lkml.org 
[lkml]   [2021]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 02/26] perf jevents: Support unit value "cpu_core" and "cpu_atom"
Date
For some Intel platforms, such as Alderlake, which is a hybrid platform
and it consists of atom cpu and core cpu. Each cpu has dedicated event
list. Part of events are available on core cpu, part of events are
available on atom cpu.

The kernel exports new cpu pmus: cpu_core and cpu_atom. The event in
json is added with a new field "Unit" to indicate which pmu the event
is available on.

For example, one event in cache.json,

{
"BriefDescription": "Counts the number of load ops retired that",
"CollectPEBSRecord": "2",
"Counter": "0,1,2,3",
"EventCode": "0xd2",
"EventName": "MEM_LOAD_UOPS_RETIRED_MISC.MMIO",
"PEBScounters": "0,1,2,3",
"SampleAfterValue": "1000003",
"UMask": "0x80",
"Unit": "cpu_atom"
},

The unit "cpu_atom" indicates this event is only available on "cpu_atom".

In generated pmu-events.c, we can see:

{
.name = "mem_load_uops_retired_misc.mmio",
.event = "period=1000003,umask=0x80,event=0xd2",
.desc = "Counts the number of load ops retired that. Unit: cpu_atom ",
.topic = "cache",
.pmu = "cpu_atom",
},

But if without this patch, the "uncore_" prefix is added before "cpu_atom",
such as:
.pmu = "uncore_cpu_atom"

That would be a wrong pmu.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v6:
- No change.

tools/perf/pmu-events/jevents.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index 33aa3c885eaf..ed4f0bd72e5a 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -285,6 +285,8 @@ static struct map {
{ "imx8_ddr", "imx8_ddr" },
{ "L3PMC", "amd_l3" },
{ "DFPMC", "amd_df" },
+ { "cpu_core", "cpu_core" },
+ { "cpu_atom", "cpu_atom" },
{}
};

--
2.17.1
\
 
 \ /
  Last update: 2021-04-27 09:05    [W:0.211 / U:0.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site