weaselab/conflict-set
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Use group leader fd

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Events in the same group should be associated with the same set of
instructions
This commit is contained in:
Andrew Noyes
2024-08-16 15:35:35 -07:00
parent 2952abe811
commit 159f2eef74
1 changed files with 13 additions and 4 deletions
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17
ServerBench.cpp
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@@ -171,7 +171,8 @@ double toSeconds(timeval t) {
#ifdef __linux__
#include <linux/perf_event.h>
struct PerfCounter {
PerfCounter(int type, int config, const std::string &labels = {})
PerfCounter(int type, int config, const std::string &labels = {},
int groupLeaderFd = -1)
: labels(labels) {
struct perf_event_attr pe;
@@ -183,7 +184,7 @@ struct PerfCounter {
pe.exclude_kernel = 1;
pe.exclude_hv = 1;
fd = perf_event_open(&pe, 0, -1, -1, 0);
fd = perf_event_open(&pe, 0, -1, groupLeaderFd, 0);
if (fd < 0 && errno != ENOENT && errno != EINVAL) {
perror(labels.c_str());
}
@@ -214,6 +215,7 @@ struct PerfCounter {
bool ok() const { return fd >= 0; }
const std::string &getLabels() const { return labels; }
int getFd() const { return fd; }
private:
int fd;
@@ -246,7 +248,8 @@ int main(int argc, char **argv) {
cs.getMetricsV1(&metrics, &metricsCount);
PerfCounter instructions{PERF_TYPE_HARDWARE, PERF_COUNT_HW_INSTRUCTIONS};
PerfCounter cycles{PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES};
PerfCounter cycles{PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES, "",
instructions.getFd()};
std::vector<PerfCounter> cacheCounters;
for (auto [id, idStr] : std::initializer_list<std::pair<int, std::string>>{
@@ -265,6 +268,7 @@ int main(int argc, char **argv) {
{PERF_COUNT_HW_CACHE_OP_WRITE, "write"},
{PERF_COUNT_HW_CACHE_OP_PREFETCH, "prefetch"},
}) {
int groupLeaderFd = -1;
for (auto [result, resultStr] :
std::initializer_list<std::pair<int, std::string>>{
{PERF_COUNT_HW_CACHE_RESULT_MISS, "miss"},
@@ -273,9 +277,14 @@ int main(int argc, char **argv) {
auto labels = "{id=\"" + idStr + "\", op=\"" + opStr +
"\", result=\"" + resultStr + "\"}";
cacheCounters.emplace_back(PERF_TYPE_HW_CACHE,
id | (op << 8) | (result << 16), labels);
id | (op << 8) | (result << 16), labels,
groupLeaderFd);
if (!cacheCounters.back().ok()) {
cacheCounters.pop_back();
} else {
if (groupLeaderFd == -1) {
groupLeaderFd = cacheCounters.back().getFd();
}
}
}
}