Messages in this thread | | | Date | Tue, 12 Apr 2005 08:42:53 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] sched: unlocked context-switches |
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* David Mosberger <davidm@napali.hpl.hp.com> wrote:
> Now, Ingo says that the order is reversed with his patch, i.e., > switch_mm() happens after switch_to(). That means flush_tlb_mm() may > now see a current->active_mm which hasn't really been activated yet. > That should be OK since it would just mean that we'd do an early (and > duplicate) activate_context(). While it does not give me a warm and > fuzzy feeling to have this inconsistent state be observable by > interrupt-handlers (and, in particular, IPI-handlers), I don't see any > problem with it off hand.
thanks for the analysis. I fundamentally dont have any fuzzy feeling from having _any_ portion of the context-switch path nonatomic, but with more complex hardware it's just not possible it seems.
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