linux-kernel - [PATCH v4 00/10] Optimize cgroup context switch

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Date:   Fri, 15 Nov 2019 17:18:35 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Petr Mladek <pmladek@...e.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Qian Cai <cai@....pw>, Joe Lawrence <joe.lawrence@...hat.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Gary Hook <Gary.Hook@....com>, Arnd Bergmann <arnd@...db.de>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v4 00/10] Optimize cgroup context switch

Avoid iterating over all per-CPU events during cgroup changing context
switches by organizing events by cgroup.

To make an efficient set of iterators, introduce a min max heap
utility with test.

The v4 patch set addresses review comments on the v3 patch set by
Peter Zijlstra.

These patches include a caching algorithm to improve the search for
the first event in a group by Kan Liang <kan.liang@...ux.intel.com> as
well as rebasing hit "optimize event_filter_match during sched_in"
from https://lkml.org/lkml/2019/8/7/771.

The v2 patch set was modified by Peter Zijlstra in his perf/cgroup
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git

These patches follow Peter's reorganization and his fixes to the
perf_cpu_context min_heap storage code.

Ian Rogers (8):
  lib: introduce generic min max heap
  perf: Use min_max_heap in visit_groups_merge
  perf: Add per perf_cpu_context min_heap storage
  perf/cgroup: Grow per perf_cpu_context heap storage
  perf/cgroup: Order events in RB tree by cgroup id
  perf: simplify and rename visit_groups_merge
  perf: cache perf_event_groups_first for cgroups
  perf: optimize event_filter_match during sched_in

Kan Liang (1):
  perf/cgroup: Do not switch system-wide events in cgroup switch

Peter Zijlstra (1):
  perf/cgroup: Reorder perf_cgroup_connect()

 include/linux/min_max_heap.h | 133 +++++++++
 include/linux/perf_event.h   |  15 +
 kernel/events/core.c         | 543 +++++++++++++++++++++++++++--------
 lib/Kconfig.debug            |  10 +
 lib/Makefile                 |   1 +
 lib/test_min_max_heap.c      | 194 +++++++++++++
 6 files changed, 782 insertions(+), 114 deletions(-)
 create mode 100644 include/linux/min_max_heap.h
 create mode 100644 lib/test_min_max_heap.c

-- 
2.24.0.432.g9d3f5f5b63-goog