From 8e50d384cc1d5afd2989cf0f7093756ed7164eb2 Mon Sep 17 00:00:00 2001 From: Zhouyi Zhou <zhouzhouyi@gmail.com> Date: Thu, 24 Oct 2013 15:43:33 +0800 Subject: perf tools: Fixup mmap event consumption The tail position of the event buffer should only be modified after actually use that event. If not the event buffer could be invalid before use, and segment fault occurs when invoking perf top -G. Signed-off-by: Zhouyi Zhou <yizhouzhou@ict.ac.cn> Cc: David Ahern <dsahern@gmail.com> Cc: Zhouyi Zhou <yizhouzhou@ict.ac.cn> Link: http://lkml.kernel.org/r/1382600613-32177-1-git-send-email-zhouzhouyi@gmail.com [ Simplified the logic using exit gotos and renamed write_tail method to mmap_consume ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/python.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tools/perf/util/python.c') diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c index 71b5412bbbb..2ac4bc92bb1 100644 --- a/tools/perf/util/python.c +++ b/tools/perf/util/python.c @@ -822,6 +822,8 @@ static PyObject *pyrf_evlist__read_on_cpu(struct pyrf_evlist *pevlist, PyObject *pyevent = pyrf_event__new(event); struct pyrf_event *pevent = (struct pyrf_event *)pyevent; + perf_evlist__mmap_consume(evlist, cpu); + if (pyevent == NULL) return PyErr_NoMemory(); -- cgit v1.2.3-70-g09d2