The patch titled
Subject: mm: make try_to_munlock() return void
has been added to the -mm tree. Its filename is
mm-make-the-try_to_munlock-void-function.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-make-the-try_to_munlock-void-function.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-make-the-try_to_munlock-void-function.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: mm: make try_to_munlock() return void
try_to_munlock returns SWAP_MLOCK if the one of VMAs mapped the page has
VM_LOCKED flag. In that time, VM set PG_mlocked to the page if the page
is not pte-mapped THP which cannot be mlocked, either.
With that, __munlock_isolated_page can use PageMlocked to check whether
try_to_munlock is successful or not without relying on try_to_munlock's
retval. It helps to make try_to_unmap/try_to_unmap_one simple with
upcoming patches.
Link: http://lkml.kernel.org/r/1489555493-14659-5-git-send-email-minchan@xxxxxxxxxx
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/rmap.h | 2 +-
mm/mlock.c | 6 ++----
mm/rmap.c | 17 +++++------------
3 files changed, 8 insertions(+), 17 deletions(-)
diff -puN include/linux/rmap.h~mm-make-the-try_to_munlock-void-function include/linux/rmap.h
--- a/include/linux/rmap.h~mm-make-the-try_to_munlock-void-function
+++ a/include/linux/rmap.h
@@ -235,7 +235,7 @@ int page_mkclean(struct page *);
* called in munlock()/munmap() path to check for other vmas holding
* the page mlocked.
*/
-int try_to_munlock(struct page *);
+void try_to_munlock(struct page *);
void remove_migration_ptes(struct page *old, struct page *new, bool locked);
diff -puN mm/mlock.c~mm-make-the-try_to_munlock-void-function mm/mlock.c
--- a/mm/mlock.c~mm-make-the-try_to_munlock-void-function
+++ a/mm/mlock.c
@@ -123,17 +123,15 @@ static bool __munlock_isolate_lru_page(s
*/
static void __munlock_isolated_page(struct page *page)
{
- int ret = SWAP_AGAIN;
-
/*
* Optimization: if the page was mapped just once, that's our mapping
* and we don't need to check all the other vmas.
*/
if (page_mapcount(page) > 1)
- ret = try_to_munlock(page);
+ try_to_munlock(page);
/* Did try_to_unlock() succeed or punt? */
- if (ret != SWAP_MLOCK)
+ if (!PageMlocked(page))
count_vm_event(UNEVICTABLE_PGMUNLOCKED);
putback_lru_page(page);
diff -puN mm/rmap.c~mm-make-the-try_to_munlock-void-function mm/rmap.c
--- a/mm/rmap.c~mm-make-the-try_to_munlock-void-function
+++ a/mm/rmap.c
@@ -1552,18 +1552,10 @@ static int page_not_mapped(struct page *
* Called from munlock code. Checks all of the VMAs mapping the page
* to make sure nobody else has this page mlocked. The page will be
* returned with PG_mlocked cleared if no other vmas have it mlocked.
- *
- * Return values are:
- *
- * SWAP_AGAIN - no vma is holding page mlocked, or,
- * SWAP_AGAIN - page mapped in mlocked vma -- couldn't acquire mmap sem
- * SWAP_FAIL - page cannot be located at present
- * SWAP_MLOCK - page is now mlocked.
*/
-int try_to_munlock(struct page *page)
-{
- int ret;
+void try_to_munlock(struct page *page)
+{
struct rmap_walk_control rwc = {
.rmap_one = try_to_unmap_one,
.arg = (void *)TTU_MUNLOCK,
@@ -1573,9 +1565,10 @@ int try_to_munlock(struct page *page)
};
VM_BUG_ON_PAGE(!PageLocked(page) || PageLRU(page), page);
+ VM_BUG_ON_PAGE(PageMlocked(page), page);
+ VM_BUG_ON_PAGE(PageCompound(page) && PageDoubleMap(page), page);
- ret = rmap_walk(page, &rwc);
- return ret;
+ rmap_walk(page, &rwc);
}
void __put_anon_vma(struct anon_vma *anon_vma)
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
mm-reclaim-madv_free-pages-fix.patch
mm-fix-lazyfree-bug-on-check-in-try_to_unmap_one.patch
mm-fix-lazyfree-bug-on-check-in-try_to_unmap_one-fix.patch
mm-do-not-use-double-negation-for-testing-page-flags.patch
mm-remove-unncessary-ret-in-page_referenced.patch
mm-remove-swap_dirty-in-ttu.patch
mm-remove-swap_mlock-check-for-swap_success-in-ttu.patch
mm-make-the-try_to_munlock-void-function.patch
mm-remove-swap_mlock-in-ttu.patch
mm-remove-swap_again-in-ttu.patch
mm-make-ttus-return-boolean.patch
mm-make-rmap_walk-void-function.patch
mm-make-rmap_one-boolean-function.patch
mm-remove-swap_.patch
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