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readahead: compacting file_ra_state

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Use 'unsigned int' instead of 'unsigned long' for readahead sizes.

This helps reduce memory consumption on 64bit CPU when a lot of files are
opened.

CC: Andi Kleen <andi@firstfloor.org>
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 01:24:31 -07:00 committed by Linus Torvalds
parent 43fac94dd6
commit 937085aa35
2 changed files with 5 additions and 5 deletions
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8
include/linux/fs.h
View File

@ -697,12 +697,12 @@ struct fown_struct {
* Track a single file's readahead state
*/
struct file_ra_state {
pgoff_t start; /* where readahead started */
unsigned long size; /* # of readahead pages */
unsigned long async_size; /* do asynchronous readahead when
pgoff_t start; /* where readahead started */
unsigned int size; /* # of readahead pages */
unsigned int async_size; /* do asynchronous readahead when
there are only # of pages ahead */
unsigned long ra_pages; /* Maximum readahead window */
unsigned int ra_pages; /* Maximum readahead window */
unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
unsigned long prev_index; /* Cache last read() position */

2
mm/readahead.c
View File

@ -351,7 +351,7 @@ ondemand_readahead(struct address_space *mapping,
bool hit_readahead_marker, pgoff_t offset,
unsigned long req_size)
{
unsigned long max; /* max readahead pages */
int max; /* max readahead pages */
int sequential;
max = ra->ra_pages;