[RFC][PATCH 08/11] blkiocg async: Function to search blkcg from css ID
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From: Munehiro Ikeda on 8 Jul 2010 23:30 iotrack stores css ID of blkcg in page_cgroup. The blkcg is what the process which dirtied the page belongs to. This patch introduces a function to search blkcg from the recorded ID. Signed-off-by: Munehiro "Muuhh" Ikeda <m-ikeda(a)ds.jp.nec.com> --- block/blk-cgroup.c | 13 +++++++++++++ block/blk-cgroup.h | 1 + 2 files changed, 14 insertions(+), 0 deletions(-) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index a680964..0756910 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -408,6 +408,19 @@ struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) } EXPORT_SYMBOL_GPL(blkiocg_lookup_group); +/* called under rcu_read_lock(). */ +struct blkio_cgroup *blkiocg_id_to_blkcg(unsigned short id) +{ + struct cgroup_subsys_state *css; + + css = css_lookup(&blkio_subsys, id); + if (!css) + return NULL; + + return container_of(css, struct blkio_cgroup, css); +} +EXPORT_SYMBOL_GPL(blkiocg_id_to_blkcg); + #define SHOW_FUNCTION(__VAR) \ static u64 blkiocg_##__VAR##_read(struct cgroup *cgroup, \ struct cftype *cftype) \ diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 2b866ec..75c73bd 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -216,6 +216,7 @@ extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, extern int blkiocg_del_blkio_group(struct blkio_group *blkg); extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key); +extern struct blkio_cgroup *blkiocg_id_to_blkcg(unsigned short id); void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time); void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes, -- 1.6.2.5 -- 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/ |