How the HIGHMEM value is set ?

[gauravsuryavans]

I need to mapped all (reduce size of highmem) the memory with kernel. but my default boot log is as below.

"Memory: 1222984K/1446656K available (10240K kernel code, 2287K rwdata, 3232K rodata, 2048K init, 497K bss, 190904K reserved, 32768K cma-reserved, 805632K highmem)"

How/where highmem value is define ?

What is default value ?

 Total DRAM : 2GB

Response is appreciated.

Regards,

Pankaj

[igorpadykov]

Hi Pankaj

one can check linux documentation:

Documentation - linux-imx - i.MX Linux kernel 

memory.txt\arm\Documentation - linux-imx - i.MX Linux kernel 

highmem.txt\vm\Documentation - linux-imx - i.MX Linux kernel 

Best regards
igor
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[gauravsuryavans]

Hi Igor,

Thanks for your quick response.

I have changed my CONFIG_VMSPLIT  option to 2G/2G.(from 3G/1G).

Now Highmem Value is changed, So my question is how it is calculated ?

and now i am getting following Error in log :

[    5.795087] ueventd: Coldboot took 0.106 seconds
[    5.804560] init: wait for '/dev/.coldboot_done' took 50ms
[    5.810509] init: Command 'wait_for_coldboot_done' action=wait_for_coldboot_done (<Builtin Action>:0) took 56ms and succeeded
[    5.821890] init: processing action (MixHwrngIntoLinuxRng) from (<Builtin Action>:0)
[    5.829839] init: /dev/hw_random not found
[    5.833966] init: processing action (SetMmapRndBits) from (<Builtin Action>:0)
[    5.841483] init: Unable to set minimum option value 16 in /proc/sys/vm/mmap_rnd_bits
[    5.849472] init: Unable to set adequate mmap entropy value!
[    5.855134] init: Reboot start, reason: reboot, rebootTarget: bootloader
[    5.862072] init: Shutdown timeout: 0 ms
[    5.868356] init: starting service 'blank_screen'...

Any Idea about above error ?

Regards,

Pankaj

[igorpadykov]

Hi Pankaj

as this is general linux question it may be posted on kernel mail list

Majordomo Lists at VGER.KERNEL.ORG 

Best regards
igor