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From: Daniel Jacobowitz <dan@debian.org>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Oren Laadan <orenl@cs.columbia.edu>,
	linux-api@vger.kernel.org, containers@lists.linux-foundation.org,
	mingo@elte.hu, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	viro@zeniv.linux.org.uk, hpa@zytor.com,
	Andrew Morton <akpm@linux-foundation.org>,
	torvalds@linux-foundation.org, tglx@linutronix.de
Subject: Re: [RFC v7][PATCH 2/9] General infrastructure for checkpoint restart
Date: Wed, 22 Oct 2008 10:29:07 -0400	[thread overview]
Message-ID: <20081022142907.GA13574@caradoc.them.org> (raw)
In-Reply-To: <1224644563.1848.232.camel@nimitz>

On Tue, Oct 21, 2008 at 08:02:43PM -0700, Dave Hansen wrote:
> Let's say you have a process you want to checkpoint.  If it uses a
> completely discrete IPC namespace, you *know* that nothing else depends
> on those IPC ids.  We don't even have to worry about who might have been
> using them and when.
> 
> Also think about pids.  Without containers, how can you guarantee a
> restarted process that it can regain the same pid?

OK, that makes sense.  In a lot of simple cases you can get by without
regaining the same pid; there's an implementation of checkpointing in
GDB that works by injecting fork calls into the child, and it is
useful for a reasonable selection of single-threaded programs.

-- 
Daniel Jacobowitz
CodeSourcery

  reply	other threads:[~2008-10-22 14:29 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-20  5:40 [RFC v7][PATCH 0/9] Kernel based checkpoint/restart Oren Laadan
2008-10-20  5:40 ` [RFC v7][PATCH 1/9] Create syscalls: sys_checkpoint, sys_restart Oren Laadan
2008-10-20  5:40 ` [RFC v7][PATCH 2/9] General infrastructure for checkpoint restart Oren Laadan
2008-10-21 19:41   ` Andrew Morton
2008-10-21 20:24     ` Serge E. Hallyn
2008-10-21 20:41       ` Andrew Morton
2008-10-22  1:33       ` Oren Laadan
2008-10-22  2:55         ` Daniel Jacobowitz
2008-10-22  3:02           ` Dave Hansen
2008-10-22 14:29             ` Daniel Jacobowitz [this message]
2008-10-22 15:28         ` Serge E. Hallyn
2008-10-22 16:02           ` Oren Laadan
2008-10-22 17:03             ` Serge E. Hallyn
2008-10-22 18:32               ` Oren Laadan
2008-10-27  8:27             ` Peter Chubb
2008-10-27 11:03               ` Oren Laadan
2008-10-27 16:42                 ` Dave Hansen
2008-10-27 17:11                   ` Oren Laadan
2008-10-27 20:51                     ` Matt Helsley
2008-10-27 21:20                       ` Serge E. Hallyn
2008-10-27 21:51                       ` Oren Laadan
2008-10-27 22:09                         ` Dave Hansen
2008-10-28 18:33                           ` Serge E. Hallyn
2008-10-20  5:40 ` [RFC v7][PATCH 3/9] x86 support for checkpoint/restart Oren Laadan
2008-10-20  5:40 ` [RFC v7][PATCH 4/9] Dump memory address space Oren Laadan
2008-10-20  5:40 ` [RFC v7][PATCH 5/9] Restore " Oren Laadan
2008-10-20  5:40 ` [RFC v7][PATCH 6/9] Checkpoint/restart: initial documentation Oren Laadan
2008-10-28 16:48   ` Michael Kerrisk
2008-10-20  5:40 ` [RFC v7][PATCH 7/9] Infrastructure for shared objects Oren Laadan
2008-10-20  5:40 ` [RFC v7][PATCH 8/9] Dump open file descriptors Oren Laadan
2008-10-20  5:40 ` [RFC v7][PATCH 9/9] Restore open file descriprtors Oren Laadan
2008-10-21 19:21 ` [RFC v7][PATCH 0/9] Kernel based checkpoint/restart Andrew Morton
2008-10-21 20:41   ` Dave Hansen
2008-10-22  9:20     ` Ingo Molnar
2008-10-22 11:51       ` Daniel Lezcano

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