[Devel] Re: [PATCH 0/6] /proc/pid/checkpointable

[Oren Laadan]

Sukadev Bhattiprolu wrote:
> From: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
> Date: Sat, 14 Mar 2009 10:21:07 -0700
> Subject: [PATCH 6/6] Explain reason for task being uncheckpointable
> 
> Try to give an useful message on why a task is uncheckpointable.
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
> ---
>  checkpoint/checkpoint.c    |   13 +++++++++----
>  fs/proc/base.c             |   19 ++++++++++++++++++-
>  include/linux/checkpoint.h |    7 +++++++
>  3 files changed, 34 insertions(+), 5 deletions(-)
> 

[...]

>  #ifdef CONFIG_CHECKPOINT_RESTART
> +static char *explain_checkpointable(int reason)
> +{
> +	char *message;
> +
> +	switch(reason) {
> +	case CR_CHECKPOINTABLE: message = "1"; break;
> +	case CR_DEAD: 		message = "0 (dead)"; break;
> +	case CR_NOT_FROZEN: 	message = "0 (not frozen)"; break;

Hmmm... so a task cannot test if it itself is checkpointable, because
it will never be frozen and will fail right there before proceeding to
addition (future) tests ?

[...]

Oren.


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