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[PATCH] RCU signal handling

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RCU tasklist_lock and RCU signal handling: send signals RCU-read-locked
instead of tasklist_lock read-locked.  This is a scalability improvement on
SMP and a preemption-latency improvement under PREEMPT_RCU.

Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: William Irwin <wli@holomorphy.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-01-08 01:01:37 -08:00 • committed by Linus Torvalds
parent 4369ef3c3e
commit e56d090310
8 changed files with 143 additions and 31 deletions
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10
kernel/fork.c
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@ -743,6 +743,14 @@ int unshare_files(void)
EXPORT_SYMBOL(unshare_files);
void sighand_free_cb(struct rcu_head *rhp)
{
struct sighand_struct *sp;
sp = container_of(rhp, struct sighand_struct, rcu);
kmem_cache_free(sighand_cachep, sp);
}
static inline int copy_sighand(unsigned long clone_flags, struct task_struct * tsk)
{
struct sighand_struct *sig;
@ -752,7 +760,7 @@ static inline int copy_sighand(unsigned long clone_flags, struct task_struct * t
return 0;
}
sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL);
tsk->sighand = sig;
rcu_assign_pointer(tsk->sighand, sig);
if (!sig)
return -ENOMEM;
spin_lock_init(&sig->siglock);