From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752341AbdAaN2O (ORCPT ); Tue, 31 Jan 2017 08:28:14 -0500 Received: from smtpbg123.qq.com ([183.60.2.34]:40296 "EHLO smtpbg123.qq.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752502AbdAaN1Y (ORCPT ); Tue, 31 Jan 2017 08:27:24 -0500 X-Greylist: delayed 499 seconds by postgrey-1.27 at vger.kernel.org; Tue, 31 Jan 2017 08:27:23 EST X-QQ-Spam: true X-QQ-mid: esmtp27t1485868109tv7joiq8f X-QQ-SSF: 01000000000000200G110300000000V From: ysxie@foxmail.com To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: n-horiguchi@ah.jp.nec.com, mhocko@suse.com, akpm@linux-foundation.org, minchan@kernel.org, vbabka@suse.cz, mgorman@techsingularity.net, hannes@cmpxchg.org, iamjoonsoo.kim@lge.com, izumi.taku@jp.fujitsu.com, arbab@linux.vnet.ibm.com, vkuznets@redhat.com, ak@linux.intel.com, guohanjun@huawei.com, qiuxishi@huawei.com Subject: [PATCH v5 1/4] mm/migration: make isolate_movable_page() return int type Date: Tue, 31 Jan 2017 21:06:18 +0800 Message-Id: <1485867981-16037-2-git-send-email-ysxie@foxmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1485867981-16037-1-git-send-email-ysxie@foxmail.com> References: <1485867981-16037-1-git-send-email-ysxie@foxmail.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtp:foxmail.com:bgweb:bgweb21 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yisheng Xie This patch changes the return type of isolate_movable_page() from bool to int. It will return 0 when isolate movable page successfully, return -EINVAL when the page is not a non-lru movable page, and for other cases it will return -EBUSY. There is no functional change within this patch but prepare for later patch. Signed-off-by: Yisheng Xie Suggested-by: Michal Hocko Cc: Minchan Kim Cc: Naoya Horiguchi CC: Vlastimil Babka --- include/linux/migrate.h | 2 +- mm/compaction.c | 2 +- mm/migrate.c | 11 +++++++---- 3 files changed, 9 insertions(+), 6 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index ae8d475..43d5deb 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -37,7 +37,7 @@ extern int migrate_page(struct address_space *, struct page *, struct page *, enum migrate_mode); extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, unsigned long private, enum migrate_mode mode, int reason); -extern bool isolate_movable_page(struct page *page, isolate_mode_t mode); +extern int isolate_movable_page(struct page *page, isolate_mode_t mode); extern void putback_movable_page(struct page *page); extern int migrate_prep(void); diff --git a/mm/compaction.c b/mm/compaction.c index 949198d..1d89147 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -802,7 +802,7 @@ static bool too_many_isolated(struct zone *zone) locked = false; } - if (isolate_movable_page(page, isolate_mode)) + if (!isolate_movable_page(page, isolate_mode)) goto isolate_success; } diff --git a/mm/migrate.c b/mm/migrate.c index 87f4d0f..bbbd170 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -74,8 +74,9 @@ int migrate_prep_local(void) return 0; } -bool isolate_movable_page(struct page *page, isolate_mode_t mode) +int isolate_movable_page(struct page *page, isolate_mode_t mode) { + int ret = -EBUSY; struct address_space *mapping; /* @@ -95,8 +96,10 @@ bool isolate_movable_page(struct page *page, isolate_mode_t mode) * assumes anybody doesn't touch PG_lock of newly allocated page * so unconditionally grapping the lock ruins page's owner side. */ - if (unlikely(!__PageMovable(page))) + if (unlikely(!__PageMovable(page))) { + ret = -EINVAL; goto out_putpage; + } /* * As movable pages are not isolated from LRU lists, concurrent * compaction threads can race against page migration functions @@ -125,14 +128,14 @@ bool isolate_movable_page(struct page *page, isolate_mode_t mode) __SetPageIsolated(page); unlock_page(page); - return true; + return 0; out_no_isolated: unlock_page(page); out_putpage: put_page(page); out: - return false; + return ret; } /* It should be called on page which is PG_movable */ -- 1.9.1