From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- scripts/bootgraph.pl | 224 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100755 scripts/bootgraph.pl (limited to 'scripts/bootgraph.pl') diff --git a/scripts/bootgraph.pl b/scripts/bootgraph.pl new file mode 100755 index 000000000..79c903292 --- /dev/null +++ b/scripts/bootgraph.pl @@ -0,0 +1,224 @@ +#!/usr/bin/env perl +# SPDX-License-Identifier: GPL-2.0-only + +# Copyright 2008, Intel Corporation +# +# This file is part of the Linux kernel +# +# Authors: +# Arjan van de Ven + + +# +# This script turns a dmesg output into a SVG graphic that shows which +# functions take how much time. You can view SVG graphics with various +# programs, including Inkscape, The Gimp and Firefox. +# +# +# For this script to work, the kernel needs to be compiled with the +# CONFIG_PRINTK_TIME configuration option enabled, and with +# "initcall_debug" passed on the kernel command line. +# +# usage: +# dmesg | perl scripts/bootgraph.pl > output.svg +# + +use strict; +use Getopt::Long; +my $header = 0; + +sub help { + my $text = << "EOM"; +Usage: +1) dmesg | perl scripts/bootgraph.pl [OPTION] > output.svg +2) perl scripts/bootgraph.pl -h + +Options: + -header Insert kernel version and date +EOM + my $std=shift; + if ($std == 1) { + print STDERR $text; + } else { + print $text; + } + exit; +} + +GetOptions( + 'h|help' =>\&help, + 'header' =>\$header +); + +my %start; +my %end; +my %type; +my $done = 0; +my $maxtime = 0; +my $firsttime = 99999; +my $count = 0; +my %pids; +my %pidctr; + +my $headerstep = 20; +my $xheader = 15; +my $yheader = 25; +my $cyheader = 0; + +while (<>) { + my $line = $_; + if ($line =~ /([0-9\.]+)\] calling ([a-zA-Z0-9\_\.]+)\+/) { + my $func = $2; + if ($done == 0) { + $start{$func} = $1; + $type{$func} = 0; + if ($1 < $firsttime) { + $firsttime = $1; + } + } + if ($line =~ /\@ ([0-9]+)/) { + $pids{$func} = $1; + } + $count = $count + 1; + } + + if ($line =~ /([0-9\.]+)\] async_waiting @ ([0-9]+)/) { + my $pid = $2; + my $func; + if (!defined($pidctr{$pid})) { + $func = "wait_" . $pid . "_1"; + $pidctr{$pid} = 1; + } else { + $pidctr{$pid} = $pidctr{$pid} + 1; + $func = "wait_" . $pid . "_" . $pidctr{$pid}; + } + if ($done == 0) { + $start{$func} = $1; + $type{$func} = 1; + if ($1 < $firsttime) { + $firsttime = $1; + } + } + $pids{$func} = $pid; + $count = $count + 1; + } + + if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z0-9\_\.]+)\+.*returned/) { + if ($done == 0) { + $end{$2} = $1; + $maxtime = $1; + } + } + + if ($line =~ /([0-9\.]+)\] async_continuing @ ([0-9]+)/) { + my $pid = $2; + my $func = "wait_" . $pid . "_" . $pidctr{$pid}; + $end{$func} = $1; + $maxtime = $1; + } + if ($line =~ /Write protecting the/) { + $done = 1; + } + if ($line =~ /Freeing unused kernel memory/) { + $done = 1; + } +} + +if ($count == 0) { + print STDERR < \n"; +print "\n"; + + +if ($header) { + my $version = `uname -a`; + my $date = `date`; + print "Kernel version: $version\n"; + $cyheader = $yheader+$headerstep; + print "Date: $date\n"; +} + +my @styles; + +$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[8] = "fill:rgb(255,0,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[9] = "fill:rgb(255,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[10] = "fill:rgb(255,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; +$styles[11] = "fill:rgb(128,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)"; + +my $style_wait = "fill:rgb(128,128,128);fill-opacity:0.5;stroke-width:0;stroke:rgb(0,0,0)"; + +my $mult = 1950.0 / ($maxtime - $firsttime); +my $threshold2 = ($maxtime - $firsttime) / 120.0; +my $threshold = $threshold2/10; +my $stylecounter = 0; +my %rows; +my $rowscount = 1; +my @initcalls = sort { $start{$a} <=> $start{$b} } keys(%start); + +foreach my $key (@initcalls) { + my $duration = $end{$key} - $start{$key}; + + if ($duration >= $threshold) { + my ($s, $s2, $s3, $e, $w, $y, $y2, $style); + my $pid = $pids{$key}; + + if (!defined($rows{$pid})) { + $rows{$pid} = $rowscount; + $rowscount = $rowscount + 1; + } + $s = ($start{$key} - $firsttime) * $mult; + $s2 = $s + 6; + $s3 = $s + 1; + $e = ($end{$key} - $firsttime) * $mult; + $w = $e - $s; + + $y = $rows{$pid} * 150; + $y2 = $y + 4; + + $style = $styles[$stylecounter]; + $stylecounter = $stylecounter + 1; + if ($stylecounter > 11) { + $stylecounter = 0; + }; + + if ($type{$key} == 1) { + $y = $y + 15; + print "\n"; + } else { + print "\n"; + if ($duration >= $threshold2) { + print "$key\n"; + } else { + print "$key\n"; + } + } + } +} + + +# print the time line on top +my $time = $firsttime; +my $step = ($maxtime - $firsttime) / 15; +while ($time < $maxtime) { + my $s3 = ($time - $firsttime) * $mult; + my $tm = int($time * 100) / 100.0; + print "$tm\n"; + $time = $time + $step; +} + +print "\n"; -- cgit v1.3.1