From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Wu Fengguang <fengguang.wu@intel.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Olivier Galibert <galibert@pobox.com>
Cc: Linux Memory Management List <linux-mm@kvack.org>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 04/11] readahead: introduce {MAX|MIN}_READAHEAD_PAGES macros for ease of use
Date: Sun, 07 Feb 2010 12:10:17 +0800 [thread overview]
Message-ID: <20100207041043.286260529@intel.com> (raw)
In-Reply-To: 20100207041013.891441102@intel.com
[-- Attachment #1: readahead-min-max-pages.patch --]
[-- Type: text/plain, Size: 2534 bytes --]
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
block/blk-core.c | 3 +--
fs/fuse/inode.c | 2 +-
include/linux/mm.h | 3 +++
mm/backing-dev.c | 2 +-
4 files changed, 6 insertions(+), 4 deletions(-)
--- linux.orig/block/blk-core.c 2010-01-30 17:38:48.000000000 +0800
+++ linux/block/blk-core.c 2010-01-30 18:10:01.000000000 +0800
@@ -498,8 +498,7 @@ struct request_queue *blk_alloc_queue_no
q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
q->backing_dev_info.unplug_io_data = q;
- q->backing_dev_info.ra_pages =
- (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
+ q->backing_dev_info.ra_pages = MAX_READAHEAD_PAGES;
q->backing_dev_info.state = 0;
q->backing_dev_info.capabilities = BDI_CAP_MAP_COPY;
q->backing_dev_info.name = "block";
--- linux.orig/fs/fuse/inode.c 2010-01-30 17:38:48.000000000 +0800
+++ linux/fs/fuse/inode.c 2010-01-30 18:10:01.000000000 +0800
@@ -870,7 +870,7 @@ static int fuse_bdi_init(struct fuse_con
int err;
fc->bdi.name = "fuse";
- fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
+ fc->bdi.ra_pages = MAX_READAHEAD_PAGES;
fc->bdi.unplug_io_fn = default_unplug_io_fn;
/* fuse does it's own writeback accounting */
fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
--- linux.orig/include/linux/mm.h 2010-01-30 18:09:58.000000000 +0800
+++ linux/include/linux/mm.h 2010-01-30 18:10:01.000000000 +0800
@@ -1187,6 +1187,9 @@ void task_dirty_inc(struct task_struct *
#define VM_MAX_READAHEAD 512 /* kbytes */
#define VM_MIN_READAHEAD 32 /* kbytes (includes current page) */
+#define MAX_READAHEAD_PAGES (VM_MAX_READAHEAD*1024 / PAGE_CACHE_SIZE)
+#define MIN_READAHEAD_PAGES DIV_ROUND_UP(VM_MIN_READAHEAD*1024, PAGE_CACHE_SIZE)
+
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
pgoff_t offset, unsigned long nr_to_read);
--- linux.orig/mm/backing-dev.c 2010-01-30 17:38:48.000000000 +0800
+++ linux/mm/backing-dev.c 2010-01-30 18:10:01.000000000 +0800
@@ -18,7 +18,7 @@ EXPORT_SYMBOL(default_unplug_io_fn);
struct backing_dev_info default_backing_dev_info = {
.name = "default",
- .ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
+ .ra_pages = MAX_READAHEAD_PAGES,
.state = 0,
.capabilities = BDI_CAP_MAP_COPY,
.unplug_io_fn = default_unplug_io_fn,
--
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next prev parent reply other threads:[~2010-02-07 4:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-07 4:10 [PATCH 00/11] 512K readahead size with thrashing safe readahead Wu Fengguang
2010-02-07 4:10 ` [PATCH 01/11] readahead: limit readahead size for small devices Wu Fengguang
2010-02-07 4:10 ` [PATCH 02/11] readahead: retain inactive lru pages to be accessed soon Wu Fengguang
2010-02-07 4:10 ` [PATCH 03/11] readahead: bump up the default readahead size Wu Fengguang
2010-02-08 7:20 ` Christian Ehrhardt
2010-02-08 13:46 ` Wu Fengguang
2010-02-11 21:37 ` Matt Mackall
2010-02-11 23:42 ` Jamie Lokier
2010-02-12 0:04 ` Matt Mackall
2010-02-12 13:59 ` Wu Fengguang
2010-02-12 20:20 ` Matt Mackall
2010-02-21 2:25 ` Wu Fengguang
2010-02-07 4:10 ` Wu Fengguang [this message]
2010-02-07 4:10 ` [PATCH 05/11] readahead: replace ra->mmap_miss with ra->ra_flags Wu Fengguang
2010-02-08 8:19 ` Nick Piggin
2010-02-08 13:43 ` Wu Fengguang
2010-02-07 4:10 ` [PATCH 06/11] readahead: thrashing safe context readahead Wu Fengguang
2010-02-07 4:10 ` [PATCH 07/11] readahead: record readahead patterns Wu Fengguang
2010-02-07 4:10 ` [PATCH 08/11] readahead: add tracing event Wu Fengguang
2010-02-07 4:10 ` [PATCH 09/11] readahead: add /debug/readahead/stats Wu Fengguang
2010-02-07 4:10 ` [PATCH 10/11] readahead: dont do start-of-file readahead after lseek() Wu Fengguang
2010-02-07 4:10 ` [PATCH 11/11] radixtree: speed up next/prev hole search Wu Fengguang
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