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authorVivek Goyal <vgoyal@redhat.com>2009-12-03 12:59:48 -0500
committerJens Axboe <jens.axboe@oracle.com>2009-12-03 19:28:52 +0100
commit2868ef7b39490e6b41c2c61cd9a5cd891e778b54 (patch)
treee50e169e984d8bd201de2f73f98e31a65c028feb /block/cfq-iosched.c
parentb1c3576961847da26c91b1e97f226bb66be5fa3f (diff)
downloadop-kernel-dev-2868ef7b39490e6b41c2c61cd9a5cd891e778b54.zip
op-kernel-dev-2868ef7b39490e6b41c2c61cd9a5cd891e778b54.tar.gz
blkio: Some debugging aids for CFQ
o Some debugging aids for CFQ. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 8bc31a5..662d4e55 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -341,8 +341,21 @@ CFQ_CFQQ_FNS(coop);
CFQ_CFQQ_FNS(deep);
#undef CFQ_CFQQ_FNS
+#ifdef CONFIG_DEBUG_CFQ_IOSCHED
+#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
+ blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \
+ cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
+ blkg_path(&(cfqq)->cfqg->blkg), ##args);
+
+#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) \
+ blk_add_trace_msg((cfqd)->queue, "%s " fmt, \
+ blkg_path(&(cfqg)->blkg), ##args); \
+
+#else
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args)
+#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0);
+#endif
#define cfq_log(cfqd, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args)
@@ -832,6 +845,7 @@ cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
if (cfqg->nr_cfqq)
return;
+ cfq_log_cfqg(cfqd, cfqg, "del_from_rr group");
cfqg->on_st = false;
cfqd->nr_groups--;
st->total_weight -= cfqg->weight;
@@ -889,6 +903,9 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
cfqg->saved_serving_prio = cfqd->serving_prio;
} else
cfqg->saved_workload_slice = 0;
+
+ cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime,
+ st->min_vdisktime);
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
@@ -3102,7 +3119,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
unsigned long now;
now = jiffies;
- cfq_log_cfqq(cfqd, cfqq, "complete");
+ cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d", !!rq_noidle(rq));
cfq_update_hw_tag(cfqd);
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