Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968301AbdIZJCx (ORCPT ); Tue, 26 Sep 2017 05:02:53 -0400 Received: from outboundhk.mxmail.xiaomi.com ([207.226.244.125]:11601 "EHLO xiaomi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S968287AbdIZJCv (ORCPT ); Tue, 26 Sep 2017 05:02:51 -0400 From: Hui Zhu To: , , , , , , CC: , Hui Zhu Subject: [RFC 1/2] Try to use HighAtomic if try to alloc umovable page that order is not 0 Date: Tue, 26 Sep 2017 16:46:43 +0800 Message-ID: <1506415604-4310-2-git-send-email-zhuhui@xiaomi.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1506415604-4310-1-git-send-email-zhuhui@xiaomi.com> References: <1506415604-4310-1-git-send-email-zhuhui@xiaomi.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.235.171.212] X-ClientProxiedBy: CNCAS3.mioffice.cn (10.237.8.133) To cnbox6.mioffice.cn (10.237.8.146) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1569 Lines: 44 The page add a new condition to let gfp_to_alloc_flags return alloc_flags with ALLOC_HARDER if the order is not 0 and migratetype is MIGRATE_UNMOVABLE. Then alloc umovable page that order is not 0 will try to use HighAtomic. Signed-off-by: Hui Zhu --- mm/page_alloc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c841af8..b54e94a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3642,7 +3642,7 @@ static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) } static inline unsigned int -gfp_to_alloc_flags(gfp_t gfp_mask) +gfp_to_alloc_flags(gfp_t gfp_mask, int order, int migratetype) { unsigned int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; @@ -3671,6 +3671,8 @@ static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) alloc_flags &= ~ALLOC_CPUSET; } else if (unlikely(rt_task(current)) && !in_interrupt()) alloc_flags |= ALLOC_HARDER; + else if (order > 0 && migratetype == MIGRATE_UNMOVABLE) + alloc_flags |= ALLOC_HARDER; #ifdef CONFIG_CMA if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE) @@ -3903,7 +3905,7 @@ bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) * kswapd needs to be woken up, and to avoid the cost of setting up * alloc_flags precisely. So we do that now. */ - alloc_flags = gfp_to_alloc_flags(gfp_mask); + alloc_flags = gfp_to_alloc_flags(gfp_mask, order, ac->migratetype); /* * We need to recalculate the starting point for the zonelist iterator -- 1.9.1