Re: [PATCH] vxlan: using hash_lock to protect one budegt in vxlan_flush

[David Miller]

From: Litao Jiao <jiaolitao@xxxxxxxxxxxx>
Date: Thu, 11 Apr 2019 15:06:09 +0800

> The hash_lock will hold long time in vxlan_flush when stopping the
> vxlan device in which there has lots of vxlan fdb entries;it would
> affect the bh process in local cpu; and other cpu would wait for
> a long time in vxlan_snoop until the hash_lock is released;so
> using hash_lock to protect one budegt in vxlan_flush could
> reduce the continuous holding time of the lock.
> 
> Signed-off-by: Litao Jiao <jiaolitao@xxxxxxxxxxxx>

Now you are doing FDB_HASH_SIZE spin lock/unlock sequences.

There has to be a better way.