AcoSail/kernel_optimize_test
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Change reparent_to_init to reparent_to_kthreadd

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When a kernel thread calls daemonize, instead of reparenting the thread to
init reparent the thread to kthreadd next to the threads created by
kthread_create.

This is really just a stop gap until daemonize goes away, but it does
ensure no kernel threads are under init and they are all in one place that
is easy to find.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric W. Biederman 2007-05-09 02:34:33 -07:00 committed by Linus Torvalds
parent 73c279927f
commit 49d769d52e
1 changed files with 8 additions and 8 deletions
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16
kernel/exit.c
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@ -26,6 +26,7 @@
#include <linux/profile.h>
#include <linux/mount.h>
#include <linux/proc_fs.h>
#include <linux/kthread.h>
#include <linux/mempolicy.h>
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
@ -254,26 +255,25 @@ static int has_stopped_jobs(struct pid *pgrp)
}
/**
* reparent_to_init - Reparent the calling kernel thread to the init task of the pid space that the thread belongs to.
* reparent_to_kthreadd - Reparent the calling kernel thread to kthreadd
*
* If a kernel thread is launched as a result of a system call, or if
* it ever exits, it should generally reparent itself to init so that
* it is correctly cleaned up on exit.
* it ever exits, it should generally reparent itself to kthreadd so it
* isn't in the way of other processes and is correctly cleaned up on exit.
*
* The various task state such as scheduling policy and priority may have
* been inherited from a user process, so we reset them to sane values here.
*
* NOTE that reparent_to_init() gives the caller full capabilities.
* NOTE that reparent_to_kthreadd() gives the caller full capabilities.
*/
static void reparent_to_init(void)
static void reparent_to_kthreadd(void)
{
write_lock_irq(&tasklist_lock);
ptrace_unlink(current);
/* Reparent to init */
remove_parent(current);
current->parent = child_reaper(current);
current->real_parent = child_reaper(current);
current->real_parent = current->parent = kthreadd_task;
add_parent(current);
/* Set the exit signal to SIGCHLD so we signal init on exit */
@ -400,7 +400,7 @@ void daemonize(const char *name, ...)
current->files = init_task.files;
atomic_inc(&current->files->count);
reparent_to_init();
reparent_to_kthreadd();
}
EXPORT_SYMBOL(daemonize);