linux-kernel - Re: [PATCH V5 1/8] perf/x86/intel/uncore: customized event

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Date:   Thu, 18 Jan 2018 10:36:42 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Kan Liang <kan.liang@...el.com>
cc:     mingo@...hat.com, peterz@...radead.org,
        linux-kernel@...r.kernel.org, acme@...nel.org, eranian@...gle.com,
        ak@...ux.intel.com
Subject: Re: [PATCH V5 1/8] perf/x86/intel/uncore: customized event_read for
 client IMC uncore

On Mon, 15 Jan 2018, kan.liang@...el.com wrote:

> From: Kan Liang <Kan.liang@...el.com>
> 
> There are two free running counters for client IMC uncore. The custom
> event_init() function hardcode their index to 'UNCORE_PMC_IDX_FIXED' and
> 'UNCORE_PMC_IDX_FIXED + 1'. To support the 'UNCORE_PMC_IDX_FIXED + 1'
> case, the generic uncore_perf_event_update is obscurely hacked.
> The code quality issue will bring problem when new counter index is
> introduced into generic code. For example, free running counter index.
> 
> Introduce customized event_read function for client IMC uncore.
> The customized function is exactly copied from previous generic
> uncore_pmu_event_read.
> The 'UNCORE_PMC_IDX_FIXED + 1' case will be isolated for client IMC
> uncore only.
> 
> Signed-off-by: Kan Liang <Kan.liang@...el.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>