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Message-Id: <1156873612.2993.6.camel@dyn-9-152-230-71.boeblingen.de.ibm.com>
Date: Tue, 29 Aug 2006 19:46:52 +0200
From: Martin Peschke <mp3@...ibm.com>
To: Andrew Morton <akpm@...l.org>
Cc: Jens Axboe <axboe@...nel.dk>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [Patch] blktrace: cleanup using on_each_cpu
This patch kills a few lines of code in blktrace by making use of
on_each_cpu().
Patch against 2.6.18-rc4-mm3.
(Tested with 2.6.17.11, though, as -rc4-mm3 refuses to come up on my
s390 guest.)
Signed-off-by: Martin Peschke <mp3@...ibm.com>
---
blktrace.c | 19 ++++---------------
1 files changed, 4 insertions(+), 15 deletions(-)
diff -urp a/block/blktrace.c b/block/blktrace.c
--- a/block/blktrace.c 2006-08-29 18:10:51.000000000 +0200
+++ b/block/blktrace.c 2006-08-29 19:00:37.000000000 +0200
@@ -476,6 +476,9 @@ static void blk_check_time(unsigned long
*t -= (a + b) / 2;
}
+/*
+ * calibrate our inter-CPU timings
+ */
static void blk_trace_check_cpu_time(void *data)
{
unsigned long long *t;
@@ -493,20 +496,6 @@ static void blk_trace_check_cpu_time(voi
put_cpu();
}
-/*
- * Call blk_trace_check_cpu_time() on each CPU to calibrate our
inter-CPU
- * timings
- */
-static void blk_trace_calibrate_offsets(void)
-{
- unsigned long flags;
-
- smp_call_function(blk_trace_check_cpu_time, NULL, 1, 1);
- local_irq_save(flags);
- blk_trace_check_cpu_time(NULL);
- local_irq_restore(flags);
-}
-
static void blk_trace_set_ht_offsets(void)
{
#if defined(CONFIG_SCHED_SMT)
@@ -535,7 +524,7 @@ static void blk_trace_set_ht_offsets(voi
static __init int blk_trace_init(void)
{
mutex_init(&blk_tree_mutex);
- blk_trace_calibrate_offsets();
+ on_each_cpu(blk_trace_check_cpu_time, NULL, 1, 1);
blk_trace_set_ht_offsets();
return 0;
-
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