Wu Fengguang a écrit :
include/linux/fs.h | 8 +
--- linux-2.6.15-rc2-mm1.orig/include/linux/fs.h
+++ linux-2.6.15-rc2-mm1/include/linux/fs.h
@@ -604,13 +604,19 @@ struct file_ra_state {
unsigned long start; /* Current window */
unsigned long size;
unsigned long flags; /* ra flags RA_FLAG_xxx*/
- unsigned long cache_hit; /* cache hit count*/
+ uint64_t cache_hit; /* cache hit count*/
unsigned long prev_page; /* Cache last read() position */
unsigned long ahead_start; /* Ahead window */
unsigned long ahead_size;
unsigned long 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 age;
+ pgoff_t la_index;
+ pgoff_t ra_index;
+ pgoff_t lookahead_index;
+ pgoff_t readahead_index;
};
Hum... This sizeof(struct file) increase seems quite large...
Have you ever considered to change struct file so that file_ra_state is not
embedded, but dynamically allocated (or other strategy) for regular files ?
I mean, sockets, pipes cannot readahead... And some machines use far more
sockets than regular files.
I wrote such a patch in the past I could resend...
Eric
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