From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Date: Thu, 12 Dec 2013 16:03:48 +0000 (+0100)
Subject: s390/cpum_sf: Dynamically extend the sampling buffer if overflows occur
X-Git-Tag: v3.14-rc1~184^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=69f239ed335a4b03265cae3ca930f3f166e42e35;p=pandora-kernel.git

s390/cpum_sf: Dynamically extend the sampling buffer if overflows occur

Improve the sampling buffer allocation and add a function to reallocate and
increase the sampling buffer structure.  The number of allocated buffer elements
(sample-data-blocks) are accounted.  You can control the minimum and maximum
number these sample-data-blocks through the cpum_sfb_size kernel parameter.

The number hardware sample overflows (if any) are also accounted and stored
per perf event.  During the PMU disable/enable calls, the accumulated overflow
counter is analyzed and, if necessary, the sampling buffer is dynamically
increased.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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