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author | Vivek Goyal <vgoyal@redhat.com> | 2009-12-03 12:59:48 -0500 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2009-12-03 19:28:52 +0100 |
commit | 2868ef7b39490e6b41c2c61cd9a5cd891e778b54 (patch) | |
tree | e50e169e984d8bd201de2f73f98e31a65c028feb /block/cfq-iosched.c | |
parent | b1c3576961847da26c91b1e97f226bb66be5fa3f (diff) | |
download | linux-stable-2868ef7b39490e6b41c2c61cd9a5cd891e778b54.tar.gz linux-stable-2868ef7b39490e6b41c2c61cd9a5cd891e778b54.tar.bz2 linux-stable-2868ef7b39490e6b41c2c61cd9a5cd891e778b54.zip |
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.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 8bc31a50a57f..662d4e55b3c2 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); |