Andi Kleen wrote on Thursday, December 07, 2006 6:28 PM
> "Chen, Kenneth W" <[email protected]> writes:
> > I tried to use cache_line_size() to find out the alignment of struct bio, but
> > stumbled on that it is a runtime function for x86_64.
>
> It's a single global variable access:
>
> #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
>
> Or do you mean it caused cache misses? boot_cpu_data is cache aligned
> and practically read only, so there shouldn't be any false sharing at least.
No, I was looking for a generic constant that describes cache line size.
I needed a constant in order to avoid runtime check and to rely on compiler
to optimize a conditional check away.
-
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/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
