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

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Message-ID: <20141018221525.GB10843@amd>
Date:	Sun, 19 Oct 2014 00:15:25 +0200
From:	Pavel Machek <pavel@...x.de>
To:	Hui Zhu <zhuhui@...omi.com>
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Subject: Re: [PATCH 1/4] (CMA_AGGRESSIVE) Add CMA_AGGRESSIVE to Kconfig

Hi!

> 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.

Ok...

Do I understand it correctly that there is some problem with
hibernation not working on machines not working on machines with big
CMA areas...?

But adding 4 config options end-user has no chance to set right can
not be the best solution, can it?

> +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.

For example... how am I expected to figure right value to place here?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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