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Date: Tue, 22 Jan 2008 10:49:18 +0100
From: Jens Axboe <jens.axboe@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: knikanth@...ell.com, Nikanth Karthikesan <KNikanth@...ell.com>
Subject: [PATCH 3/6] io_context sharing - cfq changes
From: Nikanth Karthikesan <KNikanth@...ell.com>
changes in the cfq for io_context sharing
Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
block/cfq-iosched.c | 20 ++++++++++++++++++--
1 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 533af75..dba52b6 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -895,7 +895,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
* task has exited, don't wait
*/
cic = cfqd->active_cic;
- if (!cic || !cic->ioc->task)
+ if (!cic || !atomic_read(&cic->ioc->nr_tasks))
return;
/*
@@ -1178,6 +1178,8 @@ static void cfq_free_io_context(struct io_context *ioc)
ioc->ioc_data = NULL;
+ spin_lock(&ioc->lock);
+
while ((n = rb_first(&ioc->cic_root)) != NULL) {
__cic = rb_entry(n, struct cfq_io_context, rb_node);
rb_erase(&__cic->rb_node, &ioc->cic_root);
@@ -1189,6 +1191,8 @@ static void cfq_free_io_context(struct io_context *ioc)
if (ioc_gone && !elv_ioc_count_read(ioc_count))
complete(ioc_gone);
+
+ spin_unlock(&ioc->lock);
}
static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq)
@@ -1243,6 +1247,7 @@ static void cfq_exit_io_context(struct io_context *ioc)
ioc->ioc_data = NULL;
+ spin_lock(&ioc->lock);
/*
* put the reference this task is holding to the various queues
*/
@@ -1253,6 +1258,8 @@ static void cfq_exit_io_context(struct io_context *ioc)
cfq_exit_single_io_context(__cic);
n = rb_next(n);
}
+
+ spin_unlock(&ioc->lock);
}
static struct cfq_io_context *
@@ -1349,6 +1356,8 @@ static void cfq_ioc_set_ioprio(struct io_context *ioc)
struct cfq_io_context *cic;
struct rb_node *n;
+ spin_lock(&ioc->lock);
+
ioc->ioprio_changed = 0;
n = rb_first(&ioc->cic_root);
@@ -1358,6 +1367,8 @@ static void cfq_ioc_set_ioprio(struct io_context *ioc)
changed_ioprio(cic);
n = rb_next(n);
}
+
+ spin_unlock(&ioc->lock);
}
static struct cfq_queue *
@@ -1502,6 +1513,7 @@ cfq_cic_rb_lookup(struct cfq_data *cfqd, struct io_context *ioc)
if (cic && cic->key == cfqd)
return cic;
+ spin_lock(&ioc->lock);
restart:
n = ioc->cic_root.rb_node;
while (n) {
@@ -1519,10 +1531,12 @@ restart:
n = n->rb_right;
else {
ioc->ioc_data = cic;
+ spin_unlock(&ioc->lock);
return cic;
}
}
+ spin_unlock(&ioc->lock);
return NULL;
}
@@ -1536,6 +1550,7 @@ cfq_cic_link(struct cfq_data *cfqd, struct io_context *ioc,
unsigned long flags;
void *k;
+ spin_lock(&ioc->lock);
cic->ioc = ioc;
cic->key = cfqd;
@@ -1566,6 +1581,7 @@ restart:
spin_lock_irqsave(cfqd->queue->queue_lock, flags);
list_add(&cic->queue_list, &cfqd->cic_list);
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);
+ spin_unlock(&ioc->lock);
}
/*
@@ -1659,7 +1675,7 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
enable_idle = cfq_cfqq_idle_window(cfqq);
- if (!cic->ioc->task || !cfqd->cfq_slice_idle ||
+ if (!atomic_read(&cic->ioc->nr_tasks) || !cfqd->cfq_slice_idle ||
(cfqd->hw_tag && CIC_SEEKY(cic)))
enable_idle = 0;
else if (sample_valid(cic->ttime_samples)) {
--
1.5.4.rc2.84.gf85fd
--
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