From: David Vrabel <david.vrabel@citrix.com>
Date: Fri, 19 Jul 2013 14:52:00 +0000 (+0100)
Subject: xen/evtchn: improve scalability by using per-user locks
X-Git-Tag: v3.12-rc1~144^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=73cc4bb0c79eebe1f0e92b700d9fe8d1c9b061bb;p=pandora-kernel.git

xen/evtchn: improve scalability by using per-user locks

The global array of port users and the port_user_lock limits
scalability of the evtchn device.  Instead of the global array lookup,
use a per-use (per-fd) tree of event channels bound by that user and
protect the tree with a per-user lock.

This is also a prerequiste for extended the number of supported event
channels, by removing the fixed size, per-event channel array.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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