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[PATCH] temporarily disable swap token on memory pressure

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Some users (hi Zwane) have seen a problem when running a workload that
eats nearly all of physical memory - th system does an OOM kill, even
when there is still a lot of swap free.

The problem appears to be a very big task that is holding the swap
token, and the VM has a very hard time finding any other page in the
system that is swappable.

Instead of ignoring the swap token when sc->priority reaches 0, we could
simply take the swap token away from the memory hog and make sure we
don't give it back to the memory hog for a few seconds.

This patch resolves the problem Zwane ran into.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rik van Riel
2005-11-28 13:44:07 -08:00
committed by Linus Torvalds
parent a93a117eaa
commit f7b7fd8f3e
5 changed files with 34 additions and 23 deletions
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11
mm/vmscan.c
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@@ -407,7 +407,7 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
if (PageWriteback(page))
goto keep_locked;
referenced = page_referenced(page, 1, sc->priority <= 0);
referenced = page_referenced(page, 1);
/* In active use or really unfreeable? Activate it. */
if (referenced && page_mapping_inuse(page))
goto activate_locked;
@@ -756,7 +756,7 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc)
if (page_mapped(page)) {
if (!reclaim_mapped ||
(total_swap_pages == 0 && PageAnon(page)) ||
page_referenced(page, 0, sc->priority <= 0)) {
page_referenced(page, 0)) {
list_add(&page->lru, &l_active);
continue;
}
@@ -960,6 +960,8 @@ int try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
sc.nr_reclaimed = 0;
sc.priority = priority;
sc.swap_cluster_max = SWAP_CLUSTER_MAX;
if (!priority)
disable_swap_token();
shrink_caches(zones, &sc);
shrink_slab(sc.nr_scanned, gfp_mask, lru_pages);
if (reclaim_state) {
@@ -1056,6 +1058,10 @@ loop_again:
int end_zone = 0; /* Inclusive. 0 = ZONE_DMA */
unsigned long lru_pages = 0;
/* The swap token gets in the way of swapout... */
if (!priority)
disable_swap_token();
all_zones_ok = 1;
if (nr_pages == 0) {
@@ -1360,6 +1366,7 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
sc.nr_reclaimed = 0;
/* scan at the highest priority */
sc.priority = 0;
disable_swap_token();
if (nr_pages > SWAP_CLUSTER_MAX)
sc.swap_cluster_max = nr_pages;