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SubjectRe: [PATCH] ftrace: add tracing_thresh to function profile
On Mon, 22 Jun 2015 16:58:08 +0530
Umesh Tiwari <umesh.t@samsung.com> wrote:

> From: Himanshu Maithani <himanshu.m@samsung.com>
>
> This patch extends tracing_thresh functionality to function profile tracer.
> If tracing_thresh is set, print those entries only,
> whose average is > tracing thresh.
>

This should also have a Signed-off-by from Himanshu Miathani. If
possible.

-- Steve

> Signed-off-by: Umesh Tiwari <umesh.t@samsung.com>
> ---
> kernel/trace/ftrace.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 4f22802..7a48a67 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -600,13 +600,19 @@ static int function_stat_show(struct seq_file *m, void *v)
> goto out;
> }
>
> + /* moved above to avoid printing values < thresh */
> +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
> + avg = rec->time;
> + do_div(avg, rec->counter);
> + if (tracing_thresh && (avg < tracing_thresh))
> + goto out;
> +#endif
> +
> kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
> seq_printf(m, " %-30.30s %10lu", str, rec->counter);
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> seq_puts(m, " ");
> - avg = rec->time;
> - do_div(avg, rec->counter);
>
> /* Sample standard deviation (s^2) */
> if (rec->counter <= 1)



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