ia64/xen-unstable

changeset 19304:d035b66b5b4d

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xentrace: trace when we continue with the same task

Trace when the scheduler decides to continue running the same process.
This lets us see that this is happening for one; it also lets us see
domains in a trace which are actively running on pcpu but never
scheduled out.

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Mar 09 15:01:34 2009 +0000 (2009-03-09)
parents e7702951fc09
children dee5bc89873e b5d074255c38
files xen/common/schedule.c xen/include/public/trace.h
line diff
     1.1 --- a/xen/common/schedule.c	Mon Mar 09 13:52:59 2009 +0000
     1.2 +++ b/xen/common/schedule.c	Mon Mar 09 15:01:34 2009 +0000
     1.3 @@ -81,6 +81,20 @@ static inline void trace_runstate_change
     1.4      __trace_var(event, 1/*tsc*/, sizeof(d), (unsigned char *)&d);
     1.5  }
     1.6  
     1.7 +static inline void trace_continue_running(struct vcpu *v)
     1.8 +{
     1.9 +    struct { uint32_t vcpu:16, domain:16; } d;
    1.10 +
    1.11 +    if ( likely(!tb_init_done) )
    1.12 +        return;
    1.13 +
    1.14 +    d.vcpu = v->vcpu_id;
    1.15 +    d.domain = v->domain->domain_id;
    1.16 +
    1.17 +    __trace_var(TRC_SCHED_CONTINUE_RUNNING, 1/*tsc*/, sizeof(d),
    1.18 +                (unsigned char *)&d);
    1.19 +}
    1.20 +
    1.21  static inline void vcpu_runstate_change(
    1.22      struct vcpu *v, int new_state, s_time_t new_entry_time)
    1.23  {
    1.24 @@ -803,6 +817,7 @@ static void schedule(void)
    1.25      if ( unlikely(prev == next) )
    1.26      {
    1.27          spin_unlock_irq(&sd->schedule_lock);
    1.28 +        trace_continue_running(next);
    1.29          return continue_running(prev);
    1.30      }
    1.31  

     2.1 --- a/xen/include/public/trace.h	Mon Mar 09 13:52:59 2009 +0000
     2.2 +++ b/xen/include/public/trace.h	Mon Mar 09 15:01:34 2009 +0000
     2.3 @@ -60,7 +60,8 @@
     2.4  #define TRC_TRACE_WRAP_BUFFER  (TRC_GEN + 2)
     2.5  #define TRC_TRACE_CPU_CHANGE    (TRC_GEN + 3)
     2.6  
     2.7 -#define TRC_SCHED_RUNSTATE_CHANGE (TRC_SCHED_MIN + 1)
     2.8 +#define TRC_SCHED_RUNSTATE_CHANGE   (TRC_SCHED_MIN + 1)
     2.9 +#define TRC_SCHED_CONTINUE_RUNNING  (TRC_SCHED_MIN + 2)
    2.10  #define TRC_SCHED_DOM_ADD        (TRC_SCHED_VERBOSE +  1)
    2.11  #define TRC_SCHED_DOM_REM        (TRC_SCHED_VERBOSE +  2)
    2.12  #define TRC_SCHED_SLEEP          (TRC_SCHED_VERBOSE +  3)