tree 05c0188d5ecf806e4079181989f971efa3c44d47
parent 97ea1a7fa62af0d8d49a0fc12796b0073537c9d8
author Frederic Weisbecker <fweisbec@gmail.com> 1255032449 +0200
committer Ingo Molnar <mingo@elte.hu> 1255032662 +0200

perf tools: Provide backward compatibility with previous perf.data version

We have merged the trace.info file into perf.data by adding one
section in the perf headers. This makes it incompatible with
previous version: the new perf tools can't read the older
perf.data.

To support the previous format, we check the headers size. If they
have the same size than in the previous format, then ignore the
trace info section that doesn't exist.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1255032449-12022-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>