Russell King <[email protected]> wrote: > On Sat, Dec 17, 2005 at 12:01:27AM +1100, Nick Piggin wrote: >> You were proposing a worse default, which is the reason I suggested >> it. > > I'd like to qualify that. "for architectures with native cmpxchg". > > For general consumption (not specifically related to mutex stuff)... > > For architectures with llsc, sequences stuch as: > > load > modify > cmpxchg > > are inefficient because they have to be implemented as: > > load > modify > load > compare > store conditional > I dont know what arch u have in mind but for ppc it is: load-reserve modify store-conditional and NOT the sequence you show. -- Linh Dang - 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/
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