Hi,
As suggested by Linus, I've cleaned the reapswap code to be contained
inside an inline function. (yes, the if statement is really ugly)
Tested and against 2.4.6pre1.
--- linux.orig/mm/vmscan.c Wed Jun 6 18:16:45 2001
+++ linux/mm/vmscan.c Wed Jun 6 18:28:26 2001
@@ -407,6 +407,27 @@
memory_pressure++;
return page;
}
+/*
+ * Check for dead swap cache pages and clean them, forcing
+ * those pages to be freed earlier.
+ */
+static inline int clean_dead_swap_page (struct page* page)
+{
+ int ret = 0;
+ if (!TryLockPage (page)) {
+ if (PageSwapCache(page) && PageDirty(page) &&
+ (page_count(page) - !!page->buffers) == 1 &&
+ swap_count(page) == 1) {
+ ClearPageDirty(page);
+ ClearPageReferenced(page);
+ page->age = 0;
+ ret = 1;
+ }
+ UnlockPage(page);
+ }
+ return ret;
+}
+
/**
* page_launder - clean dirty inactive pages, move to inactive_clean list
@@ -456,6 +477,12 @@
continue;
}
+ /*
+ * Check for dead swap cache pages
+ * before doing any other checks.
+ */
+ clean_dead_swap_page(page);
+
/* Page is or was in use? Move it to the active list. */
if (PageReferenced(page) || page->age > 0 ||
page->zone->free_pages > page->zone->pages_high ||
@@ -666,6 +693,15 @@
printk("VM: refill_inactive, wrong page on list.\n");
list_del(page_lru);
nr_active_pages--;
+ continue;
+ }
+
+ /*
+ * Special case for dead swap cache pages.
+ */
+ if (clean_dead_swap_page(page)) {
+ deactivate_page_nolock(page);
+ nr_deactivated++;
continue;
}
-
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