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docs: Improve description of <hard_limit>

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/domain/memtune/hard_limit provides a way to cap the memory a VM process
can use, including the amount of memory the process can lock. When memory
locking of a VM is requested, <hard_limit> can be used to prevent the
potential host DoS issue mentioned in /domain/memoryBacking/locked
description.

This patch improves the <hard_limit> text by clarifying it can be used
to prevent "host crashing" when VM memory is locked.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
This commit is contained in:
Jim Fehlig 2018-12-14 14:44:57 -07:00
parent 57a9e49232
commit fe8eb8839a
1 changed files with 3 additions and 3 deletions
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6
docs/formatdomain.html.in
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@ -1243,9 +1243,9 @@
<a href="#elementsMemoryBacking">memory backing</a> because your
workload demands it, you'll have to take into account the specifics of
your deployment and figure out a value for <code>hard_limit</code> that
balances the risk of your guest being killed because the limit was set
too low and the risk of your host crashing because it cannot reclaim
the memory used by the guest due to <code>locked</code>. Good luck!</dd>
is large enough to support the memory requirements of your guest, but
small enough to protect your host against a malicious guest locking all
memory.</dd>
<dt><code>soft_limit</code></dt>
<dd> The optional <code>soft_limit</code> element is the memory limit to
enforce during memory contention. The units for this value are