Implementation of EDZL

This patch implements the global EDZL scheduler.  It is based
heavily on the GSN-EDF implementation.  Timers are used to detect
zero-laxity points and issue the proper rescheduling operations.

1 files changed, 14 insertions, 0 deletions

diff --git a/include/litmus/rt_param.h b/include/litmus/rt_param.h
index a7a183f34a80..53741727d5d0 100644
--- a/include/litmus/rt_param.h
+++ b/include/litmus/rt_param.h
@@ -82,6 +82,14 @@ struct rt_job {
         /* How much service has this job received so far? */
         lt_t    exec_time;
 
+#ifdef CONFIG_PLUGIN_EDZL
+        /* boolean indicating zero-laxity state.  We will
+           set this flag explicitly at zero-laxity detection.
+           This makes priority comparison operations more
+           predictable since laxity varies with time */
+        int     zero_laxity;
+#endif
+
         /* Which job is this. This is used to let user space
          * specify which job to wait for, which is important if jobs
          * overrun. If we just call sys_sleep_next_period() then we
@@ -114,6 +122,12 @@ struct rt_param {
         /* timing parameters */
         struct rt_job           job_params;
 
+#ifdef CONFIG_PLUGIN_EDZL
+        unsigned int            zl_timer_armed:1;
+        /* used to trigger zero-laxity detection */
+        struct hrtimer          zl_timer;
+#endif
+
         /* task representing the current "inherited" task
          * priority, assigned by inherit_priority and
          * return priority in the scheduler plugins.