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authorFengguang Wu <wfg@mail.ustc.edu.cn>2007-10-16 01:24:36 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:53 -0700
commitf2e189827a914b66e435e68b1c9e37775cb995ed (patch)
treefa5748fa0ecdef500c616c28d2885d2385b17e4d /block
parent535443f51543df61111bbd234300ae549d220448 (diff)
readahead: remove the limit max_sectors_kb imposed on max_readahead_kb
Remove the size limit max_sectors_kb imposed on max_readahead_kb. The size restriction is unreasonable. Especially when max_sectors_kb cannot grow larger than max_hw_sectors_kb, which can be rather small for some disk drives. Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Acked-by: Jens Axboe <jens.axboe@oracle.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block')
-rw-r--r--block/ll_rw_blk.c9
1 files changed, 0 insertions, 9 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index d875673e76c..a83823fcd74 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3928,7 +3928,6 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
max_hw_sectors_kb = q->max_hw_sectors >> 1,
page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
- int ra_kb;
if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
return -EINVAL;
@@ -3937,14 +3936,6 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
* values synchronously:
*/
spin_lock_irq(q->queue_lock);
- /*
- * Trim readahead window as well, if necessary:
- */
- ra_kb = q->backing_dev_info.ra_pages << (PAGE_CACHE_SHIFT - 10);
- if (ra_kb > max_sectors_kb)
- q->backing_dev_info.ra_pages =
- max_sectors_kb >> (PAGE_CACHE_SHIFT - 10);
-
q->max_sectors = max_sectors_kb << 1;
spin_unlock_irq(q->queue_lock);