Re: [PATCH] relayfs redux, part 2

[Andi Kleen <ak@muc.de>]

Tom Zanussi <zanussi@us.ibm.com> writes:

> Hi,
>
> This patch is the result of the latest round of liposuction on relayfs
> - the patch size is now 44K, down from 110K and the 200K before that.
> I'm posting it as a patch against 2.6.10 rather than -mm in order to
> make it easier to review, but will create one for -mm once the changes
> have settled down.

The logging fast path seems still a bit slow to me. I would like
to have a logging macro that is not much worse than a stdio putc,
basically something like

          get_cpu();
          if (buffer space > N) { 
              memcpy(buffer, input, N);
              buffer pointer += N;
          } else { 
              FreeBuffer(input, N); 
          }    
          put_cpu();

This would need interrupt protection only if interrupts can access
it, best you use separate buffers for that too.

-Andi