From: Andrey Mirkin <major@openvz.org>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>,
containers@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Pavel Emelyanov <xemul@openvz.org>
Subject: Re: [Devel] Re: [PATCH 08/10] Introduce functions to restart a process
Date: Fri, 24 Oct 2008 08:04:41 +0400 [thread overview]
Message-ID: <200810240804.42500.major@openvz.org> (raw)
In-Reply-To: <1224769753.12673.12.camel@nimitz>
On Thursday 23 October 2008 17:49 Dave Hansen wrote:
> On Thu, 2008-10-23 at 13:54 +0400, Andrey Mirkin wrote:
> > We are putting special structure on stack, which is used at the very end
> > of the whole restart procedure to restore complex states (ptrace is one
> > of such cases). Right now I don't need to use this structure as we have a
> > deal with simple cases, but reservation of 256 bytes on stack is needed
> > for future.
>
> Wow. So you're saying that, if this patch is accepted, we simply need
> to accept that anything being checkpointed will use an extra 256 bytes
> of stack? Seems like something to perhaps put in the changelog rather
> than some completely undocumented assembly nugget.
This 256 bytes will be used only during restart procedure and only by our
module. As you can see in i386_ret_from_resume we are restoring it back. So,
when process will return to user space it will not have extra 256 bytes
reserved on stack already. I will add information about it to documentation
and changelog.
Andrey
next prev parent reply other threads:[~2008-10-24 4:04 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-17 23:11 [PATCH 0/10] OpenVZ kernel based checkpointing/restart (v2) Andrey Mirkin
2008-10-17 23:11 ` [PATCH 01/10] Introduce trivial sys_checkpoint and sys_restore system calls Andrey Mirkin
2008-10-17 23:11 ` [PATCH 02/10] Make checkpoint/restart functionality modular Andrey Mirkin
2008-10-17 23:11 ` [PATCH 03/10] Introduce context structure needed during checkpointing/restart Andrey Mirkin
2008-10-17 23:11 ` [PATCH 04/10] Introduce container dump function Andrey Mirkin
2008-10-17 23:11 ` [PATCH 05/10] Introduce function to dump process Andrey Mirkin
2008-10-17 23:11 ` [PATCH 06/10] Introduce functions to dump mm Andrey Mirkin
2008-10-17 23:11 ` [PATCH 07/10] Introduce function for restarting a container Andrey Mirkin
2008-10-17 23:11 ` [PATCH 08/10] Introduce functions to restart a process Andrey Mirkin
2008-10-17 23:11 ` [PATCH 09/10] Introduce functions to restore mm Andrey Mirkin
2008-10-17 23:11 ` [PATCH 10/10] Add support for multiple processes Andrey Mirkin
2008-10-27 15:58 ` Oren Laadan
2008-10-30 4:55 ` [Devel] " Andrey Mirkin
2008-10-20 9:23 ` [PATCH 08/10] Introduce functions to restart a process Cedric Le Goater
2008-10-22 8:49 ` [Devel] " Andrey Mirkin
2008-10-22 9:25 ` Louis Rilling
2008-10-22 10:06 ` Greg Kurz
2008-10-22 10:44 ` Louis Rilling
2008-10-22 12:44 ` Greg Kurz
2008-10-22 10:12 ` Andrey Mirkin
2008-10-22 10:46 ` Louis Rilling
2008-10-23 8:53 ` Andrey Mirkin
2008-10-22 15:25 ` Oren Laadan
2008-10-23 9:00 ` Andrey Mirkin
2008-10-23 13:57 ` Dave Hansen
2008-10-24 3:57 ` Andrey Mirkin
2008-10-25 21:10 ` Oren Laadan
2008-10-29 14:52 ` Andrey Mirkin
2008-10-30 15:59 ` Oren Laadan
2008-10-22 12:47 ` Cedric Le Goater
2008-10-23 9:54 ` Andrey Mirkin
2008-10-23 13:49 ` Dave Hansen
2008-10-24 4:04 ` Andrey Mirkin [this message]
2008-10-20 13:25 ` Louis Rilling
2008-10-23 10:56 ` [Devel] " Andrey Mirkin
2008-10-20 12:25 ` [PATCH 06/10] Introduce functions to dump mm Louis Rilling
2008-10-22 8:58 ` [Devel] " Andrey Mirkin
2008-10-20 17:21 ` Dave Hansen
2008-10-23 8:43 ` [Devel] " Andrey Mirkin
2008-10-23 13:51 ` Dave Hansen
2008-10-24 4:07 ` Andrey Mirkin
2008-10-20 11:02 ` [PATCH 05/10] Introduce function to dump process Louis Rilling
2008-10-24 4:15 ` [Devel] " Andrey Mirkin
2008-10-20 17:48 ` Serge E. Hallyn
2008-10-24 4:40 ` [Devel] " Andrey Mirkin
2008-10-20 17:02 ` [PATCH 03/10] Introduce context structure needed during checkpointing/restart Dave Hansen
2008-10-29 15:30 ` [Devel] " Andrey Mirkin
2008-10-20 16:51 ` [PATCH 02/10] Make checkpoint/restart functionality modular Dave Hansen
2008-10-20 16:59 ` Serge E. Hallyn
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