Commit b72e74d1 authored Apr 24, 2015 by Adrian Hunter Committed by Arnaldo Carvalho de Melo May 04, 2015

perf evlist: Amend mmap ref counting for the AUX area mmap



Reference counting of the mmap buffer does not work correctly when there
is an AUX area mmap also.

In snapshot mode it is not easy to know if the AUX area mmap buffer
contains usefull information. Equally the evlist does not know if the
recording is in sanpshot mode anyway.

Consequently, for now just assume the AUX area mmap always has data,
which will just cause the mmap buffer to remain mmapped for the duration
of the recording.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1429903807-20559-2-git-send-email-adrian.hunter@intel.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 7b6ff0bd

tools/perf/util/evlist.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -695,7 +695,7 @@ union perf_event perf_evlist__mmap_read(struct perf_evlist evlist, int idx)

		static bool perf_mmap__empty(struct perf_mmap *md)
		{
		return perf_mmap__read_head(md) == md->prev;
		return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base;
		}

		static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)

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