Cc: Sven Wegener <sven.wegener@...>, Linus Torvalds <torvalds@...>, Zhang, Yanmin <yanmin_zhang@...>, Andi Kleen <andi@...>, LKML <linux-kernel@...>, Alexander Viro <viro@...>, Andrew Morton <akpm@...>, Thomas Gleixner <tglx@...>, H. Peter Anvin <hpa@...>
On Sun, May 11, 2008 at 04:32:27PM +0200, Ingo Molnar wrote:
That's a different issue. The AIM7 regression is to do with whether a
task that is currently running and hits a semaphore that has no current
holder but someone else waiting should be allowed to jump the queue.
No argument there; performance trumps theoretical fairness.
This issue is whether multiple sleepers should be woken up all-at-once
or one-at-a-time. Here, you seem to be arguing for theoretical fairness
to trump performance.
(Let's be quite clear; this issue affects *only* multiple
sleepers and multiple wakes given to those sleepers. ie
semaphores-being-used-as-completions and true counting semaphores).
--
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
--
