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AFNElJ+QkIqZ9TfN6pKWOkgsNyDm0YuF3MgI5W/950/Zus9+gRWjuBsH8PySnMnOj7kH0yxFTTgHUeLMAeYuwF0=@vger.kernel.org X-Gm-Message-State: AOJu0Yx/fvHCiyy4oBQ+5oubf+felcT5/9cxeWEkVFCGEW4mBzzGMql4 lNT37iikgZt0puJxkOpEVWvtqzkgH3up0eNSBLXi2WgwFmHRj5CnsGtMGdLnq1yavxA3rRBtPzy Twm02fKUiPA== X-Received: from dycrm24.prod.google.com ([2002:a05:693c:2a18:b0:2d9:8328:8324]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:f14d:b0:2ea:b7a9:580d with SMTP id 5a478bee46e88-2eab7a9593emr4347715eec.9.1776962112744; Thu, 23 Apr 2026 09:35:12 -0700 (PDT) Date: Thu, 23 Apr 2026 09:33:34 -0700 In-Reply-To: <20260423163406.1779809-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260423161006.1762700-1-irogers@google.com> <20260423163406.1779809-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260423163406.1779809-27-irogers@google.com> Subject: [PATCH v4 26/58] perf mem-phys-addr: Port mem-phys-addr to use python module From: Ian Rogers To: irogers@google.com, acme@kernel.org, adrian.hunter@intel.com, james.clark@linaro.org, leo.yan@linux.dev, namhyung@kernel.org, tmricht@linux.ibm.com Cc: 9erthalion6@gmail.com, adityab1@linux.ibm.com, alexandre.chartre@oracle.com, alice.mei.rogers@gmail.com, ankur.a.arora@oracle.com, ashelat@redhat.com, atrajeev@linux.ibm.com, blakejones@google.com, changbin.du@huawei.com, chuck.lever@oracle.com, collin.funk1@gmail.com, coresight@lists.linaro.org, ctshao@google.com, dapeng1.mi@linux.intel.com, derek.foreman@collabora.com, dsterba@suse.com, gautam@linux.ibm.com, howardchu95@gmail.com, john.g.garry@oracle.com, jolsa@kernel.org, jonathan.cameron@huawei.com, justinstitt@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mike.leach@arm.com, mingo@redhat.com, morbo@google.com, nathan@kernel.org, nichen@iscas.ac.cn, nick.desaulniers+lkml@gmail.com, pan.deng@intel.com, peterz@infradead.org, ravi.bangoria@amd.com, ricky.ringler@proton.me, stephen.s.brennan@oracle.com, sun.jian.kdev@gmail.com, suzuki.poulose@arm.com, swapnil.sapkal@amd.com, tanze@kylinos.cn, terrelln@fb.com, thomas.falcon@intel.com, tianyou.li@intel.com, tycho@kernel.org, wangyang.guo@intel.com, xiaqinxin@huawei.com, yang.lee@linux.alibaba.com, yuzhuo@google.com, zhiguo.zhou@intel.com, zli94@ncsu.edu Content-Type: text/plain; charset="UTF-8" Give an example of using the perf python session API to load a perf.data file and perform the behavior of tools/perf/scripts/python/mem-phys-addr.py. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- v2: Added command line '-i' option and cleaned up pylint issues. --- tools/perf/python/mem-phys-addr.py | 117 +++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100755 tools/perf/python/mem-phys-addr.py diff --git a/tools/perf/python/mem-phys-addr.py b/tools/perf/python/mem-phys-addr.py new file mode 100755 index 000000000000..ba874d7a2011 --- /dev/null +++ b/tools/perf/python/mem-phys-addr.py @@ -0,0 +1,117 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +"""mem-phys-addr.py: Resolve physical address samples""" +import argparse +import bisect +import collections +from dataclasses import dataclass +import re +from typing import (Dict, Optional) + +import perf + +@dataclass(frozen=True) +class IomemEntry: + """Read from a line in /proc/iomem""" + begin: int + end: int + indent: int + label: str + +# Physical memory layout from /proc/iomem. Key is the indent and then +# a list of ranges. +iomem: Dict[int, list[IomemEntry]] = collections.defaultdict(list) +# Child nodes from the iomem parent. +children: Dict[IomemEntry, set[IomemEntry]] = collections.defaultdict(set) +# Maximum indent seen before an entry in the iomem file. +max_indent: int = 0 +# Count for each range of memory. +load_mem_type_cnt: Dict[IomemEntry, int] = collections.Counter() +# Perf event name set from the first sample in the data. +event_name: Optional[str] = None + +def parse_iomem(iomem_path: str): + """Populate iomem from iomem file""" + global max_indent + with open(iomem_path, 'r', encoding='ascii') as f: + for line in f: + indent = 0 + while line[indent] == ' ': + indent += 1 + max_indent = max(max_indent, indent) + m = re.split('-|:', line, maxsplit=2) + begin = int(m[0], 16) + end = int(m[1], 16) + label = m[2].strip() + entry = IomemEntry(begin, end, indent, label) + # Before adding entry, search for a parent node using its begin. + if indent > 0: + parent = find_memory_type(begin) + assert parent, f"Given indent expected a parent for {label}" + children[parent].add(entry) + iomem[indent].append(entry) + +def find_memory_type(phys_addr) -> Optional[IomemEntry]: + """Search iomem for the range containing phys_addr with the maximum indent""" + for i in range(max_indent, -1, -1): + if i not in iomem: + continue + position = bisect.bisect_right(iomem[i], phys_addr, + key=lambda entry: entry.begin) + if position is None: + continue + iomem_entry = iomem[i][position-1] + if iomem_entry.begin <= phys_addr <= iomem_entry.end: + return iomem_entry + print(f"Didn't find {phys_addr}") + return None + +def print_memory_type(): + """Print the resolved memory types and their counts.""" + print(f"Event: {event_name}") + print(f"{'Memory type':<40} {'count':>10} {'percentage':>10}") + print(f"{'-' * 40:<40} {'-' * 10:>10} {'-' * 10:>10}") + total = sum(load_mem_type_cnt.values()) + # Add count from children into the parent. + for i in range(max_indent, -1, -1): + if i not in iomem: + continue + for entry in iomem[i]: + for child in children[entry]: + if load_mem_type_cnt[child] > 0: + load_mem_type_cnt[entry] += load_mem_type_cnt[child] + + def print_entries(entries): + """Print counts from parents down to their children""" + for entry in sorted(entries, + key = lambda entry: load_mem_type_cnt[entry], + reverse = True): + count = load_mem_type_cnt[entry] + if count > 0: + mem_type = ' ' * entry.indent + f"{entry.begin:x}-{entry.end:x} : {entry.label}" + percent = 100 * count / total + print(f"{mem_type:<40} {count:>10} {percent:>10.1f}") + print_entries(children[entry]) + + print_entries(iomem[0]) + +if __name__ == "__main__": + ap = argparse.ArgumentParser(description="Resolve physical address samples") + ap.add_argument("-i", "--input", default="perf.data", help="Input file name") + ap.add_argument("--iomem", default="/proc/iomem", help="Path to iomem file") + args = ap.parse_args() + + def process_event(sample): + """Process a single sample event.""" + phys_addr = sample.sample_phys_addr + entry = find_memory_type(phys_addr) + if entry: + load_mem_type_cnt[entry] += 1 + + global event_name + if event_name is None: + event_name = str(sample.evsel) + + parse_iomem(args.iomem) + perf.session(perf.data(args.input), sample=process_event).process_events() + print_memory_type() -- 2.54.0.rc2.533.g4f5dca5207-goog