[PATCH 0/3] blkio: IO controller stats
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From: Divyesh Shah on 1 Apr 2010 18:10 The following series implements some additional stats for IO controller. These stats have helped us debug issues with earlier IO controller versions and should be useful now as well. We've been using these stats for monitoring and debugging problems after the fact as these stats can be collected and stored for later use. One might argue that most of this information can be exported using blktrace when debugging. However, blktrace has non-trivial performance impact and cannot be always turned on. These stats provide a way for continuous monitoring without losing much performance on rotational disks. We've been able to look at these stats and debug issues after problems have been reported in the wild and understand the IO pattern of the affected workloads. Some of these stats are also a good data source for high-level analysis and capacity planning. This patchset adds 4 stats and I will send out another patchset later for stats like io_merged and some stats that can be turned on only for debugging - idle_time (total time spent idling for this blkio_group), wait_time (total time spent by the blkio_group waiting before any one of its queues got a timeslice). I've tried to breakdown the stats and sent the most basic ones here. --- Divyesh Shah (3): Increment the blkio cgroup stats for real now. Add io controller stats like Remove per-cfqq nr_sectors as we'll be passing that info at request dispatch block/blk-cgroup.c | 239 ++++++++++++++++++++++++++++++++++++++++++++---- block/blk-cgroup.h | 57 +++++++++-- block/blk-core.c | 6 + block/cfq-iosched.c | 14 +-- include/linux/blkdev.h | 20 ++++ 5 files changed, 291 insertions(+), 45 deletions(-) -- Divyesh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |