hi,
Andi reported that maps cloning is eating lot of memory and
it's probably unnecessary, because they keep the same data.
This 'maps sharing' seems to save lot of heap for reports with
many forks/cloned mmaps (over 60% in example below).
Profile kernel build:
$ perf record make -j 40
Get heap profile (tools/perf directory):
$ <install gperftools>
$ make TCMALLOC=1
$ HEAPPROFILE=/tmp/heapprof ./perf report -i perf.data --stdio > out
$ pprof ./perf /tmp/heapprof.000*
Before:
(pprof) top
Total: 2335.5 MB
1735.1 74.3% 74.3% 1735.1 74.3% memdup
402.0 17.2% 91.5% 402.0 17.2% zalloc
140.2 6.0% 97.5% 145.8 6.2% map__new
33.6 1.4% 98.9% 33.6 1.4% symbol__new
12.4 0.5% 99.5% 12.4 0.5% alloc_event
6.2 0.3% 99.7% 6.2 0.3% nsinfo__new
5.5 0.2% 100.0% 5.5 0.2% nsinfo__copy
0.3 0.0% 100.0% 0.3 0.0% dso__new
0.1 0.0% 100.0% 0.1 0.0% do_read_string
0.0 0.0% 100.0% 0.0 0.0% __GI__IO_file_doallocate
After:
(pprof) top
Total: 784.5 MB
385.8 49.2% 49.2% 385.8 49.2% memdup
285.8 36.4% 85.6% 285.8 36.4% zalloc
80.4 10.3% 95.9% 83.7 10.7% map__new
19.1 2.4% 98.3% 19.1 2.4% symbol__new
6.2 0.8% 99.1% 6.2 0.8% alloc_event
3.6 0.5% 99.6% 3.6 0.5% nsinfo__new
3.2 0.4% 100.0% 3.2 0.4% nsinfo__copy
0.2 0.0% 100.0% 0.2 0.0% dso__new
0.0 0.0% 100.0% 0.0 0.0% do_read_string
0.0 0.0% 100.0% 0.0 0.0% elf_fill
Also available in here:
git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
perf/map_shared
thanks,
jirka
---
Jiri Olsa (3):
perf tools: Allow to build with -ltcmalloc
perf tools: Separate shareable part of 'struct map' into 'struct
map_shared'
perf tools: Make 'struct map_shared' truly shared
tools/perf/Makefile.config | 5 +++
tools/perf/Makefile.perf | 2 +
tools/perf/arch/arm/tests/dwarf-unwind.c | 2 +-
tools/perf/arch/arm64/tests/dwarf-unwind.c | 2 +-
tools/perf/arch/powerpc/tests/dwarf-unwind.c | 2 +-
tools/perf/arch/powerpc/util/skip-callchain-idx.c | 4 +-
tools/perf/arch/powerpc/util/sym-handling.c | 4 +-
tools/perf/arch/s390/annotate/instructions.c | 2 +-
tools/perf/arch/x86/tests/dwarf-unwind.c | 2 +-
tools/perf/arch/x86/util/event.c | 6 +--
tools/perf/builtin-annotate.c | 8 ++--
tools/perf/builtin-inject.c | 10 +++--
tools/perf/builtin-kallsyms.c | 7 ++-
tools/perf/builtin-kmem.c | 2 +-
tools/perf/builtin-mem.c | 6 +--
tools/perf/builtin-report.c | 19 ++++----
tools/perf/builtin-script.c | 16 +++----
tools/perf/builtin-top.c | 15 ++++---
tools/perf/builtin-trace.c | 2 +-
tools/perf/tests/code-reading.c | 34 ++++++++-------
tools/perf/tests/hists_common.c | 4 +-
tools/perf/tests/hists_cumulate.c | 4 +-
tools/perf/tests/hists_filter.c | 4 +-
tools/perf/tests/hists_output.c | 2 +-
tools/perf/tests/map_groups.c | 22 +++++-----
tools/perf/tests/mmap-thread-lookup.c | 2 +-
tools/perf/tests/vmlinux-kallsyms.c | 36 ++++++++--------
tools/perf/ui/browsers/annotate.c | 4 +-
tools/perf/ui/browsers/hists.c | 10 ++---
tools/perf/ui/browsers/map.c | 4 +-
tools/perf/ui/gtk/annotate.c | 2 +-
tools/perf/util/annotate.c | 34 +++++++--------
tools/perf/util/auxtrace.c | 2 +-
tools/perf/util/bpf-event.c | 8 ++--
tools/perf/util/build-id.c | 2 +-
tools/perf/util/callchain.c | 6 +--
tools/perf/util/db-export.c | 4 +-
tools/perf/util/dso.c | 2 +-
tools/perf/util/event.c | 6 +--
tools/perf/util/evsel_fprintf.c | 2 +-
tools/perf/util/hist.c | 10 ++---
tools/perf/util/intel-pt.c | 42 ++++++++++--------
tools/perf/util/machine.c | 76
++++++++++++++++----------------
tools/perf/util/map.c | 226
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------------------
tools/perf/util/map.h | 32 ++++++++------
tools/perf/util/probe-event.c | 32 +++++++-------
tools/perf/util/scripting-engines/trace-event-perl.c | 8 ++--
tools/perf/util/scripting-engines/trace-event-python.c | 12 +++---
tools/perf/util/sort.c | 58
+++++++++++++------------
tools/perf/util/symbol-elf.c | 28 ++++++------
tools/perf/util/symbol.c | 80
+++++++++++++++++-----------------
tools/perf/util/symbol_fprintf.c | 2 +-
tools/perf/util/synthetic-events.c | 14 +++---
tools/perf/util/thread.c | 14 +++---
tools/perf/util/unwind-libdw.c | 16 ++++---
tools/perf/util/unwind-libunwind-local.c | 37 ++++++++--------
tools/perf/util/unwind-libunwind.c | 4 +-
tools/perf/util/vdso.c | 2 +-
58 files changed, 547 insertions(+), 456 deletions(-)
