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Subject[PATCH 1/5] mm: differentiate unmap for vmscan from other unmap.
Date
From: Jérôme Glisse <jglisse@redhat.com>

New code will need to be able to differentiate between a regular unmap and
an unmap trigger by vmscan in which case we want to be as quick as possible.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
---
include/linux/rmap.h | 15 ++++++++-------
mm/memory-failure.c | 2 +-
mm/vmscan.c | 4 ++--
3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index be57450..eddbc07 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -72,13 +72,14 @@ struct anon_vma_chain {
};

enum ttu_flags {
- TTU_UNMAP = 1, /* unmap mode */
- TTU_MIGRATION = 2, /* migration mode */
- TTU_MUNLOCK = 4, /* munlock mode */
-
- TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */
- TTU_IGNORE_ACCESS = (1 << 9), /* don't age */
- TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */
+ TTU_VMSCAN = 1, /* unmap for vmscan */
+ TTU_POISON = 2, /* unmap for poison */
+ TTU_MIGRATION = 4, /* migration mode */
+ TTU_MUNLOCK = 8, /* munlock mode */
+
+ TTU_IGNORE_MLOCK = (1 << 9), /* ignore mlock */
+ TTU_IGNORE_ACCESS = (1 << 10), /* don't age */
+ TTU_IGNORE_HWPOISON = (1 << 11),/* corrupted page is recoverable */
};

#ifdef CONFIG_MMU
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6f57250..11811fb 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -887,7 +887,7 @@ static int page_action(struct page_state *ps, struct page *p,
static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
int trapno, int flags, struct page **hpagep)
{
- enum ttu_flags ttu = TTU_UNMAP | TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS;
+ enum ttu_flags ttu = TTU_POISON | TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS;
struct address_space *mapping;
LIST_HEAD(tokill);
int ret;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d47f8aa..3b3137b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1161,7 +1161,7 @@ unsigned long reclaim_clean_pages_from_list(struct zone *zone,
}

ret = shrink_page_list(&clean_pages, zone, &sc,
- TTU_UNMAP|TTU_IGNORE_ACCESS,
+ TTU_VMSCAN|TTU_IGNORE_ACCESS,
&dummy1, &dummy2, &dummy3, &dummy4, &dummy5, true);
list_splice(&clean_pages, page_list);
mod_zone_page_state(zone, NR_ISOLATED_FILE, -ret);
@@ -1514,7 +1514,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
if (nr_taken == 0)
return 0;

- nr_reclaimed = shrink_page_list(&page_list, zone, sc, TTU_UNMAP,
+ nr_reclaimed = shrink_page_list(&page_list, zone, sc, TTU_VMSCAN,
&nr_dirty, &nr_unqueued_dirty, &nr_congested,
&nr_writeback, &nr_immediate,
false);
--
1.9.0
--
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