ext4: Add new tracepoints to track mballoc's buddy bitmap loads

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 0bdc0188e5e28c99bd471a5ac7741c7938972fcc..a93f554b6803417a3c5238518c0d6a523e826689 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -890,6 +890,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
                        BUG_ON(incore == NULL);
                        mb_debug(1, "put buddy for group %u in page %lu/%x\n",
                                group, page->index, i * blocksize);
+                       trace_ext4_mb_buddy_bitmap_load(sb, group);
                        grinfo = ext4_get_group_info(sb, group);
                        grinfo->bb_fragments = 0;
                        memset(grinfo->bb_counters, 0,
@@ -907,6 +908,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
                        BUG_ON(incore != NULL);
                        mb_debug(1, "put bitmap for group %u in page %lu/%x\n",
                                group, page->index, i * blocksize);
+                       trace_ext4_mb_bitmap_load(sb, group);
 
                        /* see comments in ext4_mb_put_pa() */
                        ext4_lock_group(sb, group);

diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 2aa6aa3e8f613e038df5a595c4952ae721f14102..99fbf1d0a6b9e5e291820ea04058927b70455259 100644 (file)
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -974,6 +974,39 @@ TRACE_EVENT(ext4_da_release_space,
                  __entry->reserved_meta_blocks, __entry->allocated_meta_blocks)
 );
 
+DECLARE_EVENT_CLASS(ext4__bitmap_load,
+       TP_PROTO(struct super_block *sb, unsigned long group),
+
+       TP_ARGS(sb, group),
+
+       TP_STRUCT__entry(
+               __field(        dev_t,  dev                     )
+               __field(        __u32,  group                   )
+
+       ),
+
+       TP_fast_assign(
+               __entry->dev    = sb->s_dev;
+               __entry->group  = group;
+       ),
+
+       TP_printk("dev %s group %u",
+                 jbd2_dev_to_name(__entry->dev), __entry->group)
+);
+
+DEFINE_EVENT(ext4__bitmap_load, ext4_mb_bitmap_load,
+
+       TP_PROTO(struct super_block *sb, unsigned long group),
+
+       TP_ARGS(sb, group)
+);
+
+DEFINE_EVENT(ext4__bitmap_load, ext4_mb_buddy_bitmap_load,
+
+       TP_PROTO(struct super_block *sb, unsigned long group),
+
+       TP_ARGS(sb, group)
+);
 
 #endif /* _TRACE_EXT4_H */