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Date: Thu,  1 Feb 2024 22:15:07 -0800
Message-Id: <20240202061532.1939474-1-irogers@google.com>
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Subject: [PATCH v8 00/25] maps/threads/dsos memory improvements and fixes
From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, 
	Arnaldo Carvalho de Melo <acme@kernel.org>, Mark Rutland <mark.rutland@arm.com>, 
	Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>, 
	Namhyung Kim <namhyung@kernel.org>, Ian Rogers <irogers@google.com>, 
	Adrian Hunter <adrian.hunter@intel.com>, Nick Terrell <terrelln@fb.com>, 
	Kan Liang <kan.liang@linux.intel.com>, Andi Kleen <ak@linux.intel.com>, 
	Kajol Jain <kjain@linux.ibm.com>, Athira Rajeev <atrajeev@linux.vnet.ibm.com>, 
	Huacai Chen <chenhuacai@kernel.org>, Masami Hiramatsu <mhiramat@kernel.org>, 
	"Steinar H. Gunderson" <sesse@google.com>, Liam Howlett <liam.howlett@oracle.com>, 
	Miguel Ojeda <ojeda@kernel.org>, Colin Ian King <colin.i.king@gmail.com>, 
	Dmitrii Dolgov <9erthalion6@gmail.com>, Yang Jihong <yangjihong1@huawei.com>, 
	Ming Wang <wangming01@loongson.cn>, James Clark <james.clark@arm.com>, 
	K Prateek Nayak <kprateek.nayak@amd.com>, Sean Christopherson <seanjc@google.com>, Leo Yan <leo.yan@linaro.org>, 
	Ravi Bangoria <ravi.bangoria@amd.com>, German Gomez <german.gomez@arm.com>, 
	Changbin Du <changbin.du@huawei.com>, Paolo Bonzini <pbonzini@redhat.com>, Li Dong <lidong@vivo.com>, 
	Sandipan Das <sandipan.das@amd.com>, linux-kernel@vger.kernel.org, 
	linux-perf-users@vger.kernel.org, Guilherme Amadio <amadio@gentoo.org>
Content-Type: text/plain; charset="UTF-8"

Modify the implementation of maps to not use an rbtree as the
container for maps, instead use a sorted array. Improve locking and
reference counting issues.

Similar to maps separate out and reimplement threads to use a hashmap
for lower memory consumption and faster look up. The fixes a
regression in memory usage where reference count checking switched to
using non-invasive tree nodes.  Reduce its default size by 32 times
and improve locking discipline. Also, fix regressions where tids had
become unordered to make `perf report --tasks` and
`perf trace --summary` output easier to read.

Better encapsulate the dsos abstraction. Remove the linked list and
rbtree used for faster iteration and log(n) lookup to a sorted array
for similar performance but half the memory usage per dso. Improve
reference counting and locking discipline, adding reference count
checking to dso.

v8:
 - in "perf maps: Switch from rbtree to lazily sorted array for
   addresses" use accessors and remove some duplicative invariant checks as
   requested by Namhyung.

v7:
 - rebase to latest perf-tools-next where 22 patches were applied by Arnaldo.
 - resolve merge conflicts, in particular with fc044c53b99f ("perf
   annotate-data: Add dso->data_types tree") that required more dso
   accessor functions.

v6 series is here:
https://lore.kernel.org/lkml/20231207011722.1220634-1-irogers@google.com/

Ian Rogers (25):
  perf maps: Switch from rbtree to lazily sorted array for addresses
  perf maps: Get map before returning in maps__find
  perf maps: Get map before returning in maps__find_by_name
  perf maps: Get map before returning in maps__find_next_entry
  perf maps: Hide maps internals
  perf maps: Locking tidy up of nr_maps
  perf dso: Reorder variables to save space in struct dso
  perf report: Sort child tasks by tid
  perf trace: Ignore thread hashing in summary
  perf machine: Move fprintf to for_each loop and a callback
  perf threads: Move threads to its own files
  perf threads: Switch from rbtree to hashmap
  perf threads: Reduce table size from 256 to 8
  perf dsos: Attempt to better abstract dsos internals
  perf dsos: Tidy reference counting and locking
  perf dsos: Add dsos__for_each_dso
  perf dso: Move dso functions out of dsos
  perf dsos: Switch more loops to dsos__for_each_dso
  perf dsos: Switch backing storage to array from rbtree/list
  perf dsos: Remove __dsos__addnew
  perf dsos: Remove __dsos__findnew_link_by_longname_id
  perf dsos: Switch hand code to bsearch
  perf dso: Add reference count checking and accessor functions
  perf dso: Reference counting related fixes
  perf dso: Use container_of to avoid a pointer in dso_data

 tools/perf/arch/x86/tests/dwarf-unwind.c      |    1 +
 tools/perf/builtin-annotate.c                 |    8 +-
 tools/perf/builtin-buildid-cache.c            |    2 +-
 tools/perf/builtin-buildid-list.c             |   18 +-
 tools/perf/builtin-inject.c                   |   96 +-
 tools/perf/builtin-kallsyms.c                 |    2 +-
 tools/perf/builtin-mem.c                      |    4 +-
 tools/perf/builtin-record.c                   |    2 +-
 tools/perf/builtin-report.c                   |  209 +--
 tools/perf/builtin-script.c                   |    8 +-
 tools/perf/builtin-top.c                      |    4 +-
 tools/perf/builtin-trace.c                    |   43 +-
 tools/perf/tests/code-reading.c               |    8 +-
 tools/perf/tests/dso-data.c                   |   67 +-
 tools/perf/tests/hists_common.c               |    6 +-
 tools/perf/tests/hists_cumulate.c             |    4 +-
 tools/perf/tests/hists_output.c               |    2 +-
 tools/perf/tests/maps.c                       |    7 +-
 tools/perf/tests/symbols.c                    |    2 +-
 tools/perf/tests/thread-maps-share.c          |    8 +-
 tools/perf/tests/vmlinux-kallsyms.c           |   16 +-
 tools/perf/ui/browsers/annotate.c             |    6 +-
 tools/perf/ui/browsers/hists.c                |    8 +-
 tools/perf/ui/browsers/map.c                  |    4 +-
 tools/perf/util/Build                         |    1 +
 tools/perf/util/annotate-data.c               |    6 +-
 tools/perf/util/annotate.c                    |   45 +-
 tools/perf/util/auxtrace.c                    |    2 +-
 tools/perf/util/block-info.c                  |    2 +-
 tools/perf/util/bpf-event.c                   |    9 +-
 tools/perf/util/bpf_lock_contention.c         |    8 +-
 tools/perf/util/build-id.c                    |  136 +-
 tools/perf/util/build-id.h                    |    2 -
 tools/perf/util/callchain.c                   |    4 +-
 tools/perf/util/data-convert-json.c           |    2 +-
 tools/perf/util/db-export.c                   |    6 +-
 tools/perf/util/dlfilter.c                    |   12 +-
 tools/perf/util/dso.c                         |  469 +++---
 tools/perf/util/dso.h                         |  549 ++++++-
 tools/perf/util/dsos.c                        |  529 ++++---
 tools/perf/util/dsos.h                        |   40 +-
 tools/perf/util/event.c                       |   12 +-
 tools/perf/util/header.c                      |    8 +-
 tools/perf/util/hist.c                        |    4 +-
 tools/perf/util/intel-pt.c                    |   22 +-
 tools/perf/util/machine.c                     |  570 +++-----
 tools/perf/util/machine.h                     |   32 +-
 tools/perf/util/map.c                         |   73 +-
 tools/perf/util/maps.c                        | 1298 +++++++++++------
 tools/perf/util/maps.h                        |   65 +-
 tools/perf/util/probe-event.c                 |   26 +-
 tools/perf/util/rb_resort.h                   |    5 -
 .../util/scripting-engines/trace-event-perl.c |    6 +-
 .../scripting-engines/trace-event-python.c    |   21 +-
 tools/perf/util/session.c                     |   21 +
 tools/perf/util/session.h                     |    2 +
 tools/perf/util/sort.c                        |   19 +-
 tools/perf/util/srcline.c                     |   65 +-
 tools/perf/util/symbol-elf.c                  |  132 +-
 tools/perf/util/symbol.c                      |  217 +--
 tools/perf/util/symbol_fprintf.c              |    4 +-
 tools/perf/util/synthetic-events.c            |   24 +-
 tools/perf/util/thread.c                      |    8 +-
 tools/perf/util/thread.h                      |    6 -
 tools/perf/util/threads.c                     |  186 +++
 tools/perf/util/threads.h                     |   35 +
 tools/perf/util/unwind-libunwind-local.c      |   20 +-
 tools/perf/util/unwind-libunwind.c            |    9 +-
 tools/perf/util/vdso.c                        |   56 +-
 69 files changed, 3143 insertions(+), 2160 deletions(-)
 create mode 100644 tools/perf/util/threads.c
 create mode 100644 tools/perf/util/threads.h

-- 
2.43.0.594.gd9cf4e227d-goog