Re: makedumpfile memory usage grows with system memory size

tachibana
2012-04-02T06:58:53Z

Hi Don,

On 2012/03/30 09:19:16 -0400, Don Zickus <dzickus@redhat.com> wrote:
> On Fri, Mar 30, 2012 at 06:43:34PM +0900, Atsushi Kumagai wrote:
> > Hello Don,
> > Does setting TMPDIR solve your problem ? Please refer to the man page.
> >
> >
> > ENVIRONMENT VARIABLES
> > TMPDIR This environment variable is for a temporary memory bitmap
> > file. If your machine has a lots of memory and you use tmpfs
> > on /tmp, makedumpfile can fail for a little memory in the 2nd
> > kernel because makedumpfile makes a very large temporary memory
> > bitmap file in this case. To avoid this failure, you can set a
> > TMPDIR environment variable. If you do not set a TMPDIR envi-
> > ronment variable, makedumpfile uses /tmp directory for a tempo-
> > rary bitmap file as a default.
>
> I do not think it will because we run the second kernel inside the
> initramfs and do not mount any extra disks. So the only location available
> for the temporary memory bitmap would be memory either tmpfs or something
> else. Regardless the file ends up in memory.

If a file system for a dump file is on the local system, it is effective that
we specify a directory as TMPDIR in the same file system, isn't it?

Thanks
tachibana

>
> >
> >
> > On the other hand, I'm considering the enhancement suggested by Hatayama-san now.
>
> His idea looks interesting if it works. Thanks.
>
> Cheers,
> Don
>
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