f2fs: avoid frequent checkpoint during f2fs_gc

Now we're doing SSR aggressively more than ever before, so once we reach to
the reserved_segment, f2fs_balance_fs will call f2fs_gc, which triggers
checkpoint everytime. We actually must avoid that.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index e2f9b2b12b743292d7caca6e33a53d25b94e40f8..9172112d624642a3a04aea669596db81ffc9827b 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -966,9 +966,11 @@ gc_more:
                 * threshold, we can make them free by checkpoint. Then, we
                 * secure free segments which doesn't need fggc any more.
                 */
-               ret = write_checkpoint(sbi, &cpc);
-               if (ret)
-                       goto stop;
+               if (prefree_segments(sbi)) {
+                       ret = write_checkpoint(sbi, &cpc);
+                       if (ret)
+                               goto stop;
+               }
                if (has_not_enough_free_secs(sbi, 0, 0))
                        gc_type = FG_GC;
        }