Commit 6cb968d9 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: avoid frequent background GC 



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: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 2af4bd6c

fs/f2fs/gc.c

+0 −3
Original line number Diff line number Diff line
@@ -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;

}

fs/f2fs/gc.h

+9 −3
Original line number Diff line number Diff line
@@ -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;