Messages in this thread | | | Date | Wed, 8 Sep 2010 16:28:26 +0200 | From | Jan Blunck <> | Subject | Re: [RFC 3/4] Disable scheduler tick when we are running SCHED_FIFO tasks |
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On Wed, Sep 08, Peter Zijlstra wrote:
> On Wed, 2010-09-08 at 14:29 +0200, Jan Blunck wrote: > > This patch is disabling the scheduler tick to go off when there is a task > > with SCHED_FIFO policy running. Since these tasks are not timesliced anyway > > we only care about timers, softirqs and such stuff just like when we disable > > the tick during idle periods. > > > > Also, doesn't this break any and all jiffies users? >
Sure. It was enough to make FTQ run.
> And you need to restart the tick on call_rcu() and everything else that > requires the tick for processing. >
I realized that before as well but somehow forgot about it. Checking for a disabled timer tick on syscall entry would help. Like we do on irq entry as well.
Jan
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