From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f72.google.com (mail-pg0-f72.google.com [74.125.83.72]) by kanga.kvack.org (Postfix) with ESMTP id A79846B0388 for ; Wed, 15 Mar 2017 01:24:59 -0400 (EDT) Received: by mail-pg0-f72.google.com with SMTP id 190so14859308pgg.3 for ; Tue, 14 Mar 2017 22:24:59 -0700 (PDT) Received: from lgeamrelo11.lge.com (LGEAMRELO11.lge.com. [156.147.23.51]) by mx.google.com with ESMTP id c64si701541pfl.21.2017.03.14.22.24.58 for ; Tue, 14 Mar 2017 22:24:58 -0700 (PDT) From: Minchan Kim Subject: [PATCH v2 02/10] mm: remove SWAP_DIRTY in ttu Date: Wed, 15 Mar 2017 14:24:45 +0900 Message-ID: <1489555493-14659-3-git-send-email-minchan@kernel.org> In-Reply-To: <1489555493-14659-1-git-send-email-minchan@kernel.org> References: <1489555493-14659-1-git-send-email-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel-team@lge.com, Johannes Weiner , Michal Hocko , "Kirill A. Shutemov" , Anshuman Khandual , Minchan Kim , Hillf Danton If we found lazyfree page is dirty, try_to_unmap_one can just SetPageSwapBakced in there like PG_mlocked page and just return with SWAP_FAIL which is very natural because the page is not swappable right now so that vmscan can activate it. There is no point to introduce new return value SWAP_DIRTY in try_to_unmap at the moment. Acked-by: Hillf Danton Acked-by: Kirill A. Shutemov Signed-off-by: Minchan Kim --- include/linux/rmap.h | 1 - mm/rmap.c | 4 ++-- mm/vmscan.c | 3 --- 3 files changed, 2 insertions(+), 6 deletions(-) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index fee10d7..b556eef 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -298,6 +298,5 @@ static inline int page_mkclean(struct page *page) #define SWAP_AGAIN 1 #define SWAP_FAIL 2 #define SWAP_MLOCK 3 -#define SWAP_DIRTY 4 #endif /* _LINUX_RMAP_H */ diff --git a/mm/rmap.c b/mm/rmap.c index 9dbfa6f..e692cb5 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1431,7 +1431,8 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * discarded. Remap the page to page table. */ set_pte_at(mm, address, pvmw.pte, pteval); - ret = SWAP_DIRTY; + SetPageSwapBacked(page); + ret = SWAP_FAIL; page_vma_mapped_walk_done(&pvmw); break; } @@ -1501,7 +1502,6 @@ static int page_mapcount_is_zero(struct page *page) * SWAP_AGAIN - we missed a mapping, try again later * SWAP_FAIL - the page is unswappable * SWAP_MLOCK - page is mlocked. - * SWAP_DIRTY - page is dirty MADV_FREE page */ int try_to_unmap(struct page *page, enum ttu_flags flags) { diff --git a/mm/vmscan.c b/mm/vmscan.c index a3656f9..b8fd656 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1142,9 +1142,6 @@ static unsigned long shrink_page_list(struct list_head *page_list, if (page_mapped(page)) { switch (ret = try_to_unmap(page, ttu_flags | TTU_BATCH_FLUSH)) { - case SWAP_DIRTY: - SetPageSwapBacked(page); - /* fall through */ case SWAP_FAIL: nr_unmap_fail++; goto activate_locked; -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org