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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-12-02 12:10:15 -0800
committerIngo Molnar <mingo@elte.hu>2009-12-03 11:35:25 +0100
commitd9a3da0699b24a589b27a61e1a5b5bd30d9db669 (patch)
treef7440e396a6c818f3cef514ccc31ab55d88025ef /kernel/rcutree_trace.c
parentcf244dc01bf68e1ad338b82447f8686d24ea4435 (diff)
downloadop-kernel-dev-d9a3da0699b24a589b27a61e1a5b5bd30d9db669.zip
op-kernel-dev-d9a3da0699b24a589b27a61e1a5b5bd30d9db669.tar.gz
rcu: Add expedited grace-period support for preemptible RCU
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>
Diffstat (limited to 'kernel/rcutree_trace.c')
-rw-r--r--kernel/rcutree_trace.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 1984cdc..9d2c884 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -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");
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