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Message-ID: <20071207170336.GA13835@tv-sign.ru>
Date: Fri, 7 Dec 2007 20:03:36 +0300
From: Oleg Nesterov <oleg@...sign.ru>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
Davide Libenzi <davidel@...ilserver.org>,
Pavel Emelyanov <xemul@...nvz.org>,
Roland McGrath <roland@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org
Subject: [PATCH] ITIMER_REAL: convert to use struct pid
signal_struct->tsk points to the ->group_leader and thus we have the nasty code
in de_thread() which has to change it and restart ->real_timer if the leader is
changed.
Use "struct pid *leader_pid" instead. This also allows us to kill now unneeded
send_group_sig_info().
Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
include/linux/sched.h | 3 +--
kernel/fork.c | 2 +-
kernel/itimer.c | 2 +-
fs/exec.c | 22 ++--------------------
kernel/signal.c | 14 --------------
5 files changed, 5 insertions(+), 38 deletions(-)
--- PT/include/linux/sched.h~3_itimer_tsk_pid 2007-12-02 14:53:29.000000000 +0300
+++ PT/include/linux/sched.h 2007-12-07 19:24:44.000000000 +0300
@@ -444,7 +444,7 @@ struct signal_struct {
/* ITIMER_REAL timer for the process */
struct hrtimer real_timer;
- struct task_struct *tsk;
+ struct pid *leader_pid;
ktime_t it_real_incr;
/* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
@@ -1630,7 +1630,6 @@ extern void block_all_signals(int (*noti
extern void unblock_all_signals(void);
extern void release_task(struct task_struct * p);
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
-extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
extern int force_sigsegv(int, struct task_struct *);
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
--- PT/kernel/fork.c~3_itimer_tsk_pid 2007-12-07 19:03:34.000000000 +0300
+++ PT/kernel/fork.c 2007-12-07 19:08:57.000000000 +0300
@@ -882,7 +882,6 @@ static int copy_signal(unsigned long clo
hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
sig->it_real_incr.tv64 = 0;
sig->real_timer.function = it_real_fn;
- sig->tsk = tsk;
sig->it_virt_expires = cputime_zero;
sig->it_virt_incr = cputime_zero;
@@ -1300,6 +1299,7 @@ static struct task_struct *copy_process(
if (clone_flags & CLONE_NEWPID)
p->nsproxy->pid_ns->child_reaper = p;
+ p->signal->leader_pid = pid;
p->signal->tty = current->signal->tty;
set_task_pgrp(p, task_pgrp_nr(current));
set_task_session(p, task_session_nr(current));
--- PT/kernel/itimer.c~3_itimer_tsk_pid 2007-10-25 16:22:12.000000000 +0400
+++ PT/kernel/itimer.c 2007-12-07 19:15:27.000000000 +0300
@@ -132,7 +132,7 @@ enum hrtimer_restart it_real_fn(struct h
struct signal_struct *sig =
container_of(timer, struct signal_struct, real_timer);
- send_group_sig_info(SIGALRM, SEND_SIG_PRIV, sig->tsk);
+ kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
return HRTIMER_NORESTART;
}
--- PT/fs/exec.c~3_itimer_tsk_pid 2007-12-02 16:07:22.000000000 +0300
+++ PT/fs/exec.c 2007-12-07 19:18:48.000000000 +0300
@@ -781,26 +781,8 @@ static int de_thread(struct task_struct
zap_other_threads(tsk);
read_unlock(&tasklist_lock);
- /*
- * Account for the thread group leader hanging around:
- */
- count = 1;
- if (!thread_group_leader(tsk)) {
- count = 2;
- /*
- * The SIGALRM timer survives the exec, but needs to point
- * at us as the new group leader now. We have a race with
- * a timer firing now getting the old leader, so we need to
- * synchronize with any firing (by calling del_timer_sync)
- * before we can safely let the old group leader die.
- */
- sig->tsk = tsk;
- spin_unlock_irq(lock);
- if (hrtimer_cancel(&sig->real_timer))
- hrtimer_restart(&sig->real_timer);
- spin_lock_irq(lock);
- }
-
+ /* Account for the thread group leader hanging around: */
+ count = thread_group_leader(tsk) ? 1 : 2;
sig->notify_count = count;
while (atomic_read(&sig->count) > count) {
__set_current_state(TASK_UNINTERRUPTIBLE);
--- PT/kernel/signal.c~3_itimer_tsk_pid 2007-12-07 17:20:27.000000000 +0300
+++ PT/kernel/signal.c 2007-12-07 19:23:40.000000000 +0300
@@ -1204,20 +1204,6 @@ send_sig(int sig, struct task_struct *p,
return send_sig_info(sig, __si_special(priv), p);
}
-/*
- * This is the entry point for "process-wide" signals.
- * They will go to an appropriate thread in the thread group.
- */
-int
-send_group_sig_info(int sig, struct siginfo *info, struct task_struct *p)
-{
- int ret;
- read_lock(&tasklist_lock);
- ret = group_send_sig_info(sig, info, p);
- read_unlock(&tasklist_lock);
- return ret;
-}
-
void
force_sig(int sig, struct task_struct *p)
{
--
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