diff options
Diffstat (limited to 'simpleperf/event_fd.cpp')
| -rw-r--r-- | simpleperf/event_fd.cpp | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/simpleperf/event_fd.cpp b/simpleperf/event_fd.cpp index 808639bd..80becb20 100644 --- a/simpleperf/event_fd.cpp +++ b/simpleperf/event_fd.cpp @@ -31,6 +31,7 @@ #include <android-base/logging.h> #include <android-base/stringprintf.h> +#include "environment.h" #include "event_type.h" #include "perf_event.h" #include "utils.h" @@ -44,13 +45,20 @@ static int perf_event_open(perf_event_attr* attr, pid_t pid, int cpu, int group_ std::unique_ptr<EventFd> EventFd::OpenEventFile(const perf_event_attr& attr, pid_t tid, int cpu, bool report_error) { - perf_event_attr perf_attr = attr; std::string event_name = "unknown event"; - const EventType* event_type = FindEventTypeByConfig(perf_attr.type, perf_attr.config); + const EventType* event_type = FindEventTypeByConfig(attr.type, attr.config); if (event_type != nullptr) { event_name = event_type->name; } - int perf_event_fd = perf_event_open(&perf_attr, tid, cpu, -1, 0); + perf_event_attr real_attr = attr; + if (attr.freq) { + uint64_t max_sample_freq; + if (GetMaxSampleFrequency(&max_sample_freq) && max_sample_freq < attr.sample_freq) { + PLOG(INFO) << "Adjust sample freq to max allowed sample freq " << max_sample_freq; + real_attr.sample_freq = max_sample_freq; + } + } + int perf_event_fd = perf_event_open(&real_attr, tid, cpu, -1, 0); if (perf_event_fd == -1) { if (report_error) { PLOG(ERROR) << "open perf_event_file (event " << event_name << ", tid " << tid << ", cpu " |