makedumpfile and tmpfs contents

makedumpfile and tmpfs contents

[Rajendra Dendukuri]

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Hi,

Is there a possibility or an option to recover contents of a tmpfs by
the crashkernel after the original kernel has kdump'ed. The idea is to
store a few other system log files stored in a tmpfs similar to how
dmesg logs are recovered. Any other ideas to solve this requirement?

Regards,
Rajen

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Re: makedumpfile and tmpfs contents

[Kazuhito Hagio]

Hi Rajen,

On Fri, Dec 11, 2020 at 11:36 PM Rajendra Dendukuri
<rajendra.dendukuri@broadcom.com> wrote:
>
> Hi,
>
> Is there a possibility or an option to recover contents of a tmpfs by
> the crashkernel after the original kernel has kdump'ed. The idea is to
> store a few other system log files stored in a tmpfs similar to how
> dmesg logs are recovered. Any other ideas to solve this requirement?

I think it would be too hard for makedumpfile to do this, but if you can use
the crash utility to extract contents of a tmpfs from a vmcore, my "cacheutils"
crash extension module [1] might be useful, since tmpfs uses page cache.

[1] https://github.com/k-hagio/crash-cacheutils

Thanks,
Kazu

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