Fwd: Question about the size of VMCOREINFO

[Donny Xia]

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---------- Forwarded message ---------
From: Donny Xia <donnyxia at google.com>
Date: Wed, Aug 10, 2022 at 3:39 PM
Subject: Question about the size of VMCOREINFO
To: <dyoung at redhat.com>
Cc: <bhe at redhat.com>, <vgoyal at redhat.com>, <kexec at lists.infradead.org>


Hello Kdump Maintainers,

We utilize the kexec and kdump feature heavily to collect the crash
dump file when the kernel crashes. We write some customized values
into VMCOREINFO and we find that eventually the size of the data we
write exceeds the size of VMCOREINFO. I find that the size of
VMCOREINFO is one page, which I believe is 4k. I am wondering is there
any specific reason to choose this size? Is it possible to use a
bigger number? Any suggestions about it would be appreciated.

Thanks.

Regards,
Donny Xia