Commit d058c7d5 authored May 20, 2025 by Kan Liang Committed by Peter Zijlstra May 21, 2025

perf/x86/amd: 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 <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ravi Bangoria <ravi.bangoria@amd.com>
Link: https://lore.kernel.org/r/20250520181644.2673067-5-kan.liang@linux.intel.com

parent b8328f67

arch/x86/events/amd/core.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -1003,8 +1003,7 @@ static int amd_pmu_v2_handle_irq(struct pt_regs *regs)

		perf_sample_save_brstack(&data, event, &cpuc->lbr_stack, NULL);

		if (perf_event_overflow(event, &data, regs))
		x86_pmu_stop(event, 0);
		perf_event_overflow(event, &data, regs);
		}

		/*

arch/x86/events/amd/ibs.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -1373,9 +1373,7 @@ static int perf_ibs_handle_irq(struct perf_ibs perf_ibs, struct pt_regs iregs)
		hwc->sample_period = perf_ibs->min_period;

		out:
		if (throttle) {
		perf_ibs_stop(event, 0);
		} else {
		if (!throttle) {
		if (perf_ibs == &perf_ibs_op) {
		if (ibs_caps & IBS_CAPS_OPCNTEXT) {
		new_config = period & IBS_OP_MAX_CNT_EXT_MASK;