The patch titled
readahead: introduce PG_readahead
has been added to the -mm tree. Its filename is
readahead-introduce-pg_readahead.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: readahead: introduce PG_readahead
From: Fengguang Wu <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 read-ahead logic. For the sake of I/O pipelining, don't wait until
it runs out of cached pages!
Signed-off-by: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
Cc: Steven Pratt <slpratt@xxxxxxxxxxxxxx>
Cc: Ram Pai <linuxram@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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~readahead-introduce-pg_readahead include/linux/page-flags.h
--- a/include/linux/page-flags.h~readahead-introduce-pg_readahead
+++ a/include/linux/page-flags.h
@@ -92,6 +92,8 @@
#define PG_lazyfree 19 /* MADV_FREE potential throwaway */
#define PG_booked 20 /* Has blocks reserved on-disk */
+#define PG_readahead 21 /* Reminder to do async read-ahead */
+
/* PG_owner_priv_1 users should have descriptive aliases */
#define PG_checked PG_owner_priv_1 /* Used by some filesystems */
@@ -205,6 +207,10 @@ static inline void SetPageUptodate(struc
#define SetPageBooked(page) set_bit(PG_booked, &(page)->flags)
#define ClearPageBooked(page) clear_bit(PG_booked, &(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)
+
#define PageReclaim(page) test_bit(PG_reclaim, &(page)->flags)
#define SetPageReclaim(page) set_bit(PG_reclaim, &(page)->flags)
#define ClearPageReclaim(page) clear_bit(PG_reclaim, &(page)->flags)
diff -puN mm/page_alloc.c~readahead-introduce-pg_readahead mm/page_alloc.c
--- a/mm/page_alloc.c~readahead-introduce-pg_readahead
+++ a/mm/page_alloc.c
@@ -649,7 +649,7 @@ 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_owner_priv_1 | 1 << PG_mappedtodisk);
set_page_private(page, 0);
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-introduce-pg_readahead.patch
readahead-add-look-ahead-support-to-__do_page_cache_readahead.patch
readahead-min_ra_pages-max_ra_pages-macros.patch
readahead-data-structure-and-routines.patch
readahead-on-demand-readahead-logic.patch
readahead-convert-filemap-invocations.patch
readahead-convert-splice-invocations.patch
readahead-convert-ext3-ext4-invocations.patch
readahead-remove-the-old-algorithm.patch
-
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