Messages in this thread | | | Date | Mon, 26 Nov 2007 18:02:01 +0300 | From | Pavel Emelyanov <> | Subject | Re: [PATCH 2/3] teach set_special_pids() to use struct pid |
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Oleg Nesterov wrote: > Change set_special_pids() to work with struct pid, not pid_t from global name > space. This again speedups and imho cleanups the code. > > Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
> --- PT/include/linux/sched.h~2_set_special_pids 2007-11-26 15:52:15.000000000 +0300 > +++ PT/include/linux/sched.h 2007-11-26 16:47:35.000000000 +0300 > @@ -1568,7 +1568,7 @@ extern struct task_struct *find_task_by_ > extern struct task_struct *find_task_by_pid_ns(pid_t nr, > struct pid_namespace *ns); > > -extern void __set_special_pids(pid_t session, pid_t pgrp); > +extern void __set_special_pids(struct pid *pid); > > /* per-UID process charging. */ > extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); > --- PT/kernel/exit.c~2_set_special_pids 2007-11-26 15:52:15.000000000 +0300 > +++ PT/kernel/exit.c 2007-11-26 16:47:35.000000000 +0300 > @@ -295,26 +295,27 @@ static void reparent_to_kthreadd(void) > switch_uid(INIT_USER); > } > > -void __set_special_pids(pid_t session, pid_t pgrp) > +void __set_special_pids(struct pid *pid) > { > struct task_struct *curr = current->group_leader; > + pid_t nr = pid_nr(pid); > > - if (task_session_nr(curr) != session) { > + if (task_session(curr) != pid) { > detach_pid(curr, PIDTYPE_SID); > - set_task_session(curr, session); > - attach_pid(curr, PIDTYPE_SID, find_pid(session)); > + attach_pid(curr, PIDTYPE_SID, pid); > + set_task_session(curr, nr); > } > - if (task_pgrp_nr(curr) != pgrp) { > + if (task_pgrp(curr) != pid) { > detach_pid(curr, PIDTYPE_PGID); > - set_task_pgrp(curr, pgrp); > - attach_pid(curr, PIDTYPE_PGID, find_pid(pgrp)); > + attach_pid(curr, PIDTYPE_PGID, pid); > + set_task_pgrp(curr, nr); > } > } > > -static void set_special_pids(pid_t session, pid_t pgrp) > +static void set_special_pids(struct pid *pid) > { > write_lock_irq(&tasklist_lock); > - __set_special_pids(session, pgrp); > + __set_special_pids(pid); > write_unlock_irq(&tasklist_lock); > } > > @@ -385,7 +386,11 @@ void daemonize(const char *name, ...) > */ > current->flags |= PF_NOFREEZE; > > - set_special_pids(1, 1); > + if (current->nsproxy != &init_nsproxy) { > + get_nsproxy(&init_nsproxy); > + switch_task_namespaces(current, &init_nsproxy); > + } > + set_special_pids(find_pid(1)); > proc_clear_tty(current); > > /* Block and flush all signals */ > @@ -400,11 +405,6 @@ void daemonize(const char *name, ...) > current->fs = fs; > atomic_inc(&fs->count); > > - if (current->nsproxy != init_task.nsproxy) { > - get_nsproxy(init_task.nsproxy); > - switch_task_namespaces(current, init_task.nsproxy); > - } > - > exit_files(current); > current->files = init_task.files; > atomic_inc(¤t->files->count); > --- PT/kernel/sys.c~2_set_special_pids 2007-11-26 16:10:43.000000000 +0300 > +++ PT/kernel/sys.c 2007-11-26 16:48:02.000000000 +0300 > @@ -1065,7 +1065,7 @@ asmlinkage long sys_setsid(void) > goto out; > > group_leader->signal->leader = 1; > - __set_special_pids(pid_nr(sid), pid_nr(sid)); > + __set_special_pids(sid); > > spin_lock(&group_leader->sighand->siglock); > group_leader->signal->tty = NULL; > --- PT/init/main.c~2_set_special_pids 2007-11-26 15:52:15.000000000 +0300 > +++ PT/init/main.c 2007-11-26 16:56:24.000000000 +0300 > @@ -829,7 +829,7 @@ static int __init kernel_init(void * unu > */ > init_pid_ns.child_reaper = current; > > - __set_special_pids(1, 1); > + __set_special_pids(task_pid(current)); > cad_pid = task_pid(current); > > smp_prepare_cpus(max_cpus); > >
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