linux-kernel - Re: [PATCH v2 4/6] perf/amd/iommu: Introduce data structure for tracking prev count.

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Date:	Thu, 7 Jan 2016 13:27:00 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	bp@...en8.de, peterz@...radead.org, mingo@...hat.com,
	acme@...nel.org, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH v2 4/6] perf/amd/iommu: Introduce data structure for
 tracking prev count.

On Fri, Jan 01, 2016 at 12:13:38PM -0600, Suravee Suthikulpanit wrote:
> To enable AMD IOMMU PMU to support multiple IOMMUs, this patch introduces
> a new data structure, perf_amd_iommu.prev_cnts, to track previous counts
> of IOMMU performance counters in multi-IOMMU environment.
> 
> Also, this patch allocates perf_iommu_cnts for internal use
> when manages counters.

>From this commit message I don't really get what perf_amd_iommu.prev_cnts
and perf_iommu_cnts will be used for. Can you please add this to the
message?

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