On Fri, Jan 17, 2014 at 04:12:06PM -0500, [email protected] wrote:
> From: Rik van Riel <[email protected]>
>
> Being able to see how the active nodemask changes over time, and why,
> can be quite useful.
>
> Cc: Peter Zijlstra <[email protected]>
> Cc: Mel Gorman <[email protected]>
> Cc: Ingo Molnar <[email protected]>
> Cc: Chegu Vinod <[email protected]>
> Signed-off-by: Rik van Riel <[email protected]>
> ---
> include/trace/events/sched.h | 34 ++++++++++++++++++++++++++++++++++
> kernel/sched/fair.c | 8 ++++++--
> 2 files changed, 40 insertions(+), 2 deletions(-)
>
> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> index 67e1bbf..91726b6 100644
> --- a/include/trace/events/sched.h
> +++ b/include/trace/events/sched.h
> @@ -530,6 +530,40 @@ TRACE_EVENT(sched_swap_numa,
> __entry->dst_pid, __entry->dst_tgid, __entry->dst_ngid,
> __entry->dst_cpu, __entry->dst_nid)
> );
> +
> +TRACE_EVENT(update_numa_active_nodes_mask,
Please stick to the sched_ naming for these things.
Ideally we'd rename the sysctls too :/
> +++ b/kernel/sched/fair.c
> @@ -1300,10 +1300,14 @@ static void update_numa_active_node_mask(struct
> task_struct *p)
> faults = numa_group->faults_from[task_faults_idx(nid, 0)] +
> numa_group->faults_from[task_faults_idx(nid, 1)];
> if (!node_isset(nid, numa_group->active_nodes)) {
> - if (faults > max_faults * 4 / 10)
> + if (faults > max_faults * 4 / 10) {
> +
> trace_update_numa_active_nodes_mask(current->pid, numa_group->gid, nid, true,
> faults, max_faults);
While I think the tracepoint hookery is smart enough to avoid evaluating
arguments when they're disabled, it might be best to simply pass:
current and numa_group and do the dereference in fast_assign().
That said, this is the first and only numa tracepoint, I'm not sure why
this qualifies and other metrics do not.
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