From: Peter Zijlstra peterz@infradead.org
[ Upstream commit 33238c50451596be86db1505ab65fee5172844d0 ]
Song reports that installing cgroup events is broken since:
db0503e4f675 ("perf/core: Optimize perf_install_in_event()")
The problem being that cgroup events try to track cpuctx->cgrp even for disabled events, which is pointless and actively harmful since the above commit. Rework the code to have explicit enable/disable hooks for cgroup events, such that we can limit cgroup tracking to active events.
More specifically, since the above commit disabled events are no longer added to their context from the 'right' CPU, and we can't access things like the current cgroup for a remote CPU.
Cc: stable@vger.kernel.org # v5.5+ Fixes: db0503e4f675 ("perf/core: Optimize perf_install_in_event()") Reported-by: Song Liu songliubraving@fb.com Tested-by: Song Liu songliubraving@fb.com Reviewed-by: Song Liu songliubraving@fb.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Ingo Molnar mingo@kernel.org Link: https://lkml.kernel.org/r/20200318193337.GB20760@hirez.programming.kicks-ass... Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/events/core.c | 70 +++++++++++++++++++++++++++----------------- 1 file changed, 43 insertions(+), 27 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index 95860901949e7..b816127367ffc 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -935,16 +935,10 @@ perf_cgroup_set_shadow_time(struct perf_event *event, u64 now) event->shadow_ctx_time = now - t->timestamp; }
-/* - * Update cpuctx->cgrp so that it is set when first cgroup event is added and - * cleared when last cgroup event is removed. - */ static inline void -list_update_cgroup_event(struct perf_event *event, - struct perf_event_context *ctx, bool add) +perf_cgroup_event_enable(struct perf_event *event, struct perf_event_context *ctx) { struct perf_cpu_context *cpuctx; - struct list_head *cpuctx_entry;
if (!is_cgroup_event(event)) return; @@ -961,28 +955,41 @@ list_update_cgroup_event(struct perf_event *event, * because if the first would mismatch, the second would not try again * and we would leave cpuctx->cgrp unset. */ - if (add && !cpuctx->cgrp) { + if (ctx->is_active && !cpuctx->cgrp) { struct perf_cgroup *cgrp = perf_cgroup_from_task(current, ctx);
if (cgroup_is_descendant(cgrp->css.cgroup, event->cgrp->css.cgroup)) cpuctx->cgrp = cgrp; }
- if (add && ctx->nr_cgroups++) + if (ctx->nr_cgroups++) return; - else if (!add && --ctx->nr_cgroups) + + list_add(&cpuctx->cgrp_cpuctx_entry, + per_cpu_ptr(&cgrp_cpuctx_list, event->cpu)); +} + +static inline void +perf_cgroup_event_disable(struct perf_event *event, struct perf_event_context *ctx) +{ + struct perf_cpu_context *cpuctx; + + if (!is_cgroup_event(event)) return;
- /* no cgroup running */ - if (!add) + /* + * Because cgroup events are always per-cpu events, + * @ctx == &cpuctx->ctx. + */ + cpuctx = container_of(ctx, struct perf_cpu_context, ctx); + + if (--ctx->nr_cgroups) + return; + + if (ctx->is_active && cpuctx->cgrp) cpuctx->cgrp = NULL;
- cpuctx_entry = &cpuctx->cgrp_cpuctx_entry; - if (add) - list_add(cpuctx_entry, - per_cpu_ptr(&cgrp_cpuctx_list, event->cpu)); - else - list_del(cpuctx_entry); + list_del(&cpuctx->cgrp_cpuctx_entry); }
#else /* !CONFIG_CGROUP_PERF */ @@ -1048,11 +1055,14 @@ static inline u64 perf_cgroup_event_time(struct perf_event *event) }
static inline void -list_update_cgroup_event(struct perf_event *event, - struct perf_event_context *ctx, bool add) +perf_cgroup_event_enable(struct perf_event *event, struct perf_event_context *ctx) { }
+static inline void +perf_cgroup_event_disable(struct perf_event *event, struct perf_event_context *ctx) +{ +} #endif
/* @@ -1682,13 +1692,14 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx) add_event_to_groups(event, ctx); }
- list_update_cgroup_event(event, ctx, true); - list_add_rcu(&event->event_entry, &ctx->event_list); ctx->nr_events++; if (event->attr.inherit_stat) ctx->nr_stat++;
+ if (event->state > PERF_EVENT_STATE_OFF) + perf_cgroup_event_enable(event, ctx); + ctx->generation++; }
@@ -1864,8 +1875,6 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
event->attach_state &= ~PERF_ATTACH_CONTEXT;
- list_update_cgroup_event(event, ctx, false); - ctx->nr_events--; if (event->attr.inherit_stat) ctx->nr_stat--; @@ -1882,8 +1891,10 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx) * of error state is by explicit re-enabling * of the event */ - if (event->state > PERF_EVENT_STATE_OFF) + if (event->state > PERF_EVENT_STATE_OFF) { + perf_cgroup_event_disable(event, ctx); perf_event_set_state(event, PERF_EVENT_STATE_OFF); + }
ctx->generation++; } @@ -2114,6 +2125,7 @@ event_sched_out(struct perf_event *event,
if (READ_ONCE(event->pending_disable) >= 0) { WRITE_ONCE(event->pending_disable, -1); + perf_cgroup_event_disable(event, ctx); state = PERF_EVENT_STATE_OFF; } perf_event_set_state(event, state); @@ -2250,6 +2262,7 @@ static void __perf_event_disable(struct perf_event *event, event_sched_out(event, cpuctx, ctx);
perf_event_set_state(event, PERF_EVENT_STATE_OFF); + perf_cgroup_event_disable(event, ctx); }
/* @@ -2633,7 +2646,7 @@ static int __perf_install_in_context(void *info) }
#ifdef CONFIG_CGROUP_PERF - if (is_cgroup_event(event)) { + if (event->state > PERF_EVENT_STATE_OFF && is_cgroup_event(event)) { /* * If the current cgroup doesn't match the event's * cgroup, we should not try to schedule it. @@ -2793,6 +2806,7 @@ static void __perf_event_enable(struct perf_event *event, ctx_sched_out(ctx, cpuctx, EVENT_TIME);
perf_event_set_state(event, PERF_EVENT_STATE_INACTIVE); + perf_cgroup_event_enable(event, ctx);
if (!ctx->is_active) return; @@ -3447,8 +3461,10 @@ static int merge_sched_in(struct perf_event *event, void *data) }
if (event->state == PERF_EVENT_STATE_INACTIVE) { - if (event->attr.pinned) + if (event->attr.pinned) { + perf_cgroup_event_disable(event, ctx); perf_event_set_state(event, PERF_EVENT_STATE_ERROR); + }
sid->can_add_hw = 0; sid->ctx->rotate_necessary = 1;