RE: [PATCH V2] perf script: add script to profile and resolve physical mem type

[Liang, Kan]

Hi Stephane,

Any comments for the script?

Thanks,
Kan
> 
> From: Kan Liang <Kan.liang@xxxxxxxxx>
> 
> There could be different types of memory in the system. E.g normal
> System Memory, Persistent Memory. To understand how the workload maps
> to
> those memories, it's important to know the I/O statistics of them.
> Perf can collect physical addresses, but those are raw data.
> It still needs extra work to resolve the physical addresses.
> Provide a script to facilitate the physical addresses resolving and
> I/O statistics.
> 
> Profile with MEM_INST_RETIRED.ALL_LOADS or
> MEM_UOPS_RETIRED.ALL_LOADS
> event if any of them is available.
> Look up the /proc/iomem and resolve the physical address.
> Provide memory type summary.
> 
> Here is an example output.
>  #perf script report mem-phys-addr
> Event: mem_inst_retired.all_loads:P
> Memory type                                    count   percentage
> ----------------------------------------  -----------  -----------
> System RAM                                        74        53.2%
> Persistent Memory                                 55        39.6%
> N/A                                               10         7.2%
> 
> Signed-off-by: Kan Liang <Kan.liang@xxxxxxxxx>
> ---
> 
> Changes since V1:
>  - Do not mix DLA and Load Latency. Do not compare the loads and stores.
>    Only profile the loads.
>  - Use event name to replace the RAW event
> 
>  tools/perf/scripts/python/bin/mem-phys-addr-record | 19 +++++
>  tools/perf/scripts/python/bin/mem-phys-addr-report |  3 +
>  tools/perf/scripts/python/mem-phys-addr.py         | 97
> ++++++++++++++++++++++
>  .../util/scripting-engines/trace-event-python.c    |  2 +
>  4 files changed, 121 insertions(+)
>  create mode 100644 tools/perf/scripts/python/bin/mem-phys-addr-record
>  create mode 100644 tools/perf/scripts/python/bin/mem-phys-addr-report
>  create mode 100644 tools/perf/scripts/python/mem-phys-addr.py
> 
> diff --git a/tools/perf/scripts/python/bin/mem-phys-addr-record
> b/tools/perf/scripts/python/bin/mem-phys-addr-record
> new file mode 100644
> index 0000000..5a87512
> --- /dev/null
> +++ b/tools/perf/scripts/python/bin/mem-phys-addr-record
> @@ -0,0 +1,19 @@
> +#!/bin/bash
> +
> +#
> +# Profiling physical memory by all retired load instructions/uops event
> +# MEM_INST_RETIRED.ALL_LOADS or MEM_UOPS_RETIRED.ALL_LOADS
> +#
> +
> +load=`perf list | grep mem_inst_retired.all_loads`
> +if [ -z "$load" ]; then
> +	load=`perf list | grep mem_uops_retired.all_loads`
> +fi
> +if [ -z "$load" ]; then
> +	echo "There is no event to count all retired load instructions/uops."
> +	exit 1
> +fi
> +
> +arg=$(echo $load | tr -d ' ')
> +arg="$arg:P"
> +perf record --phys-data -e $arg $@
> diff --git a/tools/perf/scripts/python/bin/mem-phys-addr-report
> b/tools/perf/scripts/python/bin/mem-phys-addr-report
> new file mode 100644
> index 0000000..3f2b847
> --- /dev/null
> +++ b/tools/perf/scripts/python/bin/mem-phys-addr-report
> @@ -0,0 +1,3 @@
> +#!/bin/bash
> +# description: resolve physical address samples
> +perf script $@ -s "$PERF_EXEC_PATH"/scripts/python/mem-phys-addr.py
> diff --git a/tools/perf/scripts/python/mem-phys-addr.py
> b/tools/perf/scripts/python/mem-phys-addr.py
> new file mode 100644
> index 0000000..1d1f757
> --- /dev/null
> +++ b/tools/perf/scripts/python/mem-phys-addr.py
> @@ -0,0 +1,97 @@
> +# mem-phys-addr.py: Resolve physical address samples
> +# Copyright (c) 2017, Intel Corporation.
> +#
> +# This program is free software; you can redistribute it and/or modify it
> +# under the terms and conditions of the GNU General Public License,
> +# version 2, as published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope it will be useful, but WITHOUT
> +# ANY WARRANTY; without even the implied warranty of
> MERCHANTABILITY or
> +# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
> for
> +# more details.
> +
> +from __future__ import division
> +import os
> +import sys
> +import struct
> +import re
> +import bisect
> +import collections
> +
> +sys.path.append(os.environ['PERF_EXEC_PATH'] + \
> +	'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
> +
> +system_ram = []
> +pmem = []
> +f = None
> +load_mem_type_cnt = collections.Counter()
> +event_name = None
> +
> +def parse_iomem():
> +	global f
> +	f = open('/proc/iomem', 'r')
> +	for i, j in enumerate(f):
> +		m = re.split('-|:',j,2)
> +		if m[2].strip() == 'System RAM':
> +			system_ram.append(long(m[0], 16))
> +			system_ram.append(long(m[1], 16))
> +		if m[2].strip() == 'Persistent Memory':
> +			pmem.append(long(m[0], 16))
> +			pmem.append(long(m[1], 16))
> +
> +def print_memory_type():
> +	print "Event: %s" % (event_name)
> +	print "%-40s  %10s  %10s\n" % ("Memory type", "count",
> "percentage"),
> +	print "%-40s  %10s  %10s\n" % ("----------------------------------------", \
> +					"-----------", "-----------"),
> +	total = sum(load_mem_type_cnt.values())
> +	for mem_type, count in sorted(load_mem_type_cnt.most_common(),
> \
> +					key = lambda(k, v): (v, k), reverse =
> True):
> +		print "%-40s  %10d  %10.1f%%\n" % (mem_type, count, 100 *
> count / total),
> +
> +def trace_begin():
> +	parse_iomem()
> +
> +def trace_end():
> +	print_memory_type()
> +	f.close()
> +
> +def is_system_ram(phys_addr):
> +	#/proc/iomem is sorted
> +	position = bisect.bisect(system_ram, phys_addr)
> +	if position % 2 == 0:
> +		return False
> +	return True
> +
> +def is_persistent_mem(phys_addr):
> +	position = bisect.bisect(pmem, phys_addr)
> +	if position % 2 == 0:
> +		return False
> +	return True
> +
> +def find_memory_type(phys_addr):
> +	if phys_addr == 0:
> +		return "N/A"
> +	if is_system_ram(phys_addr):
> +		return "System RAM"
> +
> +	if is_persistent_mem(phys_addr):
> +		return "Persistent Memory"
> +
> +	#slow path, search all
> +	f.seek(0, 0)
> +	for j in f:
> +		m = re.split('-|:',j,2)
> +		if long(m[0], 16) <= phys_addr <= long(m[1], 16):
> +			return m[2]
> +	return "N/A"
> +
> +def process_event(param_dict):
> +	name       = param_dict["ev_name"]
> +	sample     = param_dict["sample"]
> +	phys_addr  = sample["phys_addr"]
> +
> +	global event_name
> +	if event_name == None:
> +		event_name = name
> +	load_mem_type_cnt[find_memory_type(phys_addr)] += 1
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c
> b/tools/perf/util/scripting-engines/trace-event-python.c
> index c7187f0..8cd6317 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -500,6 +500,8 @@ static PyObject *get_perf_sample_dict(struct
> perf_sample *sample,
>  			PyLong_FromUnsignedLongLong(sample->time));
>  	pydict_set_item_string_decref(dict_sample, "period",
>  			PyLong_FromUnsignedLongLong(sample->period));
> +	pydict_set_item_string_decref(dict_sample, "phys_addr",
> +			PyLong_FromUnsignedLongLong(sample-
> >phys_addr));
>  	set_sample_read_in_dict(dict_sample, sample, evsel);
>  	pydict_set_item_string_decref(dict, "sample", dict_sample);
> 
> --
> 2.7.4