f2fs: optimize the victim searching loop slightly

Since the MAX_VICTIM_SEARCH has been enlarged from 20 to 4096,
the victim searching overhead will be increased much than before,
especially for SSR that searches victim for use quiet often.
This patch intends to reduce the overhead a little bit by:
- make the get_gc_cost a inline routine to reduce function call
  overhead
- reduce multiplication and division operations
- reduce unnecessary comparison operation

Signed-off-by: Jin Xu <jinuxstyle@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 2f157e883687d5edb07f7cd53745d0ab6571cb6a..fbad96846c7cb6bb1f2fc799897c8f5f0d67a23a 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -236,8 +236,8 @@ static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
        return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
 }
 
-static unsigned int get_gc_cost(struct f2fs_sb_info *sbi, unsigned int segno,
-                                       struct victim_sel_policy *p)
+static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
+                       unsigned int segno, struct victim_sel_policy *p)
 {
        if (p->alloc_mode == SSR)
                return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
@@ -293,7 +293,11 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
                        }
                        break;
                }
-               p.offset = ((segno / p.ofs_unit) * p.ofs_unit) + p.ofs_unit;
+
+               p.offset = segno + p.ofs_unit;
+               if (p.ofs_unit > 1)
+                       p.offset -= segno % p.ofs_unit;
+
                secno = GET_SECNO(sbi, segno);
 
                if (sec_usage_check(sbi, secno))
@@ -306,10 +310,9 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
                if (p.min_cost > cost) {
                        p.min_segno = segno;
                        p.min_cost = cost;
-               }
-
-               if (cost == max_cost)
+               } else if (unlikely(cost == max_cost)) {
                        continue;
+               }
 
                if (nsearched++ >= p.max_search) {
                        sbi->last_victim[p.gc_mode] = segno;