The patch titled
mm: introduce PG_readahead
has been added to the -mm tree. Its filename is
mm-introduce-pg_readahead.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: mm: introduce PG_readahead
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Introduce a new page flag: PG_readahead.
It acts as a look-ahead mark, which tells the page reader:
Hey, it's time to invoke the adaptive read-ahead logic!
For the sake of I/O pipelining, don't wait until it runs out of
cached pages. ;-)
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/page-flags.h | 6 ++++++
mm/page_alloc.c | 2 +-
2 files changed, 7 insertions(+), 1 deletion(-)
diff -puN include/linux/page-flags.h~mm-introduce-pg_readahead include/linux/page-flags.h
--- a/include/linux/page-flags.h~mm-introduce-pg_readahead
+++ a/include/linux/page-flags.h
@@ -91,6 +91,8 @@
#define PG_nosave_free 18 /* Used for system suspend/resume */
#define PG_buddy 19 /* Page is free, on buddy lists */
+#define PG_readahead 20 /* Reminder to do read-ahead */
+
#if (BITS_PER_LONG > 32)
/*
@@ -251,6 +253,10 @@ static inline void SetPageUptodate(struc
#define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags)
#define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)
+#define PageReadahead(page) test_bit(PG_readahead, &(page)->flags)
+#define SetPageReadahead(page) set_bit(PG_readahead, &(page)->flags)
+#define ClearPageReadahead(page) clear_bit(PG_readahead, &(page)->flags)
+
struct page; /* forward declaration */
int test_clear_page_dirty(struct page *page);
diff -puN mm/page_alloc.c~mm-introduce-pg_readahead mm/page_alloc.c
--- a/mm/page_alloc.c~mm-introduce-pg_readahead
+++ a/mm/page_alloc.c
@@ -598,7 +598,7 @@ static int prep_new_page(struct page *pa
if (PageReserved(page))
return 1;
- page->flags &= ~(1 << PG_uptodate | 1 << PG_error |
+ page->flags &= ~(1 << PG_uptodate | 1 << PG_error | 1 << PG_readahead |
1 << PG_referenced | 1 << PG_arch_1 |
1 << PG_checked | 1 << PG_mappedtodisk);
set_page_private(page, 0);
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-kconfig-options.patch
radixtree-introduce-scan-hole-data-functions.patch
mm-introduce-probe_page.patch
mm-introduce-pg_readahead.patch
readahead-add-look-ahead-support-to-__do_page_cache_readahead.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-user-recommended-size.patch
readahead-initial-method.patch
readahead-backward-prefetching-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-remove-size-limit-on-read_ahead_kb.patch
readahead-remove-size-limit-of-max_sectors_kb-on-read_ahead_kb.patch
-
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