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| author | Kan Liang <kan.liang@linux.intel.com> | 2025-12-05 16:16:38 -0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-12-17 13:31:03 +0100 |
| commit | b9e52b11d2e5e403afaf69a7f8d6b29f8380ed38 (patch) | |
| tree | 002bbd2db8a051c3f4c40034aa64e188fa7ed7fb /kernel | |
| parent | b825444b6179eb071e66ca3da5ac12d4dbd808d5 (diff) | |
| download | linux-b9e52b11d2e5e403afaf69a7f8d6b29f8380ed38.tar.gz linux-b9e52b11d2e5e403afaf69a7f8d6b29f8380ed38.zip | |
perf: Add generic exclude_guest support
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 <kan.liang@linux.intel.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Xudong Hao <xudong.hao@intel.com>
Link: https://patch.msgid.link/20251206001720.468579-3-seanjc@google.com
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 406371ce45f2..fab358daa42e 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2870,14 +2870,15 @@ 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); } /* @@ -2933,7 +2934,7 @@ 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); @@ -4151,7 +4152,7 @@ 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); |