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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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4
fs/exec.c
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@ -760,7 +760,7 @@ no_thread_group:
spin_lock(&oldsighand->siglock);
spin_lock(&newsighand->siglock);
current->sighand = newsighand;
rcu_assign_pointer(current->sighand, newsighand);
recalc_sigpending();
spin_unlock(&newsighand->siglock);
@ -768,7 +768,7 @@ no_thread_group:
write_unlock_irq(&tasklist_lock);
if (atomic_dec_and_test(&oldsighand->count))
kmem_cache_free(sighand_cachep, oldsighand);
sighand_free(oldsighand);
}
BUG_ON(!thread_group_leader(current));