Messages in this thread | | | Date | Fri, 17 Feb 2006 19:27:37 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: [PATCH] convert sighand_cache to use SLAB_DESTROY_BY_RCU |
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On Fri, 17 Feb 2006, Oleg Nesterov wrote: > 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.
Yes, that looks a good use of SLAB_DESTROY_BY_RCU to me: thanks!
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