diff options
| author | Ingo Molnar <mingo@elte.hu> | 2007-07-25 13:07:10 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-07-27 08:08:24 +0200 |
| commit | 7c2ff389bbb33074e7fde7a744f59da199a74af5 (patch) | |
| tree | 37a916fefffa13f5364f4f4a56eeebe9d30bd931 /block/blktrace.c | |
| parent | 4d5d8e9d3e55100bc12cf17a5ebc8a3c70befd38 (diff) | |
| download | linux-7c2ff389bbb33074e7fde7a744f59da199a74af5.tar.gz linux-7c2ff389bbb33074e7fde7a744f59da199a74af5.tar.bz2 linux-7c2ff389bbb33074e7fde7a744f59da199a74af5.zip | |
blktrace: use cpu_clock() instead of sched_clock()
use cpu_clock() instead of sched_clock(). (the latter is not a proper
clock-source)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blktrace.c')
| -rw-r--r-- | block/blktrace.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/block/blktrace.c b/block/blktrace.c index 20c3e22587b5..20fa034ea4a2 100644 --- a/block/blktrace.c +++ b/block/blktrace.c @@ -41,7 +41,7 @@ static void trace_note(struct blk_trace *bt, pid_t pid, int action, const int cpu = smp_processor_id(); t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; - t->time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu); + t->time = cpu_clock(cpu) - per_cpu(blk_trace_cpu_offset, cpu); t->device = bt->dev; t->action = action; t->pid = pid; @@ -159,7 +159,7 @@ void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION; t->sequence = ++(*sequence); - t->time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu); + t->time = cpu_clock(cpu) - per_cpu(blk_trace_cpu_offset, cpu); t->sector = sector; t->bytes = bytes; t->action = what; @@ -488,17 +488,17 @@ void blk_trace_shutdown(struct request_queue *q) } /* - * Average offset over two calls to sched_clock() with a gettimeofday() + * Average offset over two calls to cpu_clock() with a gettimeofday() * in the middle */ -static void blk_check_time(unsigned long long *t) +static void blk_check_time(unsigned long long *t, int this_cpu) { unsigned long long a, b; struct timeval tv; - a = sched_clock(); + a = cpu_clock(this_cpu); do_gettimeofday(&tv); - b = sched_clock(); + b = cpu_clock(this_cpu); *t = tv.tv_sec * 1000000000 + tv.tv_usec * 1000; *t -= (a + b) / 2; @@ -510,16 +510,16 @@ static void blk_check_time(unsigned long long *t) static void blk_trace_check_cpu_time(void *data) { unsigned long long *t; - int cpu = get_cpu(); + int this_cpu = get_cpu(); - t = &per_cpu(blk_trace_cpu_offset, cpu); + t = &per_cpu(blk_trace_cpu_offset, this_cpu); /* * Just call it twice, hopefully the second call will be cache hot * and a little more precise */ - blk_check_time(t); - blk_check_time(t); + blk_check_time(t, this_cpu); + blk_check_time(t, this_cpu); put_cpu(); } |