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attach_pid() with struct pid parameter

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attach_pid() currently takes a pid_t and then uses find_pid() to find the
corresponding struct pid.  Sometimes we already have the struct pid.  We can
then skip find_pid() if attach_pid() were to take a struct pid parameter.

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: <containers@lists.osdl.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sukadev Bhattiprolu 2007-05-10 22:22:58 -07:00 • committed by Linus Torvalds
parent 4ac24b3ba9
commit e713d0dab2
6 changed files with 18 additions and 13 deletions
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11
kernel/fork.c
View file

@ -1249,16 +1249,19 @@ static struct task_struct *copy_process(unsigned long clone_flags,
__ptrace_link(p, current->parent);
if (thread_group_leader(p)) {
pid_t pgid = process_group(current);
pid_t sid = process_session(current);
p->signal->tty = current->signal->tty;
p->signal->pgrp = process_group(current);
p->signal->pgrp = pgid;
set_signal_session(p->signal, process_session(current));
attach_pid(p, PIDTYPE_PGID, process_group(p));
attach_pid(p, PIDTYPE_SID, process_session(p));
attach_pid(p, PIDTYPE_PGID, find_pid(pgid));
attach_pid(p, PIDTYPE_SID, find_pid(sid));
list_add_tail_rcu(&p->tasks, &init_task.tasks);
__get_cpu_var(process_counts)++;
}
attach_pid(p, PIDTYPE_PID, p->pid);
attach_pid(p, PIDTYPE_PID, find_pid(p->pid));
nr_threads++;
}