linux-kernel - Re: Perf framework : Cluster based counter support

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Message-ID: <20190628165915.GB5143@lakrids.cambridge.arm.com>
Date:   Fri, 28 Jun 2019 17:59:15 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Mukesh Ojha <mojha@...eaurora.org>
Cc:     lkml <linux-kernel@...r.kernel.org>
Subject: Re: Perf framework : Cluster based counter support

On Fri, Jun 28, 2019 at 10:23:10PM +0530, Mukesh Ojha wrote:
> Hi All,

Hi Mukesh,

> Is it looks considerable to add cluster based event support to add in
> current perf event framework and later in userspace perf to support
> such events ?

Could you elaborate on what you mean by "cluster based event"?

I assume you mean something like events for a cluster-affine shared
resource like some level of cache?

If so, there's a standard pattern for supporting such system/uncore
PMUs, see drivers/perf/qcom_l2_pmu.c and friends for examples.

Thanks,
Mark.