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rcu: Apply results of code inspection of kernel/rcutree_plugin.h

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o Drop the calls to cpu_quiet() from the online/offline code.
  These are unnecessary, since force_quiescent_state() will
  clean up, and removing them simplifies the code a bit.

o Add a warning to check that we don't enqueue the same blocked
  task twice onto the ->blocked_tasks[] lists.

o Rework the phase computation in rcu_preempt_note_context_switch()
  to be more readable, as suggested by Josh Triplett.

o Disable irqs to close a race between the scheduling clock
  interrupt and rcu_preempt_note_context_switch() WRT the
  ->rcu_read_unlock_special field.

o Add comments to rnp->lock acquisition and release within
  rcu_read_unlock_special() noting that irqs are already
  disabled.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
LKML-Reference: <12532926201851-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2009-09-18 09:50:18 -07:00 committed by Ingo Molnar
parent 28ecd58020
commit e7d8842ed3
2 changed files with 11 additions and 26 deletions
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27
kernel/rcutree.c
View file

@ -767,10 +767,10 @@ cpu_quiet_msk(unsigned long mask, struct rcu_state *rsp, struct rcu_node *rnp,
/*
* Record a quiescent state for the specified CPU, which must either be
* the current CPU or an offline CPU. The lastcomp argument is used to
* make sure we are still in the grace period of interest. We don't want
* to end the current grace period based on quiescent states detected in
* an earlier grace period!
* the current CPU. The lastcomp argument is used to make sure we are
* still in the grace period of interest. We don't want to end the current
* grace period based on quiescent states detected in an earlier grace
* period!
*/
static void
cpu_quiet(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long lastcomp)
@ -805,7 +805,6 @@ cpu_quiet(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long lastcomp)
* This GP can't end until cpu checks in, so all of our
* callbacks can be processed during the next GP.
*/
rdp = rsp->rda[smp_processor_id()];
rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
cpu_quiet_msk(mask, rsp, rnp, flags); /* releases rnp->lock */
@ -881,9 +880,6 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
spin_unlock(&rsp->onofflock); /* irqs remain disabled. */
/* Being offline is a quiescent state, so go record it. */
cpu_quiet(cpu, rsp, rdp, lastcomp);
/*
* Move callbacks from the outgoing CPU to the running CPU.
* Note that the outgoing CPU is now quiscent, so it is now
@ -1448,20 +1444,7 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptable)
rnp = rnp->parent;
} while (rnp != NULL && !(rnp->qsmaskinit & mask));
spin_unlock(&rsp->onofflock); /* irqs remain disabled. */
/*
* A new grace period might start here. If so, we will be part of
* it, and its gpnum will be greater than ours, so we will
* participate. It is also possible for the gpnum to have been
* incremented before this function was called, and the bitmasks
* to not be filled out until now, in which case we will also
* participate due to our gpnum being behind.
*/
/* Since it is coming online, the CPU is in a quiescent state. */
cpu_quiet(cpu, rsp, rdp, lastcomp);
local_irq_restore(flags);
spin_unlock_irqrestore(&rsp->onofflock, flags);
}
static void __cpuinit rcu_online_cpu(int cpu)

10
kernel/rcutree_plugin.h
View file

@ -117,9 +117,9 @@ static void rcu_preempt_note_context_switch(int cpu)
* on line!
*/
WARN_ON_ONCE((rdp->grpmask & rnp->qsmaskinit) == 0);
phase = !(rnp->qsmask & rdp->grpmask) ^ (rnp->gpnum & 0x1);
WARN_ON_ONCE(!list_empty(&t->rcu_node_entry));
phase = (rnp->gpnum + !(rnp->qsmask & rdp->grpmask)) & 0x1;
list_add(&t->rcu_node_entry, &rnp->blocked_tasks[phase]);
smp_mb(); /* Ensure later ctxt swtch seen after above. */
spin_unlock_irqrestore(&rnp->lock, flags);
}
@ -133,7 +133,9 @@ static void rcu_preempt_note_context_switch(int cpu)
* means that we continue to block the current grace period.
*/
rcu_preempt_qs(cpu);
local_irq_save(flags);
t->rcu_read_unlock_special &= ~RCU_READ_UNLOCK_NEED_QS;
local_irq_restore(flags);
}
/*
@ -189,10 +191,10 @@ static void rcu_read_unlock_special(struct task_struct *t)
*/
for (;;) {
rnp = t->rcu_blocked_node;
spin_lock(&rnp->lock);
spin_lock(&rnp->lock); /* irqs already disabled. */
if (rnp == t->rcu_blocked_node)
break;
spin_unlock(&rnp->lock);
spin_unlock(&rnp->lock); /* irqs remain disabled. */
}
empty = list_empty(&rnp->blocked_tasks[rnp->gpnum & 0x1]);
list_del_init(&t->rcu_node_entry);