419 lines
12 KiB
Perl
419 lines
12 KiB
Perl
#!/usr/bin/env perl
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# This is a POC (proof of concept or piece of crap, take your pick) for reading the
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# text representation of trace output related to page allocation. It makes an attempt
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# to extract some high-level information on what is going on. The accuracy of the parser
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# may vary considerably
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#
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# Example usage: trace-pagealloc-postprocess.pl < /sys/kernel/debug/tracing/trace_pipe
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# other options
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# --prepend-parent Report on the parent proc and PID
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# --read-procstat If the trace lacks process info, get it from /proc
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# --ignore-pid Aggregate processes of the same name together
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#
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# Copyright (c) IBM Corporation 2009
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# Author: Mel Gorman <mel@csn.ul.ie>
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use strict;
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use Getopt::Long;
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# Tracepoint events
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use constant MM_PAGE_ALLOC => 1;
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use constant MM_PAGE_FREE => 2;
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use constant MM_PAGE_FREE_BATCHED => 3;
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use constant MM_PAGE_PCPU_DRAIN => 4;
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use constant MM_PAGE_ALLOC_ZONE_LOCKED => 5;
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use constant MM_PAGE_ALLOC_EXTFRAG => 6;
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use constant EVENT_UNKNOWN => 7;
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# Constants used to track state
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use constant STATE_PCPU_PAGES_DRAINED => 8;
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use constant STATE_PCPU_PAGES_REFILLED => 9;
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# High-level events extrapolated from tracepoints
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use constant HIGH_PCPU_DRAINS => 10;
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use constant HIGH_PCPU_REFILLS => 11;
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use constant HIGH_EXT_FRAGMENT => 12;
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use constant HIGH_EXT_FRAGMENT_SEVERE => 13;
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use constant HIGH_EXT_FRAGMENT_MODERATE => 14;
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use constant HIGH_EXT_FRAGMENT_CHANGED => 15;
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my %perprocesspid;
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my %perprocess;
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my $opt_ignorepid;
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my $opt_read_procstat;
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my $opt_prepend_parent;
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# Catch sigint and exit on request
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my $sigint_report = 0;
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my $sigint_exit = 0;
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my $sigint_pending = 0;
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my $sigint_received = 0;
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sub sigint_handler {
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my $current_time = time;
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if ($current_time - 2 > $sigint_received) {
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print "SIGINT received, report pending. Hit ctrl-c again to exit\n";
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$sigint_report = 1;
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} else {
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if (!$sigint_exit) {
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print "Second SIGINT received quickly, exiting\n";
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}
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$sigint_exit++;
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}
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if ($sigint_exit > 3) {
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print "Many SIGINTs received, exiting now without report\n";
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exit;
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}
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$sigint_received = $current_time;
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$sigint_pending = 1;
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}
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$SIG{INT} = "sigint_handler";
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# Parse command line options
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GetOptions(
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'ignore-pid' => \$opt_ignorepid,
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'read-procstat' => \$opt_read_procstat,
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'prepend-parent' => \$opt_prepend_parent,
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);
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# Defaults for dynamically discovered regex's
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my $regex_fragdetails_default = 'page=([0-9a-f]*) pfn=([0-9]*) alloc_order=([-0-9]*) fallback_order=([-0-9]*) pageblock_order=([-0-9]*) alloc_migratetype=([-0-9]*) fallback_migratetype=([-0-9]*) fragmenting=([-0-9]) change_ownership=([-0-9])';
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# Dyanically discovered regex
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my $regex_fragdetails;
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# Static regex used. Specified like this for readability and for use with /o
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# (process_pid) (cpus ) ( time ) (tpoint ) (details)
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my $regex_traceevent = '\s*([a-zA-Z0-9-]*)\s*(\[[0-9]*\])\s*([0-9.]*):\s*([a-zA-Z_]*):\s*(.*)';
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my $regex_statname = '[-0-9]*\s\((.*)\).*';
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my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*';
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sub generate_traceevent_regex {
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my $event = shift;
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my $default = shift;
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my $regex;
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# Read the event format or use the default
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if (!open (FORMAT, "/sys/kernel/debug/tracing/events/$event/format")) {
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$regex = $default;
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} else {
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my $line;
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while (!eof(FORMAT)) {
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$line = <FORMAT>;
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if ($line =~ /^print fmt:\s"(.*)",.*/) {
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$regex = $1;
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$regex =~ s/%p/\([0-9a-f]*\)/g;
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$regex =~ s/%d/\([-0-9]*\)/g;
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$regex =~ s/%lu/\([0-9]*\)/g;
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}
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}
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}
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# Verify fields are in the right order
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my $tuple;
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foreach $tuple (split /\s/, $regex) {
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my ($key, $value) = split(/=/, $tuple);
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my $expected = shift;
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if ($key ne $expected) {
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print("WARNING: Format not as expected '$key' != '$expected'");
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$regex =~ s/$key=\((.*)\)/$key=$1/;
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}
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}
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if (defined shift) {
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die("Fewer fields than expected in format");
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}
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return $regex;
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}
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$regex_fragdetails = generate_traceevent_regex("kmem/mm_page_alloc_extfrag",
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$regex_fragdetails_default,
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"page", "pfn",
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"alloc_order", "fallback_order", "pageblock_order",
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"alloc_migratetype", "fallback_migratetype",
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"fragmenting", "change_ownership");
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sub read_statline($) {
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my $pid = $_[0];
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my $statline;
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if (open(STAT, "/proc/$pid/stat")) {
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$statline = <STAT>;
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close(STAT);
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}
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if ($statline eq '') {
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$statline = "-1 (UNKNOWN_PROCESS_NAME) R 0";
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}
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return $statline;
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}
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sub guess_process_pid($$) {
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my $pid = $_[0];
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my $statline = $_[1];
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if ($pid == 0) {
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return "swapper-0";
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}
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if ($statline !~ /$regex_statname/o) {
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die("Failed to math stat line for process name :: $statline");
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}
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return "$1-$pid";
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}
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sub parent_info($$) {
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my $pid = $_[0];
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my $statline = $_[1];
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my $ppid;
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if ($pid == 0) {
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return "NOPARENT-0";
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}
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if ($statline !~ /$regex_statppid/o) {
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die("Failed to match stat line process ppid:: $statline");
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}
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# Read the ppid stat line
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$ppid = $1;
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return guess_process_pid($ppid, read_statline($ppid));
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}
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sub process_events {
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my $traceevent;
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my $process_pid;
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my $cpus;
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my $timestamp;
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my $tracepoint;
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my $details;
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my $statline;
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# Read each line of the event log
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EVENT_PROCESS:
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while ($traceevent = <STDIN>) {
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if ($traceevent =~ /$regex_traceevent/o) {
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$process_pid = $1;
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$tracepoint = $4;
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if ($opt_read_procstat || $opt_prepend_parent) {
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$process_pid =~ /(.*)-([0-9]*)$/;
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my $process = $1;
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my $pid = $2;
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$statline = read_statline($pid);
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if ($opt_read_procstat && $process eq '') {
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$process_pid = guess_process_pid($pid, $statline);
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}
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if ($opt_prepend_parent) {
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$process_pid = parent_info($pid, $statline) . " :: $process_pid";
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}
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}
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# Unnecessary in this script. Uncomment if required
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# $cpus = $2;
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# $timestamp = $3;
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} else {
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next;
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}
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# Perl Switch() sucks majorly
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if ($tracepoint eq "mm_page_alloc") {
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$perprocesspid{$process_pid}->{MM_PAGE_ALLOC}++;
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} elsif ($tracepoint eq "mm_page_free") {
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$perprocesspid{$process_pid}->{MM_PAGE_FREE}++
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} elsif ($tracepoint eq "mm_page_free_batched") {
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$perprocesspid{$process_pid}->{MM_PAGE_FREE_BATCHED}++;
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} elsif ($tracepoint eq "mm_page_pcpu_drain") {
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$perprocesspid{$process_pid}->{MM_PAGE_PCPU_DRAIN}++;
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_DRAINED}++;
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} elsif ($tracepoint eq "mm_page_alloc_zone_locked") {
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$perprocesspid{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED}++;
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_REFILLED}++;
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} elsif ($tracepoint eq "mm_page_alloc_extfrag") {
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# Extract the details of the event now
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$details = $5;
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my ($page, $pfn);
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my ($alloc_order, $fallback_order, $pageblock_order);
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my ($alloc_migratetype, $fallback_migratetype);
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my ($fragmenting, $change_ownership);
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if ($details !~ /$regex_fragdetails/o) {
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print "WARNING: Failed to parse mm_page_alloc_extfrag as expected\n";
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next;
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}
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$perprocesspid{$process_pid}->{MM_PAGE_ALLOC_EXTFRAG}++;
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$page = $1;
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$pfn = $2;
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$alloc_order = $3;
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$fallback_order = $4;
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$pageblock_order = $5;
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$alloc_migratetype = $6;
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$fallback_migratetype = $7;
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$fragmenting = $8;
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$change_ownership = $9;
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if ($fragmenting) {
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAG}++;
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if ($fallback_order <= 3) {
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_SEVERE}++;
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} else {
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_MODERATE}++;
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}
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}
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if ($change_ownership) {
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_CHANGED}++;
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}
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} else {
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$perprocesspid{$process_pid}->{EVENT_UNKNOWN}++;
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}
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# Catch a full pcpu drain event
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if ($perprocesspid{$process_pid}->{STATE_PCPU_PAGES_DRAINED} &&
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$tracepoint ne "mm_page_pcpu_drain") {
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$perprocesspid{$process_pid}->{HIGH_PCPU_DRAINS}++;
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_DRAINED} = 0;
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}
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# Catch a full pcpu refill event
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if ($perprocesspid{$process_pid}->{STATE_PCPU_PAGES_REFILLED} &&
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$tracepoint ne "mm_page_alloc_zone_locked") {
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$perprocesspid{$process_pid}->{HIGH_PCPU_REFILLS}++;
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_REFILLED} = 0;
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}
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if ($sigint_pending) {
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last EVENT_PROCESS;
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}
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}
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}
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sub dump_stats {
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my $hashref = shift;
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my %stats = %$hashref;
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# Dump per-process stats
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my $process_pid;
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my $max_strlen = 0;
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# Get the maximum process name
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foreach $process_pid (keys %perprocesspid) {
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my $len = length($process_pid);
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if ($len > $max_strlen) {
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$max_strlen = $len;
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}
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}
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$max_strlen += 2;
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printf("\n");
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printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s\n",
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"Process", "Pages", "Pages", "Pages", "Pages", "PCPU", "PCPU", "PCPU", "Fragment", "Fragment", "MigType", "Fragment", "Fragment", "Unknown");
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printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s\n",
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"details", "allocd", "allocd", "freed", "freed", "pages", "drains", "refills", "Fallback", "Causing", "Changed", "Severe", "Moderate", "");
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printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s\n",
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"", "", "under lock", "direct", "pagevec", "drain", "", "", "", "", "", "", "", "");
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foreach $process_pid (keys %stats) {
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# Dump final aggregates
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if ($stats{$process_pid}->{STATE_PCPU_PAGES_DRAINED}) {
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$stats{$process_pid}->{HIGH_PCPU_DRAINS}++;
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$stats{$process_pid}->{STATE_PCPU_PAGES_DRAINED} = 0;
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}
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if ($stats{$process_pid}->{STATE_PCPU_PAGES_REFILLED}) {
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$stats{$process_pid}->{HIGH_PCPU_REFILLS}++;
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$stats{$process_pid}->{STATE_PCPU_PAGES_REFILLED} = 0;
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}
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printf("%-" . $max_strlen . "s %8d %10d %8d %8d %8d %8d %8d %8d %8d %8d %8d %8d %8d\n",
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$process_pid,
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$stats{$process_pid}->{MM_PAGE_ALLOC},
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$stats{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED},
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$stats{$process_pid}->{MM_PAGE_FREE},
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$stats{$process_pid}->{MM_PAGE_FREE_BATCHED},
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$stats{$process_pid}->{MM_PAGE_PCPU_DRAIN},
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$stats{$process_pid}->{HIGH_PCPU_DRAINS},
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$stats{$process_pid}->{HIGH_PCPU_REFILLS},
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$stats{$process_pid}->{MM_PAGE_ALLOC_EXTFRAG},
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$stats{$process_pid}->{HIGH_EXT_FRAG},
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$stats{$process_pid}->{HIGH_EXT_FRAGMENT_CHANGED},
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$stats{$process_pid}->{HIGH_EXT_FRAGMENT_SEVERE},
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$stats{$process_pid}->{HIGH_EXT_FRAGMENT_MODERATE},
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$stats{$process_pid}->{EVENT_UNKNOWN});
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}
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}
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sub aggregate_perprocesspid() {
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my $process_pid;
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my $process;
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undef %perprocess;
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foreach $process_pid (keys %perprocesspid) {
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$process = $process_pid;
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$process =~ s/-([0-9])*$//;
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if ($process eq '') {
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$process = "NO_PROCESS_NAME";
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}
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$perprocess{$process}->{MM_PAGE_ALLOC} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC};
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$perprocess{$process}->{MM_PAGE_ALLOC_ZONE_LOCKED} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED};
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$perprocess{$process}->{MM_PAGE_FREE} += $perprocesspid{$process_pid}->{MM_PAGE_FREE};
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$perprocess{$process}->{MM_PAGE_FREE_BATCHED} += $perprocesspid{$process_pid}->{MM_PAGE_FREE_BATCHED};
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$perprocess{$process}->{MM_PAGE_PCPU_DRAIN} += $perprocesspid{$process_pid}->{MM_PAGE_PCPU_DRAIN};
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$perprocess{$process}->{HIGH_PCPU_DRAINS} += $perprocesspid{$process_pid}->{HIGH_PCPU_DRAINS};
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$perprocess{$process}->{HIGH_PCPU_REFILLS} += $perprocesspid{$process_pid}->{HIGH_PCPU_REFILLS};
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$perprocess{$process}->{MM_PAGE_ALLOC_EXTFRAG} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC_EXTFRAG};
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$perprocess{$process}->{HIGH_EXT_FRAG} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAG};
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$perprocess{$process}->{HIGH_EXT_FRAGMENT_CHANGED} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_CHANGED};
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$perprocess{$process}->{HIGH_EXT_FRAGMENT_SEVERE} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_SEVERE};
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$perprocess{$process}->{HIGH_EXT_FRAGMENT_MODERATE} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_MODERATE};
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$perprocess{$process}->{EVENT_UNKNOWN} += $perprocesspid{$process_pid}->{EVENT_UNKNOWN};
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}
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}
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sub report() {
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if (!$opt_ignorepid) {
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dump_stats(\%perprocesspid);
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} else {
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aggregate_perprocesspid();
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dump_stats(\%perprocess);
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}
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}
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# Process events or signals until neither is available
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sub signal_loop() {
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my $sigint_processed;
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do {
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$sigint_processed = 0;
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process_events();
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# Handle pending signals if any
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if ($sigint_pending) {
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my $current_time = time;
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if ($sigint_exit) {
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print "Received exit signal\n";
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$sigint_pending = 0;
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}
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if ($sigint_report) {
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if ($current_time >= $sigint_received + 2) {
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report();
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$sigint_report = 0;
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$sigint_pending = 0;
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$sigint_processed = 1;
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}
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}
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}
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} while ($sigint_pending || $sigint_processed);
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}
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signal_loop();
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report();
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