Messages in this thread | | | Date | Thu, 2 Oct 2014 07:51:24 +0100 | From | Matt Fleming <> | Subject | Re: [PATCH v2 00/11] perf: Intel Cache QoS Monitoring support |
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On Wed, 01 Oct, at 02:42:05PM, Andi Kleen wrote: > Matt Fleming <matt@console-pimps.org> writes: > > > > Changes in v2: > > > > - Added Jiri Olsa's Acked-by to PATCH 02/11. > > > > - Use x86_match_cpu() in intel_cqm_init() and make sure we grab the > > hotplug lock to prevent races as pointed out by Andi Kleen in > > PATCH 08/11. > > > > - Delete a stale comment in commit message of PATCH 10/11. > > No support for a modular driver?
I didn't include support for that because none of the other x86 pmu drivers are buildable as modules. Is there a reason for that?
It's not clear to me that it would be a worthwhile change to make this buildable as a module, since that would require a Kconfig entry and the user would be required to make a decision regarding whether or not they want to build CQM support.
It's much simpler to just build it in and enable it based on CONFIG_PERF_EVENTS + CONFIG_INTEL_CPU. In fact, that's one of the things I've always liked about the pmu drivers, if I move to a new machine and turn on PERF_EVENTS the correct drivers will be run.
-- Matt Fleming, Intel Open Source Technology Center
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