vm_privilege for swapin thread
Memory allocation is suspended when free memory is low in a memory
segment. I observed a number of occasions during recent stress testing
when the kernel effectively froze because a different thread could not
be swapped in. The swapin thread was suspended awaiting memory for stack
allocation.
I didn't think it was unreasonable to promote the swapin_thread to
having vm_privilege to help overcome those situations but perhaps there
is a reason not to?
Mike.
diff --git a/kern/thread_swap.c b/kern/thread_swap.c
index bfb39239..7bf734f8 100644
--- a/kern/thread_swap.c
+++ b/kern/thread_swap.c
@@ -193,6 +193,7 @@ static void __attribute__((noreturn))
swapin_thread_continue(void)
void swapin_thread(void)
{
+ current_thread()->vm_privilege = 1;
stack_privilege(current_thread());
swapin_thread_continue();
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