[PATCH][usercr]: Ghost tasks must be detached
Sukadev Bhattiprolu
sukadev at linux.vnet.ibm.com
Thu Feb 24 23:58:08 PST 2011
Oren can you please revert this usercr patch, as we discussed earlier :-)
I have sent a separate kernel patch.
Sukadev
Sukadev Bhattiprolu [sukadev at linux.vnet.ibm.com] wrote:
|
| From: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
| Date: Fri, 10 Dec 2010 19:23:58 -0800
| Subject: [PATCH 1/1] Ghost tasks must be detached
|
| Ghost processes are created only to help restore orphaned sessions/pgrps.
| As such once the session/pgrp is created the ghost must not send another
| SIGCHLD to the parent but exit silently. So create such tasks as
| "detached".
|
| See also:
|
| https://lists.linux-foundation.org/pipermail/containers/2010-December/026076.html
|
| Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
| ---
| restart.c | 7 +++++++
| 1 files changed, 7 insertions(+), 0 deletions(-)
|
| diff --git a/restart.c b/restart.c
| index 9fb5e9f..d7ba26b 100644
| --- a/restart.c
| +++ b/restart.c
| @@ -1744,6 +1744,13 @@ static pid_t ckpt_fork_child(struct ckpt_ctx *ctx, struct task *child)
| flags |= CLONE_THREAD | CLONE_SIGHAND | CLONE_VM;
| else if (child->flags & TASK_SIBLING)
| flags |= CLONE_PARENT;
| + else if (child->flags & (TASK_GHOST|TASK_DEAD)) {
| + /*
| + * Ghosts must vanish silently (without signalling parent)
| + * when they are done.
| + */
| + flags = 0xFF;
| + }
|
| memset(&clone_args, 0, sizeof(clone_args));
| clone_args.nr_pids = 1;
| --
| 1.6.0.4
|
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