On Mon, Jun 22, 2009 at 09:45:41AM +0800, Gui Jianfeng wrote: > Vivek Goyal wrote: > > o So far we were assuming that a bio/rq belongs to the task who is submitting > > it. It did not hold good in case of async writes. This patch makes use of > > blkio_cgroup pataches to attribute the aysnc writes to right group instead > > of task submitting the bio. > > > > o For sync requests, we continue to assume that io belongs to the task > > submitting it. Only in case of async requests, we make use of io tracking > > patches to track the owner cgroup. > > > > o So far cfq always caches the async queue pointer. With async requests now > > not necessarily being tied to submitting task io context, caching the > > pointer will not help for async queues. This patch introduces a new config > > option CONFIG_TRACK_ASYNC_CONTEXT. If this option is not set, cfq retains > > old behavior where async queue pointer is cached in task context. If it > > is not set, async queue pointer is not cached and we take help of bio > > Here "If it is not set" should be "If it is set". Yes, in last line it should be "If it is set". Thanks Gui. Will fix the comment. Vivek -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
