Re: Vmalloc Information Needed

[pramod gurav <pramod.gurav.etc@xxxxxxxxx>]

Hi Arun,

On Tue, Mar 25, 2014 at 3:55 PM, Arun KS <getarunks@xxxxxxxxx> wrote:

Hello Anup,

On Sun, Mar 23, 2014 at 9:54 AM, Anup Buchke <anup.estuff@xxxxxxxxx> wrote:

> For a user/kernel configuration of 3/1GB and (0-16M DMA , 16-896 - Low , 896
> - 1024 - High )
> Q: Is amount of memory allocated to Vmalloc limited to 128MB?

No. 128MB is the default vmalloc size. You can override by kernel boot
argument vmalloc=n[KMG]

Ok. So will this reduce(adjust) the LOW_MEM and add that reduced LOW_MEM to HIGH_MEM region in virtual address space?

Thanks,
Arun

>
> I read an article which said to increase the Vmalloc allocation size we need
> to either
> 1) Change user/kernel distribution like 2.75/1.25 which proportionately
> increase the address space available to High memory
> 2) For a fixed user/kernel distribution reduce the low memory like 16-800
> thereby increasing the size available for high memory.
>
> In either of the case the memory for vmalloc is limited to user/kernel
> distribution . i.e. the amount of virtual address space available in high
> memory.
>
> I am a beginner, so please let me know if my understanding is correct..and
> rectify in-case of wrong.?
>
> Thanks,
> Anup Buchke.
>

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Thanks and Regards
Pramod

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