[PATCH] f2fs: do gc in greedy mode for whole range if gc_urgent mode is set

[Jaegeuk Kim]

Otherwise, f2fs conducts GC on 8GB range only based on slow cost-benefit.

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
 fs/f2fs/gc.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index bc9420ce2275..bfb7a4a3a929 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -162,12 +162,17 @@ static int select_gc_type(struct f2fs_gc_kthread *gc_th, 
int gc_type)
 {
        int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
 
-       if (gc_th && gc_th->gc_idle) {
+       if (!gc_th)
+               return gc_mode;
+
+       if (gc_th->gc_idle) {
                if (gc_th->gc_idle == 1)
                        gc_mode = GC_CB;
                else if (gc_th->gc_idle == 2)
                        gc_mode = GC_GREEDY;
        }
+       if (gc_th->gc_urgent)
+               gc_mode = GC_GREEDY;
        return gc_mode;
 }
 
@@ -189,7 +194,9 @@ static void select_policy(struct f2fs_sb_info *sbi, int 
gc_type,
        }
 
        /* we need to check every dirty segments in the FG_GC case */
-       if (gc_type != FG_GC && p->max_search > sbi->max_victim_search)
+       if (gc_type != FG_GC &&
+                       (sbi->gc_thread && !sbi->gc_thread->gc_urgent) &&
+                       p->max_search > sbi->max_victim_search)
                p->max_search = sbi->max_victim_search;
 
        /* let's select beginning hot/small space first in no_heap mode*/
-- 
2.15.0.531.g2ccb3012c9-goog