[Bug 213462] Retry_count in minidump code delaying ENOSPC by around 30 minutes for live cores.

[bugzilla...@freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213462

Bug ID: 213462
Summary: Retry_count in minidump code delaying ENOSPC by around
30 minutes for live cores.
Product: Base System
Version: 10.3-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebs...@FreeBSD.org
Reporter: ravipraka...@gmail.com

I notice that when, the system runs out of space and we are trying to get a
live core dump there is delay of around 30 minutes to return ENOSPC to the
upper layers. This is on AMD64. As I go through the code , I see a change to
the amd64 not present in other platforms in sys/amd64/amd64/minidump_machdep.c
Its the retry count set to 5 ( Not sure where that number comes from ).
Because of this, the live core generation in our platform is delayed and the
memory map keeps increasing( lots of other stuff running ) it makes things
worse. I want to make this retry count a tunable so that it can be changed at
runtime accordingly.

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