linux-kernel - [PATCH 1/4] (CMA_AGGRESSIVE) Add CMA

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Message-ID: <1413430551-22392-2-git-send-email-zhuhui@xiaomi.com>
Date:	Thu, 16 Oct 2014 11:35:48 +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>,
	<mina86@...a86.com>, <aneesh.kumar@...ux.vnet.ibm.com>,
	<iamjoonsoo.kim@....com>, <hannes@...xchg.org>, <riel@...hat.com>,
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	<keescook@...omium.org>, <atomlin@...hat.com>, <raistlin@...ux.it>,
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	<vdavydov@...allels.com>, <suleiman@...gle.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-mm@...ck.org>, Hui Zhu <zhuhui@...omi.com>
Subject: [PATCH 1/4] (CMA_AGGRESSIVE) Add CMA_AGGRESSIVE to Kconfig

Add CMA_AGGRESSIVE config that depend on CMA to Linux kernel config.
Add CMA_AGGRESSIVE_PHY_MAX, CMA_AGGRESSIVE_FREE_MIN and CMA_AGGRESSIVE_SHRINK
that depend on CMA_AGGRESSIVE.

If physical memory size (not include CMA memory) in byte less than or equal to
CMA_AGGRESSIVE_PHY_MAX, CMA aggressive switch (sysctl vm.cma-aggressive-switch)
will be opened.

When system boot, this value will set to sysctl "vm.cma-aggressive-free-min".

If this value is true, sysctl "vm.cma-aggressive-shrink-switch" will be set to
true when Linux boot.

Signed-off-by: Hui Zhu <zhuhui@...omi.com>
---
 mm/Kconfig | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index 1d1ae6b..940f5f3 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -527,6 +527,49 @@ config CMA_AREAS
 
 	  If unsure, leave the default value "7".
 
+config CMA_AGGRESSIVE
+	bool "CMA aggressive"
+	depends on CMA
+	default n
+	help
+	  Be more aggressive about taking memory from CMA when allocate MOVABLE
+	  page.
+	  Sysctl "vm.cma-aggressive-switch", "vm.cma-aggressive-alloc-max"
+	  and "vm.cma-aggressive-shrink-switch" can control this function.
+	  If unsure, say "n".
+
+config CMA_AGGRESSIVE_PHY_MAX
+	hex "Physical memory size in Bytes that auto turn on the CMA aggressive switch"
+	depends on CMA_AGGRESSIVE
+	default 0x40000000
+	help
+	  If physical memory size (not include CMA memory) in byte less than or
+	  equal to this value, CMA aggressive switch will be opened.
+	  After the Linux boot, sysctl "vm.cma-aggressive-switch" can control
+	  the CMA AGGRESSIVE switch.
+
+config CMA_AGGRESSIVE_FREE_MIN
+	int "The minimum free CMA page number that CMA aggressive work"
+	depends on CMA_AGGRESSIVE
+	default 500
+	help
+	  When system boot, this value will set to sysctl
+	  "vm.cma-aggressive-free-min".
+	  If the number of CMA free pages is small than this sysctl value,
+	  CMA aggressive will not work.
+
+config CMA_AGGRESSIVE_SHRINK
+	bool "CMA aggressive shrink"
+	depends on CMA_AGGRESSIVE
+	default y
+	help
+	  If this value is true, sysctl "vm.cma-aggressive-shrink-switch" will
+	  be set to true when Linux boot.
+	  If sysctl "vm.cma-aggressive-shrink-switch" is true and free normal
+	  memory's size is smaller than the size that it want to allocate,
+	  do memory shrink before driver allocate pages from CMA.
+	  If unsure, say "y".
+
 config MEM_SOFT_DIRTY
 	bool "Track memory changes"
 	depends on CHECKPOINT_RESTORE && HAVE_ARCH_SOFT_DIRTY && PROC_FS
-- 
1.9.1

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