diff options
| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-12-30 13:06:35 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-03-26 08:04:56 -0700 |
| commit | 8b425aa8f1acfe48aed919c7aadff2ed290fe969 (patch) | |
| tree | 355c435f747bda4c4051bf2a0e4f88596d7055e2 /kernel | |
| parent | b8462084a2a88a6a0489f9bb7d8b1bb95bc455ab (diff) | |
rcu: Rename n_nocb_gp_requests to need_future_gp
CPUs going idle need to be able to indicate their need for future grace
periods. A mechanism for doing this already exists for no-callbacks
CPUs, so the idea is to re-use that mechanism. This commit therefore
moves the ->n_nocb_gp_requests field of the rcu_node structure out from
under the CONFIG_RCU_NOCB_CPU #ifdef and renames it to ->need_future_gp.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcutree.h | 4 | ||||
| -rw-r--r-- | kernel/rcutree_plugin.h | 18 |
2 files changed, 11 insertions, 11 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h index 96a27f922e92..034b524594bd 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -194,9 +194,9 @@ struct rcu_node { #ifdef CONFIG_RCU_NOCB_CPU wait_queue_head_t nocb_gp_wq[2]; /* Place for rcu_nocb_kthread() to wait GP. */ - int n_nocb_gp_requests[2]; - /* Counts of upcoming no-CB GP requests. */ #endif /* #ifdef CONFIG_RCU_NOCB_CPU */ + int need_future_gp[2]; + /* Counts of upcoming no-CB GP requests. */ raw_spinlock_t fqslock ____cacheline_internodealigned_in_smp; } ____cacheline_internodealigned_in_smp; diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 073ded26e259..f3f0020b5b58 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -2018,7 +2018,7 @@ static int rcu_nocb_needs_gp(struct rcu_state *rsp) { struct rcu_node *rnp = rcu_get_root(rsp); - return rnp->n_nocb_gp_requests[(ACCESS_ONCE(rnp->completed) + 1) & 0x1]; + return rnp->need_future_gp[(ACCESS_ONCE(rnp->completed) + 1) & 0x1]; } /* @@ -2032,8 +2032,8 @@ static int rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp) int needmore; wake_up_all(&rnp->nocb_gp_wq[c & 0x1]); - rnp->n_nocb_gp_requests[c & 0x1] = 0; - needmore = rnp->n_nocb_gp_requests[(c + 1) & 0x1]; + rnp->need_future_gp[c & 0x1] = 0; + needmore = rnp->need_future_gp[(c + 1) & 0x1]; trace_rcu_future_grace_period(rsp->name, rnp->gpnum, rnp->completed, c, rnp->level, rnp->grplo, rnp->grphi, needmore ? "CleanupMore" : "Cleanup"); @@ -2041,7 +2041,7 @@ static int rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp) } /* - * Set the root rcu_node structure's ->n_nocb_gp_requests field + * Set the root rcu_node structure's ->need_future_gp field * based on the sum of those of all rcu_node structures. This does * double-count the root rcu_node structure's requests, but this * is necessary to handle the possibility of a rcu_nocb_kthread() @@ -2050,7 +2050,7 @@ static int rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp) */ static void rcu_nocb_gp_set(struct rcu_node *rnp, int nrq) { - rnp->n_nocb_gp_requests[(rnp->completed + 1) & 0x1] += nrq; + rnp->need_future_gp[(rnp->completed + 1) & 0x1] += nrq; } static void rcu_init_one_nocb(struct rcu_node *rnp) @@ -2181,7 +2181,7 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp) c = rnp->completed + 2; /* Count our request for a grace period. */ - rnp->n_nocb_gp_requests[c & 0x1]++; + rnp->need_future_gp[c & 0x1]++; trace_rcu_future_grace_period(rdp->rsp->name, rnp->gpnum, rnp->completed, c, rnp->level, rnp->grplo, rnp->grphi, "Startleaf"); @@ -2225,10 +2225,10 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp) * Adjust counters accordingly and start the * needed grace period. */ - rnp->n_nocb_gp_requests[c & 0x1]--; + rnp->need_future_gp[c & 0x1]--; c = rnp_root->completed + 1; - rnp->n_nocb_gp_requests[c & 0x1]++; - rnp_root->n_nocb_gp_requests[c & 0x1]++; + rnp->need_future_gp[c & 0x1]++; + rnp_root->need_future_gp[c & 0x1]++; trace_rcu_future_grace_period(rdp->rsp->name, rnp->gpnum, rnp->completed, |