linux-kernel - [PATCH] ifdef blktrace debugging fields

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Date:	Tue, 1 Aug 2006 17:47:03 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Jens Axboe <axboe@...e.de>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
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@...il.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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