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f2fs: reorganise the function get_victim_by_default
Fix the function get_victim_by_default, where it checks for the condition that p.min_segno != NULL_SEGNO as shown: if (p.min_segno != NULL_SEGNO) goto got_it; and if above condition is true then got_it: if (p.min_segno != NULL_SEGNO) { So this condition is being checked twice. Hence move the goto statement after the if condition so that duplication of condition check is avoided. Also this function makes a call to get_max_cost() to compute the max cost based on the f2fs_sbi_info and victim policy. Since get_max_cost depends on on three parameters of victim_sel_policy => alloc_mode, gc_mode & ofs_unit, once this victim policy is initialised, these value will not change till the execution time of get_victim_by_default() & also f2fs_sbi_info structure parameters will not change. Hence making calls to get_max_cost() in while loop does not seems to be a good point. Instead we can call it once in begining and store the results in local variable, which later can serve our purpose for comparing the cost with max cost inside the while loop. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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1 changed files with 4 additions and 4 deletions
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@ -241,14 +241,14 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
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{
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struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
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struct victim_sel_policy p;
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unsigned int secno;
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unsigned int secno, max_cost;
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int nsearched = 0;
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p.alloc_mode = alloc_mode;
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select_policy(sbi, gc_type, type, &p);
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p.min_segno = NULL_SEGNO;
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p.min_cost = get_max_cost(sbi, &p);
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p.min_cost = max_cost = get_max_cost(sbi, &p);
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mutex_lock(&dirty_i->seglist_lock);
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@ -287,7 +287,7 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
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p.min_cost = cost;
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}
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if (cost == get_max_cost(sbi, &p))
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if (cost == max_cost)
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continue;
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if (nsearched++ >= MAX_VICTIM_SEARCH) {
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@ -295,8 +295,8 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
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break;
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}
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}
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got_it:
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if (p.min_segno != NULL_SEGNO) {
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got_it:
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if (p.alloc_mode == LFS) {
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secno = GET_SECNO(sbi, p.min_segno);
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if (gc_type == FG_GC)
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