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Commit dc6d36c9 authored by Jens Axboe's avatar Jens Axboe
Browse files

block: readd plug trace event 



This was removed with the queue plug state. But we can easily readd
by checking if this is the first request going to this queue. It's
good information to have when tracing to see how effective the
plugging is.

Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent f7566457

block/blk-core.c

+9 −1
Original line number Original line Diff line number Diff line
@@ -1311,7 +1311,15 @@ get_rq: 




	plug = current->plug;

	plug = current->plug;

	if (plug) {

	if (plug) {

		if (!plug->should_sort && !list_empty(&plug->list)) {

		/*

		 * If this is the first request added after a plug, fire

		 * of a plug trace. If others have been added before, check

		 * if we have multiple devices in this plug. If so, make a

		 * note to sort the list before dispatch.

		 */

		if (list_empty(&plug->list))

			trace_block_plug(q);

		else if (!plug->should_sort) {

			struct request *__rq;

			struct request *__rq;





			__rq = list_entry_rq(plug->list.prev);

			__rq = list_entry_rq(plug->list.prev);