Since the 2.1.110, people running SMP Linux systems have noticed this
message occuring from time to time: "stuck on smp_invalidate_needed ...".
After having spent hours on it, I have found the reason of this message
that used to stuck SMP systems for seconds. The problem is very simple:
The code added for SMP rescheduling in "smp_send_reschedule()" calls
"smp_message_pass()" with the 4th argument set to 2, which asks the
processor to wait for invalidate map to clear, which has nothing to do
with rescheduling :-) The attached patch obviously fixes the problem.
Best regards,
-Eric
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ Eric PAIRE
Email : e.paire@gr.opengroup.org | THE Open GROUP - Grenoble Research Institute
Phone : +33 (0) 476 63 48 71 | 2, avenue de Vignate
Fax : +33 (0) 476 51 05 32 | F-38610 Gieres FRANCE
------ Cut Here ------ Cut Here ------ Cut Here ------ Cut Here ------
--- arch/i386/kernel/smp.c.OLD Mon Jul 27 09:38:08 1998
+++ arch/i386/kernel/smp.c Mon Jul 27 16:20:14 1998
@@ -1412,7 +1412,7 @@
__save_flags(flags);
__cli();
- smp_message_pass(cpu, MSG_RESCHEDULE, 0L, 2);
+ smp_message_pass(cpu, MSG_RESCHEDULE, 0L, 0);
__restore_flags(flags);
}
-
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