Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1624982
| From | Josh Triplett <josh@joshtriplett.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 tip/core/rcu 03/39] srcu: Consolidate batch checking into rcu_all_batches_empty() |
| Date | 2017-04-18 02:40 +0200 |
| Message-ID | <txplw-7EF-15@gated-at.bofh.it> (permalink) |
| References | <txoz7-789-5@gated-at.bofh.it> <txoIN-7c0-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Apr 17, 2017 at 04:44:50PM -0700, Paul E. McKenney wrote:
> The srcu_reschedule() function invokes rcu_batch_empty() on each of
> the four rcu_batch structures in the srcu_struct in question twice.
> Given that this check will also be needed in cleanup_srcu_struct(), this
> commit consolidates these four checks into a new rcu_all_batches_empty()
> function.
>
> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
> kernel/rcu/srcu.c | 21 +++++++++++++--------
> 1 file changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c
> index ef3bcfb15b39..ba41a5d04b49 100644
> --- a/kernel/rcu/srcu.c
> +++ b/kernel/rcu/srcu.c
> @@ -65,6 +65,17 @@ static inline bool rcu_batch_empty(struct rcu_batch *b)
> }
>
> /*
> + * Are all batches empty for the specified srcu_struct?
> + */
> +static inline bool rcu_all_batches_empty(struct srcu_struct *sp)
> +{
> + return rcu_batch_empty(&sp->batch_done) &&
> + rcu_batch_empty(&sp->batch_check1) &&
> + rcu_batch_empty(&sp->batch_check0) &&
> + rcu_batch_empty(&sp->batch_queue);
> +}
> +
> +/*
> * Remove the callback at the head of the specified rcu_batch structure
> * and return a pointer to it, or return NULL if the structure is empty.
> */
> @@ -619,15 +630,9 @@ static void srcu_reschedule(struct srcu_struct *sp)
> {
> bool pending = true;
>
> - if (rcu_batch_empty(&sp->batch_done) &&
> - rcu_batch_empty(&sp->batch_check1) &&
> - rcu_batch_empty(&sp->batch_check0) &&
> - rcu_batch_empty(&sp->batch_queue)) {
> + if (rcu_all_batches_empty(sp)) {
> spin_lock_irq(&sp->queue_lock);
> - if (rcu_batch_empty(&sp->batch_done) &&
> - rcu_batch_empty(&sp->batch_check1) &&
> - rcu_batch_empty(&sp->batch_check0) &&
> - rcu_batch_empty(&sp->batch_queue)) {
> + if (rcu_all_batches_empty(sp)) {
> sp->running = false;
> pending = false;
> }
> --
> 2.5.2
>
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH tip/core/rcu 0/40] SRCU callback parallelization for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:50 +0200
[PATCH tip/core/rcu 03/40] srcu: Consolidate batch checking into rcu_all_batches_empty() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 20:00 +0200
[PATCH tip/core/rcu 05/40] rcu: Semicolon inside RCU_TRACE() for rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 20:00 +0200
[PATCH tip/core/rcu 11/40] rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 20:00 +0200
Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling Peter Zijlstra <peterz@infradead.org> - 2017-04-13 12:00 +0200
Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 18:40 +0200
Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:50 +0200
Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling Peter Zijlstra <peterz@infradead.org> - 2017-04-13 12:00 +0200
Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:00 +0200
[PATCH v2 tip/core/rcu 0/40] SRCU callback parallelization for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 02/39] rcu: Make arch select smp_mb__after_unlock_lock() strength "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
Re: [PATCH v2 tip/core/rcu 02/39] rcu: Make arch select smp_mb__after_unlock_lock() strength Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:20 +0200
[PATCH v2 tip/core/rcu 10/39] rcu: Eliminate flavor scan in rcu_momentary_dyntick_idle() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 24/39] srcu: Move combining-tree definitions for SRCU's benefit "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 31/39] srcu: Allow a second bit in rcu_seq for SRCU state "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 15/39] srcu: Allow early boot use of synchronize_srcu() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 14/39] srcu: Allow SRCU to access rcu_scheduler_active "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 05/39] rcu: Semicolon inside RCU_TRACE() for rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 33/39] srcu: Crude control of expedited grace periods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 29/39] srcu: Fix bogus try_check_zero() comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 25/39] srcu: Move rcu_init_levelspread() to rcu_tree_node.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 27/39] srcu: Move rcu_node traversal macros to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 06/39] rcu: Semicolon inside RCU_TRACE() for Tiny RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 39/39] rcu: Make non-preemptive schedule be Tasks RCU quiescent state "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 07/39] rcu: Semicolon inside RCU_TRACE() for tree.c "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 18/39] rcu: Expedited wakeups need to be fully ordered "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 21/39] srcu: Move to state-based grace-period sequencing "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 22/39] srcu: Add grace-period sequence numbers "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 34/39] mm: Use static initialization for "srcu" "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 35/39] srcu: Create a tiny SRCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 16/39] rcu: Add single-element dequeue functions to rcu_segcblist "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:50 +0200
[PATCH v2 tip/core/rcu 19/39] rcu: Fix warning in rcu_seq_end() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 03/39] srcu: Consolidate batch checking into rcu_all_batches_empty() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
Re: [PATCH v2 tip/core/rcu 03/39] srcu: Consolidate batch checking into rcu_all_batches_empty() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:40 +0200
[PATCH v2 tip/core/rcu 08/39] rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 09/39] rcu: Pull rcu_qs_ctr into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 30/39] srcu: Improve rcu_seq grace-period-counter abstraction "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 17/39] srcu: Move rcu_seq_start() and friends to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 11/39] rcu: Place guard on rcu_all_qs() and rcu_note_context_switch() actions "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 28/39] srcu: Make num_rcu_lvl[] array be external "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 26/39] rcu: Remove redundant levelcnt[] array from rcu_init_one() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 32/39] srcu: Merge ->srcu_state into ->srcu_gp_seq "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 36/39] srcutorture: Print Tiny SRCU reader statistics "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
[PATCH v2 tip/core/rcu 01/39] rcu: Maintain special bits at bottom of ->dynticks counter "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
Re: [PATCH v2 tip/core/rcu 01/39] rcu: Maintain special bits at bottom of ->dynticks counter Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:10 +0200
Re: [PATCH v2 tip/core/rcu 01/39] rcu: Maintain special bits at bottom of ->dynticks counter "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 20:30 +0200
[PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 02:00 +0200
Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:40 +0200
Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 20:40 +0200
Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 21:50 +0200
Re: [PATCH v2 tip/core/rcu 04/39] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:40 +0200
[PATCH v3 tip/core/rcu 0/40] SRCU callback parallelization for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200
[PATCH v3 tip/core/rcu 35/40] srcu: Create a tiny SRCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200
[PATCH v3 tip/core/rcu 12/40] rcu: Default RCU_FANOUT_LEAF to 16 unless explicitly changed "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200
[PATCH v3 tip/core/rcu 05/40] rcu: Semicolon inside RCU_TRACE() for rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
Re: [PATCH v3 tip/core/rcu 05/40] rcu: Semicolon inside RCU_TRACE() for rcu.h Joe Perches <joe@perches.com> - 2017-04-19 19:50 +0200
[PATCH v3 tip/core/rcu 26/40] rcu: Remove redundant levelcnt[] array from rcu_init_one() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 14/40] srcu: Allow SRCU to access rcu_scheduler_active "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 27/40] srcu: Move rcu_node traversal macros to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 19/40] rcu: Fix warning in rcu_seq_end() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 29/40] srcu: Fix bogus try_check_zero() comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 28/40] srcu: Make num_rcu_lvl[] array be external "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 22/40] srcu: Add grace-period sequence numbers "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 39/40] srcu: Expedite srcu_schedule_cbs_snp() callback invocation "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 30/40] srcu: Improve rcu_seq grace-period-counter abstraction "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 01/40] rcu: Maintain special bits at bottom of ->dynticks counter "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 20/40] srcu: Push srcu_advance_batches() fastpath into common case "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 34/40] mm: Use static initialization for "srcu" "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 17/40] srcu: Move rcu_seq_start() and friends to rcu.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 08/40] rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 36/40] srcutorture: Print Tiny SRCU reader statistics "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 09/40] rcu: Pull rcu_qs_ctr into rcu_dynticks structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 04/40] srcu: Check for tardy grace-period activity in cleanup_srcu_struct() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 07/40] rcu: Semicolon inside RCU_TRACE() for tree.c "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 10/40] rcu: Eliminate flavor scan in rcu_momentary_dyntick_idle() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 02/40] rcu: Make arch select smp_mb__after_unlock_lock() strength "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 24/40] srcu: Move combining-tree definitions for SRCU's benefit "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 15/40] srcu: Allow early boot use of synchronize_srcu() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 33/40] srcu: Crude control of expedited grace periods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 06/40] rcu: Semicolon inside RCU_TRACE() for Tiny RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 03/40] srcu: Consolidate batch checking into rcu_all_batches_empty() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 32/40] srcu: Merge ->srcu_state into ->srcu_gp_seq "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
[PATCH v3 tip/core/rcu 25/40] srcu: Move rcu_init_levelspread() to rcu_tree_node.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:10 +0200
powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-20 05:50 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-20 16:30 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Paolo Bonzini <pbonzini@redhat.com> - 2017-04-20 17:30 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-21 02:40 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-21 03:50 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-21 06:20 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Paolo Bonzini <pbonzini@redhat.com> - 2017-04-21 09:30 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-21 15:00 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-22 08:20 +0200
Re: powerpc KVM build break in linux-next (was Re: [PATCH tip/core/rcu 40/40] srcu: Parallelize callback handling) Michael Ellerman <michaele@au1.ibm.com> - 2017-04-21 04:20 +0200
csiph-web