Hi, On Fri, 2010-02-05 at 16:45 +1100, Dave Chinner wrote: > Useful for tracking down where specific IOs are being issued > from. > > Signed-off-by: Dave Chinner <dchin...@redhat.com> > --- > fs/gfs2/log.c | 6 ++++++ > fs/gfs2/lops.c | 6 ++++++ > fs/gfs2/trace_gfs2.h | 41 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 53 insertions(+), 0 deletions(-) > > diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c > index 4511b08..bd26dff 100644 > --- a/fs/gfs2/log.c > +++ b/fs/gfs2/log.c > @@ -121,6 +121,7 @@ __acquires(&sdp->sd_log_lock) > lock_buffer(bh); > if (test_clear_buffer_dirty(bh)) { > bh->b_end_io = end_buffer_write_sync; > + trace_gfs2_submit_bh(bh, WRITE_SYNC_PLUG, > __func__); > submit_bh(WRITE_SYNC_PLUG, bh); This looks like it could be a generically useful function, I wonder if it would be possible to do this directly in submit_bh, since we should be able to use __builtin_return_address(0) to find out the origin of the call?
Steve.