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Commit a74b2ada authored by Ricky Benitez's avatar Ricky Benitez Committed by Jens Axboe
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block: expose the statistics in blkio.time and blkio.sectors for the root cgroup 



Currently, the io statistics for the root cgroup are maintained, but
they are not shown because the device information is not available at
the point that the root blkio cgroup is created. This patch updates
the device information when the statistics are updated so that the
statistics become visible.

Signed-off-by: default avatarRicky Benitez <rickyb@google.com>
Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 14421453

block/cfq-iosched.c

+5 −0
Original line number Diff line number Diff line
@@ -948,6 +948,11 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) 
	unsigned int major, minor;



	cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));

	if (cfqg && !cfqg->blkg.dev && bdi->dev && dev_name(bdi->dev)) {

		sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);

		cfqg->blkg.dev = MKDEV(major, minor);

		goto done;

	}

	if (cfqg || !create)

		goto done;