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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-03-29 02:11:12 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-29 04:36:42 +0200 |
| commit | aa1757f90bea3f598b6e5d04d922a6a60200f1da (patch) | |
| tree | 4f8f3804b2595031d0b84de7086dc28375290f0d /include | |
| parent | [PATCH] release_task: replace open-coded ptrace_unlink() (diff) | |
| download | linux-aa1757f90bea3f598b6e5d04d922a6a60200f1da.tar.xz linux-aa1757f90bea3f598b6e5d04d922a6a60200f1da.zip | |
[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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched.h | 8 |
1 files changed, 0 insertions, 8 deletions
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 |