Messages in this thread | | | From | "Wangnan (F)" <> | Subject | [BUG] perf: memory leak in perf top | Date | Fri, 5 Aug 2016 18:58:12 +0800 |
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perf top comsumes too much memory than it need.
Using following commands:
# yes '' > /dev/null # perf top -e raw_syscalls:sys_enter
System will quickly become unresponsive because of out of memory.
Using GDB I find two call stacks of malloc. See below.
[call stack 1]
#0 __GI___libc_malloc (bytes=140723951319552) at malloc.c:2841 #1 0x00000000004b7246 in memdup (src=0x7f515e04b054, len=68) at ../lib/string.c:29 #2 0x00000000004f9299 in hist_entry__init (sample_self=true, template=0x7ffcd9213a80, he=0xa37da50) at util/hist.c:401 #3 hist_entry__new (template=template@entry=0x7ffcd9213a80 <mailto:%28template=template@entry=0x7ffcd9213a80>, sample_self=sample_self@entry=true) <mailto:sample_self=sample_self@entry=true%29> at util/hist.c:458 #4 0x00000000004fa13f in hists__findnew_entry (hists=0x3549d30, hists=0x3549d30, al=0x7ffcd9213ca0, sample_self=true, entry=0x 7ffcd9213a80) at util/hist.c:544 #5 __hists__add_entry (hists=0x3549d30, al=0x7ffcd9213ca0, sym_parent=<optimized out>, bi=bi@entry=0x0 <mailto:bi=bi@entry=0x0>, mi=mi@entry=0x0 <mailto:mi=mi@entry=0x0>, sampl e=<optimized out>, sample_self=sample_self@entry=true <mailto:sample_self=sample_self@entry=true>, ops=ops@entry=0x0) <mailto:ops=ops@entry=0x0%29> at util/hist.c:600 #6 0x00000000004fa3d6 in hists__add_entry (sample_self=true, sample=<optimized out>, mi=0x0, bi=0x0, sym_parent=<optimized out >, al=<optimized out>, hists=<optimized out>) at util/hist.c:611 #7 iter_add_single_normal_entry (iter=0x7ffcd9213ce0, al=<optimized out>) at util/hist.c:823 #8 0x00000000004fc3c5 in hist_entry_iter__add (iter=0x7ffcd9213ce0, al=0x7ffcd9213ca0, max_stack_depth=<optimized out>, arg=0x 7ffcd9214120) at util/hist.c:1030 #9 0x00000000004536d7 in perf_event__process_sample (machine=<optimized out>, sample=0x7ffcd9213d30, evsel=0x3549bb0, event=<o ptimized out>, tool=0x7ffcd9214120) at builtin-top.c:800 #10 perf_top__mmap_read_idx (top=top@entry=0x7ffcd9214120 <mailto:%28top=top@entry=0x7ffcd9214120>, idx=idx@entry=0) <mailto:idx=idx@entry=0%29> at builtin-top.c:866 #11 0x00000000004559fd in perf_top__mmap_read (top=0x7ffcd9214120) at builtin-top.c:883 #12 __cmd_top (top=0x7ffcd9214120) at builtin-top.c:1018 #13 cmd_top (argc=<optimized out>, argv=<optimized out>, prefix=<optimized out>) at builtin-top.c:1344 #14 0x0000000000493561 in run_builtin (p=p@entry=0x948000 <mailto:%28p=p@entry=0x948000> <commands+288>, argc=argc@entry=4 <mailto:argc=argc@entry=4>, argv=argv@entry=0x7ffcd92199b0) <mailto:argv=argv@entry=0x7ffcd92199b0%29> at perf.c:357 #15 0x0000000000437157 in handle_internal_command (argv=0x7ffcd92199b0, argc=4) at perf.c:419 #16 run_argv (argv=0x7ffcd9219720, argcp=0x7ffcd921972c) at perf.c:465 #17 main (argc=4, argv=0x7ffcd92199b0) at perf.c:609
[call stack 2]
#0 __GI___libc_malloc (bytes=140723951319456) at malloc.c:2841 #1 0x00000000005766de in trace_seq_init (s=0x7ffcd92139b0) at trace-seq.c:60 #2 0x00000000004f7047 in get_trace_output (he=0x7ffcd9213a80) at util/sort.c:584 #3 sort__trace_cmp (left=0x40e6d30, right=0x7ffcd9213a80) at util/sort.c:606 #4 0x00000000004fa007 in hist_entry__cmp (right=0x7ffcd9213a80, left=0x40e6d30) at util/hist.c:1072 #5 hists__findnew_entry (hists=0x3549d30, hists=0x3549d30, al=0x7ffcd9213ca0, sample_self=true, entry=0x7ffcd9213a80) at util/ hist.c:509 #6 __hists__add_entry (hists=0x3549d30, al=0x7ffcd9213ca0, sym_parent=<optimized out>, bi=bi@entry=0x0 <mailto:bi=bi@entry=0x0>, mi=mi@entry=0x0 <mailto:mi=mi@entry=0x0>, sampl e=<optimized out>, sample_self=sample_self@entry=true <mailto:sample_self=sample_self@entry=true>, ops=ops@entry=0x0) <mailto:ops=ops@entry=0x0%29> at util/hist.c:600 #7 0x00000000004fa3d6 in hists__add_entry (sample_self=true, sample=<optimized out>, mi=0x0, bi=0x0, sym_parent=<optimized out >, al=<optimized out>, hists=<optimized out>) at util/hist.c:611 #8 iter_add_single_normal_entry (iter=0x7ffcd9213ce0, al=<optimized out>) at util/hist.c:823 #9 0x00000000004fc3c5 in hist_entry_iter__add (iter=0x7ffcd9213ce0, al=0x7ffcd9213ca0, max_stack_depth=<optimized out>, arg=0x 7ffcd9214120) at util/hist.c:1030 #10 0x00000000004536d7 in perf_event__process_sample (machine=<optimized out>, sample=0x7ffcd9213d30, evsel=0x3549bb0, event=<o ptimized out>, tool=0x7ffcd9214120) at builtin-top.c:800 #11 perf_top__mmap_read_idx (top=top@entry=0x7ffcd9214120 <mailto:%28top=top@entry=0x7ffcd9214120>, idx=idx@entry=0) <mailto:idx=idx@entry=0%29> at builtin-top.c:866 #12 0x00000000004559fd in perf_top__mmap_read (top=0x7ffcd9214120) at builtin-top.c:883 #13 __cmd_top (top=0x7ffcd9214120) at builtin-top.c:1018 #14 cmd_top (argc=<optimized out>, argv=<optimized out>, prefix=<optimized out>) at builtin-top.c:1344 #15 0x0000000000493561 in run_builtin (p=p@entry=0x948000 <mailto:%28p=p@entry=0x948000> <commands+288>, argc=argc@entry=4 <mailto:argc=argc@entry=4>, argv=argv@entry=0x7ffcd92199b0) <mailto:argv=argv@entry=0x7ffcd92199b0%29> at perf.c:357 #16 0x0000000000437157 in handle_internal_command (argv=0x7ffcd92199b0, argc=4) at perf.c:419 #17 run_argv (argv=0x7ffcd9219720, argcp=0x7ffcd921972c) at perf.c:465 #18 main (argc=4, argv=0x7ffcd92199b0) at perf.c:609
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