1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include "util/evsel.h" 5 #include "util/env.h" 6 #include "linux/string.h" 7 8 void arch_evsel__set_sample_weight(struct evsel *evsel) 9 { 10 evsel__set_sample_bit(evsel, WEIGHT_STRUCT); 11 } 12 13 void arch_evsel__fixup_new_cycles(struct perf_event_attr *attr) 14 { 15 struct perf_env env = { .total_mem = 0, } ; 16 17 if (!perf_env__cpuid(&env)) 18 return; 19 20 /* 21 * On AMD, precise cycles event sampling internally uses IBS pmu. 22 * But IBS does not have filtering capabilities and perf by default 23 * sets exclude_guest = 1. This makes IBS pmu event init fail and 24 * thus perf ends up doing non-precise sampling. Avoid it by clearing 25 * exclude_guest. 26 */ 27 if (env.cpuid && strstarts(env.cpuid, "AuthenticAMD")) 28 attr->exclude_guest = 0; 29 30 free(env.cpuid); 31 } 32