cutils: schedpolicy: Add debug code to log sched policy transitions
Signed-off-by: San Mehat <san@google.com>
diff --git a/libcutils/sched_policy.c b/libcutils/sched_policy.c
index 93fcd4a..8357bba 100644
--- a/libcutils/sched_policy.c
+++ b/libcutils/sched_policy.c
@@ -23,6 +23,9 @@
#include <errno.h>
#include <fcntl.h>
+#define LOG_TAG "SchedPolicy"
+#include "cutils/log.h"
+
#ifdef HAVE_SCHED_H
#include <sched.h>
@@ -37,6 +40,8 @@
#define SCHED_BATCH 3
#endif
+#define POLICY_DEBUG 1
+
static int __sys_supports_schedgroups = -1;
static int add_tid_to_cgroup(int tid, const char *grp_name)
@@ -155,6 +160,38 @@
{
initialize();
+#if POLICY_DEBUG
+ char statfile[64];
+ char statline[1024];
+ char thread_name[255];
+ int fd;
+
+ sprintf(statfile, "/proc/%d/stat", tid);
+ memset(thread_name, 0, sizeof(thread_name));
+
+ fd = open(statfile, O_RDONLY);
+ if (fd >= 0) {
+ int rc = read(fd, statline, 1023);
+ close(fd);
+ statline[rc] = 0;
+ char *p = statline;
+ char *q;
+
+ for (p = statline; *p != '('; p++);
+ p++;
+ for (q = p; *q != ')'; q++);
+
+ strncpy(thread_name, p, (q-p));
+ }
+ if (policy == SP_BACKGROUND) {
+ LOGD("vvv tid %d (%s)", tid, thread_name);
+ } else if (policy == SP_FOREGROUND) {
+ LOGD("^^^ tid %d (%s)", tid, thread_name);
+ } else {
+ LOGD("??? tid %d (%s)", tid, thread_name);
+ }
+#endif
+
if (__sys_supports_schedgroups) {
const char *grp = NULL;