Vmalloc Information Needed

[pramod gurav]

Hi Arun,


On Tue, Mar 25, 2014 at 3:55 PM, Arun KS <getarunks at gmail.com> wrote:

> Hello Anup,
>
> On Sun, Mar 23, 2014 at 9:54 AM, Anup Buchke <anup.estuff at gmail.com>
> 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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