How to enable zramfs in android...

[sandeep kumar]

Dear All

Thanks for your help. I could activate zram0, after doing the mkswap on the
device.

These all steps i followed,

echo 50M > /sys/block/zram0/disksize
mkswap /dev/block/zram0
swapon -p 100 /dev/block/zram0

after that, i saw my swap partition is being used. From the stats i saw
44MB RAM data is compressed into 14MB.

But i have a doubt, When i reserve 50M RAM for swap partition, is it like a
carve out memory?
i mean Kernel cant use this anymore?




On Sat, May 24, 2014 at 12:31 PM, Chen, Yiqun <feedingfranzy at gmail.com>wrote:

> Um, well that sounds pretty weird.
> Have you checked that you've loaded that module? If so, I guess there's
> something wrong with modprobe stuff that it didn't mknod for zram, so
> try mknod for zram manually.
> Check your /dev/block/ directory for the device numbers. On my box it
> was 254:0 254:1 which were mapped to my zram0 and zram1 respectively.
> Then:
> mknod /dev/zram0 b 254 0
> It should create a suitable /dev/zram* for you. Then try mkswap-swapon
> procedure as others suggest. Please notice that -p argument for swapon is
> somehow
> necessary since on my gentoo box the priority of swap devices is set minus
> by default. So your system may not use the zram swap at all even if
> you've successfully create the zram device for it.
> Please let my know if it still doesn't work :-)
> On Fri, May 23, 2014 at 02:51:39PM +0530, sandeep kumar wrote:
> > >>In my system /dev/zram0 is not present but sys/block/zram0 is present.
> > thats why i m having this doubt
> > just now i found that we have zram0 in /dev/block/zram0
> > i tried the command you told,
> >
> > *root at kleoslte:/ # swapon -p 100 /dev/block/zram0*
> > *swapon -p 100 /dev/block/zram0*
> > *swapon failed for /dev/block/zram0*
> >
> > is there anything else that i can try?
> >
> >
> >
> > On Fri, May 23, 2014 at 2:18 PM, sandeep kumar <
> coolsandyforyou at gmail.com>wrote:
> >
> > > Dear Anders
> > >
> > > >Yes, zram is activated, otherwise you wouldn't have had zram0 created.
> > >
> > > >Though you might not be using it...
> > > >If you want to use it for swap, you'll have to run `swapon -p 100
> > > /dev/zram0`.
> > > >Well, '-p 100' isn't necessary, it's just to set the swap priority.
> > >
> > > In my system /dev/zram0 is not present but sys/block/zram0 is present.
> > > thats why i m having this doubt
> > >
> > > thanks
> > > sandeep
> > >
> > >
> > > On Thu, May 22, 2014 at 4:56 PM, Anders Darander <
> > > anders.darander at gmail.com> wrote:
> > >
> > >> On 22 May 2014 12:58, sandeep kumar <coolsandyforyou at gmail.com>
> wrote:
> > >> > Dear All,
> > >> >
> > >> > we are trying to make use of zramfs. In our android based board,
> > >> > we are seeing this output,
> > >> >
> > >> > root at sandeep:/sys/block/zram0 # ls
> > >>
> > >> >
> > >> > Does this mean zram is activated ?
> > >>
> > >> Yes, zram is activated, otherwise you wouldn't have had zram0 created.
> > >>
> > >> Though you might not be using it...
> > >> If you want to use it for swap, you'll have to run `swapon -p 100
> > >> /dev/zram0`.
> > >> Well, '-p 100' isn't necessary, it's just to set the swap priority.
> > >>
> > >> > we are trying to do the operation to set disk size,
> > >> > echo $((50*1024*1024)) > /sys/block/zram0/disksize
> > >>
> > >> This should have set the size of zram0.
> > >>
> > >> Cheers,
> > >> Anders
> > >>
> > >> --
> > >> Anders Darander
> > >> EPO guidelines 1978: "If the contribution to the known art resides
> > >> solely in a computer program then the subject matter is not
> > >> patentable in whatever manner it may be presented in the claims."
> > >>
> > >
> > >
> > >
> > > --
> > > With regards,
> > > Sandeep Kumar Anantapalli,
> > >
> >
> >
> >
> > --
> > With regards,
> > Sandeep Kumar Anantapalli,
>
> > _______________________________________________
> > Kernelnewbies mailing list
> > Kernelnewbies at kernelnewbies.org
> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
> --
> Best regards
> Chen, Yiqun
>



-- 
With regards,
Sandeep Kumar Anantapalli,
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