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Date: Tue, 12 Jul 2011 09:37:56 +0800
From: Shaohua Li <shaohua.li@...el.com>
To: lkml <linux-kernel@...r.kernel.org>
Cc: Jens Axboe <jaxboe@...ionio.com>, Vivek Goyal <vgoyal@...hat.com>
Subject: [PATCH 1/3]CFQ: move think time check variables to a separate
struct
Subject: CFQ: move think time check variables to a separate struct
Move the variables to do think time check to a sepatate struct. This is to prepare
adding think time check for service tree and group. No functional change.
Signed-off-by: Shaohua Li <shaohua.li@...el.com>
---
block/cfq-iosched.c | 40 ++++++++++++++++++++++++----------------
include/linux/iocontext.h | 14 +++++++++-----
2 files changed, 33 insertions(+), 21 deletions(-)
Index: linux/block/cfq-iosched.c
===================================================================
--- linux.orig/block/cfq-iosched.c 2011-07-12 09:18:55.000000000 +0800
+++ linux/block/cfq-iosched.c 2011-07-12 09:19:06.000000000 +0800
@@ -2022,10 +2022,10 @@ static void cfq_arm_slice_timer(struct c
* slice, then don't idle. This avoids overrunning the allotted
* time slice.
*/
- if (sample_valid(cic->ttime_samples) &&
- (cfqq->slice_end - jiffies < cic->ttime_mean)) {
+ if (sample_valid(cic->ttime.ttime_samples) &&
+ (cfqq->slice_end - jiffies < cic->ttime.ttime_mean)) {
cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%lu",
- cic->ttime_mean);
+ cic->ttime.ttime_mean);
return;
}
@@ -2833,7 +2833,7 @@ cfq_alloc_io_context(struct cfq_data *cf
cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask | __GFP_ZERO,
cfqd->queue->node);
if (cic) {
- cic->last_end_request = jiffies;
+ cic->ttime.last_end_request = jiffies;
INIT_LIST_HEAD(&cic->queue_list);
INIT_HLIST_NODE(&cic->cic_list);
cic->dtor = cfq_free_io_context;
@@ -3221,14 +3221,22 @@ err:
}
static void
-cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic)
+__cfq_update_io_thinktime(struct cfq_ttime *ttime, unsigned long slice_idle)
{
- unsigned long elapsed = jiffies - cic->last_end_request;
- unsigned long ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle);
+ unsigned long elapsed = jiffies - ttime->last_end_request;
+ elapsed = min(elapsed, 2UL * slice_idle);
- cic->ttime_samples = (7*cic->ttime_samples + 256) / 8;
- cic->ttime_total = (7*cic->ttime_total + 256*ttime) / 8;
- cic->ttime_mean = (cic->ttime_total + 128) / cic->ttime_samples;
+ ttime->ttime_samples = (7*ttime->ttime_samples + 256) / 8;
+ ttime->ttime_total = (7*ttime->ttime_total + 256*elapsed) / 8;
+ ttime->ttime_mean = (ttime->ttime_total + 128) / ttime->ttime_samples;
+}
+
+static void
+cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_queue *cfqq,
+ struct cfq_io_context *cic)
+{
+ if (cfq_cfqq_sync(cfqq))
+ __cfq_update_io_thinktime(&cic->ttime, cfqd->cfq_slice_idle);
}
static void
@@ -3277,8 +3285,8 @@ cfq_update_idle_window(struct cfq_data *
else if (!atomic_read(&cic->ioc->nr_tasks) || !cfqd->cfq_slice_idle ||
(!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq)))
enable_idle = 0;
- else if (sample_valid(cic->ttime_samples)) {
- if (cic->ttime_mean > cfqd->cfq_slice_idle)
+ else if (sample_valid(cic->ttime.ttime_samples)) {
+ if (cic->ttime.ttime_mean > cfqd->cfq_slice_idle)
enable_idle = 0;
else
enable_idle = 1;
@@ -3413,7 +3421,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, s
if (rq->cmd_flags & REQ_META)
cfqq->meta_pending++;
- cfq_update_io_thinktime(cfqd, cic);
+ cfq_update_io_thinktime(cfqd, cfqq, cic);
cfq_update_io_seektime(cfqd, cfqq, rq);
cfq_update_idle_window(cfqd, cfqq, cic);
@@ -3524,8 +3532,8 @@ static bool cfq_should_wait_busy(struct
return true;
/* if slice left is less than think time, wait busy */
- if (cic && sample_valid(cic->ttime_samples)
- && (cfqq->slice_end - jiffies < cic->ttime_mean))
+ if (cic && sample_valid(cic->ttime.ttime_samples)
+ && (cfqq->slice_end - jiffies < cic->ttime.ttime_mean))
return true;
/*
@@ -3566,7 +3574,7 @@ static void cfq_completed_request(struct
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
if (sync) {
- RQ_CIC(rq)->last_end_request = now;
+ RQ_CIC(rq)->ttime.last_end_request = now;
if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now))
cfqd->last_delayed_sync = now;
}
Index: linux/include/linux/iocontext.h
===================================================================
--- linux.orig/include/linux/iocontext.h 2011-07-12 09:18:55.000000000 +0800
+++ linux/include/linux/iocontext.h 2011-07-12 09:19:06.000000000 +0800
@@ -5,6 +5,14 @@
#include <linux/rcupdate.h>
struct cfq_queue;
+struct cfq_ttime {
+ unsigned long last_end_request;
+
+ unsigned long ttime_total;
+ unsigned long ttime_samples;
+ unsigned long ttime_mean;
+};
+
struct cfq_io_context {
void *key;
@@ -12,11 +20,7 @@ struct cfq_io_context {
struct io_context *ioc;
- unsigned long last_end_request;
-
- unsigned long ttime_total;
- unsigned long ttime_samples;
- unsigned long ttime_mean;
+ struct cfq_ttime ttime;
struct list_head queue_list;
struct hlist_node cic_list;
--
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