Is there linux RAM filesystem with a fixed amount of memory?‏

Is there linux RAM filesystem with a fixed amount of memory?‏

[Chen Pei Chao]

Hi All,
 
Is there any RAM file system that use a fixed amount of memory at all times
and will not grow and
shrink dynamically like tmpfs?
Thanks in advance.
 
Regards,
Jackie

Re: Is there linux RAM filesystem with a fixed amount of memory?‏

[David Newall]

> Is there any RAM file system that use a fixed amount of memory at all times
> and will not grow and shrink dynamically like tmpfs?

ramfs

Re: Is there linux RAM filesystem with a fixed amount of memory?‏

[Sven-Haegar Koch]

On Tue, 19 Aug 2008, Chen Pei Chao wrote:

> Is there any RAM file system that use a fixed amount of memory at all times
> and will not grow and
> shrink dynamically like tmpfs?
> Thanks in advance.

There are the old-style ramdisk block-devices, which will just claim the 
specified amount of memory and can be formatted with any filesystem.

c'ya
sven

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Re: Is there linux RAM filesystem with a fixed amount of memory?‏

[Chen Pei Chao]

>> Is there any RAM file system that use a fixed amount of memory at all
times
>> and will not grow and shrink dynamically like tmpfs?

>ramfs

I mounted a ramfs filesystem with 10M size, and have a check of
/proc/meminfo.
I find the ramfs also did not have the memory preallocation.

I just add one line into /etc/fstab
none 	/tmp	ramfs	size=10m	0	0 

Any wrong in my steps?

Regards,
Jackie	  	

Re: Is there linux RAM filesystem with a fixed amount of memory?‏

[David Newall]

Chen Pei Chao wrote:
> I mounted a ramfs filesystem with 10M size, and have a check of
> /proc/meminfo.
> I find the ramfs also did not have the memory preallocation.
>   
Apparently I misunderstood what ramfs does.  Sorry for misdirecting you.

RE: Is there linux RAM filesystem with a fixed amount of memory?‏

[Chen Pei Chao]

 

> 
> Chen Pei Chao wrote:
> > I mounted a ramfs filesystem with 10M size, and have a check of
/proc/meminfo.
> > I find the ramfs also did not have the memory preallocation.
> >   
> Apparently I misunderstood what ramfs does.  Sorry for misdirecting you.

Never mind of this, and I use the kernel startup parameter "mem=10M" to
reserved the 
Memory that I don't want to use. Thanks.

Jackie
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