diff options
| author | Bob Liu <lliubbo@gmail.com> | 2010-07-10 18:05:33 +0800 |
|---|---|---|
| committer | Pekka Enberg <penberg@cs.helsinki.fi> | 2010-07-16 11:03:20 +0300 |
| commit | d602dabaeba79df90cc67c32d5fe4ee0d5e2b73a (patch) | |
| tree | 7aa3b395f4c2934adde7b07a6678c347c84a7d35 | |
| parent | 1c5474a65bf15a4cb162dfff86d6d0b5a08a740c (diff) | |
SLOB: Free objects to their own list
SLOB has alloced smaller objects from their own list in reduce overall external
fragmentation and increase repeatability, free to their own list also.
This is /proc/meminfo result in my test machine:
without this patch:
===
MemTotal: 1030720 kB
MemFree: 750012 kB
Buffers: 15496 kB
Cached: 160396 kB
SwapCached: 0 kB
Active: 105024 kB
Inactive: 145604 kB
Active(anon): 74816 kB
Inactive(anon): 2180 kB
Active(file): 30208 kB
Inactive(file): 143424 kB
Unevictable: 16 kB
....
with this patch:
===
MemTotal: 1030720 kB
MemFree: 751908 kB
Buffers: 15492 kB
Cached: 160280 kB
SwapCached: 0 kB
Active: 102720 kB
Inactive: 146140 kB
Active(anon): 73168 kB
Inactive(anon): 2180 kB
Active(file): 29552 kB
Inactive(file): 143960 kB
Unevictable: 16 kB
...
The result shows an improvement of 1 MB!
And when I tested it on a embeded system with 64 MB, I found this path is never
called during kernel bootup.
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
| -rw-r--r-- | mm/slob.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/slob.c b/mm/slob.c index 23631e2bb57a..6a208f81888a 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -394,6 +394,7 @@ static void slob_free(void *block, int size) slob_t *prev, *next, *b = (slob_t *)block; slobidx_t units; unsigned long flags; + struct list_head *slob_list; if (unlikely(ZERO_OR_NULL_PTR(block))) return; @@ -422,7 +423,13 @@ static void slob_free(void *block, int size) set_slob(b, units, (void *)((unsigned long)(b + SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK)); - set_slob_page_free(sp, &free_slob_small); + if (size < SLOB_BREAK1) + slob_list = &free_slob_small; + else if (size < SLOB_BREAK2) + slob_list = &free_slob_medium; + else + slob_list = &free_slob_large; + set_slob_page_free(sp, slob_list); goto out; } |