The patch titled
readahead: initial method - user recommended size
has been added to the -mm tree. Its filename is
readahead-initial-method-user-recommended-size.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: readahead: initial method - user recommended size
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
backing_dev_info.ra_pages0 is a user configurable parameter that controls
the readahead size on start-of-file.
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
block/ll_rw_blk.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff -puN block/ll_rw_blk.c~readahead-initial-method-user-recommended-size block/ll_rw_blk.c
--- devel/block/ll_rw_blk.c~readahead-initial-method-user-recommended-size 2006-05-27 23:06:36.000000000 -0700
+++ devel-akpm/block/ll_rw_blk.c 2006-05-27 23:06:36.000000000 -0700
@@ -3764,6 +3764,29 @@ queue_ra_store(struct request_queue *q,
return ret;
}
+static ssize_t queue_initial_ra_show(struct request_queue *q, char *page)
+{
+ int kb = q->backing_dev_info.ra_pages0 << (PAGE_CACHE_SHIFT - 10);
+
+ return queue_var_show(kb, (page));
+}
+
+static ssize_t
+queue_initial_ra_store(struct request_queue *q, const char *page, size_t count)
+{
+ unsigned long kb, ra;
+ ssize_t ret = queue_var_store(&kb, page, count);
+
+ ra = kb >> (PAGE_CACHE_SHIFT - 10);
+ q->backing_dev_info.ra_pages0 = ra;
+
+ ra = kb * 1024;
+ if (q->backing_dev_info.ra_expect_bytes > ra)
+ q->backing_dev_info.ra_expect_bytes = ra;
+
+ return ret;
+}
+
static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
{
int max_sectors_kb = q->max_sectors >> 1;
@@ -3821,6 +3844,12 @@ static struct queue_sysfs_entry queue_ra
.store = queue_ra_store,
};
+static struct queue_sysfs_entry queue_initial_ra_entry = {
+ .attr = {.name = "initial_ra_kb", .mode = S_IRUGO | S_IWUSR },
+ .show = queue_initial_ra_show,
+ .store = queue_initial_ra_store,
+};
+
static struct queue_sysfs_entry queue_max_sectors_entry = {
.attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
.show = queue_max_sectors_show,
@@ -3841,6 +3870,7 @@ static struct queue_sysfs_entry queue_io
static struct attribute *default_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
+ &queue_initial_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
&queue_max_sectors_entry.attr,
&queue_iosched_entry.attr,
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-kconfig-options.patch
radixtree-introduce-radix_tree_scan_hole.patch
mm-introduce-probe_page.patch
mm-introduce-pg_readahead.patch
readahead-add-look-ahead-support-to-__do_page_cache_readahead.patch
readahead-delay-page-release-in-do_generic_mapping_read.patch
readahead-insert-cond_resched-calls.patch
readahead-minmax_ra_pages.patch
readahead-events-accounting.patch
readahead-rescue_pages.patch
readahead-sysctl-parameters.patch
readahead-min-max-sizes.patch
readahead-state-based-method-aging-accounting.patch
readahead-state-based-method-routines.patch
readahead-state-based-method.patch
readahead-context-based-method.patch
readahead-initial-method-guiding-sizes.patch
readahead-initial-method-thrashing-guard-size.patch
readahead-initial-method-expected-read-size.patch
readahead-initial-method-user-recommended-size.patch
readahead-initial-method.patch
readahead-backward-prefetching-method.patch
readahead-seeking-reads-method.patch
readahead-thrashing-recovery-method.patch
readahead-call-scheme.patch
readahead-laptop-mode.patch
readahead-loop-case.patch
readahead-nfsd-case.patch
readahead-turn-on-by-default.patch
readahead-debug-radix-tree-new-functions.patch
readahead-debug-traces-showing-accessed-file-names.patch
readahead-debug-traces-showing-read-patterns.patch
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