From 8c977a17996eb106e9dfd8d37d2eb510dd2c235e Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Tue, 20 May 2025 11:16:38 -0700 Subject: [PATCH] alpha/perf: Remove driver-specific throttle support The throttle support has been added in the generic code. Remove the driver-specific throttle support. Besides the throttle, perf_event_overflow may return true because of event_limit. It already does an inatomic event disable. The pmu->stop is not required either. Signed-off-by: Kan Liang Signed-off-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20250520181644.2673067-11-kan.liang@linux.intel.com --- arch/alpha/kernel/perf_event.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c index 1f0eb4f25c0ff..a3eaab094ece0 100644 --- a/arch/alpha/kernel/perf_event.c +++ b/arch/alpha/kernel/perf_event.c @@ -852,14 +852,9 @@ static void alpha_perf_event_irq_handler(unsigned long la_ptr, alpha_perf_event_update(event, hwc, idx, alpha_pmu->pmc_max_period[idx]+1); perf_sample_data_init(&data, 0, hwc->last_period); - if (alpha_perf_event_set_period(event, hwc, idx)) { - if (perf_event_overflow(event, &data, regs)) { - /* Interrupts coming too quickly; "throttle" the - * counter, i.e., disable it for a little while. - */ - alpha_pmu_stop(event, 0); - } - } + if (alpha_perf_event_set_period(event, hwc, idx)) + perf_event_overflow(event, &data, regs); + wrperfmon(PERFMON_CMD_ENABLE, cpuc->idx_mask); return; -- 2.47.2