Messages in this thread | | | Date | Fri, 11 Jan 2002 01:38:51 +0100 (CET) | From | Ingo Molnar <> | Subject | [patch] O(1) scheduler, -H5 |
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the -H5 patch adds a debugging check:
http://redhat.com/~mingo/O(1)-scheduler/sched-O1-2.5.2-pre11-H5.patch
it adds code to catch places that call schedule() from global-cli() sections. Right now release_kernel_lock() doesnt automatically release the IRQ lock if there is no kernel lock held. A fair amount of code does this still, and i think we should fix them in 2.5.
(Such code, while of questionable quality, is safe if it also holds the big kernel lock, but it's definitely SMP-unsafe it doesnt hold the bkl - the BUG() assert only catches the later case.)
(Andi Kleen noticed this on the first day the patch was released, and Andrew Morton reminded me today that i forgot to fix it ... :-| )
my systems do not trigger the BUG(), so there cannot be all that much broken code left.
Ingo
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