Some hacks for counting system wide events from userspace

d71d9231 · Silas Boyd-Wickizer · 3cb87418 · d71d9231
--- a/include/pmc.hh
+++ b/include/pmc.hh
+struct pmc_count {
+
+  static void config(u64 sel) {
+    perf_start(sel, 0);
+  }
+
+  static pmc_count read(unsigned int ctr) {
+    pmc_count n;
+
+    // XXX(sbw) we loose our original affinity
+    for (int i = 0; i < NCPU; i++) {
+      setaffinity(i);
+      n.count_[i] = rdpmc(ctr);
+    }
+    setaffinity(-1);
+    return n;
+  }
+
+  pmc_count delta(const pmc_count& o) {
+    pmc_count n;
+
+    for (int i = 0; i < NCPU; i++)
+      n.count_[i] = count_[i] - o.count_[i];
+    return n;
+  }
+
+  u64 sum() const {
+    u64 tot = 0;
+
+    for (int i = 0; i < NCPU; i++)
+      tot += count_[i];
+    return tot;
+  }
+
+  u64 count_[NCPU];
+};