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authorVivek Goyal <vgoyal@redhat.com>2009-12-03 12:59:54 -0500
committerJens Axboe <jens.axboe@oracle.com>2009-12-03 19:28:53 +0100
commitf26bd1f0a3a31bc5e16d285f5e1b00a56abf6238 (patch)
tree8e49302c146eacdd1cfbe78a6bd3aad2b81c3050 /block
parentf75edf2dc828802d358393be80a6c89e919f8273 (diff)
downloadvexpress-lsk-f26bd1f0a3a31bc5e16d285f5e1b00a56abf6238.tar.gz
blkio: Determine async workload length based on total number of queues
o Async queues are not per group. Instead these are system wide and maintained in root group. Hence their workload slice length should be calculated based on total number of queues in the system and not just queues in the root group. o As root group's default weight is 1000, make sure to charge async queue more in terms of vtime so that it does not get more time on disk because root group has higher weight. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
-rw-r--r--block/cfq-iosched.c36
1 files changed, 31 insertions, 5 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 1cc10489eaf..b9e483d9031 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -408,6 +408,13 @@ static inline int cfq_group_busy_queues_wl(enum wl_prio_t wl,
+ cfqg->service_trees[wl][SYNC_WORKLOAD].count;
}
+static inline int cfqg_busy_async_queues(struct cfq_data *cfqd,
+ struct cfq_group *cfqg)
+{
+ return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count
+ + cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count;
+}
+
static void cfq_dispatch_insert(struct request_queue *, struct request *);
static struct cfq_queue *cfq_get_queue(struct cfq_data *, bool,
struct io_context *, gfp_t);
@@ -895,13 +902,19 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
struct cfq_queue *cfqq)
{
struct cfq_rb_root *st = &cfqd->grp_service_tree;
- unsigned int used_sl;
+ unsigned int used_sl, charge_sl;
+ int nr_sync = cfqg->nr_cfqq - cfqg_busy_async_queues(cfqd, cfqg)
+ - cfqg->service_tree_idle.count;
+
+ BUG_ON(nr_sync < 0);
+ used_sl = charge_sl = cfq_cfqq_slice_usage(cfqq);
- used_sl = cfq_cfqq_slice_usage(cfqq);
+ if (!cfq_cfqq_sync(cfqq) && !nr_sync)
+ charge_sl = cfqq->allocated_slice;
/* Can't update vdisktime while group is on service tree */
cfq_rb_erase(&cfqg->rb_node, st);
- cfqg->vdisktime += cfq_scale_slice(used_sl, cfqg);
+ cfqg->vdisktime += cfq_scale_slice(charge_sl, cfqg);
__cfq_group_service_tree_add(st, cfqg);
/* This group is being expired. Save the context */
@@ -2016,11 +2029,24 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_prio],
cfq_group_busy_queues_wl(cfqd->serving_prio, cfqd, cfqg));
- if (cfqd->serving_type == ASYNC_WORKLOAD)
+ if (cfqd->serving_type == ASYNC_WORKLOAD) {
+ unsigned int tmp;
+
+ /*
+ * Async queues are currently system wide. Just taking
+ * proportion of queues with-in same group will lead to higher
+ * async ratio system wide as generally root group is going
+ * to have higher weight. A more accurate thing would be to
+ * calculate system wide asnc/sync ratio.
+ */
+ tmp = cfq_target_latency * cfqg_busy_async_queues(cfqd, cfqg);
+ tmp = tmp/cfqd->busy_queues;
+ slice = min_t(unsigned, slice, tmp);
+
/* async workload slice is scaled down according to
* the sync/async slice ratio. */
slice = slice * cfqd->cfq_slice[0] / cfqd->cfq_slice[1];
- else
+ } else
/* sync workload slice is at least 2 * cfq_slice_idle */
slice = max(slice, 2 * cfqd->cfq_slice_idle);