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Date: Sun, 29 Jan 2017 21:51:21 -0800
From: Shaohua Li <shli@...com>
To: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
CC: <Kernel-team@...com>, <mhocko@...e.com>, <minchan@...nel.org>,
<hughd@...gle.com>, <hannes@...xchg.org>, <riel@...hat.com>,
<mgorman@...hsingularity.net>
Subject: [RFC 4/6] mm: move MADV_FREE pages into LRU_LAZYFREE list
Move the MADV_FREE pages into LRU_LAZYFREE list. The reason why we need
to do this is described in last patch. Next patch will reclaim the
pages.
The patch is based on Minchan's previous patch.
Cc: Michal Hocko <mhocko@...e.com>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Signed-off-by: Shaohua Li <shli@...com>
---
include/linux/swap.h | 2 +-
mm/huge_memory.c | 5 ++---
mm/madvise.c | 3 +--
mm/swap.c | 51 +++++++++++++++++++++++++++++----------------------
4 files changed, 33 insertions(+), 28 deletions(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 45e91dd..e35bef5 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -279,7 +279,7 @@ extern void lru_add_drain_cpu(int cpu);
extern void lru_add_drain_all(void);
extern void rotate_reclaimable_page(struct page *page);
extern void deactivate_file_page(struct page *page);
-extern void deactivate_page(struct page *page);
+extern void move_page_to_lazyfree_list(struct page *page);
extern void swap_setup(void);
extern void add_page_to_unevictable_list(struct page *page);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index ffa7ed5..57daef7 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1391,9 +1391,6 @@ bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
ClearPageDirty(page);
unlock_page(page);
- if (PageActive(page))
- deactivate_page(page);
-
if (pmd_young(orig_pmd) || pmd_dirty(orig_pmd)) {
orig_pmd = pmdp_huge_get_and_clear_full(tlb->mm, addr, pmd,
tlb->fullmm);
@@ -1404,6 +1401,8 @@ bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
set_pmd_at(mm, addr, pmd, orig_pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
}
+
+ move_page_to_lazyfree_list(page);
ret = true;
out:
spin_unlock(ptl);
diff --git a/mm/madvise.c b/mm/madvise.c
index c867d88..78b4b02 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -378,10 +378,9 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
ptent = pte_mkclean(ptent);
ptent = pte_wrprotect(ptent);
set_pte_at(mm, addr, pte, ptent);
- if (PageActive(page))
- deactivate_page(page);
tlb_remove_tlb_entry(tlb, pte, addr);
}
+ move_page_to_lazyfree_list(page);
}
out:
if (nr_swap) {
diff --git a/mm/swap.c b/mm/swap.c
index c4910f1..f9e70e8 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
@@ -268,6 +268,10 @@ static void __activate_page(struct page *page, struct lruvec *lruvec,
int lru = page_lru_base_type(page);
del_page_from_lru_list(page, lruvec, lru);
+ if (lru == LRU_LAZYFREE) {
+ ClearPageLazyFree(page);
+ lru = LRU_INACTIVE_ANON;
+ }
SetPageActive(page);
lru += LRU_ACTIVE;
add_page_to_lru_list(page, lruvec, lru);
@@ -455,6 +459,8 @@ void add_page_to_unevictable_list(struct page *page)
ClearPageActive(page);
SetPageUnevictable(page);
SetPageLRU(page);
+ if (page_is_lazyfree(page))
+ ClearPageLazyFree(page);
add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE);
spin_unlock_irq(&pgdat->lru_lock);
}
@@ -561,20 +567,21 @@ 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) && PageSwapBacked(page) && !PageLazyFree(page) &&
+ !PageUnevictable(page)) {
+ unsigned int nr_pages = PageTransHuge(page) ? HPAGE_PMD_NR : 1;
+ 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);
+ SetPageLazyFree(page);
+ add_page_to_lru_list(page, lruvec, LRU_LAZYFREE);
- __count_vm_event(PGDEACTIVATE);
- update_page_reclaim_stat(lruvec, file, 0);
+ count_vm_events(PGLAZYFREE, nr_pages);
}
}
@@ -604,9 +611,9 @@ 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);
}
@@ -638,22 +645,22 @@ void deactivate_file_page(struct page *page)
}
/**
- * deactivate_page - deactivate a page
- * @page: page to deactivate
+ * move_page_to_lazyfree_list - move anon page to lazyfree list
+ * @page: page to move
*
- * 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.
+ * This function moves @page to the lazyfree list after the page is the target
+ * of a MADV_FREE syscall. This is to accelerate the reclaim of the @page
*/
-void deactivate_page(struct page *page)
+void move_page_to_lazyfree_list(struct page *page)
{
- if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
- struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs);
+ if (PageLRU(page) && PageSwapBacked(page) && !PageLazyFree(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);
}
}
@@ -704,7 +711,7 @@ 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, lru_add_drain_wq, work);
--
2.9.3
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