The patch titled
readahead: common macros
has been added to the -mm tree. Its filename is
readahead-common-macros.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: common macros
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Define some common used macros for the read-ahead logics.
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/readahead.c | 14 ++++++++++++--
1 files changed, 12 insertions(+), 2 deletions(-)
diff -puN mm/readahead.c~readahead-common-macros mm/readahead.c
--- 25/mm/readahead.c~readahead-common-macros Wed May 24 16:49:11 2006
+++ 25-akpm/mm/readahead.c Wed May 24 16:49:11 2006
@@ -5,6 +5,8 @@
*
* 09Apr2002 akpm@xxxxxxxxxx
* Initial version.
+ * 21May2006 Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
+ * Adaptive read-ahead framework.
*/
#include <linux/kernel.h>
@@ -14,6 +16,14 @@
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
+#include <linux/writeback.h>
+#include <linux/nfsd/const.h>
+
+#define PAGES_BYTE(size) (((size) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)
+#define PAGES_KB(size) PAGES_BYTE((size)*1024)
+
+#define next_page(pg) (list_entry((pg)->lru.prev, struct page, lru))
+#define prev_page(pg) (list_entry((pg)->lru.next, struct page, lru))
void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
{
@@ -21,7 +31,7 @@ void default_unplug_io_fn(struct backing
EXPORT_SYMBOL(default_unplug_io_fn);
struct backing_dev_info default_backing_dev_info = {
- .ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE,
+ .ra_pages = PAGES_KB(VM_MAX_READAHEAD),
.state = 0,
.capabilities = BDI_CAP_MAP_COPY,
.unplug_io_fn = default_unplug_io_fn,
@@ -50,7 +60,7 @@ static inline unsigned long get_max_read
static inline unsigned long get_min_readahead(struct file_ra_state *ra)
{
- return (VM_MIN_READAHEAD * 1024) / PAGE_CACHE_SIZE;
+ return PAGES_KB(VM_MIN_READAHEAD);
}
static inline void reset_ahead_window(struct file_ra_state *ra)
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-kconfig-options.patch
radixtree-look-aside-cache.patch
radixtree-hole-scanning-functions.patch
readahead-page-flag-pg_readahead.patch
readahead-refactor-do_generic_mapping_read.patch
readahead-refactor-__do_page_cache_readahead.patch
readahead-insert-cond_resched-calls.patch
readahead-common-macros.patch
readahead-events-accounting.patch
readahead-support-functions.patch
readahead-sysctl-parameters.patch
readahead-min-max-sizes.patch
readahead-state-based-method-aging-accounting.patch
readahead-state-based-method-data-structure.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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