From: John Garry <john.garry@huawei.com>
To: Jiri Olsa <jolsa@redhat.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,
will@kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH RFC 5/7] perf pmu: Support matching by sysid
Date: Tue, 11 Feb 2020 15:07:31 +0000 [thread overview]
Message-ID: <2a51ce93-fa68-8088-f31f-2fd692253335@huawei.com> (raw)
In-Reply-To: <20200211134704.GB93194@krava>
On 11/02/2020 13:47, Jiri Olsa wrote:
Hi Jirka,
>>>> +
>>>> + return buf;
>>>> +}
>>>> +
>>
>> I have another series to add kernel support for a system identifier sysfs
>> entry, which I sent after this series:
>>
>> https://lore.kernel.org/linux-acpi/1580210059-199540-1-git-send-email-john.garry@huawei.com/
>>
>> It is different to what I am relying on here - it uses a kernel soc driver
>> for firmware ACPI PPTT identifier. Progress is somewhat blocked at the
>> moment however and I may have to use a different method:
>>
>> https://lore.kernel.org/linux-acpi/20200128123415.GB36168@bogus/
>
> I'll try to check ;-)
Summary is that there exists an ACPI firmware field which we could
expose to userspace via sysfs - this would provide the system id.
However there is a proposal to deprecate it in the ACPI standard and, as
such, would prefer that we don't add kernel support for it at this stage.
So I am evaluating the alternative in the meantime, which again is some
firmware method which should allow us to expose a system id to userspace
via sysfs. Unfortunately this is arm specific. However, other archs can
still provide their own method, maybe a soc driver:
Documentation/ABI/testing/sysfs-devices-soc#n15
>
>>
>>>> +static char *perf_pmu__getsysid(void)
>>>> +{
>>>> + char *sysid;
>>>> + static bool printed;
>>>> +
>>>> + sysid = getenv("PERF_SYSID");
>>>> + if (sysid)
>>>> + sysid = strdup(sysid);
>>>> +
>>>> + if (!sysid)
>>>> + sysid = get_sysid_str();
>>>> + if (!sysid)
>>>> + return NULL;
>>>> +
>>>> + if (!printed) {
>>>> + pr_debug("Using SYSID %s\n", sysid);
>>>> + printed = true;
>>>> + }
>>>> + return sysid;
>>>> +}
>>>
>>> this part is getting complicated and AFAIK we have no tests for it
>>>
>>> if you could think of any tests that'd be great.. Perhaps we could
>>> load 'our' json test files and check appropriate events/aliasses
>>> via in pmu object.. or via parse_events interface.. those test aliases
>>> would have to be part of perf, but we have tests compiled in anyway
>>
>> Sorry, I don't fully follow.
>>
>> Are you suggesting that we could load the specific JSONs tables for a system
>> from the host filesystem?
>
> I wish to see some test for all this.. I can only think about having
> 'test' json files compiled with perf and 'perf test' that looks them
> up and checks that all is in the proper place
OK, let me consider this part for perf test support.
Thanks,
John
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next prev parent reply other threads:[~2020-02-11 15:07 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 [this message]
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
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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