From 95ed6c707f26a727a29972b60469630ae10d579c Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Thu, 13 Feb 2020 23:51:33 -0800 Subject: [PATCH] perf/cgroup: Order events in RB tree by cgroup id If one is monitoring 6 events on 20 cgroups the per-CPU RB tree will hold 120 events. The scheduling in of the events currently iterates over all events looking to see which events match the task's cgroup or its cgroup hierarchy. If a task is in 1 cgroup with 6 events, then 114 events are considered unnecessarily. This change orders events in the RB tree by cgroup id if it is present. This means scheduling in may go directly to events associated with the task's cgroup if one is present. The per-CPU iterator storage in visit_groups_merge is sized sufficent for an iterator per cgroup depth, where different iterators are needed for the task's cgroup and parent cgroups. By considering the set of iterators when visiting, the lowest group_index event may be selected and the insertion order group_index property is maintained. This also allows event rotation to function correctly, as although events are grouped into a cgroup, rotation always selects the lowest group_index event to rotate (delete/insert into the tree) and the min heap of iterators make it so that the group_index order is maintained. Signed-off-by: Ian Rogers Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lkml.kernel.org/r/20190724223746.153620-3-irogers@google.com --- kernel/events/core.c | 98 ++++++++++++++++++++++++++++++++++++++------ 1 file changed, 86 insertions(+), 12 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 8065949a865e..ccf8d4fc6374 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1577,6 +1577,30 @@ perf_event_groups_less(struct perf_event *left, struct perf_event *right) if (left->cpu > right->cpu) return false; +#ifdef CONFIG_CGROUP_PERF + if (left->cgrp != right->cgrp) { + if (!left->cgrp || !left->cgrp->css.cgroup) { + /* + * Left has no cgroup but right does, no cgroups come + * first. + */ + return true; + } + if (!right->cgrp || right->cgrp->css.cgroup) { + /* + * Right has no cgroup but left does, no cgroups come + * first. + */ + return false; + } + /* Two dissimilar cgroups, order by id. */ + if (left->cgrp->css.cgroup->kn->id < right->cgrp->css.cgroup->kn->id) + return true; + + return false; + } +#endif + if (left->group_index < right->group_index) return true; if (left->group_index > right->group_index) @@ -1656,25 +1680,48 @@ del_event_from_groups(struct perf_event *event, struct perf_event_context *ctx) } /* - * Get the leftmost event in the @cpu subtree. + * Get the leftmost event in the cpu/cgroup subtree. */ static struct perf_event * -perf_event_groups_first(struct perf_event_groups *groups, int cpu) +perf_event_groups_first(struct perf_event_groups *groups, int cpu, + struct cgroup *cgrp) { struct perf_event *node_event = NULL, *match = NULL; struct rb_node *node = groups->tree.rb_node; +#ifdef CONFIG_CGROUP_PERF + u64 node_cgrp_id, cgrp_id = 0; + + if (cgrp) + cgrp_id = cgrp->kn->id; +#endif while (node) { node_event = container_of(node, struct perf_event, group_node); if (cpu < node_event->cpu) { node = node->rb_left; - } else if (cpu > node_event->cpu) { - node = node->rb_right; - } else { - match = node_event; - node = node->rb_left; + continue; } + if (cpu > node_event->cpu) { + node = node->rb_right; + continue; + } +#ifdef CONFIG_CGROUP_PERF + node_cgrp_id = 0; + if (node_event->cgrp && node_event->cgrp->css.cgroup) + node_cgrp_id = node_event->cgrp->css.cgroup->kn->id; + + if (cgrp_id < node_cgrp_id) { + node = node->rb_left; + continue; + } + if (cgrp_id > node_cgrp_id) { + node = node->rb_right; + continue; + } +#endif + match = node_event; + node = node->rb_left; } return match; @@ -1687,12 +1734,26 @@ static struct perf_event * perf_event_groups_next(struct perf_event *event) { struct perf_event *next; +#ifdef CONFIG_CGROUP_PERF + u64 curr_cgrp_id = 0; + u64 next_cgrp_id = 0; +#endif next = rb_entry_safe(rb_next(&event->group_node), typeof(*event), group_node); - if (next && next->cpu == event->cpu) - return next; + if (next == NULL || next->cpu != event->cpu) + return NULL; - return NULL; +#ifdef CONFIG_CGROUP_PERF + if (event->cgrp && event->cgrp->css.cgroup) + curr_cgrp_id = event->cgrp->css.cgroup->kn->id; + + if (next->cgrp && next->cgrp->css.cgroup) + next_cgrp_id = next->cgrp->css.cgroup->kn->id; + + if (curr_cgrp_id != next_cgrp_id) + return NULL; +#endif + return next; } /* @@ -3473,6 +3534,9 @@ static noinline int visit_groups_merge(struct perf_cpu_context *cpuctx, int (*func)(struct perf_event *, void *), void *data) { +#ifdef CONFIG_CGROUP_PERF + struct cgroup_subsys_state *css = NULL; +#endif /* Space for per CPU and/or any CPU event iterators. */ struct perf_event *itrs[2]; struct min_heap event_heap; @@ -3487,6 +3551,11 @@ static noinline int visit_groups_merge(struct perf_cpu_context *cpuctx, }; lockdep_assert_held(&cpuctx->ctx.lock); + +#ifdef CONFIG_CGROUP_PERF + if (cpuctx->cgrp) + css = &cpuctx->cgrp->css; +#endif } else { event_heap = (struct min_heap){ .data = itrs, @@ -3494,11 +3563,16 @@ static noinline int visit_groups_merge(struct perf_cpu_context *cpuctx, .size = ARRAY_SIZE(itrs), }; /* Events not within a CPU context may be on any CPU. */ - __heap_add(&event_heap, perf_event_groups_first(groups, -1)); + __heap_add(&event_heap, perf_event_groups_first(groups, -1, NULL)); } evt = event_heap.data; - __heap_add(&event_heap, perf_event_groups_first(groups, cpu)); + __heap_add(&event_heap, perf_event_groups_first(groups, cpu, NULL)); + +#ifdef CONFIG_CGROUP_PERF + for (; css; css = css->parent) + __heap_add(&event_heap, perf_event_groups_first(groups, cpu, css->cgroup)); +#endif min_heapify_all(&event_heap, &perf_min_heap);