From: Fengguang Wu <wfg@mail.ustc.edu.cn>
To: Andrew Morton <akpm@osdl.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH 4/6] remove the limit max_sectors_kb imposed on max_readahead_kb
Date: Fri, 20 Jul 2007 18:07:44 +0800 [thread overview]
Message-ID: <384926280.23246@ustc.edu.cn> (raw)
Message-ID: <20070720101124.350754890@mail.ustc.edu.cn> (raw)
In-Reply-To: 20070720100740.106917381@mail.ustc.edu.cn
[-- Attachment #1: remove-readahead-size-limit.patch --]
[-- Type: text/plain, Size: 1162 bytes --]
Remove the size limit max_sectors_kb imposed on max_readahead_kb.
max_sectors_kb cannot grow larger than max_hw_sectors_kb, which can be
rather small for some disk drives.
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
---
block/ll_rw_blk.c | 9 ---------
1 file changed, 9 deletions(-)
--- linux-2.6.22-rc6-mm1.orig/block/ll_rw_blk.c
+++ linux-2.6.22-rc6-mm1/block/ll_rw_blk.c
@@ -3945,7 +3945,6 @@ queue_max_sectors_store(struct request_q
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;
@@ -3954,14 +3953,6 @@ queue_max_sectors_store(struct request_q
* 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);
--
next prev parent reply other threads:[~2007-07-20 10:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070720100740.106917381@mail.ustc.edu.cn>
2007-07-20 10:07 ` [PATCH 0/6] readahead cleanups and interleaved readahead Fengguang Wu
[not found] ` <20070720101123.936159499@mail.ustc.edu.cn>
2007-07-20 10:07 ` [PATCH 1/6] compacting file_ra_state Fengguang Wu
[not found] ` <p73y7hbux4d.fsf@bingen.suse.de>
[not found] ` <20070720121143.GA8584@mail.ustc.edu.cn>
2007-07-20 12:11 ` Fengguang Wu
2007-07-20 16:02 ` Linus Torvalds
[not found] ` <1184927207.20032.168.camel@twins>
2007-07-20 10:48 ` Peter Zijlstra
[not found] ` <20070720112409.GB6300@mail.ustc.edu.cn>
2007-07-20 11:24 ` Fengguang Wu
[not found] ` <20070720101124.083676724@mail.ustc.edu.cn>
2007-07-20 10:07 ` [PATCH 2/6] mmap read-around simplification Fengguang Wu
[not found] ` <20070720101124.221472134@mail.ustc.edu.cn>
2007-07-20 10:07 ` [PATCH 3/6] remove several readahead macros Fengguang Wu
[not found] ` <20070720101124.470940735@mail.ustc.edu.cn>
2007-07-20 10:07 ` [PATCH 5/6] introduce radix_tree_scan_hole() Fengguang Wu
[not found] ` <20070720101124.600141268@mail.ustc.edu.cn>
2007-07-20 10:07 ` [PATCH 6/6] basic support of interleaved reads Fengguang Wu
[not found] ` <20070720101124.350754890@mail.ustc.edu.cn>
2007-07-20 10:07 ` Fengguang Wu [this message]
2007-07-20 11:07 ` [PATCH 4/6] remove the limit max_sectors_kb imposed on max_readahead_kb Jens Axboe
[not found] ` <20070720112528.GC6300@mail.ustc.edu.cn>
2007-07-20 11:25 ` Fengguang Wu
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