Re: rfc/rft: use r10 as current on x86-64

From: Pavel Machek
Date: Wed Nov 23 2005 - 17:50:04 EST


> The patch below converts x86-64 to use r10 as the current pointer instead
> of gs:pcurrent. This results in a ~34KB savings in the code segment of
> the kernel. I've tested this with running a few regular applications,
> plus a few 32 bit binaries. If this patch is interesting, it probably
> makes sense to merge the thread info structure into the task_struct so
> that the assembly bits for syscall entry can be cleaned up. Comments?

34KB smaller is nice, but is not it also 30% slower? Plus some inline
assembly *will* have %r10 hardcoded, no? I'd be afraid around crypto
code, for example.
Thanks, Sharp!
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