Commit a74b2ada authored Apr 05, 2010 by Ricky Benitez Committed by Jens Axboe Apr 05, 2010

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: Ricky Benitez <rickyb@google.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens 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;

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