[PATCH v2 0/6] Thread memory improvements and fixes

Ian Rogers
2024-02-27T22:02:02Z

The next 6 patches from:
https://lore.kernel.org/lkml/20240202061532.1939474-1-irogers@google.com/
now the initial maps fixes have landed:
https://lore.kernel.org/all/20240210031746.4057262-1-irogers@google.com/

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 threads 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.

v2: improve comments and a commit message.

Ian Rogers (6):
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

tools/perf/builtin-report.c | 217 +++++++++-------
tools/perf/builtin-trace.c | 41 +--
tools/perf/util/Build | 1 +
tools/perf/util/bpf_lock_contention.c | 8 +-
tools/perf/util/machine.c | 344 +++++++-------------------
tools/perf/util/machine.h | 30 +--
tools/perf/util/rb_resort.h | 5 -
tools/perf/util/thread.c | 2 +-
tools/perf/util/thread.h | 6 -
tools/perf/util/threads.c | 186 ++++++++++++++
tools/perf/util/threads.h | 35 +++
11 files changed, 477 insertions(+), 398 deletions(-)
create mode 100644 tools/perf/util/threads.c
create mode 100644 tools/perf/util/threads.h

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2.44.0.rc1.240.g4c46232300-goog