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f2fs: avoid frequent background GC

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If there is no victim segments selected by background GC, let's wait
a little bit longer time to collect dirty segments.
By default, let's give 5 minutes.

Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-04-24 13:00:14 +09:00
parent 2af4bd6ca5
commit 6cb968d9b0
2 changed files with 9 additions and 6 deletions
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3
fs/f2fs/gc.c
View File

@ -82,9 +82,6 @@ static int gc_thread_func(void *data)
/* if return value is not zero, no victim was selected */
if (f2fs_gc(sbi))
wait_ms = GC_THREAD_NOGC_SLEEP_TIME;
else if (wait_ms == GC_THREAD_NOGC_SLEEP_TIME)
wait_ms = GC_THREAD_MAX_SLEEP_TIME;
} while (!kthread_should_stop());
return 0;
}

12
fs/f2fs/gc.h
View File

@ -13,9 +13,9 @@
* whether IO subsystem is idle
* or not
*/
#define GC_THREAD_MIN_SLEEP_TIME 10000 /* milliseconds */
#define GC_THREAD_MAX_SLEEP_TIME 30000
#define GC_THREAD_NOGC_SLEEP_TIME 10000
#define GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
#define GC_THREAD_MAX_SLEEP_TIME 60000
#define GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
@ -58,6 +58,9 @@ static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
static inline long increase_sleep_time(long wait)
{
if (wait == GC_THREAD_NOGC_SLEEP_TIME)
return wait;
wait += GC_THREAD_MIN_SLEEP_TIME;
if (wait > GC_THREAD_MAX_SLEEP_TIME)
wait = GC_THREAD_MAX_SLEEP_TIME;
@ -66,6 +69,9 @@ static inline long increase_sleep_time(long wait)
static inline long decrease_sleep_time(long wait)
{
if (wait == GC_THREAD_NOGC_SLEEP_TIME)
wait = GC_THREAD_MAX_SLEEP_TIME;
wait -= GC_THREAD_MIN_SLEEP_TIME;
if (wait <= GC_THREAD_MIN_SLEEP_TIME)
wait = GC_THREAD_MIN_SLEEP_TIME;