Messages in this thread |  | | | Date | Sun, 18 Oct 1998 16:24:52 +0200 (CEST) | | From | Andrea Arcangeli <> | | Subject | Re: [patch] jiffies wraparound [Re: 2.1.125 Show stopper list: Draft] |
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On Sun, 18 Oct 1998, David S. Miller wrote:
> I think that using a bitwise flag (use_timeout) could eventually > also improve performance because when the timeout expire we don' t > need to set to 0 a 64 bit memory area on 64bit arch. I am not 100% > sure though ;-). > >On most RISC machines, bitfield extract/store is implemented as word ^^^^
I guess that there are not asm instruction for bitwise memory accesses. Word means 32 or 64 bit (->timeout is a 64 bit memory area)? I have no cross compier to check the output asm here.
>memory operations with the bit twiddle in the register. This is >actually specified by the ABI, sparc64 and alpha do this for example.
ABI ??
Andrea Arcangeli
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