From 12706394bcaa48e3d5e19c97d7b4e5683ebb12fb Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sun, 10 Jul 2011 22:37:50 -0400 Subject: ext4: add tracepoint for ext4_journal_start This will help debug who is responsible for starting a jbd2 transaction. Signed-off-by: "Theodore Ts'o" --- fs/ext4/super.c | 1 + include/trace/events/ext4.h | 22 ++++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 9ea71aa864b..7910e61809e 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -269,6 +269,7 @@ handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) journal_t *journal; handle_t *handle; + trace_ext4_journal_start(sb, nblocks, _RET_IP_); if (sb->s_flags & MS_RDONLY) return ERR_PTR(-EROFS); diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h index 5ce2b2f5f52..6f27a59fc90 100644 --- a/include/trace/events/ext4.h +++ b/include/trace/events/ext4.h @@ -1520,6 +1520,28 @@ TRACE_EVENT(ext4_load_inode, (unsigned long) __entry->ino) ); +TRACE_EVENT(ext4_journal_start, + TP_PROTO(struct super_block *sb, int nblocks, unsigned long IP), + + TP_ARGS(sb, nblocks, IP), + + TP_STRUCT__entry( + __field( dev_t, dev ) + __field( int, nblocks ) + __field(unsigned long, ip ) + ), + + TP_fast_assign( + __entry->dev = sb->s_dev; + __entry->nblocks = nblocks; + __entry->ip = IP; + ), + + TP_printk("dev %d,%d nblocks %d caller %pF", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->nblocks, (void *)__entry->ip) +); + #endif /* _TRACE_EXT4_H */ /* This part must be outside protection */ -- cgit v1.2.3