[PATCH] pids: kill PIDTYPE_TGID
commit47e65328a7b1cdfc4e3102e50d60faf94ebba7d3
authorOleg Nesterov <oleg@tv-sign.ru>
Wed, 29 Mar 2006 00:11:25 +0000 (28 16:11 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Wed, 29 Mar 2006 02:36:44 +0000 (28 18:36 -0800)
tree78e00a5321cca87767806a91e623e71b5c6637c7
parent88531f725bd52e37a7be726860e4ff3f09031d89
[PATCH] pids: kill PIDTYPE_TGID

This patch kills PIDTYPE_TGID pid_type thus saving one hash table in
kernel/pid.c and speeding up subthreads create/destroy a bit.  It is also a
preparation for the further tref/pids rework.

This patch adds 'struct list_head thread_group' to 'struct task_struct'
instead.

We don't detach group leader from PIDTYPE_PID namespace until another
thread inherits it's ->pid == ->tgid, so we are safe wrt premature
free_pidmap(->tgid) call.

Currently there are no users of find_task_by_pid_type(PIDTYPE_TGID).
Should the need arise, we can use find_task_by_pid()->group_leader.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-By: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
include/linux/pid.h
include/linux/sched.h
kernel/exit.c
kernel/fork.c