[crac] RFR: PID adjustment on checkpoint [v3]

[Anton Kozlov]

On Wed, 21 Jun 2023 13:55:03 GMT, Roman Marchenko <rmarchenko at openjdk.org> wrote:

>> This can be an error, as `ns_last_pid` is expected to exist and be openable.
>
> In non-privileged containers, ns_last_pid cannot be even open for writing. So this message may be considered as a warning, or info, or suppressed at all as Radim suggested.

Oh, of course. In case we cannot even open that, and that is expected, we should not print anything.

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PR Review Comment: https://git.openjdk.org/crac/pull/86#discussion_r1237291645