From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Date: Wed, 17 May 2017 11:47:00 -0400
> The ftrace function_graph time measurements of a given function is not
> accurate according to those recorded by ftrace using the function
> filters. This change pulls the x86_64 fix from 'commit 722b3c746953
> ("ftrace/graph: Trace function entry before updating index")' into the
> sparc specific prepare_ftrace_return which stops ftrace from
> counting interrupted tasks in the time measurement.
>
> Example measurements for select_task_rq_fair running "hackbench 100
> process 1000":
>
> | tracing/trace_stat/function0 | function_graph
> Before patch | 2.802 us | 4.255 us
> After patch | 2.749 us | 3.094 us
>
> Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Applied, thanks.
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