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authorZhouyi Zhou <zhouzhouyi@gmail.com>2013-10-24 15:43:33 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-10-28 16:06:00 -0300
commit8e50d384cc1d5afd2989cf0f7093756ed7164eb2 (patch)
tree87e34b49783a32d8552eaad510d0b5fba94ee08e /tools/perf/builtin-kvm.c
parentae779a630977d93fbebfa06216ea47df5b5c62c8 (diff)
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>
Diffstat (limited to 'tools/perf/builtin-kvm.c')
-rw-r--r--tools/perf/builtin-kvm.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 935d52216c89..fbc2888d6495 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -888,11 +888,18 @@ static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) {
err = perf_evlist__parse_sample(kvm->evlist, event, &sample);
if (err) {
+ perf_evlist__mmap_consume(kvm->evlist, idx);
pr_err("Failed to parse sample\n");
return -1;
}
err = perf_session_queue_event(kvm->session, event, &sample, 0);
+ /*
+ * FIXME: Here we can't consume the event, as perf_session_queue_event will
+ * point to it, and it'll get possibly overwritten by the kernel.
+ */
+ perf_evlist__mmap_consume(kvm->evlist, idx);
+
if (err) {
pr_err("Failed to enqueue sample: %d\n", err);
return -1;