On the legacy request_queue, each blkcg_gq has a dedicated request_list that requests for the cgroup are allocated from. Each request points to the originating request_list and cgroup membership can be determined by examining which cgroup the associated request_list belongs to. This doesn't work for blk-mq which doesn't use request_list. Let's associate each request with the blkcg_gq directly. Except for minor wrapper changes, this doesn't affect the legacy request_queue and will allow blk-mq to track each request's cgroup association. Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> --- block/blk-mq.c | 2 +- include/linux/blk-cgroup.h | 9 ++++++--- include/linux/blkdev.h | 2 +- 3 files changed, 8 insertions(+), 5 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 98a1860..af958c4 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -306,7 +306,7 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data, rq->part = NULL; rq->start_time = jiffies; #ifdef CONFIG_BLK_CGROUP - rq->rl = NULL; + rq->blkg = NULL; set_start_time_ns(rq); rq->io_start_time_ns = 0; #endif diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index c0d4736..b5721d32 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -463,7 +463,7 @@ static inline void blk_put_rl(struct request_list *rl) */ static inline void blk_rq_set_rl(struct request *rq, struct request_list *rl) { - rq->rl = rl; + rq->blkg = rl->blkg; } /** @@ -474,7 +474,10 @@ static inline void blk_rq_set_rl(struct request *rq, struct request_list *rl) */ static inline struct request_list *blk_rq_rl(struct request *rq) { - return rq->rl; + if (!rq->blkg->parent) + return &rq->q->root_rl; + else + return &rq->blkg->rl; } struct request_list *__blk_queue_next_rl(struct request_list *rl, @@ -762,7 +765,7 @@ static inline void blkg_put(struct blkcg_gq *blkg) { } static inline struct request_list *blk_get_rl(struct request_queue *q, struct bio *bio) { return &q->root_rl; } static inline void blk_put_rl(struct request_list *rl) { } -static inline void blk_rq_set_rl(struct request *rq, struct request_list *rl) { } +static inline void blk_rq_set_blkg(struct request *rq, struct blkcg_gq *blkg) { } static inline struct request_list *blk_rq_rl(struct request *rq) { return &rq->q->root_rl; } static inline bool blkcg_bio_issue_check(struct request_queue *q, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 8da6637..6ec1067 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -206,7 +206,7 @@ struct request { unsigned long start_time; struct blk_issue_stat issue_stat; #ifdef CONFIG_BLK_CGROUP - struct request_list *rl; /* rl this rq is alloced from */ + struct blkcg_gq *blkg; /* blkg of this rq */ unsigned long long start_time_ns; unsigned long long io_start_time_ns; /* when passed to hardware */ #endif -- 2.9.5 -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html