perf-diff(1)
============

NAME
----
perf-diff - Read two perf.data files and display the differential profile

SYNOPSIS
--------
[verse]
'perf diff' [oldfile] [newfile]

DESCRIPTION
-----------
This command displays the performance difference amongst two perf.data files
captured via perf record.

If no parameters are passed it will assume perf.data.old and perf.data.

The differential profile is displayed only for events matching both
specified perf.data files.

OPTIONS
-------
-M::
--displacement::
        Show position displacement relative to baseline.

-D::
--dump-raw-trace::
        Dump raw trace in ASCII.

-m::
--modules::
        Load module symbols. WARNING: use only with -k and LIVE kernel

-d::
--dsos=::
	Only consider symbols in these dsos. CSV that understands
	file://filename entries.

-C::
--comms=::
	Only consider symbols in these comms. CSV that understands
	file://filename entries.

-S::
--symbols=::
	Only consider these symbols. CSV that understands
	file://filename entries.

-s::
--sort=::
	Sort by key(s): pid, comm, dso, symbol.

-t::
--field-separator=::

	Use a special separator character and don't pad with spaces, replacing
	all occurrences of this separator in symbol names (and other output)
	with a '.' character, that thus it's the only non valid separator.

-v::
--verbose::
	Be verbose, for instance, show the raw counts in addition to the
	diff.

-f::
--force::
       Don't complain, do it.

--symfs=<directory>::
        Look for files with symbols relative to this directory.

SEE ALSO
--------
linkperf:perf-record[1]