linux-kernel - Re: [PATCH] free e820 reserved memory in bootargs memmap

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Date:   Tue, 10 Apr 2018 10:32:03 +0800
From:   zoucao-ipc <zoucao@...ux.alibaba.com>
To:     tglx@...utronix.de
CC:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] free e820 reserved memory in bootargs memmap

I found commit characters errors, please ignore this path, V2 will be 
sent soon

On 2018/4/8 下午2:41, zoucao@...ux.alibaba.com wrote:
> add a new chareater "-" in bootargs memmap, you can use this chareater to free
> e820 reserved memory, for example:
>
> reserved iomem:
> 	cat /proc/iomem:
> 	......
> 	00100000-6aefefff : System RAM
> 	  01000000-0165537a : Kernel code
> 	  0165537b-01a8873f : Kernel data
> 	  01c31000-01f4efff : Kernel bss
> 	  28000000-320fffff : Crash kernel
> 	6aeff000-6effffff : reserved       --> it is e820 reserved memory
> 	6f000000-78240fff : System RAM
> 	......
>
>
> add bootargs memmap=0x4101000-0x6aeff000, to free memory region: 6aeff000-6effffff
> then 6aeff000-6effffff will be merged into 00100000-78240fff.
>
> new iomem:
> 	cat /proc/iomem:
> 	......
> 	00100000-78240fff : System RAM
> 	  01000000-0165537a : Kernel code
> 	  0165537b-01a8873f : Kernel data
> 	  01c31000-01f4efff : Kernel bss
> 	......