linux-kernel - [PATCH 0/4] (CMA_AGGRESSIVE) Make CMA memory be more aggressive about allocation

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Date:	Thu, 16 Oct 2014 11:35:47 +0800
From:	Hui Zhu <zhuhui@...omi.com>
To:	<rjw@...ysocki.net>, <len.brown@...el.com>, <pavel@....cz>,
	<m.szyprowski@...sung.com>, <akpm@...ux-foundation.org>,
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CC:	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-mm@...ck.org>, Hui Zhu <zhuhui@...omi.com>
Subject: [PATCH 0/4] (CMA_AGGRESSIVE) Make CMA memory be more aggressive about allocation

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.

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