[dm-devel] [PATCH 1/5] block: remove the unused block_sleeprq tracepoint

[Damien Le Moal]

On 2020/12/01 3:03, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Even if it is just repeating the patch title, a commit message would be nice.
You could also mention when the last use of this tracepoint was removed.

> ---
>  include/trace/events/block.h | 18 ------------------
>  kernel/trace/blktrace.c      | 22 ----------------------
>  2 files changed, 40 deletions(-)
> 
> diff --git a/include/trace/events/block.h b/include/trace/events/block.h
> index 34d64ca306b1c7..76459cf750e14d 100644
> --- a/include/trace/events/block.h
> +++ b/include/trace/events/block.h
> @@ -441,24 +441,6 @@ DEFINE_EVENT(block_get_rq, block_getrq,
>  	TP_ARGS(q, bio, rw)
>  );
>  
> -/**
> - * block_sleeprq - waiting to get a free request entry in queue for block IO operation
> - * @q: queue for operation
> - * @bio: pending block IO operation (can be %NULL)
> - * @rw: low bit indicates a read (%0) or a write (%1)
> - *
> - * In the case where a request struct cannot be provided for queue @q
> - * the process needs to wait for an request struct to become
> - * available.  This tracepoint event is generated each time the
> - * process goes to sleep waiting for request struct become available.
> - */
> -DEFINE_EVENT(block_get_rq, block_sleeprq,
> -
> -	TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
> -
> -	TP_ARGS(q, bio, rw)
> -);
> -
>  /**
>   * block_plug - keep operations requests in request queue
>   * @q: request queue to plug
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index a482a37848bff7..ced589df304b57 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -959,25 +959,6 @@ static void blk_add_trace_getrq(void *ignore,
>  	}
>  }
>  
> -
> -static void blk_add_trace_sleeprq(void *ignore,
> -				  struct request_queue *q,
> -				  struct bio *bio, int rw)
> -{
> -	if (bio)
> -		blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0);
> -	else {
> -		struct blk_trace *bt;
> -
> -		rcu_read_lock();
> -		bt = rcu_dereference(q->blk_trace);
> -		if (bt)
> -			__blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ,
> -					0, 0, NULL, 0);
> -		rcu_read_unlock();
> -	}
> -}
> -
>  static void blk_add_trace_plug(void *ignore, struct request_queue *q)
>  {
>  	struct blk_trace *bt;
> @@ -1164,8 +1145,6 @@ static void blk_register_tracepoints(void)
>  	WARN_ON(ret);
>  	ret = register_trace_block_getrq(blk_add_trace_getrq, NULL);
>  	WARN_ON(ret);
> -	ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
> -	WARN_ON(ret);
>  	ret = register_trace_block_plug(blk_add_trace_plug, NULL);
>  	WARN_ON(ret);
>  	ret = register_trace_block_unplug(blk_add_trace_unplug, NULL);
> @@ -1185,7 +1164,6 @@ static void blk_unregister_tracepoints(void)
>  	unregister_trace_block_split(blk_add_trace_split, NULL);
>  	unregister_trace_block_unplug(blk_add_trace_unplug, NULL);
>  	unregister_trace_block_plug(blk_add_trace_plug, NULL);
> -	unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
>  	unregister_trace_block_getrq(blk_add_trace_getrq, NULL);
>  	unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL);
>  	unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);
> 

Otherwise, looks good to me.

Reviewed-by: Damien Le Moal <damien.lemoal at wdc.com>


-- 
Damien Le Moal
Western Digital Research