update machinery: fix for update_stat() on linux

diff --git a/src/linux.c b/src/linux.c
index cc15b3f..60360d5 100644 (file)
--- a/src/linux.c
+++ b/src/linux.c
@@ -616,6 +616,14 @@ inline static void update_stat(void)
        const char *stat_template = NULL;
        unsigned int malloc_cpu_size = 0;
        extern void* global_cpu;
+       static double last_stat_update = 0.0;
+
+       /* since we use wrappers for this function, the update machinery
+        * can't eliminate double invocations of this function. Check for
+        * them here, otherwise cpu_usage counters are freaking out. */
+       if (last_stat_update == current_update_time)
+               return;
+       last_stat_update = current_update_time;
 
        /* add check for !info.cpu_usage since that mem is freed on a SIGUSR1 */
        if (!cpu_setup || !info.cpu_usage) {