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rcu: Add expedited grace-period support for preemptible RCU

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Implement an synchronize_rcu_expedited() for preemptible RCU
that actually is expedited.  This uses
synchronize_sched_expedited() to force all threads currently
running in a preemptible-RCU read-side critical section onto the
appropriate ->blocked_tasks[] list, then takes a snapshot of all
of these lists and waits for them to drain.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
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
Cc: dhowells@redhat.com
LKML-Reference: <1259784616158-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney
2009-12-02 12:10:15 -08:00
committed by Ingo Molnar
parent cf244dc01b
commit d9a3da0699
5 changed files with 260 additions and 27 deletions
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10
kernel/rcutree_trace.c
View File

@@ -157,6 +157,7 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
{
long gpnum;
int level = 0;
int phase;
struct rcu_node *rnp;
gpnum = rsp->gpnum;
@@ -173,10 +174,13 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
seq_puts(m, "\n");
level = rnp->level;
}
seq_printf(m, "%lx/%lx %c>%c %d:%d ^%d ",
phase = gpnum & 0x1;
seq_printf(m, "%lx/%lx %c%c>%c%c %d:%d ^%d ",
rnp->qsmask, rnp->qsmaskinit,
"T."[list_empty(&rnp->blocked_tasks[gpnum & 1])],
"T."[list_empty(&rnp->blocked_tasks[!(gpnum & 1)])],
"T."[list_empty(&rnp->blocked_tasks[phase])],
"E."[list_empty(&rnp->blocked_tasks[phase + 2])],
"T."[list_empty(&rnp->blocked_tasks[!phase])],
"E."[list_empty(&rnp->blocked_tasks[!phase + 2])],
rnp->grplo, rnp->grphi, rnp->grpnum);
}
seq_puts(m, "\n");