>Right: 2.1.131 + Rik's fixes + my fix to Rik's fixes (see below) has set
>a new record for my 8MB benchmarks. In 64MB, it is behaving much more
I think that my state = 0 in do_try_to_free_page() helped a lot to handle
the better kernel performance.
>--- mm/vmscan.c.~1~ Mon Dec 7 12:05:54 1998
>+++ mm/vmscan.c Mon Dec 7 18:55:55 1998
>@@ -432,6 +432,8 @@
>
> if (buffer_over_borrow() || pgcache_over_borrow())
> state = 0;
>+ if (atomic_read(&nr_async_pages) > pager_daemon.swap_cluster / 2)
>+ shrink_mmap(i, gfp_mask);
>
Doing that we risk to shrink too much cache even if not necessary but this
part of the patch improve a _lot_ swapping performance even if I don' t know
why ;)
And why not to use GFP_USER in the userspace swaping code?
Index: linux/mm/swap_state.c
diff -u linux/mm/swap_state.c:1.1.3.2 linux/mm/swap_state.c:1.1.1.1.2.4
--- linux/mm/swap_state.c:1.1.3.2 Wed Dec 9 16:11:46 1998
+++ linux/mm/swap_state.c Wed Dec 9 18:39:03 1998
@@ -261,7 +261,9 @@
struct page * lookup_swap_cache(unsigned long entry)
{
struct page *found;
+#ifdef SWAP_CACHE_INFO
swap_cache_find_total++;
+#endif
while (1) {
found = find_page(&swapper_inode, entry);
@@ -270,7 +272,9 @@
if (found->inode != &swapper_inode || !PageSwapCache(found))
goto out_bad;
if (!PageLocked(found)) {
+#ifdef SWAP_CACHE_INFO
swap_cache_find_success++;
+#endif
return found;
}
__free_page(found);
@@ -308,7 +336,7 @@
if (found_page)
goto out;
- new_page_addr = __get_free_page(GFP_KERNEL);
+ new_page_addr = __get_free_page(GFP_USER);
if (!new_page_addr)
goto out; /* Out of memory */
new_page = mem_map + MAP_NR(new_page_addr);
Andrea Arcangeli
-
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