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Subject[PATCH v2 0/1] multi-threading device shutdown

v1 - v2
- It turns out we cannot lock more than MAX_LOCK_DEPTH by a single
thread. (By default this value is 48), and is used to detect
deadlocks. So, I re-wrote the code to only lock one devices per
thread instead of pre-locking all devices by the main thread.
- Addressed comments from Tobin C. Harding.
- As suggested by Alexander Duyck removed ixgbe changes. It can be
done as a separate work scaling RTNL mutex.

Do a faster shutdown by calling dev->*->shutdown(dev) in parallel.
device_shutdown() calls these functions for every single device but
only using one thread.

Since, nothing else is running on the machine by the device_shutdown()
s called, there is no reason not to utilize all the available CPU

Pavel Tatashin (1):
drivers core: multi-threading device shutdown

drivers/base/core.c | 275 ++++++++++++++++++++++++++++++++++++--------
1 file changed, 225 insertions(+), 50 deletions(-)


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