From 78e03d69733c48312ae81fe4ac0790dbea412b9d Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Mon, 9 Dec 2013 12:53:05 +0000
Subject: [PATCH] dm cache policy mq: introduce three promotion threshold
 tunables

Internally the mq policy maintains a promotion threshold variable.  If
the hit count of a block not in the cache goes above this threshold it
gets promoted to the cache.

This patch introduces three new tunables that allow you to tweak the
promotion threshold by adding a small value.  These adjustments depend
on the io type:

   read_promote_adjustment:    READ io, default 4
   write_promote_adjustment:   WRITE io, default 8
   discard_promote_adjustment: READ/WRITE io to a discarded block, default 1

If you're trying to quickly warm a new cache device you may wish to
reduce these to encourage promotion.  Remember to switch them back to
their defaults after the cache fills though.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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