diff options
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index fa6fdec5afbc..66f8ba9a67f9 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -574,16 +574,25 @@ static bool __perf_sched_find_counter(struct perf_sched *sched) c = sched->constraints[sched->state.event]; + /* Prefer fixed purpose counters */ + if (x86_pmu.num_counters_fixed) { + idx = X86_PMC_IDX_FIXED; + for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_MAX) { + if (!__test_and_set_bit(idx, sched->state.used)) + goto done; + } + } /* Grab the first unused counter starting with idx */ idx = sched->state.counter; - for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_MAX) { + for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_FIXED) { if (!__test_and_set_bit(idx, sched->state.used)) - break; + goto done; } - sched->state.counter = idx; - if (idx >= X86_PMC_IDX_MAX) - return false; + return false; + +done: + sched->state.counter = idx; if (c->overlap) perf_sched_save_state(sched); |