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Subject[RFT][PATCH] even out background aging
[Request For Testers:  please test this on your system...]

Hi,

the following patch makes use of the fact that refill_inactive()
now calls swap_out() before calling refill_inactive_scan() and
the fact that the inactive_dirty list is now reclaimed in a fair
LRU order.

Background scanning can now be replaced by a simple call to
refill_inactive(), instead of the refill_inactive_scan(), which
gave mapped pages an unfair advantage over unmapped ones.

The special-casing of the amount to scan in refill_inactive_scan()
is removed as well, there's absolutely no reason we'd need it with
the current VM balance.

regards,

Rik
--


--- linux-2.4.6-pre3/mm/vmscan.c.orig Thu Jun 14 12:28:03 2001
+++ linux-2.4.6-pre3/mm/vmscan.c Fri Jun 15 11:55:09 2001
@@ -695,13 +695,6 @@
int page_active = 0;
int nr_deactivated = 0;

- /*
- * When we are background aging, we try to increase the page aging
- * information in the system.
- */
- if (!target)
- maxscan = nr_active_pages >> 4;
-
/* Take the lock while messing with the list... */
spin_lock(&pagemap_lru_lock);
while (maxscan-- > 0 && (page_lru = active_list.prev) != &active_list) {
@@ -978,7 +971,7 @@
recalculate_vm_stats();

/* Do background page aging. */
- refill_inactive_scan(DEF_PRIORITY, 0);
+ refill_inactive(GFP_KSWAPD, 0);
}

run_task_queue(&tq_disk);
-
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