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Date: Tue, 27 Apr 2021 14:50:17 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Jin Yao <yao.jin@...ux.intel.com>
Cc: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, alexander.shishkin@...ux.intel.com,
Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v6 00/26] perf tool: AlderLake hybrid support series 1
On Tue, Apr 27, 2021 at 03:01:13PM +0800, Jin Yao wrote:
> AlderLake uses a hybrid architecture utilizing Golden Cove cores
> (core cpu) and Gracemont cores (atom cpu). Each cpu has dedicated
> event list. Some events are available on core cpu, some events
> are available on atom cpu and some events can be available on both.
>
> Kernel exports new pmus "cpu_core" and "cpu_atom" through sysfs:
> /sys/devices/cpu_core
> /sys/devices/cpu_atom
>
> cat /sys/devices/cpu_core/cpus
> 0-15
>
> cat /sys/devices/cpu_atom/cpus
> 16-23
>
> In this example, core cpus are 0-15 and atom cpus are 16-23.
>
> To enable a core only event or atom only event:
>
> cpu_core/<event name>/
> or
> cpu_atom/<event name>/
>
> Count the 'cycles' event on core cpus.
>
> # perf stat -e cpu_core/cycles/ -a -- sleep 1
>
> Performance counter stats for 'system wide':
>
> 12,853,951,349 cpu_core/cycles/
>
> 1.002581249 seconds time elapsed
>
> If one event is available on both atom cpu and core cpu, two events
> are created automatically.
>
> # perf stat -e cycles -a -- sleep 1
>
> Performance counter stats for 'system wide':
>
> 12,856,467,438 cpu_core/cycles/
> 6,404,634,785 cpu_atom/cycles/
>
> 1.002453013 seconds time elapsed
>
> Group is supported if the events are from same pmu, otherwise a warning
> is displayed and disable grouping automatically.
>
> # perf stat -e '{cpu_core/cycles/,cpu_core/instructions/}' -a -- sleep 1
>
> Performance counter stats for 'system wide':
>
> 12,863,866,968 cpu_core/cycles/
> 554,795,017 cpu_core/instructions/
>
> 1.002616117 seconds time elapsed
>
> # perf stat -e '{cpu_core/cycles/,cpu_atom/instructions/}' -a -- sleep 1
> WARNING: events in group from different hybrid PMUs!
> WARNING: grouped events cpus do not match, disabling group:
> anon group { cpu_core/cycles/, cpu_atom/instructions/ }
>
> Performance counter stats for 'system wide':
>
> 6,283,970 cpu_core/cycles/
> 765,635 cpu_atom/instructions/
>
> 1.003959036 seconds time elapsed
>
> Note that, since the whole patchset for AlderLake hybrid support is very
> large (40+ patches). For simplicity, it's splitted into several patch
> series.
>
> The patch series 1 only supports the basic functionality. The advanced
> supports for perf-c2c/perf-mem/topdown/metrics/topology header and others
> will be added in follow-up patch series.
>
> The perf tool codes can also be found at:
> https://github.com/yaoj/perf.git
hi,
did you update the branch for v6? I think I can't see
the new update there
thanks,
jirka
>
> Note that, this patch series is based on tmp.perf/core branch.
>
> v6:
> ---
> - Rebase to tmp.perf/core branch.
>
> - A minor update in v6 patch series.
>
> In '[PATCH v6 18/26] perf tests: Add hybrid cases for 'Parse event
> definition strings' test', we add a test case for cache events with
> pmu prefix.
>
> No other updates.
>
> v5:
> ---
> - Now Liang Kan's patch series for AlderLake perf core support has been
> upstreamed. So the interface for perf tool part will not be changed.
>
> - '[PATCH v5 12/26] perf parse-events: Support event inside hybrid pmu',
> check the head_config list has only one term and if yes then do the
> second parsing. We drop the 'parsed' param and make parse_events__with_hybrid_pmu
> return 0 when we find some event.
>
> Move 'evsel->use_config_name = true;' to the patch
> '[PATCH v5 07/26] perf stat: Uniquify hybrid event name'.
>
> - '[PATCH v5 14/26] perf stat: Add default hybrid events',
> do the same way like when topdown calls parse events for checking
> result and displayt the error.
>
> - '[PATCH v5 15/26] perf stat: Filter out unmatched aggregation for hybrid event',
> use Jiri's code to filter, which is much simpler than original.
>
> - Some perf test minor updates.
>
> v4:
> ---
> - In Liang Kan's patch:
> '[PATCH V6 21/25] perf: Extend PERF_TYPE_HARDWARE and PERF_TYPE_HW_CACHE',
> the user interface for hardware events and cache events are changed, so
> perf tool patches are changed as well.
>
> - Fix an issue when atom CPUs are offlined. "/sys/bus/event_source/devices/cpu_atom/cpus"
> exists but the content is empty. For this case, we can't enable the cpu_atom
> PMU. '[PATCH v4 05/25] perf pmu: Save detected hybrid pmus to a global pmu list'
>
> - Define 'ret' variable for return value in patch
> '[PATCH v4 09/25] perf parse-events: Create two hybrid cache events'
>
> - Directly return add_raw_hybrid() in patch
> '[PATCH v4 10/25] perf parse-events: Create two hybrid raw events'
>
> - Drop the patch 'perf pmu: Support 'cycles' and 'branches' inside
> hybrid PMU'.
>
> - Separate '[PATCH v3 12/27] perf parse-events: Support no alias assigned event
> inside hybrid PMU' into two patches:
> '[PATCH v4 11/25] perf parse-events: Compare with hybrid pmu name'
> '[PATCH v4 12/25] perf parse-events: Support event inside hybrid pmu'.
> And these two patches are improved according to Jiri's comments.
>
> v3:
> ---
> - Drop 'perf evlist: Hybrid event uses its own cpus'. This patch is wide
> and actually it's not very necessary. The current perf framework has
> processed the cpus for evsel well even for hybrid evsel. So this patch can
> be dropped.
>
> - Drop 'perf evsel: Adjust hybrid event and global event mixed group'.
> The patch is a bit tricky and hard to understand. In v3, we will disable
> grouping when the group members are from different PMUs. So this patch
> would be not necessary.
>
> - Create parse-events-hybrid.c/parse-events-hybrid.h and evlist-hybrid.c/evlist-hybrid.h.
> Move hybrid related codes to these files.
>
> - Create a new patch 'perf pmu: Support 'cycles' and 'branches' inside hybrid PMU' to
> support 'cycles' and 'branches' inside PMU.
>
> - Create a new patch 'perf record: Uniquify hybrid event name' to tell user the
> pmu which the event belongs to for perf-record.
>
> - If group members are from different hybrid PMUs, shows warning and disable
> grouping.
>
> - Other refining and refactoring.
>
> v2:
> ---
> - Drop kernel patches (Kan posted the series "Add Alder Lake support for perf (kernel)" separately).
> - Drop the patches for perf-c2c/perf-mem/topdown/metrics/topology header supports,
> which will be added in series 2 or series 3.
> - Simplify the arguments of __perf_pmu__new_alias() by passing
> the 'struct pme_event' pointer.
> - Check sysfs validity before access.
> - Use pmu style event name, such as "cpu_core/cycles/".
> - Move command output two chars to the right.
> - Move pmu hybrid functions to new created pmu-hybrid.c/pmu-hybrid.h.
> This is to pass the perf test python case.
>
> Jin Yao (26):
> tools headers uapi: Update tools's copy of linux/perf_event.h
> perf jevents: Support unit value "cpu_core" and "cpu_atom"
> perf pmu: Simplify arguments of __perf_pmu__new_alias
> perf pmu: Save pmu name
> perf pmu: Save detected hybrid pmus to a global pmu list
> perf pmu: Add hybrid helper functions
> perf stat: Uniquify hybrid event name
> perf parse-events: Create two hybrid hardware events
> perf parse-events: Create two hybrid cache events
> perf parse-events: Create two hybrid raw events
> perf parse-events: Compare with hybrid pmu name
> perf parse-events: Support event inside hybrid pmu
> perf record: Create two hybrid 'cycles' events by default
> perf stat: Add default hybrid events
> perf stat: Filter out unmatched aggregation for hybrid event
> perf stat: Warn group events from different hybrid PMU
> perf record: Uniquify hybrid event name
> perf tests: Add hybrid cases for 'Parse event definition strings' test
> perf tests: Add hybrid cases for 'Roundtrip evsel->name' test
> perf tests: Skip 'Setup struct perf_event_attr' test for hybrid
> perf tests: Support 'Track with sched_switch' test for hybrid
> perf tests: Support 'Parse and process metrics' test for hybrid
> perf tests: Support 'Session topology' test for hybrid
> perf tests: Support 'Convert perf time to TSC' test for hybrid
> perf tests: Skip 'perf stat metrics (shadow stat) test' for hybrid
> perf Documentation: Document intel-hybrid support
>
> include/uapi/linux/perf_event.h | 15 ++
> tools/include/uapi/linux/perf_event.h | 15 ++
> tools/perf/Documentation/intel-hybrid.txt | 214 +++++++++++++++++++++
> tools/perf/Documentation/perf-record.txt | 1 +
> tools/perf/Documentation/perf-stat.txt | 2 +
> tools/perf/builtin-record.c | 47 ++++-
> tools/perf/builtin-stat.c | 36 ++++
> tools/perf/pmu-events/jevents.c | 2 +
> tools/perf/tests/attr.c | 4 +
> tools/perf/tests/evsel-roundtrip-name.c | 19 +-
> tools/perf/tests/parse-events.c | 171 ++++++++++++++++
> tools/perf/tests/parse-metric.c | 8 +-
> tools/perf/tests/perf-time-to-tsc.c | 12 ++
> tools/perf/tests/shell/stat+shadow_stat.sh | 3 +
> tools/perf/tests/switch-tracking.c | 6 +-
> tools/perf/tests/topology.c | 13 +-
> tools/perf/util/Build | 3 +
> tools/perf/util/evlist-hybrid.c | 88 +++++++++
> tools/perf/util/evlist-hybrid.h | 14 ++
> tools/perf/util/evlist.c | 5 +-
> tools/perf/util/evsel.c | 12 +-
> tools/perf/util/evsel.h | 4 +-
> tools/perf/util/parse-events-hybrid.c | 178 +++++++++++++++++
> tools/perf/util/parse-events-hybrid.h | 23 +++
> tools/perf/util/parse-events.c | 97 +++++++++-
> tools/perf/util/parse-events.h | 9 +-
> tools/perf/util/parse-events.y | 9 +-
> tools/perf/util/pmu-hybrid.c | 89 +++++++++
> tools/perf/util/pmu-hybrid.h | 22 +++
> tools/perf/util/pmu.c | 64 ++++--
> tools/perf/util/pmu.h | 7 +
> tools/perf/util/python-ext-sources | 2 +
> tools/perf/util/stat-display.c | 18 +-
> 33 files changed, 1162 insertions(+), 50 deletions(-)
> create mode 100644 tools/perf/Documentation/intel-hybrid.txt
> create mode 100644 tools/perf/util/evlist-hybrid.c
> create mode 100644 tools/perf/util/evlist-hybrid.h
> create mode 100644 tools/perf/util/parse-events-hybrid.c
> create mode 100644 tools/perf/util/parse-events-hybrid.h
> create mode 100644 tools/perf/util/pmu-hybrid.c
> create mode 100644 tools/perf/util/pmu-hybrid.h
>
> --
> 2.17.1
>
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