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 set, async queue pointer is not cached and we take help of bio tracking patches to determine group bio belongs to and then map it to async queue of that group. Signed-off-by: Nauman Rafique <nauman@xxxxxxxxxx> Signed-off-by: Gui Jianfeng <guijianfeng@xxxxxxxxxxxxxx> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx> -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
