Re: [PATCH RFC 0/6] Implement per-processor data areas for i386.

Andreas Mohr
2006-08-27T18:23:19Z

Hi,

On Sun, Aug 27, 2006 at 10:34:46AM -0700, Jeremy Fitzhardinge wrote:
> Andreas Mohr wrote:
> >This is interesting, since even by doing a non-elegant
> >current->... --> struct task_struct *tsk = current;
> >replacement for excessive uses of current, I was able to gain almost 10kB
> >within a single file already!
> >I guess it's due to having tried that on an older installation with gcc
> >3.2,
> >which probably does less efficient opcode merging of current_thread_info()
> >requests compared to a current gcc version.
> >IOW, .text segment reduction could be quite a bit higher for older gcc:s.
> >
>
> That doesn't sound likely. current_thread_info() is only about 2
> instructions. Are you looking at the .text segment size, or the actual
> file size? The latter can be very misleading in the presence of debug info.

Got me. File size only. And that was 10kB of around 170kB, BTW.

Andreas Mohr