Messages in this thread | | | Subject | Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation | From | "Linh Dang" <> | Date | Fri, 16 Dec 2005 08:46:44 -0500 |
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Russell King <rmk+lkml@arm.linux.org.uk> 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 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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