| Date | Tue, 27 Aug 2019 00:51:13 +0200 | From | Frederic Weisbecker <> | Subject | Re: [patch V2 34/38] posix-cpu-timers: Get rid of 64bit divisions |
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On Wed, Aug 21, 2019 at 09:09:21PM +0200, Thomas Gleixner wrote: > Instead of dividing A to match the units of B it's more efficient to > multiply B to match the units of A. > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > --- > V2: Fix the dropped update of the expiry cache when the soft limit increased > --- > kernel/time/posix-cpu-timers.c | 24 ++++++++++++++---------- > 1 file changed, 14 insertions(+), 10 deletions(-) > > --- a/kernel/time/posix-cpu-timers.c > +++ b/kernel/time/posix-cpu-timers.c > @@ -798,10 +798,11 @@ static void check_thread_timers(struct t > */ > soft = task_rlimit(tsk, RLIMIT_RTTIME); > if (soft != RLIM_INFINITY) { > + /* Task RT timeout is accounted in jiffies. RTTIME is usec */ > + unsigned long rtim = tsk->rt.timeout * (USEC_PER_SEC / HZ);
jiffies_to_usecs() ?
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
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