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authorShaohua Li <shli@fb.com>2017-05-03 14:52:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:08 -0700
commitf7ad2a6cb9f7c4040004bedee84a70a9b985583e (patch)
tree3f5bd46b2b5e2d5eecb3f2a155e6995fd22a3286 /mm/swap.c
parentd44d363f65780f2ac2ec672164555af54896d40d (diff)
mm: move MADV_FREE pages into LRU_INACTIVE_FILE list
madv()'s MADV_FREE indicate pages are 'lazyfree'. They are still anonymous pages, but they can be freed without pageout. To distinguish these from normal anonymous pages, we clear their SwapBacked flag. MADV_FREE pages could be freed without pageout, so they pretty much like used once file pages. For such pages, we'd like to reclaim them once there is memory pressure. Also it might be unfair reclaiming MADV_FREE pages always before used once file pages and we definitively want to reclaim the pages before other anonymous and file pages. To speed up MADV_FREE pages reclaim, we put the pages into LRU_INACTIVE_FILE list. The rationale is LRU_INACTIVE_FILE list is tiny nowadays and should be full of used once file pages. Reclaiming MADV_FREE pages will not have much interfere of anonymous and active file pages. And the inactive file pages and MADV_FREE pages will be reclaimed according to their age, so we don't reclaim too many MADV_FREE pages too. Putting the MADV_FREE pages into LRU_INACTIVE_FILE_LIST also means we can reclaim the pages without swap support. This idea is suggested by Johannes. This patch doesn't move MADV_FREE pages to LRU_INACTIVE_FILE list yet to avoid bisect failure, next patch will do it. The patch is based on Minchan's original patch. [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/2f87063c1e9354677b7618c647abde77b07561e5.1487965799.git.shli@fb.com Signed-off-by: Shaohua Li <shli@fb.com> Suggested-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Minchan Kim <minchan@kernel.org> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap.c')
-rw-r--r--mm/swap.c49
1 files changed, 28 insertions, 21 deletions
diff --git a/mm/swap.c b/mm/swap.c
index d8d9ee9e311a..98d08b4579fa 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -46,7 +46,7 @@ int page_cluster;
static DEFINE_PER_CPU(struct pagevec, lru_add_pvec);
static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs);
static DEFINE_PER_CPU(struct pagevec, lru_deactivate_file_pvecs);
-static DEFINE_PER_CPU(struct pagevec, lru_deactivate_pvecs);
+static DEFINE_PER_CPU(struct pagevec, lru_lazyfree_pvecs);
#ifdef CONFIG_SMP
static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs);
#endif
@@ -571,20 +571,27 @@ static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec,
}
-static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec,
+static void lru_lazyfree_fn(struct page *page, struct lruvec *lruvec,
void *arg)
{
- if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
- int file = page_is_file_cache(page);
- int lru = page_lru_base_type(page);
+ if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
+ !PageUnevictable(page)) {
+ bool active = PageActive(page);
- del_page_from_lru_list(page, lruvec, lru + LRU_ACTIVE);
+ del_page_from_lru_list(page, lruvec,
+ LRU_INACTIVE_ANON + active);
ClearPageActive(page);
ClearPageReferenced(page);
- add_page_to_lru_list(page, lruvec, lru);
+ /*
+ * lazyfree pages are clean anonymous pages. They have
+ * SwapBacked flag cleared to distinguish normal anonymous
+ * pages
+ */
+ ClearPageSwapBacked(page);
+ add_page_to_lru_list(page, lruvec, LRU_INACTIVE_FILE);
- __count_vm_event(PGDEACTIVATE);
- update_page_reclaim_stat(lruvec, file, 0);
+ __count_vm_events(PGLAZYFREE, hpage_nr_pages(page));
+ update_page_reclaim_stat(lruvec, 1, 0);
}
}
@@ -614,9 +621,9 @@ void lru_add_drain_cpu(int cpu)
if (pagevec_count(pvec))
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL);
- pvec = &per_cpu(lru_deactivate_pvecs, cpu);
+ pvec = &per_cpu(lru_lazyfree_pvecs, cpu);
if (pagevec_count(pvec))
- pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
+ pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
activate_page_drain(cpu);
}
@@ -648,22 +655,22 @@ void deactivate_file_page(struct page *page)
}
/**
- * deactivate_page - deactivate a page
+ * mark_page_lazyfree - make an anon page lazyfree
* @page: page to deactivate
*
- * deactivate_page() moves @page to the inactive list if @page was on the active
- * list and was not an unevictable page. This is done to accelerate the reclaim
- * of @page.
+ * mark_page_lazyfree() moves @page to the inactive file list.
+ * This is done to accelerate the reclaim of @page.
*/
-void deactivate_page(struct page *page)
+void mark_page_lazyfree(struct page *page)
{
- if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
- struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs);
+ if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
+ !PageUnevictable(page)) {
+ struct pagevec *pvec = &get_cpu_var(lru_lazyfree_pvecs);
get_page(page);
if (!pagevec_add(pvec, page) || PageCompound(page))
- pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
- put_cpu_var(lru_deactivate_pvecs);
+ pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
+ put_cpu_var(lru_lazyfree_pvecs);
}
}
@@ -703,7 +710,7 @@ void lru_add_drain_all(void)
if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) ||
pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) ||
pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) ||
- pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) ||
+ pagevec_count(&per_cpu(lru_lazyfree_pvecs, cpu)) ||
need_activate_page_drain(cpu)) {
INIT_WORK(work, lru_add_drain_per_cpu);
queue_work_on(cpu, mm_percpu_wq, work);