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authorVivek Goyal <vgoyal@redhat.com>2009-12-03 17:59:49 (GMT)
committerJens Axboe <jens.axboe@oracle.com>2009-12-03 18:28:52 (GMT)
commit220841906fccafaf4094e87bdb6d252e20cf8c7c (patch)
treef25b1f057887cf2a05bb8309e0b757149e052797 /block/blk-cgroup.c
parent2868ef7b39490e6b41c2c61cd9a5cd891e778b54 (diff)
blkio: Export disk time and sectors used by a group to user space
o Export disk time and sector used by a group to user space through cgroup interface. o Also export a "dequeue" interface to cgroup which keeps track of how many a times a group was deleted from service tree. Helps in debugging. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-cgroup.c')
-rw-r--r--block/blk-cgroup.c64
1 files changed, 63 insertions, 1 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 6bc99a3..4ef78d3 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -11,6 +11,8 @@
* Nauman Rafique <nauman@google.com>
*/
#include <linux/ioprio.h>
+#include <linux/seq_file.h>
+#include <linux/kdev_t.h>
#include "blk-cgroup.h"
extern void cfq_unlink_blkio_group(void *, struct blkio_group *);
@@ -23,8 +25,15 @@ struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
struct blkio_cgroup, css);
}
+void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
+ unsigned long time, unsigned long sectors)
+{
+ blkg->time += time;
+ blkg->sectors += sectors;
+}
+
void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, void *key)
+ struct blkio_group *blkg, void *key, dev_t dev)
{
unsigned long flags;
@@ -37,6 +46,7 @@ void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
/* Need to take css reference ? */
cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
#endif
+ blkg->dev = dev;
}
static void __blkiocg_del_blkio_group(struct blkio_group *blkg)
@@ -115,12 +125,64 @@ blkiocg_weight_write(struct cgroup *cgroup, struct cftype *cftype, u64 val)
return 0;
}
+#define SHOW_FUNCTION_PER_GROUP(__VAR) \
+static int blkiocg_##__VAR##_read(struct cgroup *cgroup, \
+ struct cftype *cftype, struct seq_file *m) \
+{ \
+ struct blkio_cgroup *blkcg; \
+ struct blkio_group *blkg; \
+ struct hlist_node *n; \
+ \
+ if (!cgroup_lock_live_group(cgroup)) \
+ return -ENODEV; \
+ \
+ blkcg = cgroup_to_blkio_cgroup(cgroup); \
+ rcu_read_lock(); \
+ hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) {\
+ if (blkg->dev) \
+ seq_printf(m, "%u:%u %lu\n", MAJOR(blkg->dev), \
+ MINOR(blkg->dev), blkg->__VAR); \
+ } \
+ rcu_read_unlock(); \
+ cgroup_unlock(); \
+ return 0; \
+}
+
+SHOW_FUNCTION_PER_GROUP(time);
+SHOW_FUNCTION_PER_GROUP(sectors);
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+SHOW_FUNCTION_PER_GROUP(dequeue);
+#endif
+#undef SHOW_FUNCTION_PER_GROUP
+
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
+ unsigned long dequeue)
+{
+ blkg->dequeue += dequeue;
+}
+#endif
+
struct cftype blkio_files[] = {
{
.name = "weight",
.read_u64 = blkiocg_weight_read,
.write_u64 = blkiocg_weight_write,
},
+ {
+ .name = "time",
+ .read_seq_string = blkiocg_time_read,
+ },
+ {
+ .name = "sectors",
+ .read_seq_string = blkiocg_sectors_read,
+ },
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ {
+ .name = "dequeue",
+ .read_seq_string = blkiocg_dequeue_read,
+ },
+#endif
};
static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup)

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