* [PATCH 23/24] jrcu: better timer slop
@ 2011-03-24 17:48 Joe Korty
0 siblings, 0 replies; only message in thread
From: Joe Korty @ 2011-03-24 17:48 UTC (permalink / raw)
To: paulmck
Cc: fweisbec, peterz, laijs, mathieu.desnoyers, dhowells,
loic.minier, dhaval.giani, tglx, josh, houston.jim, andi,
linux-kernel
jrcu: fix broken timer slop
The expression
USEC_PER_SEC / (HZ * 3 / 2)
was trying to define a period, in usec, some 50% larger
than the natural HZ period. Instead it made a period
some 30% shorter.
But such attempts are completely unnecessary. HZ alone
works just fine.
Signed-off-by: Joe Korty <joe.korty@ccur.com>
Index: b/kernel/jrcu.c
===================================================================
--- a/kernel/jrcu.c
+++ b/kernel/jrcu.c
@@ -131,7 +131,7 @@ static struct rcu_stats {
#define RCU_HZ (20)
#define RCU_HZ_PERIOD_US (USEC_PER_SEC / RCU_HZ)
-#define RCU_HZ_DELTA_US (USEC_PER_SEC / (HZ * 3 / 2))
+#define RCU_HZ_DELTA_US (USEC_PER_SEC / HZ)
static int rcu_hz = RCU_HZ;
static int rcu_hz_period_us = RCU_HZ_PERIOD_US;
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