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Subject[PATCH 17/24] jrcu: track #passes since last end-of-batch
jrcu: track how many passes have gone by since last end-of-batch.

Signed-off-by: Joe Korty <joe.korty@ccur.com>

Index: b/kernel/jrcu.c
===================================================================
--- a/kernel/jrcu.c
+++ b/kernel/jrcu.c
@@ -120,6 +120,7 @@ static struct rcu_data rcu_data[NR_CPUS]
/* debug & statistics stuff */
static struct rcu_stats {
unsigned npasses; /* #passes made */
+ unsigned nlast; /* #passes since last end-of-batch */
unsigned nbatches; /* #end-of-batches (eobs) seen */
atomic_t nbarriers; /* #rcu barriers processed */
atomic_t nsyncs; /* #rcu syncs processed */
@@ -329,6 +330,8 @@ static void __rcu_delimit_batches(struct
* gone by.
*/
rcu_now = sched_clock();
+ rcu_stats.nlast++;
+
if (!eob && !rcu_timestamp
&& ((rcu_now - rcu_timestamp) > (s64)rcu_wdog * NSEC_PER_SEC)) {
rcu_stats.nforced++;
@@ -389,6 +392,7 @@ static void __rcu_delimit_batches(struct
*/
xchg(&rcu_which, prev); /* only place where rcu_which is written to */
rcu_stats.nbatches++;
+ rcu_stats.nlast = 0;
}

static void rcu_delimit_batches(void)
@@ -598,6 +602,8 @@ static int rcu_debugfs_show(struct seq_f
rcu_stats.nbatches);
seq_printf(m, "%14u: #passes not resulting in end-of-batch\n",
rcu_stats.npasses - rcu_stats.nbatches);
+ seq_printf(m, "%14u: #passes since last end-of-batch\n",
+ rcu_stats.nlast);
seq_printf(m, "%14u: #msecs since last end-of-batch\n",
msecs);
seq_printf(m, "%14u: #passes forced (0 is best)\n",

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