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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-06-05 16:31:21 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-06-06 12:52:08 -0300 |
| commit | 8d628d26b997e6b2e93bf31cfc09e42cc496922e (patch) | |
| tree | d3c0c537085d5ede32ed7f0487708e7bbe8b2ec4 /tools | |
| parent | 9fb523363f6e3984457fee95bb7019395384ffa7 (diff) | |
| download | linux-8d628d26b997e6b2e93bf31cfc09e42cc496922e.tar.gz linux-8d628d26b997e6b2e93bf31cfc09e42cc496922e.tar.bz2 linux-8d628d26b997e6b2e93bf31cfc09e42cc496922e.zip | |
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.c | 5 |
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; |