Re: Free memory, include "cached"?

[Matthias Kaehlcke <matthias@xxxxxxxxxxxx>]

El Tue, Oct 14, 2008 at 03:03:27PM +0200 Gilles Chanteperdrix ha dit:

> Gregoire Banderet wrote:
> > Matthias Kaehlcke wrote:
> >> El Tue, Oct 14, 2008 at 02:14:46PM +0200 Gregoire Banderet ha dit:
> >>
> >>> anubhav rakshit wrote:
> >>>>> I have to report the amount of FreeMem on my embedded system. The rootfs
> >>>>> is in RAM. I use /proc/meminfo.
> >>>>> I started by doing : freemem = MemFree + Buffers + Cached
> >>>>> But I realized (tell me if I'm wrong) that my rootfs filesystems is
> >>>>> counted in "Cached".
> >>>>> Part of the memory in "Cached" can be allocated, so I should add it as
> >>>>> Free Memory, but part of it is my rootfs (i.e. really used).
> >>>>> How should I compute freemem ?
> >>>> Have you tried the free command.
> >>> Yes. What I need is to know which part of "Cached" is used for RAMFS.
> >> to know the size of your ramfs you may execute the following command:
> >>
> >> du -hx -d 0 /
> 
> If you want to get the space occupied on a partition, you should use df,
> not du.

depends on the type of the partition. df doesn't work with initramfs,
i suppose the reason is that an initramfs image has no partition size,
so it doesn't make sense to report free disk space.

-- 
Matthias Kaehlcke
Embedded Linux Engineer
Barcelona

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