[lkml]   [2006]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [patch] speed up single bio_vec allocation
Andi Kleen wrote on Thursday, December 07, 2006 6:28 PM
> "Chen, Kenneth W" <> 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
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-12-08 05:25    [W:0.055 / U:1.864 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site