On Mon, Mar 10, 2003 at 04:07:36AM +0100, Linus Torvalds wrote:
> since you've been interested in the past, I thought I'd ask you to test
> the current context switch stuff. Andi cleaned up some FPU reload stuff
> (and I fixed a bug in it, tssk tssk Andi - you'd obviously not actually
> timed your cleanups), and I just committed and pushed out my "cache the
You mean the TIF->_TIF thing? Yes that was wrong in the first patch,
but fixed in the patches later. Unfortunately the patch still
has the problem pointed out by Manfred Spraul: if you're unlucky
it could destroy the _TIF_SIGPENDING set by another CPU with the
non atomic access. Really thread_info should have two flag words:
one that is truly local and can be accessed without LOCK and
one that can be changed at will by external users too.
After some discussion with him I think the right fix for now is to
move it it back to PF_USEDFPU into task_struct->flags.
Will submit a patch for that later after I was able to test it.
-Andi
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This archive was generated by hypermail 2b29 : Sat Mar 15 2003 - 22:00:21 EST