linux-kernel - Re: [PATCH v3 0/5] perf: arm_spe: Add format option for discard mode

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Message-Id: <173652065683.3245172.11665292685923367751.b4-ty@kernel.org>
Date: Fri, 10 Jan 2025 16:22:48 +0000
From: Will Deacon <will@...nel.org>
To: linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org,
	irogers@...gle.com,
	yeoreum.yun@....com,
	mark.rutland@....com,
	namhyung@...nel.org,
	acme@...nel.org,
	James Clark <james.clark@...aro.org>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	robh@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	John Garry <john.g.garry@...cle.com>,
	Mike Leach <mike.leach@...aro.org>,
	Leo Yan <leo.yan@...ux.dev>,
	Graham Woodward <graham.woodward@....com>,
	Michael Petlan <mpetlan@...hat.com>,
	Veronika Molnarova <vmolnaro@...hat.com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: Re: [PATCH v3 0/5] perf: arm_spe: Add format option for discard mode

On Wed, 08 Jan 2025 14:28:55 +0000, James Clark wrote:
> Discard mode (Armv8.6) is a way to enable SPE related PMU events without
> the overhead of recording any data. Add a format option, tests and docs
> for it.
> 
> In theory we could make the driver drop calls to allocate the aux buffer
> when discard mode is enabled. This would give a small memory saving,
> but I think there is potential to interfere with any tools that don't
> expect this so I left the aux allocation untouched. Even old tools that
> don't know about discard mode will be able to use it because we publish
> the format option. Not allocating the aux buffer will have to be added
> to tools which I've done in Perf.
> 
> [...]

Applied driver and docs patches to will (for-next/perf), thanks!

[1/5] perf: arm_spe: Add format option for discard mode
      https://git.kernel.org/will/c/d28d95bc63cb
[2/5] perf docs: arm_spe: Document new discard mode
      https://git.kernel.org/will/c/ba113ecad81a

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev