From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 13 Feb 2015 13:27:08 +0000 (-0500)
Subject: dm crypt: add 'submit_from_crypt_cpus' option
X-Git-Tag: fixes-v4.0-rc1~28^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f5d8e6ee758f7023e4353cca75d785b2d4f6abe;p=pandora-kernel.git

dm crypt: add 'submit_from_crypt_cpus' option

Make it possible to disable offloading writes by setting the optional
'submit_from_crypt_cpus' table argument.

There are some situations where offloading write bios from the
encryption threads to a single thread degrades performance
significantly.

The default is to offload write bios to the same thread because it
benefits CFQ to have writes submitted using the same IO context.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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