Re: Calling current() from interrupt context

From: Ralf Baechle (
Date: Mon Oct 09 2000 - 06:30:02 EST

On Sun, Oct 08, 2000 at 04:19:01PM -0700, Mitchell Blank Jr wrote:

> Some do (look at asm-sparc/smp.h). However, linux does everything possible
> to make dereferencing "current" as fast as possible, so actually just
> looping it up there is pretty damn efficient. We need to keep track of the
> last cpu a processor ran on anyway to do cpu-affinity heuristics in the
> scheduler. So this implementation is quite optimal, actually.

Actually it doesn't. We've mostly optimized for code size but not really
for performance. The effects of the same members of a task_struct being
mapped to the same cacheline can be clearly demonstrated in benchmarks.

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