Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [Lse-tech] Re: [PATCH for 2.5] preemptible kernel | Date | Wed, 11 Apr 2001 01:21:43 +1000 |
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In message <OF42269F5F.CDF56B0F-ON88256A27.0083566F@LocalDomain> you write: > > Already preempted tasks. > > But if you are suppressing preemption in all read-side critical sections, > then wouldn't any already-preempted tasks be guaranteed to -not- be in > a read-side critical section, and therefore be guaranteed to be unaffected > by the update (in other words, wouldn't such tasks not need to be waited > for)?
Ah, if you want to inc and dec all the time, yes. But even if the performance isn't hurt, it's unneccessary, and something else people have to remember to do.
Simplicity is very nice. And in the case of module unload, gives us the ability to avoid the distinction between "am I calling into a module?" and "is this fixed in the kernel?" at runtime. A very good thing 8)
Rusty. -- Premature optmztion is rt of all evl. --DK - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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