perf symbols: Prevent the use of kcore if the kernel has moved
authorAdrian Hunter <adrian.hunter@intel.com>
Wed, 29 Jan 2014 14:14:41 +0000 (16:14 +0200)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Fri, 31 Jan 2014 20:21:51 +0000 (17:21 -0300)
commita00d28cb72d3629c6481fe21ba6c6b4f96caed49
tree9e37aba781546006aafea081ee2cbcb3b9c2b893
parent0ae617bedde062003fd70e566e9a2601e273ea0e
perf symbols: Prevent the use of kcore if the kernel has moved

Use of kcore is predicated upon it matching the recorded data.  If the
kernel has been relocated at boot time (i.e. since the data was
recorded) then do not use kcore.

Note that it is possible to make a copy of kcore at the time the data is
recorded using 'perf buildid-cache'.  Then the perf tools will use the
copy because it does match the data.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1391004884-10334-7-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/util/symbol.c