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-rwxr-xr-xthird_party/tcmalloc/chromium/src/pprof451
1 files changed, 308 insertions, 143 deletions
diff --git a/third_party/tcmalloc/chromium/src/pprof b/third_party/tcmalloc/chromium/src/pprof
index d70ee30..03bafa4 100755
--- a/third_party/tcmalloc/chromium/src/pprof
+++ b/third_party/tcmalloc/chromium/src/pprof
@@ -72,7 +72,7 @@ use strict;
use warnings;
use Getopt::Long;
-my $PPROF_VERSION = "1.5";
+my $PPROF_VERSION = "1.7";
# These are the object tools we use which can come from a
# user-specified location using --tools, from the PPROF_TOOLS
@@ -89,6 +89,7 @@ my %obj_tool_map = (
);
my $DOT = "dot"; # leave non-absolute, since it may be in /usr/local
my $GV = "gv";
+my $EVINCE = "evince"; # could also be xpdf or perhaps acroread
my $KCACHEGRIND = "kcachegrind";
my $PS2PDF = "ps2pdf";
# These are used for dynamic profiles
@@ -103,9 +104,16 @@ my $GROWTH_PAGE = "/pprof/growth";
my $CONTENTION_PAGE = "/pprof/contention";
my $WALL_PAGE = "/pprof/wall(?:\\?.*)?"; # accepts options like namefilter
my $FILTEREDPROFILE_PAGE = "/pprof/filteredprofile(?:\\?.*)?";
+my $CENSUSPROFILE_PAGE = "/pprof/censusprofile"; # must support "?seconds=#"
my $SYMBOL_PAGE = "/pprof/symbol"; # must support symbol lookup via POST
my $PROGRAM_NAME_PAGE = "/pprof/cmdline";
+# These are the web pages that can be named on the command line.
+# All the alternatives must begin with /.
+my $PROFILES = "($HEAP_PAGE|$PROFILE_PAGE|$PMUPROFILE_PAGE|" .
+ "$GROWTH_PAGE|$CONTENTION_PAGE|$WALL_PAGE|" .
+ "$FILTEREDPROFILE_PAGE|$CENSUSPROFILE_PAGE)";
+
# default binary name
my $UNKNOWN_BINARY = "(unknown)";
@@ -114,6 +122,11 @@ my $UNKNOWN_BINARY = "(unknown)";
# 64-bit profiles. To err on the safe size, default to 64-bit here:
my $address_length = 16;
+my $dev_null = "/dev/null";
+if (! -e $dev_null && $^O =~ /MSWin/) { # $^O is the OS perl was built for
+ $dev_null = "nul";
+}
+
# A list of paths to search for shared object files
my @prefix_list = ();
@@ -142,7 +155,7 @@ pprof [options] <profile>
The /<service> can be $HEAP_PAGE, $PROFILE_PAGE, /pprof/pmuprofile,
$GROWTH_PAGE, $CONTENTION_PAGE, /pprof/wall,
- or /pprof/filteredprofile.
+ $CENSUSPROFILE_PAGE, or /pprof/filteredprofile.
For instance: "pprof http://myserver.com:80$HEAP_PAGE".
If /<service> is omitted, the service defaults to $PROFILE_PAGE (cpu profiling).
pprof --symbols <program>
@@ -174,6 +187,7 @@ Output type:
--text Generate text report
--callgrind Generate callgrind format to stdout
--gv Generate Postscript and display
+ --evince Generate PDF and display
--web Generate SVG and display
--list=<regexp> Generate source listing of matching routines
--disasm=<regexp> Generate disassembly of matching routines
@@ -202,6 +216,7 @@ Call-graph Options:
--nodecount=<n> Show at most so many nodes [default=80]
--nodefraction=<f> Hide nodes below <f>*total [default=.005]
--edgefraction=<f> Hide edges below <f>*total [default=.001]
+ --maxdegree=<n> Max incoming/outgoing edges per node [default=8]
--focus=<regexp> Focus on nodes matching <regexp>
--ignore=<regexp> Ignore nodes matching <regexp>
--scale=<n> Set GV scaling [default=0]
@@ -209,7 +224,7 @@ Call-graph Options:
(i.e. direct leak generators) more visible
Miscellaneous:
- --tools=<prefix> Prefix for object tool pathnames
+ --tools=<prefix or binary:fullpath>[,...] \$PATH for object tool pathnames
--test Run unit tests
--help This message
--version Version information
@@ -298,6 +313,7 @@ sub Init() {
$main::opt_disasm = "";
$main::opt_symbols = 0;
$main::opt_gv = 0;
+ $main::opt_evince = 0;
$main::opt_web = 0;
$main::opt_dot = 0;
$main::opt_ps = 0;
@@ -309,6 +325,7 @@ sub Init() {
$main::opt_nodecount = 80;
$main::opt_nodefraction = 0.005;
$main::opt_edgefraction = 0.001;
+ $main::opt_maxdegree = 8;
$main::opt_focus = '';
$main::opt_ignore = '';
$main::opt_scale = 0;
@@ -366,6 +383,7 @@ sub Init() {
"disasm=s" => \$main::opt_disasm,
"symbols!" => \$main::opt_symbols,
"gv!" => \$main::opt_gv,
+ "evince!" => \$main::opt_evince,
"web!" => \$main::opt_web,
"dot!" => \$main::opt_dot,
"ps!" => \$main::opt_ps,
@@ -377,6 +395,7 @@ sub Init() {
"nodecount=i" => \$main::opt_nodecount,
"nodefraction=f" => \$main::opt_nodefraction,
"edgefraction=f" => \$main::opt_edgefraction,
+ "maxdegree=i" => \$main::opt_maxdegree,
"focus=s" => \$main::opt_focus,
"ignore=s" => \$main::opt_ignore,
"scale=i" => \$main::opt_scale,
@@ -446,6 +465,7 @@ sub Init() {
($main::opt_disasm eq '' ? 0 : 1) +
($main::opt_symbols == 0 ? 0 : 1) +
$main::opt_gv +
+ $main::opt_evince +
$main::opt_web +
$main::opt_dot +
$main::opt_ps +
@@ -588,6 +608,10 @@ sub Main() {
} elsif ($main::use_symbol_page) {
$symbols = FetchSymbols($pcs);
} else {
+ # TODO(csilvers): $libs uses the /proc/self/maps data from profile1,
+ # which may differ from the data from subsequent profiles, especially
+ # if they were run on different machines. Use appropriate libs for
+ # each pc somehow.
$symbols = ExtractSymbols($libs, $pcs);
}
@@ -617,7 +641,7 @@ sub Main() {
# Print
if (!$main::opt_interactive) {
if ($main::opt_disasm) {
- PrintDisassembly($libs, $flat, $cumulative, $main::opt_disasm, $total);
+ PrintDisassembly($libs, $flat, $cumulative, $main::opt_disasm);
} elsif ($main::opt_list) {
PrintListing($libs, $flat, $cumulative, $main::opt_list);
} elsif ($main::opt_text) {
@@ -627,7 +651,7 @@ sub Main() {
if ($total != 0) {
printf("Total: %s %s\n", Unparse($total), Units());
}
- PrintText($symbols, $flat, $cumulative, $total, -1);
+ PrintText($symbols, $flat, $cumulative, -1);
} elsif ($main::opt_raw) {
PrintSymbolizedProfile($symbols, $profile, $main::prog);
} elsif ($main::opt_callgrind) {
@@ -636,6 +660,8 @@ sub Main() {
if (PrintDot($main::prog, $symbols, $profile, $flat, $cumulative, $total)) {
if ($main::opt_gv) {
RunGV(TempName($main::next_tmpfile, "ps"), "");
+ } elsif ($main::opt_evince) {
+ RunEvince(TempName($main::next_tmpfile, "pdf"), "");
} elsif ($main::opt_web) {
my $tmp = TempName($main::next_tmpfile, "svg");
RunWeb($tmp);
@@ -684,7 +710,7 @@ sub ReadlineMightFail {
sub RunGV {
my $fname = shift;
my $bg = shift; # "" or " &" if we should run in background
- if (!system("$GV --version >/dev/null 2>&1")) {
+ if (!system("$GV --version >$dev_null 2>&1")) {
# Options using double dash are supported by this gv version.
# Also, turn on noantialias to better handle bug in gv for
# postscript files with large dimensions.
@@ -698,6 +724,12 @@ sub RunGV {
}
}
+sub RunEvince {
+ my $fname = shift;
+ my $bg = shift; # "" or " &" if we should run in background
+ system("$EVINCE " . $fname . $bg);
+}
+
sub RunWeb {
my $fname = shift;
print STDERR "Loading web page file:///$fname\n";
@@ -718,10 +750,8 @@ sub RunWeb {
"firefox",
);
foreach my $b (@alt) {
- if (-f $b) {
- if (system($b, $fname) == 0) {
- return;
- }
+ if (system($b, $fname) == 0) {
+ return;
}
}
@@ -797,6 +827,7 @@ sub InteractiveCommand {
$main::opt_disasm = 0;
$main::opt_list = 0;
$main::opt_gv = 0;
+ $main::opt_evince = 0;
$main::opt_cum = 0;
if (m/^\s*(text|top)(\d*)\s*(.*)/) {
@@ -815,7 +846,7 @@ sub InteractiveCommand {
my $flat = FlatProfile($reduced);
my $cumulative = CumulativeProfile($reduced);
- PrintText($symbols, $flat, $cumulative, $total, $line_limit);
+ PrintText($symbols, $flat, $cumulative, $line_limit);
return 1;
}
if (m/^\s*callgrind\s*([^ \n]*)/) {
@@ -867,14 +898,17 @@ sub InteractiveCommand {
my $flat = FlatProfile($reduced);
my $cumulative = CumulativeProfile($reduced);
- PrintDisassembly($libs, $flat, $cumulative, $routine, $total);
+ PrintDisassembly($libs, $flat, $cumulative, $routine);
return 1;
}
- if (m/^\s*(gv|web)\s*(.*)/) {
+ if (m/^\s*(gv|web|evince)\s*(.*)/) {
$main::opt_gv = 0;
+ $main::opt_evince = 0;
$main::opt_web = 0;
if ($1 eq "gv") {
$main::opt_gv = 1;
+ } elsif ($1 eq "evince") {
+ $main::opt_evince = 1;
} elsif ($1 eq "web") {
$main::opt_web = 1;
}
@@ -894,6 +928,8 @@ sub InteractiveCommand {
if (PrintDot($main::prog, $symbols, $profile, $flat, $cumulative, $total)) {
if ($main::opt_gv) {
RunGV(TempName($main::next_tmpfile, "ps"), " &");
+ } elsif ($main::opt_evince) {
+ RunEvince(TempName($main::next_tmpfile, "pdf"), " &");
} elsif ($main::opt_web) {
RunWeb(TempName($main::next_tmpfile, "svg"));
}
@@ -1106,9 +1142,10 @@ sub PrintText {
my $symbols = shift;
my $flat = shift;
my $cumulative = shift;
- my $total = shift;
my $line_limit = shift;
+ my $total = TotalProfile($flat);
+
# Which profile to sort by?
my $s = $main::opt_cum ? $cumulative : $flat;
@@ -1183,7 +1220,8 @@ sub PrintDisassembly {
my $flat = shift;
my $cumulative = shift;
my $disasm_opts = shift;
- my $total = shift;
+
+ my $total = TotalProfile($flat);
foreach my $lib (@{$libs}) {
my $symbol_table = GetProcedureBoundaries($lib->[0], $disasm_opts);
@@ -1677,6 +1715,8 @@ sub PrintDot {
my $output;
if ($main::opt_gv) {
$output = "| $DOT -Tps2 >" . TempName($main::next_tmpfile, "ps");
+ } elsif ($main::opt_evince) {
+ $output = "| $DOT -Tps2 | $PS2PDF - " . TempName($main::next_tmpfile, "pdf");
} elsif ($main::opt_ps) {
$output = "| $DOT -Tps2";
} elsif ($main::opt_pdf) {
@@ -1737,7 +1777,7 @@ sub PrintDot {
if ($f != $c) {
$extra = sprintf("\\rof %s (%s)",
Unparse($c),
- Percent($c, $overall_total));
+ Percent($c, $local_total));
}
my $style = "";
if ($main::opt_heapcheck) {
@@ -1756,7 +1796,7 @@ sub PrintDot {
$node{$a},
$sym,
Unparse($f),
- Percent($f, $overall_total),
+ Percent($f, $local_total),
$extra,
$fs,
$style,
@@ -1784,12 +1824,38 @@ sub PrintDot {
}
}
- # Print edges
- foreach my $e (keys(%edge)) {
+ # Print edges (process in order of decreasing counts)
+ my %indegree = (); # Number of incoming edges added per node so far
+ my %outdegree = (); # Number of outgoing edges added per node so far
+ foreach my $e (sort { $edge{$b} <=> $edge{$a} } keys(%edge)) {
my @x = split(/\001/, $e);
$n = $edge{$e};
- if (abs($n) > $edgelimit) {
+ # Initialize degree of kept incoming and outgoing edges if necessary
+ my $src = $x[0];
+ my $dst = $x[1];
+ if (!exists($outdegree{$src})) { $outdegree{$src} = 0; }
+ if (!exists($indegree{$dst})) { $indegree{$dst} = 0; }
+
+ my $keep;
+ if ($indegree{$dst} == 0) {
+ # Keep edge if needed for reachability
+ $keep = 1;
+ } elsif (abs($n) <= $edgelimit) {
+ # Drop if we are below --edgefraction
+ $keep = 0;
+ } elsif ($outdegree{$src} >= $main::opt_maxdegree ||
+ $indegree{$dst} >= $main::opt_maxdegree) {
+ # Keep limited number of in/out edges per node
+ $keep = 0;
+ } else {
+ $keep = 1;
+ }
+
+ if ($keep) {
+ $outdegree{$src}++;
+ $indegree{$dst}++;
+
# Compute line width based on edge count
my $fraction = abs($local_total ? (3 * ($n / $local_total)) : 0);
if ($fraction > 1) { $fraction = 1; }
@@ -2127,6 +2193,19 @@ function handleMouseUp(evt) {
EOF
}
+# Return a small number that identifies the argument.
+# Multiple calls with the same argument will return the same number.
+# Calls with different arguments will return different numbers.
+sub ShortIdFor {
+ my $key = shift;
+ my $id = $main::uniqueid{$key};
+ if (!defined($id)) {
+ $id = keys(%main::uniqueid) + 1;
+ $main::uniqueid{$key} = $id;
+ }
+ return $id;
+}
+
# Translate a stack of addresses into a stack of symbols
sub TranslateStack {
my $symbols = shift;
@@ -2164,6 +2243,15 @@ sub TranslateStack {
if ($j > 2) {
$func = "$func (inline)";
}
+
+ # Do not merge nodes corresponding to Callback::Run since that
+ # causes confusing cycles in dot display. Instead, we synthesize
+ # a unique name for this frame per caller.
+ if ($func =~ m/Callback.*::Run$/) {
+ my $caller = ($i > 0) ? $addrs[$i-1] : 0;
+ $func = "Run#" . ShortIdFor($caller);
+ }
+
if ($main::opt_addresses) {
push(@result, "$a $func $fileline");
} elsif ($main::opt_lines) {
@@ -2407,7 +2495,16 @@ sub RemoveUninterestingFrames {
# old code out of the system.
$skip_regexp = "TCMalloc|^tcmalloc::";
} elsif ($main::profile_type eq 'contention') {
- foreach my $vname ('Mutex::Unlock', 'Mutex::UnlockSlow') {
+ foreach my $vname ('base::RecordLockProfileData',
+ 'base::SubmitMutexProfileData',
+ 'base::SubmitSpinLockProfileData',
+ 'Mutex::Unlock',
+ 'Mutex::UnlockSlow',
+ 'Mutex::ReaderUnlock',
+ 'MutexLock::~MutexLock',
+ 'SpinLock::Unlock',
+ 'SpinLock::SlowUnlock',
+ 'SpinLockHolder::~SpinLockHolder') {
$skip{$vname} = 1;
}
} elsif ($main::profile_type eq 'cpu') {
@@ -2704,32 +2801,44 @@ sub CheckSymbolPage {
sub IsProfileURL {
my $profile_name = shift;
- my ($host, $port, $prefix, $path) = ParseProfileURL($profile_name);
- return defined($host) and defined($port) and defined($path);
+ if (-f $profile_name) {
+ printf STDERR "Using local file $profile_name.\n";
+ return 0;
+ }
+ return 1;
}
sub ParseProfileURL {
my $profile_name = shift;
- if (defined($profile_name) &&
- $profile_name =~ m,^(http://|)([^/:]+):(\d+)(|\@\d+)(|/|(.*?)($PROFILE_PAGE|$PMUPROFILE_PAGE|$HEAP_PAGE|$GROWTH_PAGE|$CONTENTION_PAGE|$WALL_PAGE|$FILTEREDPROFILE_PAGE))$,o) {
- # $7 is $PROFILE_PAGE/$HEAP_PAGE/etc. $5 is *everything* after
- # the hostname, as long as that everything is the empty string,
- # a slash, or something ending in $PROFILE_PAGE/$HEAP_PAGE/etc.
- # So "$7 || $5" is $PROFILE_PAGE/etc if there, or else it's "/" or "".
- return ($2, $3, $6, $7 || $5);
- }
- return ();
+
+ if (!defined($profile_name) || $profile_name eq "") {
+ return ();
+ }
+
+ # Split profile URL - matches all non-empty strings, so no test.
+ $profile_name =~ m,^(https?://)?([^/]+)(.*?)(/|$PROFILES)?$,;
+
+ my $proto = $1 || "http://";
+ my $hostport = $2;
+ my $prefix = $3;
+ my $profile = $4 || "/";
+
+ my $host = $hostport;
+ $host =~ s/:.*//;
+
+ my $baseurl = "$proto$hostport$prefix";
+ return ($host, $baseurl, $profile);
}
# We fetch symbols from the first profile argument.
sub SymbolPageURL {
- my ($host, $port, $prefix, $path) = ParseProfileURL($main::pfile_args[0]);
- return "http://$host:$port$prefix$SYMBOL_PAGE";
+ my ($host, $baseURL, $path) = ParseProfileURL($main::pfile_args[0]);
+ return "$baseURL$SYMBOL_PAGE";
}
sub FetchProgramName() {
- my ($host, $port, $prefix, $path) = ParseProfileURL($main::pfile_args[0]);
- my $url = "http://$host:$port$prefix$PROGRAM_NAME_PAGE";
+ my ($host, $baseURL, $path) = ParseProfileURL($main::pfile_args[0]);
+ my $url = "$baseURL$PROGRAM_NAME_PAGE";
my $command_line = "$URL_FETCHER '$url'";
open(CMDLINE, "$command_line |") or error($command_line);
my $cmdline = <CMDLINE>;
@@ -2880,10 +2989,10 @@ sub BaseName {
sub MakeProfileBaseName {
my ($binary_name, $profile_name) = @_;
- my ($host, $port, $prefix, $path) = ParseProfileURL($profile_name);
+ my ($host, $baseURL, $path) = ParseProfileURL($profile_name);
my $binary_shortname = BaseName($binary_name);
- return sprintf("%s.%s.%s-port%s",
- $binary_shortname, $main::op_time, $host, $port);
+ return sprintf("%s.%s.%s",
+ $binary_shortname, $main::op_time, $host);
}
sub FetchDynamicProfile {
@@ -2895,7 +3004,7 @@ sub FetchDynamicProfile {
if (!IsProfileURL($profile_name)) {
return $profile_name;
} else {
- my ($host, $port, $prefix, $path) = ParseProfileURL($profile_name);
+ my ($host, $baseURL, $path) = ParseProfileURL($profile_name);
if ($path eq "" || $path eq "/") {
# Missing type specifier defaults to cpu-profile
$path = $PROFILE_PAGE;
@@ -2903,33 +3012,26 @@ sub FetchDynamicProfile {
my $profile_file = MakeProfileBaseName($binary_name, $profile_name);
- my $url;
+ my $url = "$baseURL$path";
my $fetch_timeout = undef;
- if (($path =~ m/$PROFILE_PAGE/) || ($path =~ m/$PMUPROFILE_PAGE/)) {
- if ($path =~ m/$PROFILE_PAGE/) {
- $url = sprintf("http://$host:$port$prefix$path?seconds=%d",
- $main::opt_seconds);
+ if ($path =~ m/$PROFILE_PAGE|$PMUPROFILE_PAGE/) {
+ if ($path =~ m/[?]/) {
+ $url .= "&";
} else {
- if ($profile_name =~ m/[?]/) {
- $profile_name .= "&"
- } else {
- $profile_name .= "?"
- }
- $url = sprintf("http://$profile_name" . "seconds=%d",
- $main::opt_seconds);
+ $url .= "?";
}
+ $url .= sprintf("seconds=%d", $main::opt_seconds);
$fetch_timeout = $main::opt_seconds * 1.01 + 60;
} else {
# For non-CPU profiles, we add a type-extension to
# the target profile file name.
my $suffix = $path;
$suffix =~ s,/,.,g;
- $profile_file .= "$suffix";
- $url = "http://$host:$port$prefix$path";
+ $profile_file .= $suffix;
}
my $profile_dir = $ENV{"PPROF_TMPDIR"} || ($ENV{HOME} . "/pprof");
- if (!(-d $profile_dir)) {
+ if (! -d $profile_dir) {
mkdir($profile_dir)
|| die("Unable to create profile directory $profile_dir: $!\n");
}
@@ -2942,13 +3044,13 @@ sub FetchDynamicProfile {
my $fetcher = AddFetchTimeout($URL_FETCHER, $fetch_timeout);
my $cmd = "$fetcher '$url' > '$tmp_profile'";
- if (($path =~ m/$PROFILE_PAGE/) || ($path =~ m/$PMUPROFILE_PAGE/)){
+ if ($path =~ m/$PROFILE_PAGE|$PMUPROFILE_PAGE|$CENSUSPROFILE_PAGE/){
print STDERR "Gathering CPU profile from $url for $main::opt_seconds seconds to\n ${real_profile}\n";
if ($encourage_patience) {
print STDERR "Be patient...\n";
}
} else {
- print STDERR "Fetching $path profile from $host:$port to\n ${real_profile}\n";
+ print STDERR "Fetching $path profile from $url to\n ${real_profile}\n";
}
(system($cmd) == 0) || error("Failed to get profile: $cmd: $!\n");
@@ -3034,6 +3136,7 @@ BEGIN {
stride => 512 * 1024, # must be a multiple of bitsize/8
slots => [],
unpack_code => "", # N for big-endian, V for little
+ perl_is_64bit => 1, # matters if profile is 64-bit
};
bless $self, $class;
# Let unittests adjust the stride
@@ -3057,17 +3160,15 @@ BEGIN {
}
@$slots = unpack($self->{unpack_code} . "*", $str);
} else {
- # If we're a 64-bit profile, make sure we're a 64-bit-capable
+ # If we're a 64-bit profile, check if we're a 64-bit-capable
# perl. Otherwise, each slot will be represented as a float
# instead of an int64, losing precision and making all the
- # 64-bit addresses right. We *could* try to handle this with
- # software emulation of 64-bit ints, but that's added complexity
- # for no clear benefit (yet). We use 'Q' to test for 64-bit-ness;
- # perl docs say it's only available on 64-bit perl systems.
+ # 64-bit addresses wrong. We won't complain yet, but will
+ # later if we ever see a value that doesn't fit in 32 bits.
my $has_q = 0;
eval { $has_q = pack("Q", "1") ? 1 : 1; };
if (!$has_q) {
- ::error("$fname: need a 64-bit perl to process this 64-bit profile.\n");
+ $self->{perl_is_64bit} = 0;
}
read($self->{file}, $str, 8);
if (substr($str, 4, 4) eq chr(0)x4) {
@@ -3103,11 +3204,17 @@ BEGIN {
# TODO(csilvers): if this is a 32-bit perl, the math below
# could end up in a too-large int, which perl will promote
# to a double, losing necessary precision. Deal with that.
- if ($self->{unpack_code} eq 'V') { # little-endian
- push(@b64_values, $b32_values[$i] + $b32_values[$i+1] * (2**32));
- } else {
- push(@b64_values, $b32_values[$i] * (2**32) + $b32_values[$i+1]);
- }
+ # Right now, we just die.
+ my ($lo, $hi) = ($b32_values[$i], $b32_values[$i+1]);
+ if ($self->{unpack_code} eq 'N') { # big-endian
+ ($lo, $hi) = ($hi, $lo);
+ }
+ my $value = $lo + $hi * (2**32);
+ if (!$self->{perl_is_64bit} && # check value is exactly represented
+ (($value % (2**32)) != $lo || int($value / (2**32)) != $hi)) {
+ ::error("Need a 64-bit perl to process this 64-bit profile.\n");
+ }
+ push(@b64_values, $value);
}
@$slots = @b64_values;
}
@@ -3136,24 +3243,47 @@ BEGIN {
}
}
-# Return the next line from the profile file, assuming it's a text
-# line (which in this case means, doesn't start with a NUL byte). If
-# it's not a text line, return "". At EOF, return undef, like perl does.
-# Input file should be in binmode.
-sub ReadProfileLine {
+# Reads the top, 'header' section of a profile, and returns the last
+# line of the header, commonly called a 'header line'. The header
+# section of a profile consists of zero or more 'command' lines that
+# are instructions to pprof, which pprof executes when reading the
+# header. All 'command' lines start with a %. After the command
+# lines is the 'header line', which is a profile-specific line that
+# indicates what type of profile it is, and perhaps other global
+# information about the profile. For instance, here's a header line
+# for a heap profile:
+# heap profile: 53: 38236 [ 5525: 1284029] @ heapprofile
+# For historical reasons, the CPU profile does not contain a text-
+# readable header line. If the profile looks like a CPU profile,
+# this function returns "". If no header line could be found, this
+# function returns undef.
+#
+# The following commands are recognized:
+# %warn -- emit the rest of this line to stderr, prefixed by 'WARNING:'
+#
+# The input file should be in binmode.
+sub ReadProfileHeader {
local *PROFILE = shift;
my $firstchar = "";
my $line = "";
read(PROFILE, $firstchar, 1);
- seek(PROFILE, -1, 1); # unread the firstchar
- if ($firstchar eq "\0") {
+ seek(PROFILE, -1, 1); # unread the firstchar
+ if ($firstchar !~ /[[:print:]]/) { # is not a text character
return "";
}
- $line = <PROFILE>;
- if (defined($line)) {
+ while (defined($line = <PROFILE>)) {
$line =~ s/\r//g; # turn windows-looking lines into unix-looking lines
+ if ($line =~ /^%warn\s+(.*)/) { # 'warn' command
+ # Note this matches both '%warn blah\n' and '%warn\n'.
+ print STDERR "WARNING: $1\n"; # print the rest of the line
+ } elsif ($line =~ /^%/) {
+ print STDERR "Ignoring unknown command from profile header: $line";
+ } else {
+ # End of commands, must be the header line.
+ return $line;
+ }
}
- return $line;
+ return undef; # got to EOF without seeing a header line
}
sub IsSymbolizedProfileFile {
@@ -3164,7 +3294,7 @@ sub IsSymbolizedProfileFile {
# Check if the file contains a symbol-section marker.
open(TFILE, "<$file_name");
binmode TFILE;
- my $firstline = ReadProfileLine(*TFILE);
+ my $firstline = ReadProfileHeader(*TFILE);
close(TFILE);
if (!$firstline) {
return 0;
@@ -3184,14 +3314,7 @@ sub IsSymbolizedProfileFile {
sub ReadProfile {
my $prog = shift;
my $fname = shift;
-
- if (IsSymbolizedProfileFile($fname) && !$main::use_symbolized_profile) {
- # we have both a binary and symbolized profiles, abort
- usage("Symbolized profile '$fname' cannot be used with a binary arg. " .
- "Try again without passing '$prog'.");
- }
-
- $main::profile_type = '';
+ my $result; # return value
$CONTENTION_PAGE =~ m,[^/]+$,; # matches everything after the last slash
my $contention_marker = $&;
@@ -3208,40 +3331,45 @@ sub ReadProfile {
# whole firstline, since it may be gigabytes(!) of data.
open(PROFILE, "<$fname") || error("$fname: $!\n");
binmode PROFILE; # New perls do UTF-8 processing
- my $header = ReadProfileLine(*PROFILE);
+ my $header = ReadProfileHeader(*PROFILE);
if (!defined($header)) { # means "at EOF"
error("Profile is empty.\n");
}
my $symbols;
if ($header =~ m/^--- *$symbol_marker/o) {
+ # Verify that the user asked for a symbolized profile
+ if (!$main::use_symbolized_profile) {
+ # we have both a binary and symbolized profiles, abort
+ error("FATAL ERROR: Symbolized profile\n $fname\ncannot be used with " .
+ "a binary arg. Try again without passing\n $prog\n");
+ }
# Read the symbol section of the symbolized profile file.
$symbols = ReadSymbols(*PROFILE{IO});
# Read the next line to get the header for the remaining profile.
- $header = ReadProfileLine(*PROFILE) || "";
+ $header = ReadProfileHeader(*PROFILE) || "";
}
- my $result;
-
+ $main::profile_type = '';
if ($header =~ m/^heap profile:.*$growth_marker/o) {
$main::profile_type = 'growth';
- $result = ReadHeapProfile($prog, $fname, $header);
+ $result = ReadHeapProfile($prog, *PROFILE, $header);
} elsif ($header =~ m/^heap profile:/) {
$main::profile_type = 'heap';
- $result = ReadHeapProfile($prog, $fname, $header);
+ $result = ReadHeapProfile($prog, *PROFILE, $header);
} elsif ($header =~ m/^--- *$contention_marker/o) {
$main::profile_type = 'contention';
- $result = ReadSynchProfile($prog, $fname);
+ $result = ReadSynchProfile($prog, *PROFILE);
} elsif ($header =~ m/^--- *Stacks:/) {
print STDERR
"Old format contention profile: mistakenly reports " .
"condition variable signals as lock contentions.\n";
$main::profile_type = 'contention';
- $result = ReadSynchProfile($prog, $fname);
+ $result = ReadSynchProfile($prog, *PROFILE);
} elsif ($header =~ m/^--- *$profile_marker/) {
# the binary cpu profile data starts immediately after this line
$main::profile_type = 'cpu';
- $result = ReadCPUProfile($prog, $fname);
+ $result = ReadCPUProfile($prog, $fname, *PROFILE);
} else {
if (defined($symbols)) {
# a symbolized profile contains a format we don't recognize, bail out
@@ -3249,9 +3377,11 @@ sub ReadProfile {
}
# no ascii header present -- must be a CPU profile
$main::profile_type = 'cpu';
- $result = ReadCPUProfile($prog, $fname);
+ $result = ReadCPUProfile($prog, $fname, *PROFILE);
}
+ close(PROFILE);
+
# if we got symbols along with the profile, return those as well
if (defined($symbols)) {
$result->{symbols} = $symbols;
@@ -3290,7 +3420,8 @@ sub FixCallerAddresses {
# CPU profile reader
sub ReadCPUProfile {
my $prog = shift;
- my $fname = shift;
+ my $fname = shift; # just used for logging
+ local *PROFILE = shift;
my $version;
my $period;
my $i;
@@ -3357,7 +3488,6 @@ sub ReadCPUProfile {
my $map = '';
seek(PROFILE, $i * 4, 0);
read(PROFILE, $map, (stat PROFILE)[7]);
- close(PROFILE);
my $r = {};
$r->{version} = $version;
@@ -3371,7 +3501,7 @@ sub ReadCPUProfile {
sub ReadHeapProfile {
my $prog = shift;
- my $fname = shift;
+ local *PROFILE = shift;
my $header = shift;
my $index = 1;
@@ -3513,16 +3643,18 @@ sub ReadHeapProfile {
# The sampling frequency is the rate of a Poisson process.
# This means that the probability of sampling an allocation of
# size X with sampling rate Y is 1 - exp(-X/Y)
- my $ratio;
- $ratio = (($s1*1.0)/$n1)/($sample_adjustment);
- my $scale_factor;
- $scale_factor = 1/(1 - exp(-$ratio));
- $n1 *= $scale_factor;
- $s1 *= $scale_factor;
- $ratio = (($s2*1.0)/$n2)/($sample_adjustment);
- $scale_factor = 1/(1 - exp(-$ratio));
- $n2 *= $scale_factor;
- $s2 *= $scale_factor;
+ if ($n1 != 0) {
+ my $ratio = (($s1*1.0)/$n1)/($sample_adjustment);
+ my $scale_factor = 1/(1 - exp(-$ratio));
+ $n1 *= $scale_factor;
+ $s1 *= $scale_factor;
+ }
+ if ($n2 != 0) {
+ my $ratio = (($s2*1.0)/$n2)/($sample_adjustment);
+ my $scale_factor = 1/(1 - exp(-$ratio));
+ $n2 *= $scale_factor;
+ $s2 *= $scale_factor;
+ }
} else {
# Remote-heap version 1
my $ratio;
@@ -3554,7 +3686,9 @@ sub ReadHeapProfile {
}
sub ReadSynchProfile {
- my ($prog, $fname, $header) = @_;
+ my $prog = shift;
+ local *PROFILE = shift;
+ my $header = shift;
my $map = '';
my $profile = {};
@@ -3629,7 +3763,6 @@ sub ReadSynchProfile {
$map .= $line;
}
}
- close PROFILE;
if (!$seen_clockrate) {
printf STDERR ("No cycles/second entry in profile; Guessing %.1f GHz\n",
@@ -4073,9 +4206,15 @@ sub ExtractSymbols {
my $symbols = {};
- # Map each PC value to the containing library
- my %seen = ();
- foreach my $lib (@{$libs}) {
+ # Map each PC value to the containing library. To make this faster,
+ # we sort libraries by their starting pc value (highest first), and
+ # advance through the libraries as we advance the pc. Sometimes the
+ # addresses of libraries may overlap with the addresses of the main
+ # binary, so to make sure the libraries 'win', we iterate over the
+ # libraries in reverse order (which assumes the binary doesn't start
+ # in the middle of a library, which seems a fair assumption).
+ my @pcs = (sort { $a cmp $b } keys(%{$pcset})); # pcset is 0-extended strings
+ foreach my $lib (sort {$b->[1] cmp $a->[1]} @{$libs}) {
my $libname = $lib->[0];
my $start = $lib->[1];
my $finish = $lib->[2];
@@ -4083,12 +4222,21 @@ sub ExtractSymbols {
# Get list of pcs that belong in this library.
my $contained = [];
- foreach my $pc (keys(%{$pcset})) {
- if (!$seen{$pc} && ($pc ge $start) && ($pc le $finish)) {
- $seen{$pc} = 1;
- push(@{$contained}, $pc);
- }
- }
+ my ($start_pc_index, $finish_pc_index);
+ # Find smallest finish_pc_index such that $finish < $pc[$finish_pc_index].
+ for ($finish_pc_index = $#pcs + 1; $finish_pc_index > 0;
+ $finish_pc_index--) {
+ last if $pcs[$finish_pc_index - 1] le $finish;
+ }
+ # Find smallest start_pc_index such that $start <= $pc[$start_pc_index].
+ for ($start_pc_index = $finish_pc_index; $start_pc_index > 0;
+ $start_pc_index--) {
+ last if $pcs[$start_pc_index - 1] lt $start;
+ }
+ # This keeps PC values higher than $pc[$finish_pc_index] in @pcs,
+ # in case there are overlaps in libraries and the main binary.
+ @{$contained} = splice(@pcs, $start_pc_index,
+ $finish_pc_index - $start_pc_index);
# Map to symbols
MapToSymbols($libname, AddressSub($start, $offset), $contained, $symbols);
}
@@ -4118,7 +4266,7 @@ sub MapToSymbols {
# If "addr2line" isn't installed on the system at all, just use
# nm to get what info we can (function names, but not line numbers).
- if (system("$addr2line --help >/dev/null 2>&1") != 0) {
+ if (system("$addr2line --help >$dev_null 2>&1") != 0) {
MapSymbolsWithNM($image, $offset, $pclist, $symbols);
return;
}
@@ -4136,7 +4284,7 @@ sub MapToSymbols {
if (defined($sep_address)) {
# Only add " -i" to addr2line if the binary supports it.
# addr2line --help returns 0, but not if it sees an unknown flag first.
- if (system("$cmd -i --help >/dev/null 2>&1") == 0) {
+ if (system("$cmd -i --help >$dev_null 2>&1") == 0) {
$cmd .= " -i";
} else {
$sep_address = undef; # no need for sep_address if we don't support -i
@@ -4282,8 +4430,16 @@ sub ConfigureObjTools {
# predictably return error status in prod.
(-e $prog_file) || error("$prog_file does not exist.\n");
- # Follow symlinks (at least for systems where "file" supports that)
- my $file_type = `/usr/bin/file -L $prog_file 2>/dev/null || /usr/bin/file $prog_file`;
+ my $file_type = undef;
+ if (-e "/usr/bin/file") {
+ # Follow symlinks (at least for systems where "file" supports that).
+ $file_type = `/usr/bin/file -L $prog_file 2>$dev_null || /usr/bin/file $prog_file`;
+ } elsif ($^O == "MSWin32") {
+ $file_type = "MS Windows";
+ } else {
+ print STDERR "WARNING: Can't determine the file type of $prog_file";
+ }
+
if ($file_type =~ /64-bit/) {
# Change $address_length to 16 if the program file is ELF 64-bit.
# We can't detect this from many (most?) heap or lock contention
@@ -4322,18 +4478,27 @@ sub ConfigureTool {
my $tool = shift;
my $path;
- if ($main::opt_tools ne "") {
- # Use a prefix specified by the --tools option...
- $path = $main::opt_tools . $tool;
- if (!-x $path) {
- error("No '$tool' found with prefix specified by --tools $main::opt_tools\n");
+ # --tools (or $PPROF_TOOLS) is a comma separated list, where each
+ # item is either a) a pathname prefix, or b) a map of the form
+ # <tool>:<path>. First we look for an entry of type (b) for our
+ # tool. If one is found, we use it. Otherwise, we consider all the
+ # pathname prefixes in turn, until one yields an existing file. If
+ # none does, we use a default path.
+ my $tools = $main::opt_tools || $ENV{"PPROF_TOOLS"} || "";
+ if ($tools =~ m/(,|^)\Q$tool\E:([^,]*)/) {
+ $path = $2;
+ # TODO(csilvers): sanity-check that $path exists? Hard if it's relative.
+ } elsif ($tools ne '') {
+ foreach my $prefix (split(',', $tools)) {
+ next if ($prefix =~ /:/); # ignore "tool:fullpath" entries in the list
+ if (-x $prefix . $tool) {
+ $path = $prefix . $tool;
+ last;
+ }
}
- } elsif (exists $ENV{"PPROF_TOOLS"} &&
- $ENV{"PPROF_TOOLS"} ne "") {
- #... or specified with the PPROF_TOOLS environment variable...
- $path = $ENV{"PPROF_TOOLS"} . $tool;
- if (!-x $path) {
- error("No '$tool' found with prefix specified by PPROF_TOOLS=$ENV{PPROF_TOOLS}\n");
+ if (!$path) {
+ error("No '$tool' found with prefix specified by " .
+ "--tools (or \$PPROF_TOOLS) '$tools'\n");
}
} else {
# ... otherwise use the version that exists in the same directory as
@@ -4486,16 +4651,16 @@ sub GetProcedureBoundaries {
# --demangle and -f.
my $demangle_flag = "";
my $cppfilt_flag = "";
- if (system("$nm --demangle $image >/dev/null 2>&1") == 0) {
+ if (system("$nm --demangle $image >$dev_null 2>&1") == 0) {
# In this mode, we do "nm --demangle <foo>"
$demangle_flag = "--demangle";
$cppfilt_flag = "";
- } elsif (system("$cppfilt $image >/dev/null 2>&1") == 0) {
+ } elsif (system("$cppfilt $image >$dev_null 2>&1") == 0) {
# In this mode, we do "nm <foo> | c++filt"
$cppfilt_flag = " | $cppfilt";
};
my $flatten_flag = "";
- if (system("$nm -f $image >/dev/null 2>&1") == 0) {
+ if (system("$nm -f $image >$dev_null 2>&1") == 0) {
$flatten_flag = "-f";
}
@@ -4503,11 +4668,11 @@ sub GetProcedureBoundaries {
# -D to at least get *exported* symbols. If we can't use --demangle,
# we use c++filt instead, if it exists on this system.
my @nm_commands = ("$nm -n $flatten_flag $demangle_flag" .
- " $image 2>/dev/null $cppfilt_flag",
+ " $image 2>$dev_null $cppfilt_flag",
"$nm -D -n $flatten_flag $demangle_flag" .
- " $image 2>/dev/null $cppfilt_flag",
+ " $image 2>$dev_null $cppfilt_flag",
# 6nm is for Go binaries
- "6nm $image 2>/dev/null | sort",
+ "6nm $image 2>$dev_null | sort",
);
# If the executable is an MS Windows PDB-format executable, we'll
@@ -4516,7 +4681,7 @@ sub GetProcedureBoundaries {
# PDB-format executables can apparently include dwarf .o files.
if (exists $obj_tool_map{"nm_pdb"}) {
my $nm_pdb = $obj_tool_map{"nm_pdb"};
- push(@nm_commands, "$nm_pdb --demangle $image 2>/dev/null");
+ push(@nm_commands, "$nm_pdb --demangle $image 2>$dev_null");
}
foreach my $nm_command (@nm_commands) {
generated by cgit v1.1 at 2025-11-01 16:07:19 +0000