[PATCH 0/7] Optimize cgroup context switch

[Ian Rogers <irogers@google.com>]

Organize per-CPU perf event groups by cgroup then by group/insertion index.
To support cgroup hierarchies, a set of iterators is needed in
visit_groups_merge. To make this unbounded, use a per-CPU allocated
buffer. To make the set of iterators fast, use a min-heap ordered by
the group index.

These patches include a caching algorithm that avoids a search for the
first event in a group by Kan Liang <kan.liang@linux.intel.com> and the
set of patches as a whole have benefitted from conversation with him.

Ian Rogers (7):
  perf: propagate perf_install_in_context errors up
  perf/cgroup: order events in RB tree by cgroup id
  perf: order iterators for visit_groups_merge into a min-heap
  perf: avoid a bounded set of visit_groups_merge iterators
  perf: cache perf_event_groups_first for cgroups
  perf: avoid double checking CPU and cgroup
  perf: rename visit_groups_merge to ctx_groups_sched_in

 include/linux/perf_event.h |   8 +
 kernel/events/core.c       | 511 +++++++++++++++++++++++++++++--------
 2 files changed, 414 insertions(+), 105 deletions(-)

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2.22.0.410.gd8fdbe21b5-goog