lkml.org 
[lkml]   [2007]   [Nov]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC] Documentation about unaligned memory access
From
Date

> Sidenote: in the above example, you may wish to reorder the fields in the
> above structure so that the overall structure uses less memory. For example,
> moving field3 to sit inbetween field1 and field2 (where the padding is
> inserted) would shrink the overall structure by 1 byte:
>
> struct foo {
> u16 field1;
> u8 field3;
> u32 field2;
> };

You can reorder to u32, u16, u8 order and save another byte :)

A reference to pahole could be appropriate here, and probably a small
note that some large existing structures like netdev have deliberate
holes to achieve cache alignment.

johannes
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2007-11-26 16:51    [W:1.054 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site