[PATCH 00/13] perf mem/c2c: Add support for AMD

From: Ravi Bangoria <ravi.bangoria@amd.com>
To: <peterz@infradead.org>, <acme@kernel.org>
Cc: <ravi.bangoria@amd.com>, <jolsa@kernel.org>,
	<namhyung@kernel.org>, <eranian@google.com>, <irogers@google.com>,
	<jmario@redhat.com>, <leo.yan@linaro.org>, <alisaidi@amazon.com>,
	<ak@linux.intel.com>, <kan.liang@linux.intel.com>,
	<dave.hansen@linux.intel.com>, <hpa@zytor.com>,
	<mingo@redhat.com>, <mark.rutland@arm.com>,
	<alexander.shishkin@linux.intel.com>, <tglx@linutronix.de>,
	<bp@alien8.de>, <x86@kernel.org>,
	<linux-perf-users@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <sandipan.das@amd.com>,
	<ananth.narayan@amd.com>, <kim.phillips@amd.com>,
	<santosh.shukla@amd.com>
Subject: [PATCH 00/13] perf mem/c2c: Add support for AMD
Date: Wed, 25 May 2022 15:09:25 +0530	[thread overview]
Message-ID: <20220525093938.4101-1-ravi.bangoria@amd.com> (raw)

Perf mem and c2c tools are wrappers around perf record with mem load/
store events. IBS tagged load/store sample provides most of the
information needed for these tools. Enable support for these tools on
AMD Zen processors based on IBS Op pmu.

There are some limitations though: Only load/store instructions provide
mem/c2c information. However, IBS does not provide a way to choose a
particular type of instruction to tag. This results in many non-LS
instructions being tagged which appear as N/A. IBS, being an uncore pmu
from kernel point of view[1], does not support per process monitoring.
Thus, perf mem/c2c on AMD are currently supported in per-cpu mode only.

Example:
  $ sudo ./perf mem record -- -c 10000
  ^C[ perf record: Woken up 227 times to write data ]
  [ perf record: Captured and wrote 58.760 MB perf.data (836978 samples) ]

  $ sudo ./perf mem report -F mem,sample,snoop
  Samples: 836K of event 'ibs_op//', Event count (approx.): 8418762
  Memory access                  Samples  Snoop
  N/A                             700620  N/A
  L1 hit                          126675  N/A
  L2 hit                             424  N/A
  L3 hit                             664  HitM
  L3 hit                              10  N/A
  Local RAM hit                        2  N/A
  Remote RAM (1 hop) hit            8558  N/A
  Remote Cache (1 hop) hit             3  N/A
  Remote Cache (1 hop) hit             2  HitM
  Remote Cache (2 hops) hit            10  HitM
  Remote Cache (2 hops) hit             6  N/A
  Uncached hit                         4  N/A

[1]: https://lore.kernel.org/lkml/20220113134743.1292-1-ravi.bangoria@amd.com

Prepared on tip/perf/core (bae19fdd7e9e)

Ravi Bangoria (13):
  perf/mem: Introduce PERF_MEM_LVLNUM_{EXTN_MEM|IO}
  perf/x86/amd: Add IBS OP_DATA2/3 register bit definitions
  perf/x86/amd: Support PERF_SAMPLE_DATA_SRC based on IBS_OP_DATA*
  perf/x86/amd: Support PERF_SAMPLE_WEIGHT using IBS
    OP_DATA3[IbsDcMissLat]
  perf/x86/amd: Support PERF_SAMPLE_ADDR using IBS_DC_LINADDR
  perf/x86/amd: Support PERF_SAMPLE_PHY_ADDR using IBS_DC_PHYSADDR
  perf tool: Sync include/uapi/linux/perf_event.h header
  perf tool: Sync arch/x86/include/asm/amd-ibs.h header
  perf mem: Add support for printing PERF_MEM_LVLNUM_{EXTN_MEM|IO}
  perf mem/c2c: Set PERF_SAMPLE_WEIGHT for LOAD_STORE events
  perf mem/c2c: Add load store event mappings for AMD
  perf mem/c2c: Avoid printing empty lines for unsupported events
  perf mem: Use more generic term for LFB

 arch/x86/events/amd/ibs.c                | 351 ++++++++++++++++++++++-
 arch/x86/include/asm/amd-ibs.h           |  76 +++++
 include/uapi/linux/perf_event.h          |   4 +-
 tools/arch/x86/include/asm/amd-ibs.h     |  76 +++++
 tools/include/uapi/linux/perf_event.h    |   4 +-
 tools/perf/Documentation/perf-c2c.txt    |  14 +-
 tools/perf/Documentation/perf-mem.txt    |   3 +-
 tools/perf/Documentation/perf-record.txt |   1 +
 tools/perf/arch/x86/util/mem-events.c    |  31 +-
 tools/perf/builtin-c2c.c                 |   1 +
 tools/perf/builtin-mem.c                 |   1 +
 tools/perf/util/mem-events.c             |  17 +-
 12 files changed, 557 insertions(+), 22 deletions(-)

-- 
2.31.1