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 -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
