From: Will Deacon <will@kernel.org>
To: mark.rutland@arm.com, Robin Murphy <robin.murphy@arm.com>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
Will Deacon <will@kernel.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] perf/arm-cmn: Reset DTM_PMU_CONFIG at probe
Date: Thu, 19 Jan 2023 19:08:43 +0000 [thread overview]
Message-ID: <167415190277.3429004.658905197029681030.b4-ty@kernel.org> (raw)
In-Reply-To: <ba5f38b3dc733cd06bfb5e659b697e76d18c2183.1670269572.git.robin.murphy@arm.com>
On Mon, 5 Dec 2022 19:46:13 +0000, Robin Murphy wrote:
> Although we treat the DTM counters as free-running such that we're not
> too concerned about the initial DTM state, it's possible for a previous
> user to have left DTM counters enabled and paired with DTC counters.
> Thus if the first events are scheduled using some, but not all, DTMs,
> the as-yet-unused ones could end up adding spurious increments to the
> event counts at the DTC. Make sure we sync our initial DTM_PMU_CONFIG
> state to all the DTMs at probe time to avoid that possibility.
>
> [...]
Applied to will (for-next/perf), thanks!
[1/1] perf/arm-cmn: Reset DTM_PMU_CONFIG at probe
https://git.kernel.org/will/c/bb21ef19a3d8
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
prev parent reply other threads:[~2023-01-19 19:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-05 19:46 Robin Murphy
2023-01-19 19:08 ` Will Deacon [this message]
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