Merge branch 'for-2.6.33' of git://git.kernel.dk/linux-2.6-block
* 'for-2.6.33' of git://git.kernel.dk/linux-2.6-block:
cfq: set workload as expired if it doesn't have any slice left
Fix a CFQ crash in "for-2.6.33" branch of block tree
cfq: Remove wait_request flag when idle time is being deleted
cfq-iosched: commenting non-obvious initialization
cfq-iosched: Take care of corner cases of group losing share due to deletion
cfq-iosched: Get rid of cfqq wait_busy_done flag
cfq: Optimization for close cooperating queue searching
block,xd: Delay allocation of DMA buffers until device is known
drbd: Following the hmac change to SHASH (see linux commit 8bd1209cfff)
cfq-iosched: reduce write depth only if sync was delayed
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index cfb0b2f..e2f8046 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -283,7 +283,7 @@
*/
struct cfq_queue oom_cfqq;
- unsigned long last_end_sync_rq;
+ unsigned long last_delayed_sync;
/* List of cfq groups being managed on this device*/
struct hlist_head cfqg_list;
@@ -319,7 +319,6 @@
CFQ_CFQQ_FLAG_coop, /* cfqq is shared */
CFQ_CFQQ_FLAG_deep, /* sync cfqq experienced large depth */
CFQ_CFQQ_FLAG_wait_busy, /* Waiting for next request */
- CFQ_CFQQ_FLAG_wait_busy_done, /* Got new request. Expire the queue */
};
#define CFQ_CFQQ_FNS(name) \
@@ -348,7 +347,6 @@
CFQ_CFQQ_FNS(coop);
CFQ_CFQQ_FNS(deep);
CFQ_CFQQ_FNS(wait_busy);
-CFQ_CFQQ_FNS(wait_busy_done);
#undef CFQ_CFQQ_FNS
#ifdef CONFIG_DEBUG_CFQ_IOSCHED
@@ -1574,7 +1572,6 @@
cfq_clear_cfqq_wait_request(cfqq);
cfq_clear_cfqq_wait_busy(cfqq);
- cfq_clear_cfqq_wait_busy_done(cfqq);
/*
* store what was left of this slice, if the queue idled/timed out
@@ -1750,6 +1747,12 @@
return NULL;
/*
+ * Don't search priority tree if it's the only queue in the group.
+ */
+ if (cur_cfqq->cfqg->nr_cfqq == 1)
+ return NULL;
+
+ /*
* We should notice if some of the queues are cooperating, eg
* working closely on the same area of the disk. In that case,
* we can group them together and don't waste time idling.
@@ -2110,7 +2113,9 @@
cfqd->workload_expires = jiffies + cfqg->saved_workload_slice;
cfqd->serving_type = cfqg->saved_workload;
cfqd->serving_prio = cfqg->saved_serving_prio;
- }
+ } else
+ cfqd->workload_expires = jiffies - 1;
+
choose_service_tree(cfqd, cfqg);
}
@@ -2128,12 +2133,33 @@
if (!cfqd->rq_queued)
return NULL;
+
+ /*
+ * We were waiting for group to get backlogged. Expire the queue
+ */
+ if (cfq_cfqq_wait_busy(cfqq) && !RB_EMPTY_ROOT(&cfqq->sort_list))
+ goto expire;
+
/*
* The active queue has run out of time, expire it and select new.
*/
- if ((cfq_slice_used(cfqq) || cfq_cfqq_wait_busy_done(cfqq))
- && !cfq_cfqq_must_dispatch(cfqq))
- goto expire;
+ if (cfq_slice_used(cfqq) && !cfq_cfqq_must_dispatch(cfqq)) {
+ /*
+ * If slice had not expired at the completion of last request
+ * we might not have turned on wait_busy flag. Don't expire
+ * the queue yet. Allow the group to get backlogged.
+ *
+ * The very fact that we have used the slice, that means we
+ * have been idling all along on this queue and it should be
+ * ok to wait for this request to complete.
+ */
+ if (cfqq->cfqg->nr_cfqq == 1 && RB_EMPTY_ROOT(&cfqq->sort_list)
+ && cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) {
+ cfqq = NULL;
+ goto keep_queue;
+ } else
+ goto expire;
+ }
/*
* The active queue has requests and isn't expired, allow it to
@@ -2264,7 +2290,7 @@
* based on the last sync IO we serviced
*/
if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) {
- unsigned long last_sync = jiffies - cfqd->last_end_sync_rq;
+ unsigned long last_sync = jiffies - cfqd->last_delayed_sync;
unsigned int depth;
depth = last_sync / cfqd->cfq_slice[1];
@@ -3165,10 +3191,6 @@
cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
if (cfqq == cfqd->active_queue) {
- if (cfq_cfqq_wait_busy(cfqq)) {
- cfq_clear_cfqq_wait_busy(cfqq);
- cfq_mark_cfqq_wait_busy_done(cfqq);
- }
/*
* Remember that we saw a request from this process, but
* don't start queuing just yet. Otherwise we risk seeing lots
@@ -3183,6 +3205,7 @@
if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE ||
cfqd->busy_queues > 1) {
del_timer(&cfqd->idle_slice_timer);
+ cfq_clear_cfqq_wait_request(cfqq);
__blk_run_queue(cfqd->queue);
} else
cfq_mark_cfqq_must_dispatch(cfqq);
@@ -3251,6 +3274,35 @@
cfqd->hw_tag = 0;
}
+static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq)
+{
+ struct cfq_io_context *cic = cfqd->active_cic;
+
+ /* If there are other queues in the group, don't wait */
+ if (cfqq->cfqg->nr_cfqq > 1)
+ return false;
+
+ if (cfq_slice_used(cfqq))
+ 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))
+ return true;
+
+ /*
+ * If think times is less than a jiffy than ttime_mean=0 and above
+ * will not be true. It might happen that slice has not expired yet
+ * but will expire soon (4-5 ns) during select_queue(). To cover the
+ * case where think time is less than a jiffy, mark the queue wait
+ * busy if only 1 jiffy is left in the slice.
+ */
+ if (cfqq->slice_end - jiffies == 1)
+ return true;
+
+ return false;
+}
+
static void cfq_completed_request(struct request_queue *q, struct request *rq)
{
struct cfq_queue *cfqq = RQ_CFQQ(rq);
@@ -3273,7 +3325,8 @@
if (sync) {
RQ_CIC(rq)->last_end_request = now;
- cfqd->last_end_sync_rq = now;
+ if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now))
+ cfqd->last_delayed_sync = now;
}
/*
@@ -3289,11 +3342,10 @@
}
/*
- * If this queue consumed its slice and this is last queue
- * in the group, wait for next request before we expire
- * the queue
+ * Should we wait for next request to come in before we expire
+ * the queue.
*/
- if (cfq_slice_used(cfqq) && cfqq->cfqg->nr_cfqq == 1) {
+ if (cfq_should_wait_busy(cfqd, cfqq)) {
cfqq->slice_end = jiffies + cfqd->cfq_slice_idle;
cfq_mark_cfqq_wait_busy(cfqq);
}
@@ -3711,7 +3763,11 @@
cfqd->cfq_latency = 1;
cfqd->cfq_group_isolation = 0;
cfqd->hw_tag = -1;
- cfqd->last_end_sync_rq = jiffies;
+ /*
+ * we optimistically start assuming sync ops weren't delayed in last
+ * second, in order to have larger depth for async operations.
+ */
+ cfqd->last_delayed_sync = jiffies - HZ;
INIT_RCU_HEAD(&cfqd->rcu);
return cfqd;
}
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 436a090..4e0726a 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1271,8 +1271,7 @@
goto fail;
}
- if (crypto_tfm_alg_type(crypto_hash_tfm(tfm))
- != CRYPTO_ALG_TYPE_HASH) {
+ if (crypto_tfm_alg_type(crypto_hash_tfm(tfm)) != CRYPTO_ALG_TYPE_SHASH) {
retcode = ERR_AUTH_ALG_ND;
goto fail;
}
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index 0877d36..d1fd032 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -169,13 +169,6 @@
init_timer (&xd_watchdog_int); xd_watchdog_int.function = xd_watchdog;
- if (!xd_dma_buffer)
- xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
- if (!xd_dma_buffer) {
- printk(KERN_ERR "xd: Out of memory.\n");
- return -ENOMEM;
- }
-
err = -EBUSY;
if (register_blkdev(XT_DISK_MAJOR, "xd"))
goto out1;
@@ -202,6 +195,19 @@
xd_drives,xd_drives == 1 ? "" : "s",xd_irq,xd_dma);
}
+ /*
+ * With the drive detected, xd_maxsectors should now be known.
+ * If xd_maxsectors is 0, nothing was detected and we fall through
+ * to return -ENODEV
+ */
+ if (!xd_dma_buffer && xd_maxsectors) {
+ xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
+ if (!xd_dma_buffer) {
+ printk(KERN_ERR "xd: Out of memory.\n");
+ goto out3;
+ }
+ }
+
err = -ENODEV;
if (!xd_drives)
goto out3;
@@ -249,15 +255,17 @@
for (i = 0; i < xd_drives; i++)
put_disk(xd_gendisk[i]);
out3:
- release_region(xd_iobase,4);
+ if (xd_maxsectors)
+ release_region(xd_iobase,4);
+
+ if (xd_dma_buffer)
+ xd_dma_mem_free((unsigned long)xd_dma_buffer,
+ xd_maxsectors * 0x200);
out2:
blk_cleanup_queue(xd_queue);
out1a:
unregister_blkdev(XT_DISK_MAJOR, "xd");
out1:
- if (xd_dma_buffer)
- xd_dma_mem_free((unsigned long)xd_dma_buffer,
- xd_maxsectors * 0x200);
return err;
Enomem:
err = -ENOMEM;