diff options
Diffstat (limited to 'tools/perf/arch/x86/util/evsel.c')
| -rw-r--r-- | tools/perf/arch/x86/util/evsel.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/tools/perf/arch/x86/util/evsel.c b/tools/perf/arch/x86/util/evsel.c index e67701d26f24..23a8e662a912 100644 --- a/tools/perf/arch/x86/util/evsel.c +++ b/tools/perf/arch/x86/util/evsel.c @@ -4,6 +4,7 @@ #include <stdlib.h> #include "util/evlist.h" #include "util/evsel.h" +#include "util/evsel_config.h" #include "util/env.h" #include "util/pmu.h" #include "util/pmus.h" @@ -71,6 +72,57 @@ int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) event_name); } +void arch_evsel__apply_ratio_to_prev(struct evsel *evsel, + struct perf_event_attr *attr) +{ + struct perf_event_attr *prev_attr = NULL; + struct evsel *evsel_prev = NULL; + const char *name = "acr_mask"; + int evsel_idx = 0; + __u64 ev_mask, pr_ev_mask; + + if (!perf_pmu__has_format(evsel->pmu, name)) { + pr_err("'%s' does not have acr_mask format support\n", evsel->pmu->name); + return; + } + if (perf_pmu__format_type(evsel->pmu, name) != + PERF_PMU_FORMAT_VALUE_CONFIG2) { + pr_err("'%s' does not have config2 format support\n", evsel->pmu->name); + return; + } + + evsel_prev = evsel__prev(evsel); + if (!evsel_prev) { + pr_err("Previous event does not exist.\n"); + return; + } + + prev_attr = &evsel_prev->core.attr; + + if (prev_attr->config2) { + pr_err("'%s' has set config2 (acr_mask?) already, configuration not supported\n", evsel_prev->name); + return; + } + + /* + * acr_mask (config2) is calculated using the event's index in + * the event group. The first event will use the index of the + * second event as its mask (e.g., 0x2), indicating that the + * second event counter will be reset and a sample taken for + * the first event if its counter overflows. The second event + * will use the mask consisting of the first and second bits + * (e.g., 0x3), meaning both counters will be reset if the + * second event counter overflows. + */ + + evsel_idx = evsel__group_idx(evsel); + ev_mask = 1ull << evsel_idx; + pr_ev_mask = 1ull << (evsel_idx - 1); + + prev_attr->config2 = ev_mask; + attr->config2 = ev_mask | pr_ev_mask; +} + static void ibs_l3miss_warn(void) { pr_warning( |