Messages in this thread | | | Date | Sat, 9 Apr 2005 09:07:38 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] sched: unlocked context-switches |
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* David Mosberger-Tang <David.Mosberger@acm.org> wrote:
> > The ia64_switch_to() code includes a section that can change a > > pinned MMU mapping (when the stack for the new process is in a > > different granule from the stack for the old process). The code > > beyond the ".map" label in arch/ia64/kernel/entry.S includes the > > comment: > > Also, there was a nasty dead-lock that could trigger if the > context-switch was interrupted by a TLB flush IPI. I don't remember > the details offhand, but I'm pretty sure it had to do with > switch_mm(), so I suspect it may not be enough to disable irqs just > for ia64_switch_to(). Tread with care!
we'll see. The patch certainly needs more testing. Generally we do switch_mm()'s outside of the scheduler as well, without disabling interrupts.
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