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Subject[PATCH 6/7] iosched: run elv_kick_page() on sync read
Call elv_kick_page() to notify the elevator of a pending read.

Requests of priority IOPRIO_CLASS_IDLE are ignored.

Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
---

--- linux-2.6.17-rc5-mm3.orig/block/ll_rw_blk.c
+++ linux-2.6.17-rc5-mm3/block/ll_rw_blk.c
@@ -1619,6 +1619,9 @@ static void blk_backing_dev_unplug(struc
{
request_queue_t *q = bdi->unplug_io_data;

+ if (IOPRIO_PRIO_CLASS(current->ioprio) != IOPRIO_CLASS_IDLE)
+ elv_kick_page(q, page);
+
/*
* devices don't necessarily have an ->unplug_fn defined
*/
--- linux-2.6.17-rc5-mm3.orig/fs/buffer.c
+++ linux-2.6.17-rc5-mm3/fs/buffer.c
@@ -63,8 +63,9 @@ static int sync_buffer(void *word)

smp_mb();
bd = bh->b_bdev;
- if (bd)
- blk_run_address_space(bd->bd_inode->i_mapping);
+ if (bd && bd->bd_inode && bd->bd_inode->i_mapping)
+ blk_run_backing_dev(bd->bd_inode->i_mapping->backing_dev_info,
+ bh->b_page);
io_schedule();
return 0;
}
--
-
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