X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Ftimeval.c;h=88a6679eab039f97676bb44710dc211cb0e51f75;hb=ff8d7a5e81625bbb13d33ca73888fc848b02db83;hp=84c90f36ce09df0247bf1b77e0904ed8fdbaaf81;hpb=14865427e666d21baef05fe14874784bf2108c6f;p=openvswitch

diff --git a/lib/timeval.c b/lib/timeval.c
index 84c90f36..88a6679e 100644
--- a/lib/timeval.c
+++ b/lib/timeval.c
@@ -26,6 +26,7 @@
 #include <unistd.h>
 #include "coverage.h"
 #include "fatal-signal.h"
+#include "signals.h"
 #include "util.h"
 #include "vlog.h"
 
@@ -58,8 +59,9 @@ static void refresh_monotonic_if_ticked(void);
 static time_t time_add(time_t, time_t);
 static void block_sigalrm(sigset_t *);
 static void unblock_sigalrm(const sigset_t *);
-static void log_poll_interval(long long int last_wakeup,
-                              const struct rusage *last_rusage);
+static void log_poll_interval(long long int last_wakeup);
+static struct rusage *get_recent_rusage(void);
+static void refresh_rusage(void);
 
 /* Initializes the timetracking module.
  *
@@ -96,9 +98,7 @@ set_up_signal(int flags)
     sa.sa_handler = sigalrm_handler;
     sigemptyset(&sa.sa_mask);
     sa.sa_flags = flags;
-    if (sigaction(SIGALRM, &sa, NULL)) {
-        ovs_fatal(errno, "sigaction(SIGALRM) failed");
-    }
+    xsigaction(SIGALRM, &sa, NULL);
 }
 
 /* Remove SA_RESTART from the flags for SIGALRM, so that any system call that
@@ -137,7 +137,7 @@ set_up_timer(void)
     struct itimerspec itimer;
 
     if (timer_create(monotonic_clock, NULL, &timer_id)) {
-        ovs_fatal(errno, "timer_create failed");
+        VLOG_FATAL("timer_create failed (%s)", strerror(errno));
     }
 
     itimer.it_interval.tv_sec = 0;
@@ -145,7 +145,7 @@ set_up_timer(void)
     itimer.it_value = itimer.it_interval;
 
     if (timer_settime(timer_id, 0, &itimer, NULL)) {
-        ovs_fatal(errno, "timer_settime failed");
+        VLOG_FATAL("timer_settime failed (%s)", strerror(errno));
     }
 }
 
@@ -281,14 +281,13 @@ int
 time_poll(struct pollfd *pollfds, int n_pollfds, int timeout)
 {
     static long long int last_wakeup;
-    static struct rusage last_rusage;
     long long int start;
     sigset_t oldsigs;
     bool blocked;
     int retval;
 
     time_refresh();
-    log_poll_interval(last_wakeup, &last_rusage);
+    log_poll_interval(last_wakeup);
     coverage_clear();
     start = time_msec();
     blocked = false;
@@ -319,7 +318,7 @@ time_poll(struct pollfd *pollfds, int n_pollfds, int timeout)
         unblock_sigalrm(&oldsigs);
     }
     last_wakeup = time_msec();
-    getrusage(RUSAGE_SELF, &last_rusage);
+    refresh_rusage();
     return retval;
 }
 
@@ -364,17 +363,13 @@ block_sigalrm(sigset_t *oldsigs)
     sigset_t sigalrm;
     sigemptyset(&sigalrm);
     sigaddset(&sigalrm, SIGALRM);
-    if (sigprocmask(SIG_BLOCK, &sigalrm, oldsigs)) {
-        ovs_fatal(errno, "sigprocmask");
-    }
+    xsigprocmask(SIG_BLOCK, &sigalrm, oldsigs);
 }
 
 static void
 unblock_sigalrm(const sigset_t *oldsigs)
 {
-    if (sigprocmask(SIG_SETMASK, oldsigs, NULL)) {
-        ovs_fatal(errno, "sigprocmask");
-    }
+    xsigprocmask(SIG_SETMASK, oldsigs, NULL);
 }
 
 long long int
@@ -389,6 +384,14 @@ timeval_to_msec(const struct timeval *tv)
     return (long long int) tv->tv_sec * 1000 + tv->tv_usec / 1000;
 }
 
+void
+xgettimeofday(struct timeval *tv)
+{
+    if (gettimeofday(tv, NULL) == -1) {
+        VLOG_FATAL("gettimeofday failed (%s)", strerror(errno));
+    }
+}
+
 static long long int
 timeval_diff_msec(const struct timeval *a, const struct timeval *b)
 {
@@ -396,7 +399,7 @@ timeval_diff_msec(const struct timeval *a, const struct timeval *b)
 }
 
 static void
-log_poll_interval(long long int last_wakeup, const struct rusage *last_rusage)
+log_poll_interval(long long int last_wakeup)
 {
     static unsigned int mean_interval; /* In 16ths of a millisecond. */
     static unsigned int n_samples;
@@ -412,6 +415,7 @@ log_poll_interval(long long int last_wakeup, const struct rusage *last_rusage)
     /* Warn if we took too much time between polls: at least 50 ms and at least
      * 8X the mean interval. */
     if (n_samples > 10 && interval > mean_interval * 8 && interval > 50 * 16) {
+        const struct rusage *last_rusage = get_recent_rusage();
         struct rusage rusage;
 
         getrusage(RUSAGE_SELF, &rusage);
@@ -457,3 +461,55 @@ log_poll_interval(long long int last_wakeup, const struct rusage *last_rusage)
         mean_interval = interval;
     }
 }
+
+/* CPU usage tracking. */
+
+struct cpu_usage {
+    long long int when;         /* Time that this sample was taken. */
+    unsigned long long int cpu; /* Total user+system CPU usage when sampled. */
+};
+
+static struct rusage recent_rusage;
+static struct cpu_usage older = { LLONG_MIN, 0 };
+static struct cpu_usage newer = { LLONG_MIN, 0 };
+static int cpu_usage = -1;
+
+static struct rusage *
+get_recent_rusage(void)
+{
+    return &recent_rusage;
+}
+
+static void
+refresh_rusage(void)
+{
+    long long int now;
+
+    now = time_msec();
+    getrusage(RUSAGE_SELF, &recent_rusage);
+
+    if (now >= newer.when + 3 * 1000) {
+        older = newer;
+        newer.when = now;
+        newer.cpu = (timeval_to_msec(&recent_rusage.ru_utime) +
+                     timeval_to_msec(&recent_rusage.ru_stime));
+
+        if (older.when != LLONG_MIN && newer.cpu > older.cpu) {
+            unsigned int dividend = newer.cpu - older.cpu;
+            unsigned int divisor = (newer.when - older.when) / 100;
+            cpu_usage = divisor > 0 ? dividend / divisor : -1;
+        } else {
+            cpu_usage = -1;
+        }
+    }
+}
+
+/* Returns an estimate of this process's CPU usage, as a percentage, over the
+ * past few seconds of wall-clock time.  Returns -1 if no estimate is available
+ * (which will happen if the process has not been running long enough to have
+ * an estimate, and can happen for other reasons as well). */
+int
+get_cpu_usage(void)
+{
+    return cpu_usage;
+}