| Re: [PATCH 7/7] event: add tracepoint for accounting block time [message #44264 is a reply to message #44261] |
Mon, 28 November 2011 11:42   |
Peter Zijlstra
Messages: 61
Registered: September 2006
|
Member |
|
|
On Mon, 2011-11-28 at 12:03 +0300, Andrew Vagin wrote:
> This tracepoint shows how long a task is sleeping in uninterruptible state.
>
> E.g.
> It may show how long and where a mutex is waited.
Fair enough, makes one wonder how much it would take to make
account_scheduler_latency() go away..
> Signed-off-by: Andrew Vagin <avagin@openvz.org>
> ---
> include/trace/events/sched.h | 7 +++++++
> kernel/sched_fair.c | 2 ++
> 2 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> index 959ff18..be077cf 100644
> --- a/include/trace/events/sched.h
> +++ b/include/trace/events/sched.h
> @@ -331,6 +331,13 @@ DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
> TP_ARGS(tsk, delay));
>
> /*
> + * Tracepoint for accounting block time (time the task is in uninterruptible).
> + */
> +DEFINE_EVENT(sched_stat_template, sched_stat_block,
> + TP_PROTO(struct task_struct *tsk, u64 delay),
> + TP_ARGS(tsk, delay));
> +
> +/*
> * Tracepoint for accounting runtime (time the task is executing
> * on a CPU).
> */
> diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
> index 5c9e679..0d7b156 100644
> --- a/kernel/sched_fair.c
> +++ b/kernel/sched_fair.c
> @@ -907,6 +907,8 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
> trace_sched_stat_iowait(tsk, delta);
> }
>
> + trace_sched_stat_block(tsk, delta);
> +
> /*
> * Blocking time is in units of nanosecs, so shift by
> * 20 to get a milliseconds-range estimation of the
|
|
|
|
OpenVZ Forum
Members
Search
Help
Register
Login
Home
