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5. perf-diff.txt

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.

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]