[PATCH v6 02/44] perf: Add generic exclude_guest support
From: Sean Christopherson <seanjc@google.com>
Date: 2025-12-06 00:17:31
Also in:
kvm, kvm-riscv, kvmarm, linux-perf-users, linux-riscv, lkml, loongarch
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
From: Kan Liang <redacted> Only KVM knows the exact time when a guest is entering/exiting. Expose two interfaces to KVM to switch the ownership of the PMU resources. All the pinned events must be scheduled in first. Extend the perf_event_sched_in() helper to support extra flag, e.g., EVENT_GUEST. Signed-off-by: Kan Liang <redacted> Signed-off-by: Mingwei Zhang <redacted> Tested-by: Xudong Hao <redacted> Signed-off-by: Sean Christopherson <seanjc@google.com> --- kernel/events/core.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4cc95dd15620..1e37ab90b815 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c@@ -2872,14 +2872,15 @@ static void task_ctx_sched_out(struct perf_event_context *ctx, static void perf_event_sched_in(struct perf_cpu_context *cpuctx, struct perf_event_context *ctx, - struct pmu *pmu) + struct pmu *pmu, + enum event_type_t event_type) { - ctx_sched_in(&cpuctx->ctx, pmu, EVENT_PINNED); + ctx_sched_in(&cpuctx->ctx, pmu, EVENT_PINNED | event_type); if (ctx) - ctx_sched_in(ctx, pmu, EVENT_PINNED); - ctx_sched_in(&cpuctx->ctx, pmu, EVENT_FLEXIBLE); + ctx_sched_in(ctx, pmu, EVENT_PINNED | event_type); + ctx_sched_in(&cpuctx->ctx, pmu, EVENT_FLEXIBLE | event_type); if (ctx) - ctx_sched_in(ctx, pmu, EVENT_FLEXIBLE); + ctx_sched_in(ctx, pmu, EVENT_FLEXIBLE | event_type); } /*
@@ -2935,7 +2936,7 @@ static void ctx_resched(struct perf_cpu_context *cpuctx, else if (event_type & EVENT_PINNED) ctx_sched_out(&cpuctx->ctx, pmu, EVENT_FLEXIBLE); - perf_event_sched_in(cpuctx, task_ctx, pmu); + perf_event_sched_in(cpuctx, task_ctx, pmu, 0); for_each_epc(epc, &cpuctx->ctx, pmu, 0) perf_pmu_enable(epc->pmu);
@@ -4153,7 +4154,7 @@ static void perf_event_context_sched_in(struct task_struct *task) ctx_sched_out(&cpuctx->ctx, NULL, EVENT_FLEXIBLE); } - perf_event_sched_in(cpuctx, ctx, NULL); + perf_event_sched_in(cpuctx, ctx, NULL, 0); perf_ctx_sched_task_cb(cpuctx->task_ctx, task, true);
--
2.52.0.223.gf5cc29aaa4-goog