[PATCH] xen/sched_credit: Use delay to control scheduling frequency

[Hui Lv <hui.lv@intel.com>]

Updated the warning sentence for ratelimit_us.

This patch can improve Xen performance:
1. Basically, the "delay method" can achieve 11% overall performance boost for SPECvirt than original credit scheduler.
2. We have tried 1ms delay and 10ms delay, there is no big difference between these two configurations. (1ms is enough to achieve a good performance)
3. We have compared different load level response time/latency (low, high, peak), "delay method" didn't bring very much response time increase.
4. 1ms delay can reduce 30% context switch at peak performance, where produces the benefits. (int sched_ratelimit_us = 1000 is the recommended setting)

Signed-off-by: Hui Lv <hui.lv@intel.com>
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>

Acked-by: George Dunlap <george.dunlap@eu.citrix.com>

diff -r a4bff36780a3 -r fe8d0ca867aa xen/common/sched_credit.c
--- a/xen/common/sched_credit.c	Fri Dec 16 18:46:27 2011 +0000
+++ b/xen/common/sched_credit.c	Mon Jan 09 05:21:35 2012 -0500
@@ -172,6 +172,7 @@ struct csched_private {
     uint32_t credit;
     int credit_balance;
     uint32_t runq_sort;
+    unsigned ratelimit_us;
     /* Period of master and tick in milliseconds */
     unsigned tslice_ms, tick_period_us, ticks_per_tslice;
     unsigned credits_per_tslice;
@@ -1297,10 +1298,15 @@ csched_schedule(
     struct csched_private *prv = CSCHED_PRIV(ops);
     struct csched_vcpu *snext;
     struct task_slice ret;
+    s_time_t runtime, tslice;
 
     CSCHED_STAT_CRANK(schedule);
     CSCHED_VCPU_CHECK(current);
 
+    runtime = now - current->runstate.state_entry_time;
+    if ( runtime < 0 ) /* Does this ever happen? */
+        runtime = 0;
+
     if ( !is_idle_vcpu(scurr->vcpu) )
     {
         /* Update credits of a non-idle VCPU. */
@@ -1313,6 +1319,35 @@ csched_schedule(
         scurr->pri = CSCHED_PRI_IDLE;
     }
 
+    /* Choices, choices:
+     * - If we have a tasklet, we need to run the idle vcpu no matter what.
+     * - If sched rate limiting is in effect, and the current vcpu has
+     *   run for less than that amount of time, continue the current one,
+     *   but with a shorter timeslice and return it immediately
+     * - Otherwise, chose the one with the highest priority (which may
+     *   be the one currently running)
+     * - If the currently running one is TS_OVER, see if there
+     *   is a higher priority one waiting on the runqueue of another
+     *   cpu and steal it.
+     */
+
+    /* If we have schedule rate limiting enabled, check to see
+     * how long we've run for. */
+    if ( !tasklet_work_scheduled
+         && prv->ratelimit_us
+         && vcpu_runnable(current)
+         && !is_idle_vcpu(current)
+         && runtime < MICROSECS(prv->ratelimit_us) )
+    {
+        snext = scurr;
+        snext->start_time += now;
+        perfc_incr(delay_ms);
+        tslice = MICROSECS(prv->ratelimit_us);
+        ret.migrated = 0;
+        goto out;
+    }
+    tslice = MILLISECS(prv->tslice_ms);
+
     /*
      * Select next runnable local VCPU (ie top of local runq)
      */
@@ -1367,11 +1402,12 @@ csched_schedule(
     if ( !is_idle_vcpu(snext->vcpu) )
         snext->start_time += now;
 
+out:
     /*
      * Return task to run next...
      */
     ret.time = (is_idle_vcpu(snext->vcpu) ?
-                -1 : MILLISECS(prv->tslice_ms));
+                -1 : tslice);
     ret.task = snext->vcpu;
 
     CSCHED_VCPU_CHECK(ret.task);
@@ -1533,6 +1569,15 @@ csched_init(struct scheduler *ops)
     prv->tick_period_us = prv->tslice_ms * 1000 / prv->ticks_per_tslice;
     prv->credits_per_tslice = CSCHED_CREDITS_PER_MSEC * prv->tslice_ms;
 
+    if ( MICROSECS(sched_ratelimit_us) > MILLISECS(sched_credit_tslice_ms) )
+    {
+        printk("WARNING: sched_ratelimit_us >" 
+               "sched_credit_tslice_ms is undefined\n"
+               "Setting ratelimit_us to 1000 * tslice_ms\n");
+        prv->ratelimit_us = 1000 * prv->tslice_ms;
+    }
+    else
+        prv->ratelimit_us = sched_ratelimit_us;
     return 0;
 }
 
diff -r a4bff36780a3 -r fe8d0ca867aa xen/common/schedule.c
--- a/xen/common/schedule.c	Fri Dec 16 18:46:27 2011 +0000
+++ b/xen/common/schedule.c	Mon Jan 09 05:21:35 2012 -0500
@@ -47,6 +47,11 @@ string_param("sched", opt_sched);
 bool_t sched_smt_power_savings = 0;
 boolean_param("sched_smt_power_savings", sched_smt_power_savings);
 
+/* Default scheduling rate limit: 1ms 
+ * The behavior when sched_ratelimit_us is greater than sched_credit_tslice_ms is undefined
+ * */
+int sched_ratelimit_us = 1000;
+integer_param("sched_ratelimit_us", sched_ratelimit_us);
 /* Various timer handlers. */
 static void s_timer_fn(void *unused);
 static void vcpu_periodic_timer_fn(void *data);
diff -r a4bff36780a3 -r fe8d0ca867aa xen/include/xen/perfc_defn.h
--- a/xen/include/xen/perfc_defn.h	Fri Dec 16 18:46:27 2011 +0000
+++ b/xen/include/xen/perfc_defn.h	Mon Jan 09 05:21:35 2012 -0500
@@ -16,6 +16,7 @@ PERFCOUNTER(sched_irq,              "sch
 PERFCOUNTER(sched_run,              "sched: runs through scheduler")
 PERFCOUNTER(sched_ctx,              "sched: context switches")
 
+PERFCOUNTER(delay_ms,               "csched: delay")
 PERFCOUNTER(vcpu_check,             "csched: vcpu_check")
 PERFCOUNTER(schedule,               "csched: schedule")
 PERFCOUNTER(acct_run,               "csched: acct_run")
diff -r a4bff36780a3 -r fe8d0ca867aa xen/include/xen/sched-if.h
--- a/xen/include/xen/sched-if.h	Fri Dec 16 18:46:27 2011 +0000
+++ b/xen/include/xen/sched-if.h	Mon Jan 09 05:21:35 2012 -0500
@@ -16,6 +16,11 @@ extern struct cpupool *cpupool0;
 /* cpus currently in no cpupool */
 extern cpumask_t cpupool_free_cpus;
 
+/* Scheduler generic parameters
+ * */
+extern int sched_ratelimit_us;
+
+
 /*
  * In order to allow a scheduler to remap the lock->cpu mapping,
  * we have a per-cpu pointer, along with a pre-allocated set of