On Mon, 7 Apr 2014 13:45:34 +0400 Vladimir Davydov <[email protected]>
wrote:
> {un}lock_memory_hotplug, which is used to synchronize against memory
> hotplug, is currently backed by a mutex, which makes it a bit of a
> hammer - threads that only want to get a stable value of online nodes
> mask won't be able to proceed concurrently. Also, it imposes some strong
> locking ordering rules on it, which narrows down the set of its usage
> scenarios.
>
> This patch introduces get/put_online_mems, which are the same as
> get/put_online_cpus, but for memory hotplug, i.e. executing a code
> inside a get/put_online_mems section will guarantee a stable value of
> online nodes, present pages, etc.
Well that seems a nice change. I added the important paragraph
"lock_memory_hotplug()/unlock_memory_hotplug() are removed altogether."
I'll Cc a large number of people who have recently worked on the memory
hotplug code. Hopefully some of them will have time to review and test
these patches, thanks.
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