From: Jeff Moyer <jmoyer@redhat.com>
Date: Wed, 5 Dec 2012 19:17:21 +0000 (+0100)
Subject: bdi: add a user-tunable cpu_list for the bdi flusher threads
X-Git-Tag: v3.8-rc1~81^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8fa72d234da9b6b473bbb1f74d533663e4996e6b;p=pandora-kernel.git

bdi: add a user-tunable cpu_list for the bdi flusher threads

In realtime environments, it may be desirable to keep the per-bdi
flusher threads from running on certain cpus.  This patch adds a
cpu_list file to /sys/class/bdi/* to enable this.  The default is to tie
the flusher threads to the same numa node as the backing device (though
I could be convinced to make it a mask of all cpus to avoid a change in
behaviour).

Thanks to Jeremy Eder for the original idea.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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