nilfs2: add tracepoints for analyzing reading and writing metadata files

This patch adds tracepoints for analyzing requests of reading and writing
metadata files.  The tracepoints cover every in-place mdt files (cpfile,
sufile, and datfile).

Example of tracing mdt_insert_new_block():
              cp-14635 [000] ...1 30598.199309: nilfs2_mdt_insert_new_block: inode = ffff88022a8d0178 ino = 3 block = 155
              cp-14635 [000] ...1 30598.199520: nilfs2_mdt_insert_new_block: inode = ffff88022a8d0178 ino = 3 block = 5
              cp-14635 [000] ...1 30598.200828: nilfs2_mdt_insert_new_block: inode = ffff88022a8d0178 ino = 3 block = 253

Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: TK Kato <TK.Kato@wdc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/include/trace/events/nilfs2.h b/include/trace/events/nilfs2.h
index 1b65ba687925..c7805818fcc6 100644
--- a/include/trace/events/nilfs2.h
+++ b/include/trace/events/nilfs2.h
@@ -162,6 +162,60 @@ TRACE_EVENT(nilfs2_segment_usage_freed,
                       __entry->segnum)
 );
 
+TRACE_EVENT(nilfs2_mdt_insert_new_block,
+            TP_PROTO(struct inode *inode,
+                     unsigned long ino,
+                     unsigned long block),
+
+            TP_ARGS(inode, ino, block),
+
+            TP_STRUCT__entry(
+                    __field(struct inode *, inode)
+                    __field(unsigned long, ino)
+                    __field(unsigned long, block)
+            ),
+
+            TP_fast_assign(
+                    __entry->inode = inode;
+                    __entry->ino = ino;
+                    __entry->block = block;
+                    ),
+
+            TP_printk("inode = %p ino = %lu block = %lu",
+                      __entry->inode,
+                      __entry->ino,
+                      __entry->block)
+);
+
+TRACE_EVENT(nilfs2_mdt_submit_block,
+            TP_PROTO(struct inode *inode,
+                     unsigned long ino,
+                     unsigned long blkoff,
+                     int mode),
+
+            TP_ARGS(inode, ino, blkoff, mode),
+
+            TP_STRUCT__entry(
+                    __field(struct inode *, inode)
+                    __field(unsigned long, ino)
+                    __field(unsigned long, blkoff)
+                    __field(int, mode)
+            ),
+
+            TP_fast_assign(
+                    __entry->inode = inode;
+                    __entry->ino = ino;
+                    __entry->blkoff = blkoff;
+                    __entry->mode = mode;
+                    ),
+
+            TP_printk("inode = %p ino = %lu blkoff = %lu mode = %x",
+                      __entry->inode,
+                      __entry->ino,
+                      __entry->blkoff,
+                      __entry->mode)
+);
+
 #endif /* _TRACE_NILFS2_H */
 
 /* This part must be outside protection */