Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751328AbaJPDgS (ORCPT ); Wed, 15 Oct 2014 23:36:18 -0400 Received: from [42.62.48.242] ([42.62.48.242]:15935 "EHLO manager.mioffice.cn" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1750969AbaJPDgR (ORCPT ); Wed, 15 Oct 2014 23:36:17 -0400 From: Hui Zhu To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , Hui Zhu Subject: [PATCH 0/4] (CMA_AGGRESSIVE) Make CMA memory be more aggressive about allocation Date: Thu, 16 Oct 2014 11:35:47 +0800 Message-ID: <1413430551-22392-1-git-send-email-zhuhui@xiaomi.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [172.27.14.101] X-ClientProxiedBy: CNCAS1.mioffice.cn (10.237.8.131) To cnbox4.mioffice.cn (10.237.8.144) X-EsetResult: clean, is OK X-EsetId: 587748382C4597170C3011 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In fallbacks of page_alloc.c, MIGRATE_CMA is the fallback of MIGRATE_MOVABLE. MIGRATE_MOVABLE will use MIGRATE_CMA when it doesn't have a page in order that Linux kernel want. If a system that has a lot of user space program is running, for instance, an Android board, most of memory is in MIGRATE_MOVABLE and allocated. Before function __rmqueue_fallback get memory from MIGRATE_CMA, the oom_killer will kill a task to release memory when kernel want get MIGRATE_UNMOVABLE memory because fallbacks of MIGRATE_UNMOVABLE are MIGRATE_RECLAIMABLE and MIGRATE_MOVABLE. This status is odd. The MIGRATE_CMA has a lot free memory but Linux kernel kill some tasks to release memory. This patch series adds a new function CMA_AGGRESSIVE to make CMA memory be more aggressive about allocation. If function CMA_AGGRESSIVE is available, when Linux kernel call function __rmqueue try to get pages from MIGRATE_MOVABLE and conditions allow, MIGRATE_CMA will be allocated as MIGRATE_MOVABLE first. If MIGRATE_CMA doesn't have enough pages for allocation, go back to allocate memory from MIGRATE_MOVABLE. Then the memory of MIGRATE_MOVABLE can be kept for MIGRATE_UNMOVABLE and MIGRATE_RECLAIMABLE which doesn't have fallback MIGRATE_CMA. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/