From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
linux-perf-users@vger.kernel.org, irogers@google.com,
yeoreum.yun@arm.com, mark.rutland@arm.com, namhyung@kernel.org,
acme@kernel.org, James Clark <james.clark@linaro.org>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
Will Deacon <will@kernel.org>,
robh@kernel.org, Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
"Liang, Kan" <kan.liang@linux.intel.com>,
John Garry <john.g.garry@oracle.com>,
Mike Leach <mike.leach@linaro.org>, Leo Yan <leo.yan@linux.dev>,
Graham Woodward <graham.woodward@arm.com>,
Michael Petlan <mpetlan@redhat.com>,
Veronika Molnarova <vmolnaro@redhat.com>,
Thomas Richter <tmricht@linux.ibm.com>,
Athira Rajeev <atrajeev@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH v3 0/5] perf: arm_spe: Add format option for discard mode
Date: Fri, 10 Jan 2025 16:22:48 +0000 [thread overview]
Message-ID: <173652065683.3245172.11665292685923367751.b4-ty@kernel.org> (raw)
In-Reply-To: <20250108142904.401139-1-james.clark@linaro.org>
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
next prev parent reply other threads:[~2025-01-10 16:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-08 14:28 [PATCH v3 0/5] perf: arm_spe: Add format option for discard mode James Clark
2025-01-08 14:28 ` [PATCH v3 1/5] " James Clark
2025-01-08 20:16 ` Yeo Reum Yun
2025-01-08 14:28 ` [PATCH v3 2/5] perf docs: arm_spe: Document new " James Clark
2025-01-08 14:28 ` [PATCH v3 3/5] perf tool: arm-spe: Pull out functions for aux buffer and tracking setup James Clark
2025-01-08 14:28 ` [PATCH v3 4/5] perf tool: arm-spe: Don't allocate buffer or tracking event in discard mode James Clark
2025-01-08 14:29 ` [PATCH v3 5/5] perf test: arm_spe: Add test for " James Clark
2025-01-10 16:22 ` Will Deacon [this message]
2025-01-13 14:33 ` [PATCH v3 0/5] perf: arm_spe: Add format option " James Clark
2025-01-13 14:45 ` Arnaldo Carvalho de Melo
-- strict thread matches above, loose matches on Subject: below --
2025-01-08 14:27 James Clark
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