From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f46.google.com (mail-pa0-f46.google.com [209.85.220.46]) by kanga.kvack.org (Postfix) with ESMTP id DE7CF6B0069 for ; Wed, 15 Oct 2014 23:36:16 -0400 (EDT) Received: by mail-pa0-f46.google.com with SMTP id fa1so2558745pad.19 for ; Wed, 15 Oct 2014 20:36:16 -0700 (PDT) Received: from manager.mioffice.cn ([42.62.48.242]) by mx.google.com with ESMTP id rf9si17524319pbc.221.2014.10.15.20.36.14 for ; Wed, 15 Oct 2014 20:36:15 -0700 (PDT) From: 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> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz, m.szyprowski@samsung.com, akpm@linux-foundation.org, mina86@mina86.com, aneesh.kumar@linux.vnet.ibm.com, iamjoonsoo.kim@lge.com, hannes@cmpxchg.org, riel@redhat.com, mgorman@suse.de, minchan@kernel.org, nasa4836@gmail.com, ddstreet@ieee.org, hughd@google.com, mingo@kernel.org, rientjes@google.com, peterz@infradead.org, keescook@chromium.org, atomlin@redhat.com, raistlin@linux.it, axboe@fb.com, paulmck@linux.vnet.ibm.com, kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com, k.khlebnikov@samsung.com, msalter@redhat.com, deller@gmx.de, tangchen@cn.fujitsu.com, ben@decadent.org.uk, akinobu.mita@gmail.com, lauraa@codeaurora.org, vbabka@suse.cz, sasha.levin@oracle.com, vdavydov@parallels.com, suleiman@google.com Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-mm@kvack.org, Hui Zhu 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, 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