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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-06-05 16:31:21 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-06-06 12:52:08 -0300
commit8d628d26b997e6b2e93bf31cfc09e42cc496922e (patch)
treed3c0c537085d5ede32ed7f0487708e7bbe8b2ec4 /tools
parent9fb523363f6e3984457fee95bb7019395384ffa7 (diff)
perf annnotate: Make __symbol__inc_addr_samples handle src->histograms == NULL
Making it a bit more robust, this took place here when a sample appeared right after: ffffffff8a925000 D __nosave_end And before the next considered symbol, which, using kallsyms make us over guess the size of __nosave_end, and then the sequence: hist_entry__inc_addr_samples -> symbol__inc_addr_samples -> symbol__hists -> annotated_source__alloc_histograms Ends up not liking to allocate gigabytes of ram for annotation... This will be alleviated by considering BSS symbols, which we should but don't so far, and then we should investigate those samples further. The testcase was to have: perf top -e cycles/call-graph=fp/,cache-misses/call-graph=dwarf/,instructions Running for a while till it segfaulted trying to access NULL notes->src->histograms. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-ndfjtpiop3tdcnyjgp320ra8@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/annotate.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 2baa22933b0e..f91775b4bc3c 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -819,6 +819,11 @@ static int __symbol__inc_addr_samples(struct symbol *sym, struct map *map,
offset = addr - sym->start;
h = annotated_source__histogram(src, evidx);
+ if (h == NULL) {
+ pr_debug("%s(%d): ENOMEM! sym->name=%s, start=%#" PRIx64 ", addr=%#" PRIx64 ", end=%#" PRIx64 ", func: %d\n",
+ __func__, __LINE__, sym->name, sym->start, addr, sym->end, sym->type == STT_FUNC);
+ return -ENOMEM;
+ }
h->nr_samples++;
h->addr[offset].nr_samples++;
h->period += sample->period;