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remove whole-process swapping
Long before Unix supported paging, it used process swapping to reclaim
memory. The code is there and in theory it runs when we get *extremely* low
on memory. In practice, it never runs since the definition of low-on-memory
is antiquated. (XXX: define what antiquated means)
You can check the number of swapout/swapin events with kstats:
$ kstat -p ::vm:swapin ::vm:swapout
@@ -4320,18 +4320,10 @@
if (t->t_stkbase == NULL)
return (WALK_NEXT);
/*
- * Warn about swapped out threads, but drive on anyway
- */
- if (!(t->t_schedflag & TS_LOAD)) {
- mdb_warn("thread %p's stack swapped out\n", addr);
- return (WALK_NEXT);
- }
-
- /*
* Search the thread's stack for the given pointer. Note that it would
* be more efficient to follow ::kgrep's lead and read in page-sized
* chunks, but this routine is already fast and simple.
*/
for (current = (uintptr_t)t->t_stkbase; current < (uintptr_t)t->t_stk;