Borntraeger
2017-04-19 12:08 ` Peter Zijlstra
2017-04-19 12:51 ` Marc Zyngier
2017-04-19 14:47 ` Paul E. McKenney
2017-04-19 14:52 ` Peter Zijlstra
2017-04-19 15:13 ` Paul E. McKenney
2017-04-19 14:58 ` Josh Triplett
2017-04-19 15:03 ` Peter Zijlstra
2017-04-19 15:17 ` Paul E. McKenney
2017-04-19 13:22 ` Paul E. McKenney
2017-04-19 13:25 ` Christian Borntraeger
2017-04-19 13:02 ` Paul E. McKenney
2017-04-19 13:15 ` Peter Zijlstra
2017-04-19 15:37 ` Paul E. McKenney
2017-04-19 15:43 ` Peter Zijlstra
2017-04-19 16:12 ` Paul E. McKenney
2017-04-19 16:45 ` Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 01/11] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 02/11] lockdep: Use "WARNING" tag on lockdep splats Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 03/11] types: Update obsolete callback_head comment Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 05/11] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 06/11] hlist_add_tail_rcu disable sparse warning Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 07/11] rcu: Improve comments for hotplug/suspend/hibernate functions Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 08/11] torture: Use correct path for Kconfig fragment for duplicates Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 09/11] rcu: Use bool value directly Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 10/11] rcu: Use true/false in assignment to bool Paul E. McKenney
2017-04-19 16:46 ` [PATCH v3 tip/core/rcu 11/11] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment Paul E. McKenney
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