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Subject[PATCH] ifdef blktrace debugging fields
On Tue, Aug 01, 2006 at 09:44:36AM +0200, Jens Axboe wrote:
> Certainly. If Alexey adds the blkdev.h bit as well, we can go ahead with
> it.

Done. Originally I looked at slab size of task_struct and still
recovering.

[PATCH] ifdef blktrace debugging fields

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

block/ll_rw_blk.c | 4 ++--
include/linux/blkdev.h | 4 ++--
include/linux/sched.h | 3 ++-
kernel/fork.c | 2 ++
4 files changed, 8 insertions(+), 5 deletions(-)

--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1779,10 +1779,10 @@ static void blk_release_queue(struct kob

if (q->queue_tags)
__blk_queue_free_tags(q);
-
+#ifdef CONFIG_BLK_DEV_IO_TRACE
if (q->blk_trace)
blk_trace_shutdown(q);
-
+#endif
kmem_cache_free(requestq_cachep, q);
}

--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -417,9 +417,9 @@ struct request_queue
unsigned int sg_timeout;
unsigned int sg_reserved_size;
int node;
-
+#ifdef CONFIG_BLK_DEV_IO_TRACE
struct blk_trace *blk_trace;
-
+#endif
/*
* reserved for flush operations
*/
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -784,8 +784,9 @@ #endif
struct prio_array *array;

unsigned short ioprio;
+#ifdef CONFIG_BLK_DEV_IO_TRACE
unsigned int btrace_seq;
-
+#endif
unsigned long sleep_avg;
unsigned long long timestamp, last_ran;
unsigned long long sched_time; /* sched_clock time spent running */
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -177,7 +177,9 @@ static struct task_struct *dup_task_stru
/* One for us, one for whoever does the "release_task()" (usually parent) */
atomic_set(&tsk->usage,2);
atomic_set(&tsk->fs_excl, 0);
+#ifdef CONFIG_BLK_DEV_IO_TRACE
tsk->btrace_seq = 0;
+#endif
tsk->splice_pipe = NULL;
return tsk;
}
-
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