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authorIngo Molnar <mingo@elte.hu>2006-01-08 04:01:37 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 23:13:40 -0500
commite56d090310d7625ecb43a1eeebd479f04affb48b (patch)
tree2f479215dff4a2d8f3a9ed85200a5bc4f51534be /fs/exec.c
parent4369ef3c3e9d3bd9b879580678778f558d481e90 (diff)
[PATCH] RCU signal handling
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>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/exec.c b/fs/exec.c
index e75a9548da8e..e9650cd22a3b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -760,7 +760,7 @@ no_thread_group:
760 spin_lock(&oldsighand->siglock); 760 spin_lock(&oldsighand->siglock);
761 spin_lock(&newsighand->siglock); 761 spin_lock(&newsighand->siglock);
762 762
763 current->sighand = newsighand; 763 rcu_assign_pointer(current->sighand, newsighand);
764 recalc_sigpending(); 764 recalc_sigpending();
765 765
766 spin_unlock(&newsighand->siglock); 766 spin_unlock(&newsighand->siglock);
@@ -768,7 +768,7 @@ no_thread_group:
768 write_unlock_irq(&tasklist_lock); 768 write_unlock_irq(&tasklist_lock);
769 769
770 if (atomic_dec_and_test(&oldsighand->count)) 770 if (atomic_dec_and_test(&oldsighand->count))
771 kmem_cache_free(sighand_cachep, oldsighand); 771 sighand_free(oldsighand);
772 } 772 }
773 773
774 BUG_ON(!thread_group_leader(current)); 774 BUG_ON(!thread_group_leader(current));