perf tools: Fix ommitted mmap data update on remap
authorFrederic Weisbecker <fweisbec@gmail.com>
Mon, 23 May 2011 11:06:28 +0000 (13:06 +0200)
committerIngo Molnar <mingo@elte.hu>
Mon, 23 May 2011 11:22:57 +0000 (13:22 +0200)
commit998bedc8c56c6869de457c845cbd328592e5e82e
treec269208d64edc1a535382601a8904e0eb96a1fcc
parent4eec42f392043063d0f019640b4ccc2a45570002
perf tools: Fix ommitted mmap data update on remap

Commit eac9eacee16 "perf tools: Check we are able to read the event
size on mmap" brought a check to ensure we can read the size of the
event before dereferencing it, and do a remap otherwise to move the
buffer forward.

However that remap was ommitting all the necessary work to
update the new page offset, head, and to unmap previous pages,
etc...

To fix this, gather all the code that fetches the event in a
seperate helper which does all the necessary checks about the
header/event size and tells us anytime a remap is needed.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1306148788-6179-3-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
tools/perf/util/session.c