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Commit 3ead342f authored by Park Ju Hyung's avatar Park Ju Hyung Committed by Razziell
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f2fs: don't trigger rapid GC repeatedly 



Wait until invalid blocks to reach 3% of utilization before triggering rapid GC
to avoid unnecessarily aggressive GC.

We use 3% from (total - written) to avoid GC not doing its job
when the storage gets nearly full.

Change-Id: I4e757d42ff44d5ed774dd70a38f9e78904d2c0ea
Signed-off-by: default avatarPark Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: default avatarAlbert I <krascgq@outlook.co.id>
parent af26999c

fs/f2fs/gc.c

+16 −3
Original line number Diff line number Diff line
@@ -209,16 +209,29 @@ void stop_gc_thread(struct f2fs_sb_info *sbi) 


static LIST_HEAD(f2fs_sbi_list);

static DEFINE_MUTEX(f2fs_sbi_mutex);

/* Trigger rapid GC when invalid block is higher than 3% */

#define RAPID_GC_LIMIT_INVALID_BLOCK 3



void start_all_gc_threads(void)

{

	struct f2fs_sb_info *sbi;

	block_t invalid_blocks;



	mutex_lock(&f2fs_sbi_mutex);

	list_for_each_entry(sbi, &f2fs_sbi_list, list) {

		invalid_blocks = sbi->user_block_count -

					written_block_count(sbi) -

					free_user_blocks(sbi);

		if (invalid_blocks >

		    ((long)((sbi->user_block_count - written_block_count(sbi)) *

			RAPID_GC_LIMIT_INVALID_BLOCK) / 100)) {

			start_gc_thread(sbi);

			sbi->gc_thread->gc_wake = 1;

			wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head);

		} else {

			pr_info("f2fs: invalid blocks lower than %d%%, skipping rapid GC (%u / (%u - %u))\n",

				RAPID_GC_LIMIT_INVALID_BLOCK, invalid_blocks, sbi->user_block_count, written_block_count(sbi));

		}

	}

	mutex_unlock(&f2fs_sbi_mutex);

}