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authorOleg Nesterov <oleg@tv-sign.ru>2006-03-28 16:11:12 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-28 18:36:42 -0800
commitaa1757f90bea3f598b6e5d04d922a6a60200f1da (patch)
tree4f8f3804b2595031d0b84de7086dc28375290f0d
parent1f09f9749cdde4e69f95d62d96d2e03f50b3353c (diff)
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[PATCH] convert sighand_cache to use SLAB_DESTROY_BY_RCU
This patch borrows a clever Hugh's 'struct anon_vma' trick. Without tasklist_lock held we can't trust task->sighand until we locked it and re-checked that it is still the same. But this means we don't need to defer 'kmem_cache_free(sighand)'. We can return the memory to slab immediately, all we need is to be sure that sighand->siglock can't dissapear inside rcu protected section. To do so we need to initialize ->siglock inside ctor function, SLAB_DESTROY_BY_RCU does the rest. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/exec.c3
-rw-r--r--include/linux/sched.h8
-rw-r--r--kernel/fork.c21
-rw-r--r--kernel/signal.c2
4 files changed, 13 insertions, 21 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 9046ad2b0614..950ebd43cdc3 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -768,7 +768,6 @@ no_thread_group:
/*
* Move our state over to newsighand and switch it in.
*/
- spin_lock_init(&newsighand->siglock);
atomic_set(&newsighand->count, 1);
memcpy(newsighand->action, oldsighand->action,
sizeof(newsighand->action));
@@ -785,7 +784,7 @@ no_thread_group:
write_unlock_irq(&tasklist_lock);
if (atomic_dec_and_test(&oldsighand->count))
- sighand_free(oldsighand);
+ kmem_cache_free(sighand_cachep, oldsighand);
}
BUG_ON(!thread_group_leader(current));
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ddc0df7f8bf5..bbcfc873bd98 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -355,16 +355,8 @@ struct sighand_struct {
atomic_t count;
struct k_sigaction action[_NSIG];
spinlock_t siglock;
- struct rcu_head rcu;
};
-extern void sighand_free_cb(struct rcu_head *rhp);
-
-static inline void sighand_free(struct sighand_struct *sp)
-{
- call_rcu(&sp->rcu, sighand_free_cb);
-}
-
/*
* NOTE! "signal_struct" does not have it's own
* locking, because a shared signal_struct always
diff --git a/kernel/fork.c b/kernel/fork.c
index 0c32e28cdc5f..33ffb5bf0dbc 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -786,14 +786,6 @@ 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;
@@ -806,7 +798,6 @@ static inline int copy_sighand(unsigned long clone_flags, struct task_struct * t
rcu_assign_pointer(tsk->sighand, sig);
if (!sig)
return -ENOMEM;
- spin_lock_init(&sig->siglock);
atomic_set(&sig->count, 1);
memcpy(sig->action, current->sighand->action, sizeof(sig->action));
return 0;
@@ -1356,11 +1347,21 @@ long do_fork(unsigned long clone_flags,
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif
+static void sighand_ctor(void *data, kmem_cache_t *cachep, unsigned long flags)
+{
+ struct sighand_struct *sighand = data;
+
+ if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR)
+ spin_lock_init(&sighand->siglock);
+}
+
void __init proc_caches_init(void)
{
sighand_cachep = kmem_cache_create("sighand_cache",
sizeof(struct sighand_struct), 0,
- SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+ SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU,
+ sighand_ctor, NULL);
signal_cachep = kmem_cache_create("signal_cache",
sizeof(struct signal_struct), 0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
diff --git a/kernel/signal.c b/kernel/signal.c
index dc8f91bf9f89..b0b1ca9daa33 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -330,7 +330,7 @@ void __exit_sighand(struct task_struct *tsk)
/* Ok, we're done with the signal handlers */
tsk->sighand = NULL;
if (atomic_dec_and_test(&sighand->count))
- sighand_free(sighand);
+ kmem_cache_free(sighand_cachep, sighand);
}
void exit_sighand(struct task_struct *tsk)