tree b2cc120f870989c2cb4cdd328d0cf7f8355eb012
parent 57ab2512138205fe7836332fb4742441e53907ff
author Mike Marciniszyn <mike.marciniszyn@intel.com> 1446484405 -0500
committer Doug Ledford <dledford@redhat.com> 1449524366 -0500

IB/core: use RCU for uverbs id lookup

The current implementation gets a spin_lock, and at any scale with
qib and hfi1 post send, the lock contention grows exponentially
with the number of QPs.

idr_find() is RCU compatibile, so read doesn't need the lock.

Change to use rcu_read_lock() and rcu_read_unlock() in
__idr_get_uobj().

kfree_rcu() is used to insure a grace period between the
idr removal and actual free.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-By: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>