f2fs: add tracepoint for f2fs_gc

This patch adds tracepoint for f2fs_gc.

Signed-off-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 e60480f..57bea21 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -919,7 +919,7 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
        struct blk_plug plug;
        unsigned int segno = start_segno;
        unsigned int end_segno = start_segno + sbi->segs_per_sec;
-       int sec_freed = 0;
+       int seg_freed = 0;
        unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
                                                SUM_TYPE_DATA : SUM_TYPE_NODE;
 
@@ -965,6 +965,10 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
                                                                gc_type);
 
                stat_inc_seg_count(sbi, type, gc_type);
+
+               if (gc_type == FG_GC &&
+                               get_valid_blocks(sbi, segno, false) == 0)
+                       seg_freed++;
 next:
                f2fs_put_page(sum_page, 0);
        }
@@ -975,21 +979,17 @@ next:
 
        blk_finish_plug(&plug);
 
-       if (gc_type == FG_GC &&
-               get_valid_blocks(sbi, start_segno, true) == 0)
-               sec_freed = 1;
-
        stat_inc_call_count(sbi->stat_info);
 
-       return sec_freed;
+       return seg_freed;
 }
 
 int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
                        bool background, unsigned int segno)
 {
        int gc_type = sync ? FG_GC : BG_GC;
-       int sec_freed = 0;
-       int ret;
+       int sec_freed = 0, seg_freed = 0, total_freed = 0;
+       int ret = 0;
        struct cp_control cpc;
        unsigned int init_segno = segno;
        struct gc_inode_list gc_list = {
@@ -997,6 +997,15 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
                .iroot = RADIX_TREE_INIT(GFP_NOFS),
        };
 
+       trace_f2fs_gc_begin(sbi->sb, sync, background,
+                               get_pages(sbi, F2FS_DIRTY_NODES),
+                               get_pages(sbi, F2FS_DIRTY_DENTS),
+                               get_pages(sbi, F2FS_DIRTY_IMETA),
+                               free_sections(sbi),
+                               free_segments(sbi),
+                               reserved_segments(sbi),
+                               prefree_segments(sbi));
+
        cpc.reason = __get_cp_reason(sbi);
 gc_more:
        if (unlikely(!(sbi->sb->s_flags & MS_ACTIVE))) {
@@ -1023,17 +1032,20 @@ gc_more:
                        gc_type = FG_GC;
        }
 
-       ret = -EINVAL;
        /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
-       if (gc_type == BG_GC && !background)
+       if (gc_type == BG_GC && !background) {
+               ret = -EINVAL;
                goto stop;
-       if (!__get_victim(sbi, &segno, gc_type))
+       }
+       if (!__get_victim(sbi, &segno, gc_type)) {
+               ret = -ENODATA;
                goto stop;
-       ret = 0;
+       }
 
-       if (do_garbage_collect(sbi, segno, &gc_list, gc_type) &&
-                       gc_type == FG_GC)
+       seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type);
+       if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec)
                sec_freed++;
+       total_freed += seg_freed;
 
        if (gc_type == FG_GC)
                sbi->cur_victim_sec = NULL_SEGNO;
@@ -1050,6 +1062,16 @@ gc_more:
 stop:
        SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
        SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
+
+       trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
+                               get_pages(sbi, F2FS_DIRTY_NODES),
+                               get_pages(sbi, F2FS_DIRTY_DENTS),
+                               get_pages(sbi, F2FS_DIRTY_IMETA),
+                               free_sections(sbi),
+                               free_segments(sbi),
+                               reserved_segments(sbi),
+                               prefree_segments(sbi));
+
        mutex_unlock(&sbi->gc_mutex);
 
        put_gc_inode(&gc_list);

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index db5c982..8955e75 100644 (file)
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -569,6 +569,113 @@ TRACE_EVENT(f2fs_background_gc,
                __entry->free)
 );
 
+TRACE_EVENT(f2fs_gc_begin,
+
+       TP_PROTO(struct super_block *sb, bool sync, bool background,
+                       long long dirty_nodes, long long dirty_dents,
+                       long long dirty_imeta, unsigned int free_sec,
+                       unsigned int free_seg, int reserved_seg,
+                       unsigned int prefree_seg),
+
+       TP_ARGS(sb, sync, background, dirty_nodes, dirty_dents, dirty_imeta,
+               free_sec, free_seg, reserved_seg, prefree_seg),
+
+       TP_STRUCT__entry(
+               __field(dev_t,          dev)
+               __field(bool,           sync)
+               __field(bool,           background)
+               __field(long long,      dirty_nodes)
+               __field(long long,      dirty_dents)
+               __field(long long,      dirty_imeta)
+               __field(unsigned int,   free_sec)
+               __field(unsigned int,   free_seg)
+               __field(int,            reserved_seg)
+               __field(unsigned int,   prefree_seg)
+       ),
+
+       TP_fast_assign(
+               __entry->dev            = sb->s_dev;
+               __entry->sync           = sync;
+               __entry->background     = background;
+               __entry->dirty_nodes    = dirty_nodes;
+               __entry->dirty_dents    = dirty_dents;
+               __entry->dirty_imeta    = dirty_imeta;
+               __entry->free_sec       = free_sec;
+               __entry->free_seg       = free_seg;
+               __entry->reserved_seg   = reserved_seg;
+               __entry->prefree_seg    = prefree_seg;
+       ),
+
+       TP_printk("dev = (%d,%d), sync = %d, background = %d, nodes = %lld, "
+               "dents = %lld, imeta = %lld, free_sec:%u, free_seg:%u, "
+               "rsv_seg:%d, prefree_seg:%u",
+               show_dev(__entry->dev),
+               __entry->sync,
+               __entry->background,
+               __entry->dirty_nodes,
+               __entry->dirty_dents,
+               __entry->dirty_imeta,
+               __entry->free_sec,
+               __entry->free_seg,
+               __entry->reserved_seg,
+               __entry->prefree_seg)
+);
+
+TRACE_EVENT(f2fs_gc_end,
+
+       TP_PROTO(struct super_block *sb, int ret, int seg_freed,
+                       int sec_freed, long long dirty_nodes,
+                       long long dirty_dents, long long dirty_imeta,
+                       unsigned int free_sec, unsigned int free_seg,
+                       int reserved_seg, unsigned int prefree_seg),
+
+       TP_ARGS(sb, ret, seg_freed, sec_freed, dirty_nodes, dirty_dents,
+               dirty_imeta, free_sec, free_seg, reserved_seg, prefree_seg),
+
+       TP_STRUCT__entry(
+               __field(dev_t,          dev)
+               __field(int,            ret)
+               __field(int,            seg_freed)
+               __field(int,            sec_freed)
+               __field(long long,      dirty_nodes)
+               __field(long long,      dirty_dents)
+               __field(long long,      dirty_imeta)
+               __field(unsigned int,   free_sec)
+               __field(unsigned int,   free_seg)
+               __field(int,            reserved_seg)
+               __field(unsigned int,   prefree_seg)
+       ),
+
+       TP_fast_assign(
+               __entry->dev            = sb->s_dev;
+               __entry->ret            = ret;
+               __entry->seg_freed      = seg_freed;
+               __entry->sec_freed      = sec_freed;
+               __entry->dirty_nodes    = dirty_nodes;
+               __entry->dirty_dents    = dirty_dents;
+               __entry->dirty_imeta    = dirty_imeta;
+               __entry->free_sec       = free_sec;
+               __entry->free_seg       = free_seg;
+               __entry->reserved_seg   = reserved_seg;
+               __entry->prefree_seg    = prefree_seg;
+       ),
+
+       TP_printk("dev = (%d,%d), ret = %d, seg_freed = %d, sec_freed = %d, "
+               "nodes = %lld, dents = %lld, imeta = %lld, free_sec:%u, "
+               "free_seg:%u, rsv_seg:%d, prefree_seg:%u",
+               show_dev(__entry->dev),
+               __entry->ret,
+               __entry->seg_freed,
+               __entry->sec_freed,
+               __entry->dirty_nodes,
+               __entry->dirty_dents,
+               __entry->dirty_imeta,
+               __entry->free_sec,
+               __entry->free_seg,
+               __entry->reserved_seg,
+               __entry->prefree_seg)
+);
+
 TRACE_EVENT(f2fs_get_victim,
 
        TP_PROTO(struct super_block *sb, int type, int gc_type,