# flamegraph.py - create flame graphs from perf samples # SPDX-License-Identifier: GPL-2.0 # # Usage: # # perf record -a -g -F 99 sleep 60 # perf script report flamegraph # # Combined: # # perf script flamegraph -a -F 99 sleep 60 # # Written by Andreas Gerstmayr # Flame Graphs invented by Brendan Gregg # Works in tandem with d3-flame-graph by Martin Spier # # pylint: disable=missing-module-docstring # pylint: disable=missing-class-docstring # pylint: disable=missing-function-docstring from __future__ import print_function import sys import os import io import argparse import json import subprocess # pylint: disable=too-few-public-methods class Node: def __init__(self, name, libtype): self.name = name # "root" | "kernel" | "" # "" indicates user space self.libtype = libtype self.value = 0 self.children = [] def to_json(self): return { "n": self.name, "l": self.libtype, "v": self.value, "c": self.children } class FlameGraphCLI: def __init__(self, args): self.args = args self.stack = Node("all", "root") if self.args.format == "html" and \ not os.path.isfile(self.args.template): print("Flame Graph template {} does not exist. Please install " "the js-d3-flame-graph (RPM) or libjs-d3-flame-graph (deb) " "package, specify an existing flame graph template " "(--template PATH) or another output format " "(--format FORMAT).".format(self.args.template), file=sys.stderr) sys.exit(1) @staticmethod def get_libtype_from_dso(dso): """ when kernel-debuginfo is installed, dso points to /usr/lib/debug/lib/modules/*/vmlinux """ if dso and (dso == "[kernel.kallsyms]" or dso.endswith("/vmlinux")): return "kernel" return "" @staticmethod def find_or_create_node(node, name, libtype): for child in node.children: if child.name == name: return child child = Node(name, libtype) node.children.append(child) return child def process_event(self, event): pid = event.get("sample", {}).get("pid", 0) # event["dso"] sometimes contains /usr/lib/debug/lib/modules/*/vmlinux # for user-space processes; let's use pid for kernel or user-space distinction if pid == 0: comm = event["comm"] libtype = "kernel" else: comm = "{} ({})".format(event["comm"], pid) libtype = "" node = self.find_or_create_node(self.stack, comm, libtype) if "callchain" in event: for entry in reversed(event["callchain"]): name = entry.get("sym", {}).get("name", "[unknown]") libtype = self.get_libtype_from_dso(entry.get("dso")) node = self.find_or_create_node(node, name, libtype) else: name = event.get("symbol", "[unknown]") libtype = self.get_libtype_from_dso(event.get("dso")) node = self.find_or_create_node(node, name, libtype) node.value += 1 def get_report_header(self): if self.args.input == "-": # when this script is invoked with "perf script flamegraph", # no perf.data is created and we cannot read the header of it return "" try: output = subprocess.check_output(["perf", "report", "--header-only"]) return output.decode("utf-8") except Exception as err: # pylint: disable=broad-except print("Error reading report header: {}".format(err), file=sys.stderr) return "" def trace_end(self): stacks_json = json.dumps(self.stack, default=lambda x: x.to_json()) if self.args.format == "html": report_header = self.get_report_header() options = { "colorscheme": self.args.colorscheme, "context": report_header } options_json = json.dumps(options) try: with io.open(self.args.template, encoding="utf-8") as template: output_str = ( template.read() .replace("/** @options_json **/", options_json) .replace("/** @flamegraph_json **/", stacks_json) ) except IOError as err: print("Error reading template file: {}".format(err), file=sys.stderr) sys.exit(1) output_fn = self.args.output or "flamegraph.html" else: output_str = stacks_json output_fn = self.args.output or "stacks.json" if output_fn == "-": with io.open(sys.stdout.fileno(), "w", encoding="utf-8", closefd=False) as out: out.write(output_str) else: print("dumping data to {}".format(output_fn)) try: with io.open(output_fn, "w", encoding="utf-8") as out: out.write(output_str) except IOError as err: print("Error writing output file: {}".format(err), file=sys.stderr) sys.exit(1) if __name__ == "__main__": parser = argparse.ArgumentParser(description="Create flame graphs.") parser.add_argument("-f", "--format", default="html", choices=["json", "html"], help="output file format") parser.add_argument("-o", "--output", help="output file name") parser.add_argument("--template", default="/usr/share/d3-flame-graph/d3-flamegraph-base.html", help="path to flame graph HTML template") parser.add_argument("--colorscheme", default="blue-green", help="flame graph color scheme", choices=["blue-green", "orange"]) parser.add_argument("-i", "--input", help=argparse.SUPPRESS) cli_args = parser.parse_args() cli = FlameGraphCLI(cli_args) process_event = cli.process_event trace_end = cli.trace_end y'>linux-6.5.y Hosts the 0x221E linux distro kernel.Ubuntu
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path: root/drivers/clocksource/arm_arch_timer.c
AgeCommit message (Expand)Author
2023-06-06arm64/arch_timer: Fix MMIO byteswapPeter Zijlstra
2023-06-05arm64/arch_timer: Provide noinstr sched_clock_read() functionsPeter Zijlstra
2022-12-12Merge tag 'timers-core-2022-12-10' of git://git.kernel.org/pub/scm/linux/kern...Linus Torvalds
2022-12-02clocksource/drivers/arm_arch_timer: Use kstrtobool() instead of strtobool()Christophe JAILLET
2022-12-02clocksource/drivers/arm_arch_timer: Fix XGene-1 TVAL register math errorJoe Korty
2022-11-24clocksource/drivers/arm_arch_timer: Do not use timer namespace for timer_shut...Steven Rostedt (Google)
2022-11-21clocksource/drivers/arm_arch_timer: Fix XGene-1 TVAL register math errorJoe Korty
2022-09-27clocksource/drivers/arm_arch_timer: Fix CNTPCT_LO and CNTVCT_LO valueYang Guo
2022-09-20clocksource/drivers/arm_arch_timer: Fix handling of ARM erratum 858921Kunkun Jiang
2022-03-07clocksource/drivers/arm_arch_timer: Use event stream scaling when availableMarc Zyngier
2021-12-10clocksource/drivers/arm_arch_timer: Force inlining of erratum_set_next_event_...Marc Zyngier
2021-10-18clocksource/drivers/arm_arch_timer: Fix masking for high freq countersOliver Upton
2021-10-17clocksource/drivers/arm_arch_timer: Remove any trace of the TVAL programming ...Marc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Work around broken CVAL implementationsMarc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Advertise 56bit timer to the core codeMarc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Move MMIO timer programming over to CVALMarc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Fix MMIO base address vs callback orderin...Marc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Move drop _tval from erratum function namesMarc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Move system register timer programming ov...Marc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Extend write side of timer register acces...Marc Zyngier
2021-10-17clocksource/drivers/arm_arch_timer: Drop CNT*_TVAL read accessorsMarc Zyngier
2021-10-17clocksource/arm_arch_timer: Add build-time guards for unhandled register acce...Marc Zyngier
2021-06-16clocksource/arm_arch_timer: Improve Allwinner A64 timer workaroundSamuel Holland
2021-06-03clocksource/drivers/arm_arch_timer: Remove arch_timer_rate1Jisheng Zhang
2021-05-01Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds
2021-04-26Merge tag 'arm-apple-m1-5.13' of git://git.kernel.org/pub/scm/linux/kernel/gi...Linus Torvalds