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readahead: remove several readahead macros 

Remove VM_MAX_CACHE_HIT, MAX_RA_PAGES and MIN_RA_PAGES.

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Fengguang Wu 2007-10-16 01:24:36 -07:00 committed by Linus Torvalds
parent 7ff81078d8
commit 535443f515
2 changed files with 1 additions and 11 deletions
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2
include/linux/mm.h
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@ -1106,8 +1106,6 @@ int write_one_page(struct page *page, int wait);
/* readahead.c */ /* readahead.c */
#define VM_MAX_READAHEAD 128 /* kbytes */ #define VM_MAX_READAHEAD 128 /* kbytes */
#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
#define VM_MAX_CACHE_HIT 256 /* max pages in a row in cache before
* turning readahead off */
int do_page_cache_readahead(struct address_space *mapping, struct file *filp, int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
pgoff_t offset, unsigned long nr_to_read); pgoff_t offset, unsigned long nr_to_read);

10
mm/readahead.c
View File

@ -22,16 +22,8 @@ void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
} }
EXPORT_SYMBOL(default_unplug_io_fn); EXPORT_SYMBOL(default_unplug_io_fn);
/*
* Convienent macros for min/max read-ahead pages.
* Note that MAX_RA_PAGES is rounded down, while MIN_RA_PAGES is rounded up.
* The latter is necessary for systems with large page size(i.e. 64k).
*/
#define MAX_RA_PAGES (VM_MAX_READAHEAD*1024 / PAGE_CACHE_SIZE)
#define MIN_RA_PAGES DIV_ROUND_UP(VM_MIN_READAHEAD*1024, PAGE_CACHE_SIZE)
struct backing_dev_info default_backing_dev_info = { struct backing_dev_info default_backing_dev_info = {
.ra_pages = MAX_RA_PAGES, .ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
.state = 0, .state = 0,
.capabilities = BDI_CAP_MAP_COPY, .capabilities = BDI_CAP_MAP_COPY,
.unplug_io_fn = default_unplug_io_fn, .unplug_io_fn = default_unplug_io_fn,