From: Dan Smith <danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
To: Daniel Lezcano <daniel.lezcano-GANU6spQydw@public.gmane.org>
Cc: containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org
Subject: Re: [RFC] Payloads and transient filesystem support for user-cr
Date: Wed, 02 Mar 2011 16:23:17 -0800 [thread overview]
Message-ID: <877hch6oi2.fsf@caffeine.danplanet.com> (raw)
In-Reply-To: 4D6EBF24.4000601@free.fr
DL> The posix semaphore use the mapped deleted hardlinked files.
DL> AFAIK, the current implementation do not support that, no ?
DL> How is it possible to CR programs using sem_* operations in this case ?
You're right. This addresses the problem of /dev/shm/sem.foo going away
when the container's /dev/shm mount is destroyed. It does not address
the fact that the mmap()'d unlinked file is restored as an anonymous
region and therefore becomes disjoint with the one on-disk. I expect
the evolution of the unlinked files patches will resolve that.
Our naive tests are not discriminating enough to make this distinction
at the moment, which certainly needs to be resolved :)
--
Dan Smith
IBM Linux Technology Center
email: danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org
next prev parent reply other threads:[~2011-03-03 0:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-02 21:35 [RFC] Payloads and transient filesystem support for user-cr Dan Smith
[not found] ` <1299101725-17603-1-git-send-email-danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2011-03-02 21:35 ` [PATCH 1/3] Make extract_headers.sh grab setns as well Dan Smith
2011-03-02 21:35 ` [PATCH 2/3] Export some things from restart.c Dan Smith
2011-03-02 21:35 ` [PATCH 3/3] [RFC] Add transient filesystem support to user-cr Dan Smith
2011-03-02 22:05 ` [RFC] Payloads and transient filesystem support for user-cr Daniel Lezcano
2011-03-03 0:23 ` Dan Smith [this message]
[not found] ` <877hch6oi2.fsf-FLMGYpZoEPULwtHQx/6qkW3U47Q5hpJU@public.gmane.org>
2011-03-03 8:35 ` Daniel Lezcano
2011-03-03 14:41 ` Dan Smith
[not found] ` <87vd005ks5.fsf-FLMGYpZoEPULwtHQx/6qkW3U47Q5hpJU@public.gmane.org>
2011-03-03 18:18 ` Daniel Lezcano
[not found] ` <4D6FDB71.7050603-GANU6spQydw@public.gmane.org>
2011-03-03 18:30 ` Dan Smith
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