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Re: [libvirt] [PATCH] docs: Discourage users to set hard_limit



On Mon, Aug 19, 2013 at 12:02:47PM +0200, Michal Privoznik wrote:
> In one of my previous patches I am removing the hard_limit heuristic to
> guess the correct value if none set. However, it turned out, this limit
> is hard to guess even for users. We should advise them to not set the
> limit as their domains may be OOM killed. Sigh.
> ---
>  docs/formatdomain.html.in | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 83d551a..93234a4 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -676,7 +676,10 @@
>        <dt><code>hard_limit</code></dt>
>        <dd> The optional <code>hard_limit</code> element is the maximum memory
>          the guest can use. The units for this value are kibibytes (i.e. blocks
> -        of 1024 bytes)</dd>
> +        of 1024 bytes). <strong>However, users are strongly advised not to set
> +        this limit as domain may get killed by the kernel. To determine the
> +        memory needed for a process to run is <a href="http://en.wikipedia.org/wiki/Undecidable_problem";>
> +        undecidable problem</a>.</strong></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

Can you   s/users/users of QEMU and KVM/   since it is fine for LXC guests


Daniel
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