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Patch in this message | | | From | "Yan, Zheng" <> | Subject | [PATCH 09/15] perf: Track system-wide LBR users and LBR callstack users | Date | Wed, 11 Dec 2013 15:10:54 +0800 |
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From: "Yan, Zheng" <zheng.z.yan@intel.com>
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> --- arch/x86/kernel/cpu/perf_event.h | 1 + arch/x86/kernel/cpu/perf_event_intel_lbr.c | 25 ++++++++++++++++++++++++- 2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h index 3ed9629..bcc8e1f 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -150,6 +150,7 @@ struct cpu_hw_events { * Intel LBR bits */ int lbr_users; + int lbr_sys_users; struct perf_branch_stack lbr_stack; struct perf_branch_entry lbr_entries[MAX_LBR_ENTRIES]; struct er_account *lbr_sel; diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c index c33bf84c..f57960d 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c +++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c @@ -201,15 +201,29 @@ void intel_pmu_lbr_sched_task(struct perf_event_context *ctx, bool sched_in) intel_pmu_lbr_reset(); } +static inline bool branch_user_callstack(unsigned br_sel) +{ + return (br_sel & X86_BR_USER) && (br_sel & X86_BR_CALL_STACK); +} + void intel_pmu_lbr_enable(struct perf_event *event) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); + struct x86_perf_task_context *task_ctx; if (!x86_pmu.lbr_nr) return; + cpuc = &__get_cpu_var(cpu_hw_events); + task_ctx = event->ctx ? event->ctx->task_ctx_data : NULL; + cpuc->br_sel = event->hw.branch_reg.reg; + if (!(event->attach_state & PERF_ATTACH_TASK)) + cpuc->lbr_sys_users++; + else if (branch_user_callstack(cpuc->br_sel)) + task_ctx->lbr_callstack_users++; + cpuc->lbr_users++; if (cpuc->lbr_users == 1) perf_sched_cb_enable(event->ctx->pmu); @@ -217,11 +231,20 @@ void intel_pmu_lbr_enable(struct perf_event *event) void intel_pmu_lbr_disable(struct perf_event *event) { - struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); + struct cpu_hw_events *cpuc; + struct x86_perf_task_context *task_ctx; if (!x86_pmu.lbr_nr) return; + cpuc = &__get_cpu_var(cpu_hw_events); + task_ctx = event->ctx ? event->ctx->task_ctx_data : NULL; + + if (!(event->attach_state & PERF_ATTACH_TASK)) + cpuc->lbr_sys_users--; + else if (branch_user_callstack(cpuc->br_sel)) + task_ctx->lbr_callstack_users--; + cpuc->lbr_users--; WARN_ON_ONCE(cpuc->lbr_users < 0); -- 1.8.1.4
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