From: Alexey Dobriyan <adobriyan@gmail.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
linux-api@vger.kernel.org, containers@lists.linux-foundation.org,
hpa@zytor.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
viro@zeniv.linux.org.uk, mpm@selenic.com, tglx@linutronix.de,
torvalds@linux-foundation.org, xemul@openvz.org,
Nathan Lynch <nathanl@austin.ibm.com>
Subject: Re: What can OpenVZ do?
Date: Wed, 18 Feb 2009 08:11:23 +0300 [thread overview]
Message-ID: <20090218051123.GA9367@x200.localdomain> (raw)
In-Reply-To: <1234917639.4816.12.camel@nimitz>
On Tue, Feb 17, 2009 at 04:40:39PM -0800, Dave Hansen wrote:
> On Wed, 2009-02-18 at 01:32 +0100, Ingo Molnar wrote:
> > > > Uncheckpointable should be a one-way flag anyway. We want this
> > > > to become usable, so uncheckpointable functionality should be as
> > > > painful as possible, to make sure it's getting fixed ...
> > >
> > > Again, as these patches stand, we don't support checkpointing
> > > when non-simple files are opened. Basically, if a
> > > open()/lseek() pair won't get you back where you were, we
> > > don't deal with them.
> > >
> > > init does non-checkpointable things. If the flag is a one-way
> > > trip, we'll never be able to checkpoint because we'll always
> > > inherit init's ! checkpointable flag.
> > >
> > > To fix this, we could start working on making sure we can
> > > checkpoint init, but that's practically worthless.
> >
> > i mean, it should be per process (per app) one-way flag of
> > course. If the app does something unsupported, it gets
> > non-checkpointable and that's it.
>
> OK, we can definitely do that. Do you think it is OK to run through a
> set of checks at exec() time to check if the app currently has any
> unsupported things going on? If we don't directly inherit the parent's
> status, then we need to have *some* time when we check it.
Uncheckpointable is not one-way.
Imagine remap_file_pages(2) is unsupported. Now app uses
remap_file_pages(2), then unmaps interesting VMA. Now app is
checkpointable again.
As for overloading LSM, I think, it would be horrible.
Most hooks are useless, there are config options expanding LSM hooks,
and CPT and LSM are just totally orthogonal.
Instead, just (no offence) get big enough coverage -- run modern and
past distros, run servers packaged with them, and if you can checkpoint
all of this, you're mostly fine.
next prev parent reply other threads:[~2009-02-18 5:05 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-27 17:07 [RFC v13][PATCH 00/14] Kernel based checkpoint/restart Oren Laadan
2009-01-27 17:07 ` [RFC v13][PATCH 01/14] Create syscalls: sys_checkpoint, sys_restart Oren Laadan
2009-01-27 17:20 ` Randy Dunlap
2009-01-27 17:08 ` [RFC v13][PATCH 02/14] Checkpoint/restart: initial documentation Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 03/14] Make file_pos_read/write() public Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 04/14] General infrastructure for checkpoint restart Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 05/14] x86 support for checkpoint/restart Oren Laadan
2009-02-24 7:47 ` Nathan Lynch
2009-02-24 16:06 ` Dave Hansen
2009-03-18 7:21 ` Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 06/14] Dump memory address space Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 07/14] Restore " Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 08/14] Infrastructure for shared objects Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 09/14] Dump open file descriptors Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 10/14] Restore open file descriprtors Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 11/14] External checkpoint of a task other than ourself Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 12/14] Track in-kernel when we expect checkpoint/restart to work Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 13/14] Checkpoint multiple processes Oren Laadan
2009-01-27 17:08 ` [RFC v13][PATCH 14/14] Restart " Oren Laadan
2009-02-10 17:05 ` [RFC v13][PATCH 00/14] Kernel based checkpoint/restart Dave Hansen
2009-02-11 22:14 ` Andrew Morton
2009-02-12 9:17 ` Ingo Molnar
2009-02-12 18:11 ` Dave Hansen
2009-02-12 20:48 ` Serge E. Hallyn
2009-02-13 10:20 ` Ingo Molnar
2009-02-12 18:11 ` Dave Hansen
2009-02-12 19:30 ` Matt Mackall
2009-02-12 19:42 ` Andrew Morton
2009-02-12 21:51 ` What can OpenVZ do? Dave Hansen
2009-02-12 22:10 ` Andrew Morton
2009-02-12 23:04 ` How much of a mess does OpenVZ make? ;) Was: " Dave Hansen
2009-02-26 15:57 ` Alexey Dobriyan
2009-03-10 21:53 ` Alexey Dobriyan
2009-03-10 23:28 ` Serge E. Hallyn
2009-03-11 8:26 ` Cedric Le Goater
2009-03-12 14:53 ` Serge E. Hallyn
2009-03-12 21:01 ` Greg Kurz
2009-03-12 21:21 ` Serge E. Hallyn
2009-03-13 4:29 ` Ying Han
2009-03-13 5:34 ` Sukadev Bhattiprolu
2009-03-13 6:19 ` Ying Han
2009-03-13 17:27 ` Linus Torvalds
2009-03-13 19:02 ` Serge E. Hallyn
2009-03-13 19:35 ` Alexey Dobriyan
2009-03-13 21:01 ` Linus Torvalds
2009-03-13 21:51 ` Dave Hansen
2009-03-13 22:15 ` Oren Laadan
2009-03-14 0:27 ` Eric W. Biederman
2009-03-14 8:12 ` Ingo Molnar
2009-03-16 22:33 ` Kevin Fox
2009-03-19 21:19 ` Eric W. Biederman
2009-03-14 0:20 ` Alexey Dobriyan
2009-03-14 8:25 ` Ingo Molnar
2009-03-16 6:01 ` Oren Laadan
2009-03-13 20:48 ` Mike Waychison
2009-03-13 22:35 ` Oren Laadan
2009-03-18 18:54 ` Mike Waychison
2009-03-18 19:04 ` Oren Laadan
2009-03-13 15:27 ` Cedric Le Goater
2009-03-13 17:11 ` Greg Kurz
2009-03-13 17:37 ` Serge E. Hallyn
2009-03-13 15:47 ` Cedric Le Goater
2009-03-13 16:35 ` Serge E. Hallyn
2009-03-13 16:53 ` Cedric Le Goater
2009-02-26 16:27 ` Alexey Dobriyan
2009-02-26 17:33 ` Ingo Molnar
2009-02-26 18:30 ` Greg Kurz
2009-02-26 22:17 ` Alexey Dobriyan
2009-02-27 9:19 ` Greg Kurz
2009-02-27 10:53 ` Alexey Dobriyan
2009-02-27 14:33 ` Cedric Le Goater
2009-02-27 9:36 ` Cedric Le Goater
2009-02-26 22:31 ` Alexey Dobriyan
2009-02-27 9:03 ` Ingo Molnar
2009-02-27 9:19 ` Andrew Morton
2009-02-27 10:57 ` Alexey Dobriyan
2009-02-27 9:22 ` Andrew Morton
2009-02-27 10:59 ` Alexey Dobriyan
2009-02-27 16:14 ` Dave Hansen
2009-02-27 21:57 ` Alexey Dobriyan
2009-02-27 21:54 ` Dave Hansen
2009-03-01 1:33 ` Alexey Dobriyan
2009-03-01 20:02 ` Serge E. Hallyn
2009-03-01 20:56 ` Alexey Dobriyan
2009-03-01 22:21 ` Serge E. Hallyn
2009-03-03 16:17 ` Cedric Le Goater
2009-03-03 18:28 ` Serge E. Hallyn
2009-02-13 10:53 ` Ingo Molnar
2009-02-16 20:51 ` Dave Hansen
2009-02-17 22:23 ` Ingo Molnar
2009-02-17 22:30 ` Dave Hansen
2009-02-18 0:32 ` Ingo Molnar
2009-02-18 0:40 ` Dave Hansen
2009-02-18 5:11 ` Alexey Dobriyan [this message]
2009-02-18 18:16 ` Ingo Molnar
2009-02-18 21:27 ` Dave Hansen
2009-02-18 23:15 ` Ingo Molnar
2009-02-19 19:06 ` Banning checkpoint (was: Re: What can OpenVZ do?) Alexey Dobriyan
2009-02-19 19:11 ` Dave Hansen
2009-02-24 4:47 ` Alexey Dobriyan
2009-02-24 5:11 ` Dave Hansen
2009-02-24 15:43 ` Serge E. Hallyn
2009-02-24 20:09 ` Alexey Dobriyan
2009-02-12 22:17 ` What can OpenVZ do? Alexey Dobriyan
2009-02-13 10:27 ` Ingo Molnar
2009-02-13 11:32 ` Alexey Dobriyan
2009-02-13 11:45 ` Ingo Molnar
2009-02-13 22:28 ` Alexey Dobriyan
2009-03-14 0:04 ` Eric W. Biederman
2009-03-14 0:26 ` Serge E. Hallyn
2009-02-12 22:57 ` [RFC v13][PATCH 00/14] Kernel based checkpoint/restart Dave Hansen
2009-02-12 23:05 ` Matt Mackall
2009-02-12 23:13 ` Dave Hansen
2009-02-13 23:28 ` Andrew Morton
2009-02-14 23:08 ` Ingo Molnar
2009-02-14 23:31 ` Andrew Morton
2009-02-14 23:50 ` Ingo Molnar
2009-02-16 17:37 ` Dave Hansen
2009-03-13 2:45 ` Oren Laadan
2009-03-13 3:57 ` Oren Laadan
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