Re: [RFC PATCH 5/6] sched: Remove needless round trip nsecs <-> tick conversion of steal time

From: Rik van Riel
Date: Thu Mar 06 2014 - 14:41:45 EST


On 03/06/2014 12:56 PM, Frederic Weisbecker wrote:
When update_rq_clock_task() accounts the pending steal time for a task,
it converts the steal delta from nsecs to tick then from tick to nsecs.

There is no apparent good reason for doing that though because both
the task clock and the prev steal delta are u64 and store values
in nsecs.

So lets remove the needless conversion.

Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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