From: Will Deacon <will@kernel.org>
To: John Garry <john.garry@huawei.com>
Cc: mark.rutland@arm.com, ak@linux.intel.com, suzuki.poulose@arm.com,
peterz@infradead.org, robin.murphy@arm.com, linuxarm@huawei.com,
acme@kernel.org, linux-kernel@vger.kernel.org,
zhangshaokun@hisilicon.com, alexander.shishkin@linux.intel.com,
mingo@redhat.com, james.clark@arm.com, namhyung@kernel.org,
jolsa@redhat.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH RFC 0/7] perf pmu-events: Support event aliasing for system PMUs
Date: Tue, 18 Feb 2020 12:57:07 +0000 [thread overview]
Message-ID: <20200218125707.GB20212@willie-the-truck> (raw)
In-Reply-To: <1579876505-113251-1-git-send-email-john.garry@huawei.com>
On Fri, Jan 24, 2020 at 10:34:58PM +0800, John Garry wrote:
> Currently event aliasing for only CPU and uncore PMUs is supported. In
> fact, only uncore PMUs aliasing for when the uncore PMUs are fixed for a
> CPU is supported, which may not always be the case for certain
> architectures.
>
> This series adds support for PMU event aliasing for system and other
> uncore PMUs which are not fixed to a specific CPU.
>
> For this, we introduce support for another per-arch mapfile, which maps a
> particular system identifier to a set of system PMU events for that
> system. This is much the same as what we do for CPU event aliasing.
>
> To support this, we need to change how we match a PMU to a mapfile,
> whether it should use a CPU or system mapfile. For this we do the
> following:
>
> - For CPU PMU, we always match for the event mapfile based on the CPUID.
> This has not changed.
>
> - For an uncore or system PMU, we match first based on the SYSID (if set).
> If this fails, then we match on the CPUID.
>
> This works for x86, as x86 would not have any system mapfiles for uncore
> PMUs (and match on the CPUID).
>
> Initial reference support is also added for ARM SMMUv3 PMCG (Performance
> Monitor Event Group) PMU for HiSilicon hip08 platform with only a single
> event so far - see driver in drivers/perf/arm_smmuv3_pmu.c for that driver.
Why don't we just expose SMMU_IIDR in the SMMUv3 PMU directory, so that
you can key off that? I'm nervous about coming up with a global "SYSID"
when we don't have the ability to standardise anything in that space.
Will
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next prev parent reply other threads:[~2020-02-18 12:57 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-24 14:34 [PATCH RFC 0/7] perf pmu-events: Support event aliasing for system PMUs John Garry
2020-01-24 14:34 ` [PATCH RFC 1/7] perf jevents: Add support for an extra directory level John Garry
2020-02-10 12:07 ` Jiri Olsa
2020-02-10 15:47 ` John Garry
2020-01-24 14:35 ` [PATCH RFC 2/7] perf vendor events arm64: Relocate hip08 core events John Garry
2020-01-24 14:35 ` [PATCH RFC 3/7] perf jevents: Add support for a system events PMU John Garry
2020-02-10 12:07 ` Jiri Olsa
2020-02-10 12:07 ` Jiri Olsa
2020-02-10 15:55 ` John Garry
2020-02-11 14:46 ` Jiri Olsa
2020-01-24 14:35 ` [PATCH RFC 4/7] perf pmu: Rename uncore symbols to include system PMUs John Garry
2020-02-10 12:07 ` Jiri Olsa
2020-02-10 15:44 ` John Garry
2020-02-11 14:43 ` Jiri Olsa
2020-02-11 15:36 ` John Garry
2020-02-12 12:08 ` Jiri Olsa
2020-01-24 14:35 ` [PATCH RFC 5/7] perf pmu: Support matching by sysid John Garry
2020-02-10 12:07 ` Jiri Olsa
2020-02-10 16:22 ` John Garry
2020-02-11 13:47 ` Jiri Olsa
2020-02-11 15:07 ` John Garry
2020-02-12 10:08 ` John Garry
2020-02-12 12:16 ` Jiri Olsa
2020-02-12 12:24 ` John Garry
2020-01-24 14:35 ` [PATCH RFC 6/7] perf vendor events arm64: Relocate uncore events for hip08 John Garry
2020-01-24 14:35 ` [PATCH RFC 7/7] perf vendor events arm64: Add hip08 SMMUv3 PMCG IMP DEF events John Garry
2020-02-11 15:24 ` [PATCH RFC 0/7] perf pmu-events: Support event aliasing for system PMUs James Clark
2020-02-11 15:41 ` John Garry
2020-02-18 12:57 ` Will Deacon [this message]
2020-02-18 13:24 ` John Garry
2020-02-18 13:39 ` Will Deacon
2020-02-18 16:19 ` John Garry
2020-02-18 17:08 ` Mark Rutland
2020-02-18 17:58 ` John Garry
2020-02-18 18:13 ` Mark Rutland
2020-02-19 1:55 ` Joakim Zhang
2020-02-19 8:44 ` John Garry
2020-02-19 12:40 ` Joakim Zhang
2020-02-19 14:28 ` John Garry
2020-02-19 8:50 ` John Garry
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