* Eric W. Biederman <[email protected]> wrote: > > Thinking about it, I don't know if there are calls to schedule() > > while switching from tty1 to tty2. Alt-F2 had no effect anymore, and > > "chvt 2" simply blocked. It would have been possible that a > > schedule() call somewhere got starved due to the load, I don't know. > > It looks like there is a call to schedule_work. so this goes over keventd, right? > There are two pieces of the path. If you are switching in and out of a > tty controlled by something like X. User space has to grant > permission before the operation happens. Where there isn't a gate > keeper I know it is cheaper but I don't know by how much, I suspect > there is still a schedule happening in there. Could keventd perhaps be starved? Willy, to exclude this possibility, could you perhaps chrt keventd to RT priority? If events/0 is PID 5 then the command to set it to SCHED_FIFO:50 would be: chrt -f -p 50 5 but ... events/0 is reniced to -5 by default, so it should definitely not be starved. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- Follow-Ups:
- References:
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Ingo Molnar <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Willy Tarreau <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Willy Tarreau <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Ingo Molnar <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Willy Tarreau <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Willy Tarreau <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Ingo Molnar <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: [email protected] (Eric W. Biederman)
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: Willy Tarreau <[email protected]>
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- From: [email protected] (Eric W. Biederman)
- Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Prev by Date: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Next by Date: Re: [PATCH 3/3] make kthread_stop() scalable
- Previous by thread: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Next by thread: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
- Index(es):
 |