Measure total time in state
This measure is not affected by uid removals and is monotonic. That
makes it a good fit for CPU telemetry in statsd.
Bug: 174245730
Test: manually compare total with uid breakdown
Test: atest libtimeinstate_test
Change-Id: I8f17348f6eed49474826a1bd1cbd150207171e2c
diff --git a/libs/cputimeinstate/cputimeinstate.cpp b/libs/cputimeinstate/cputimeinstate.cpp
index 4209dc5..2e72cc4 100644
--- a/libs/cputimeinstate/cputimeinstate.cpp
+++ b/libs/cputimeinstate/cputimeinstate.cpp
@@ -56,6 +56,7 @@
static std::vector<std::vector<uint32_t>> gPolicyFreqs;
static std::vector<std::vector<uint32_t>> gPolicyCpus;
static std::set<uint32_t> gAllFreqs;
+static unique_fd gTisTotalMapFd;
static unique_fd gTisMapFd;
static unique_fd gConcurrentMapFd;
static unique_fd gUidLastUpdateMapFd;
@@ -129,6 +130,10 @@
gPolicyCpus.emplace_back(*cpus);
}
+ gTisTotalMapFd =
+ unique_fd{bpf_obj_get(BPF_FS_PATH "map_time_in_state_total_time_in_state_map")};
+ if (gTisTotalMapFd < 0) return false;
+
gTisMapFd = unique_fd{bpf_obj_get(BPF_FS_PATH "map_time_in_state_uid_time_in_state_map")};
if (gTisMapFd < 0) return false;
@@ -239,6 +244,31 @@
return gPolicyFreqs;
}
+std::optional<std::vector<std::vector<uint64_t>>> getTotalCpuFreqTimes() {
+ if (!gInitialized && !initGlobals()) return {};
+
+ std::vector<std::vector<uint64_t>> out;
+ uint32_t maxFreqCount = 0;
+ for (const auto &freqList : gPolicyFreqs) {
+ if (freqList.size() > maxFreqCount) maxFreqCount = freqList.size();
+ out.emplace_back(freqList.size(), 0);
+ }
+
+ std::vector<uint64_t> vals(gNCpus);
+ const uint32_t freqCount = maxFreqCount <= MAX_FREQS_FOR_TOTAL ? maxFreqCount :
+ MAX_FREQS_FOR_TOTAL;
+ for (uint32_t freqIdx = 0; freqIdx < freqCount; ++freqIdx) {
+ if (findMapEntry(gTisTotalMapFd, &freqIdx, vals.data())) return {};
+ for (uint32_t policyIdx = 0; policyIdx < gNPolicies; ++policyIdx) {
+ if (freqIdx >= gPolicyFreqs[policyIdx].size()) continue;
+ for (const auto &cpu : gPolicyCpus[policyIdx]) {
+ out[policyIdx][freqIdx] += vals[cpu];
+ }
+ }
+ }
+
+ return out;
+}
// Retrieve the times in ns that uid spent running at each CPU frequency.
// Return contains no value on error, otherwise it contains a vector of vectors using the format:
// [[t0_0, t0_1, ...],