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#!/usr/bin/perl
# This is a POC for reading the text representation of trace output related to
# page reclaim. It makes an attempt to extract some high-level information on
# what is going on. The accuracy of the parser may vary
#
# Example usage: trace-vmscan-postprocess.pl < /sys/kernel/debug/tracing/trace_pipe
# other options
# --read-procstat If the trace lacks process info, get it from /proc
# --ignore-pid Aggregate processes of the same name together
#
# Copyright (c) IBM Corporation 2009
# Author: Mel Gorman <mel@csn.ul.ie>
use strict;
use Getopt::Long;
# Tracepoint events
use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN => 1;
use constant MM_VMSCAN_DIRECT_RECLAIM_END => 2;
use constant MM_VMSCAN_KSWAPD_WAKE => 3;
use constant MM_VMSCAN_KSWAPD_SLEEP => 4;
use constant MM_VMSCAN_LRU_SHRINK_ACTIVE => 5;
use constant MM_VMSCAN_LRU_SHRINK_INACTIVE => 6;
use constant MM_VMSCAN_LRU_ISOLATE => 7;
use constant MM_VMSCAN_WRITEPAGE_FILE_SYNC => 8;
use constant MM_VMSCAN_WRITEPAGE_ANON_SYNC => 9;
use constant MM_VMSCAN_WRITEPAGE_FILE_ASYNC => 10;
use constant MM_VMSCAN_WRITEPAGE_ANON_ASYNC => 11;
use constant MM_VMSCAN_WRITEPAGE_ASYNC => 12;
use constant EVENT_UNKNOWN => 13;
# Per-order events
use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER => 11;
use constant MM_VMSCAN_WAKEUP_KSWAPD_PERORDER => 12;
use constant MM_VMSCAN_KSWAPD_WAKE_PERORDER => 13;
use constant HIGH_KSWAPD_REWAKEUP_PERORDER => 14;
# Constants used to track state
use constant STATE_DIRECT_BEGIN => 15;
use constant STATE_DIRECT_ORDER => 16;
use constant STATE_KSWAPD_BEGIN => 17;
use constant STATE_KSWAPD_ORDER => 18;
# High-level events extrapolated from tracepoints
use constant HIGH_DIRECT_RECLAIM_LATENCY => 19;
use constant HIGH_KSWAPD_LATENCY => 20;
use constant HIGH_KSWAPD_REWAKEUP => 21;
use constant HIGH_NR_SCANNED => 22;
use constant HIGH_NR_TAKEN => 23;
use constant HIGH_NR_RECLAIMED => 24;
use constant HIGH_NR_CONTIG_DIRTY => 25;
my %perprocesspid;
my %perprocess;
my %last_procmap;
my $opt_ignorepid;
my $opt_read_procstat;
my $total_wakeup_kswapd;
my ($total_direct_reclaim, $total_direct_nr_scanned);
my ($total_direct_latency, $total_kswapd_latency);
my ($total_direct_nr_reclaimed);
my ($total_direct_writepage_file_sync, $total_direct_writepage_file_async);
my ($total_direct_writepage_anon_sync, $total_direct_writepage_anon_async);
my ($total_kswapd_nr_scanned, $total_kswapd_wake);
my ($total_kswapd_writepage_file_sync, $total_kswapd_writepage_file_async);
my ($total_kswapd_writepage_anon_sync, $total_kswapd_writepage_anon_async);
my ($total_kswapd_nr_reclaimed);
# Catch sigint and exit on request
my $sigint_report = 0;
my $sigint_exit = 0;
my $sigint_pending = 0;
my $sigint_received = 0;
sub sigint_handler {
my $current_time = time;
if ($current_time - 2 > $sigint_received) {
print "SIGINT received, report pending. Hit ctrl-c again to exit\n";
$sigint_report = 1;
} else {
if (!$sigint_exit) {
print "Second SIGINT received quickly, exiting\n";
}
$sigint_exit++;
}
if ($sigint_exit > 3) {
print "Many SIGINTs received, exiting now without report\n";
exit;
}
$sigint_received = $current_time;
$sigint_pending = 1;
}
$SIG{INT} = "sigint_handler";
# Parse command line options
GetOptions(
'ignore-pid' => \$opt_ignorepid,
'read-procstat' => \$opt_read_procstat,
);
# Defaults for dynamically discovered regex's
my $regex_direct_begin_default = 'order=([0-9]*) may_writepage=([0-9]*) gfp_flags=([A-Z_|]*)';
my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)';
my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)';
my $regex_kswapd_sleep_default = 'nid=([0-9]*)';
my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*)';
my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_taken=([0-9]*) contig_taken=([0-9]*) contig_dirty=([0-9]*) contig_failed=([0-9]*)';
my $regex_lru_shrink_inactive_default = 'nid=([0-9]*) zid=([0-9]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)';
my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)';
my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)';
# Dyanically discovered regex
my $regex_direct_begin;
my $regex_direct_end;
my $regex_kswapd_wake;
my $regex_kswapd_sleep;
my $regex_wakeup_kswapd;
my $regex_lru_isolate;
my $regex_lru_shrink_inactive;
my $regex_lru_shrink_active;
my $regex_writepage;
# Static regex used. Specified like this for readability and for use with /o
# (process_pid) (cpus ) ( time ) (tpoint ) (details)
my $regex_traceevent = '\s*([a-zA-Z0-9-]*)\s*(\[[0-9]*\])\s*([0-9.]*):\s*([a-zA-Z_]*):\s*(.*)';
my $regex_statname = '[-0-9]*\s\((.*)\).*';
my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*';
sub generate_traceevent_regex {
my $event = shift;
my $default = shift;
my $regex;
# Read the event format or use the default
if (!open (FORMAT, "/sys/kernel/debug/tracing/events/$event/format")) {
print("WARNING: Event $event format string not found\n");
return $default;
} else {
my $line;
while (!eof(FORMAT)) {
$line = <FORMAT>;
$line =~ s/, REC->.*//;
if ($line =~ /^print fmt:\s"(.*)".*/) {
$regex = $1;
$regex =~ s/%s/\([0-9a-zA-Z|_]*\)/g;
$regex =~ s/%p/\([0-9a-f]*\)/g;
$regex =~ s/%d/\([-0-9]*\)/g;
$regex =~ s/%ld/\([-0-9]*\)/g;
$regex =~ s/%lu/\([0-9]*\)/g;
}
}
}
# Can't handle the print_flags stuff but in the context of this
# script, it really doesn't matter
$regex =~ s/\(REC.*\) \? __print_flags.*//;
# Verify fields are in the right order
my $tuple;
foreach $tuple (split /\s/, $regex) {
my ($key, $value) = split(/=/, $tuple);
my $expected = shift;
if ($key ne $expected) {
print("WARNING: Format not as expected for event $event '$key' != '$expected'\n");
$regex =~ s/$key=\((.*)\)/$key=$1/;
}
}
if (defined shift) {
die("Fewer fields than expected in format");
}
return $regex;
}
$regex_direct_begin = generate_traceevent_regex(
"vmscan/mm_vmscan_direct_reclaim_begin",
$regex_direct_begin_default,
"order", "may_writepage",
"gfp_flags");
$regex_direct_end = generate_traceevent_regex(
"vmscan/mm_vmscan_direct_reclaim_end",
$regex_direct_end_default,
"nr_reclaimed");
$regex_kswapd_wake = generate_traceevent_regex(
"vmscan/mm_vmscan_kswapd_wake",
$regex_kswapd_wake_default,
"nid", "order");
$regex_kswapd_sleep = generate_traceevent_regex(
"vmscan/mm_vmscan_kswapd_sleep",
$regex_kswapd_sleep_default,
"nid");
$regex_wakeup_kswapd = generate_traceevent_regex(
"vmscan/mm_vmscan_wakeup_kswapd",
$regex_wakeup_kswapd_default,
"nid", "zid", "order");
$regex_lru_isolate = generate_traceevent_regex(
"vmscan/mm_vmscan_lru_isolate",
$regex_lru_isolate_default,
"isolate_mode", "order",
"nr_requested", "nr_scanned", "nr_taken",
"contig_taken", "contig_dirty", "contig_failed");
$regex_lru_shrink_inactive = generate_traceevent_regex(
"vmscan/mm_vmscan_lru_shrink_inactive",
$regex_lru_shrink_inactive_default,
"nid", "zid",
"nr_scanned", "nr_reclaimed", "priority",
"flags");
$regex_lru_shrink_active = generate_traceevent_regex(
"vmscan/mm_vmscan_lru_shrink_active",
$regex_lru_shrink_active_default,
"nid", "zid",
"lru",
"nr_scanned", "nr_rotated", "priority");
$regex_writepage = generate_traceevent_regex(
"vmscan/mm_vmscan_writepage",
$regex_writepage_default,
"page", "pfn", "flags");
sub read_statline($) {
my $pid = $_[0];
my $statline;
if (open(STAT, "/proc/$pid/stat")) {
$statline = <STAT>;
close(STAT);
}
if ($statline eq '') {
$statline = "-1 (UNKNOWN_PROCESS_NAME) R 0";
}
return $statline;
}
sub guess_process_pid($$) {
my $pid = $_[0];
my $statline = $_[1];
if ($pid == 0) {
return "swapper-0";
}
if ($statline !~ /$regex_statname/o) {
die("Failed to math stat line for process name :: $statline");
}
return "$1-$pid";
}
# Convert sec.usec timestamp format
sub timestamp_to_ms($) {
my $timestamp = $_[0];
my ($sec, $usec) = split (/\./, $timestamp);
return ($sec * 1000) + ($usec / 1000);
}
sub process_events {
my $traceevent;
my $process_pid;
my $cpus;
my $timestamp;
my $tracepoint;
my $details;
my $statline;
# Read each line of the event log
EVENT_PROCESS:
while ($traceevent = <STDIN>) {
if ($traceevent =~ /$regex_traceevent/o) {
$process_pid = $1;
$timestamp = $3;
$tracepoint = $4;
$process_pid =~ /(.*)-([0-9]*)$/;
my $process = $1;
my $pid = $2;
if ($process eq "") {
$process = $last_procmap{$pid};
$process_pid = "$process-$pid";
}
$last_procmap{$pid} = $process;
if ($opt_read_procstat) {
$statline = read_statline($pid);
if ($opt_read_procstat && $process eq '') {
$process_pid = guess_process_pid($pid, $statline);
}
}
} else {
next;
}
# Perl Switch() sucks majorly
if ($tracepoint eq "mm_vmscan_direct_reclaim_begin") {
$timestamp = timestamp_to_ms($timestamp);
$perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}++;
$perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN} = $timestamp;
$details = $5;
if ($details !~ /$regex_direct_begin/o) {
print "WARNING: Failed to parse mm_vmscan_direct_reclaim_begin as expected\n";
print " $details\n";
print " $regex_direct_begin\n";
next;
}
my $order = $1;
$perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order]++;
$perprocesspid{$process_pid}->{STATE_DIRECT_ORDER} = $order;
} elsif ($tracepoint eq "mm_vmscan_direct_reclaim_end") {
# Count the event itself
my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END};
$perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END}++;
# Record how long direct reclaim took this time
if (defined $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN}) {
$timestamp = timestamp_to_ms($timestamp);
my $order = $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER};
my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN});
$perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] = "$order-$latency";
}
} elsif ($tracepoint eq "mm_vmscan_kswapd_wake") {
$details = $5;
if ($details !~ /$regex_kswapd_wake/o) {
print "WARNING: Failed to parse mm_vmscan_kswapd_wake as expected\n";
print " $details\n";
print " $regex_kswapd_wake\n";
next;
}
my $order = $2;
$perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER} = $order;
if (!$perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN}) {
$timestamp = timestamp_to_ms($timestamp);
$perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}++;
$perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = $timestamp;
$perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order]++;
} else {
$perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP}++;
$perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order]++;
}
} elsif ($tracepoint eq "mm_vmscan_kswapd_sleep") {
# Count the event itself
my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP};
$perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP}++;
# Record how long kswapd was awake
$timestamp = timestamp_to_ms($timestamp);
my $order = $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER};
my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN});
$perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index] = "$order-$latency";
$perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = 0;
} elsif ($tracepoint eq "mm_vmscan_wakeup_kswapd") {
$perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}++;
$details = $5;
if ($details !~ /$regex_wakeup_kswapd/o) {
print "WARNING: Failed to parse mm_vmscan_wakeup_kswapd as expected\n";
print " $details\n";
print " $regex_wakeup_kswapd\n";
next;
}
my $order = $3;
$perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order]++;
} elsif ($tracepoint eq "mm_vmscan_lru_isolate") {
$details = $5;
if ($details !~ /$regex_lru_isolate/o) {
print "WARNING: Failed to parse mm_vmscan_lru_isolate as expected\n";
print " $details\n";
print " $regex_lru_isolate/o\n";
next;
}
my $isolate_mode = $1;
my $nr_scanned = $4;
my $nr_contig_dirty = $7;
# To closer match vmstat scanning statistics, only count isolate_both
# and isolate_inactive as scanning. isolate_active is rotation
# isolate_inactive == 0
# isolate_active == 1
# isolate_both == 2
if ($isolate_mode != 1) {
$perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned;
}
$perprocesspid{$process_pid}->{HIGH_NR_CONTIG_DIRTY} += $nr_contig_dirty;
} elsif ($tracepoint eq "mm_vmscan_lru_shrink_inactive") {
$details = $5;
if ($details !~ /$regex_lru_shrink_inactive/o) {
print "WARNING: Failed to parse mm_vmscan_lru_shrink_inactive as expected\n";
print " $details\n";
print " $regex_lru_shrink_inactive/o\n";
next;
}
my $nr_reclaimed = $4;
$perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED} += $nr_reclaimed;
} elsif ($tracepoint eq "mm_vmscan_writepage") {
$details = $5;
if ($details !~ /$regex_writepage/o) {
print "WARNING: Failed to parse mm_vmscan_writepage as expected\n";
print " $details\n";
print " $regex_writepage\n";
next;
}
my $flags = $3;
my $file = 0;
my $sync_io = 0;
if ($flags =~ /RECLAIM_WB_FILE/) {
$file = 1;
}
if ($flags =~ /RECLAIM_WB_SYNC/) {
$sync_io = 1;
}
if ($sync_io) {
if ($file) {
$perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}++;
} else {
$perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}++;
}
} else {
if ($file) {
$perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}++;
} else {
$perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}++;
}
}
} else {
$perprocesspid{$process_pid}->{EVENT_UNKNOWN}++;
}
if ($sigint_pending) {
last EVENT_PROCESS;
}
}
}
sub dump_stats {
my $hashref = shift;
my %stats = %$hashref;
# Dump per-process stats
my $process_pid;
my $max_strlen = 0;
# Get the maximum process name
foreach $process_pid (keys %perprocesspid) {
my $len = length($process_pid);
if ($len > $max_strlen) {
$max_strlen = $len;
}
}
$max_strlen += 2;
# Work out latencies
printf("\n") if !$opt_ignorepid;
printf("Reclaim latencies expressed as order-latency_in_ms\n") if !$opt_ignorepid;
foreach $process_pid (keys %stats) {
if (!$stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[0] &&
!$stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[0]) {
next;
}
printf "%-" . $max_strlen . "s ", $process_pid if !$opt_ignorepid;
my $index = 0;
while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] ||
defined $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) {
if ($stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
printf("%s ", $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) if !$opt_ignorepid;
my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
$total_direct_latency += $latency;
} else {
printf("%s ", $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) if !$opt_ignorepid;
my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]);
$total_kswapd_latency += $latency;
}
$index++;
}
print "\n" if !$opt_ignorepid;
}
# Print out process activity
printf("\n");
printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s\n", "Process", "Direct", "Wokeup", "Pages", "Pages", "Pages", "Pages", "Time");
printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s\n", "details", "Rclms", "Kswapd", "Scanned", "Rclmed", "Sync-IO", "ASync-IO", "Stalled");
foreach $process_pid (keys %stats) {
if (!$stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
next;
}
$total_direct_reclaim += $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
$total_wakeup_kswapd += $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
$total_direct_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
$total_direct_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
$total_direct_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
$total_direct_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
$total_direct_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
$total_direct_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
my $index = 0;
my $this_reclaim_delay = 0;
while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
$this_reclaim_delay += $latency;
$index++;
}
printf("%-" . $max_strlen . "s %8d %10d %8u %8u %8u %8u %8.3f",
$process_pid,
$stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN},
$stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD},
$stats{$process_pid}->{HIGH_NR_SCANNED},
$stats{$process_pid}->{HIGH_NR_RECLAIMED},
$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC},
$this_reclaim_delay / 1000);
if ($stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
print " ";
for (my $order = 0; $order < 20; $order++) {
my $count = $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
if ($count != 0) {
print "direct-$order=$count ";
}
}
}
if ($stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}) {
print " ";
for (my $order = 0; $order < 20; $order++) {
my $count = $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
if ($count != 0) {
print "wakeup-$order=$count ";
}
}
}
if ($stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY}) {
print " ";
my $count = $stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY};
if ($count != 0) {
print "contig-dirty=$count ";
}
}
print "\n";
}
# Print out kswapd activity
printf("\n");
printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s\n", "Kswapd", "Kswapd", "Order", "Pages", "Pages", "Pages", "Pages");
printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s\n", "Instance", "Wakeups", "Re-wakeup", "Scanned", "Rclmed", "Sync-IO", "ASync-IO");
foreach $process_pid (keys %stats) {
if (!$stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
next;
}
$total_kswapd_wake += $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
$total_kswapd_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
$total_kswapd_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
$total_kswapd_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
$total_kswapd_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
$total_kswapd_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
$total_kswapd_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
printf("%-" . $max_strlen . "s %8d %10d %8u %8u %8i %8u",
$process_pid,
$stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE},
$stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP},
$stats{$process_pid}->{HIGH_NR_SCANNED},
$stats{$process_pid}->{HIGH_NR_RECLAIMED},
$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
$stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC});
if ($stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
print " ";
for (my $order = 0; $order < 20; $order++) {
my $count = $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
if ($count != 0) {
print "wake-$order=$count ";
}
}
}
if ($stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP}) {
print " ";
for (my $order = 0; $order < 20; $order++) {
my $count = $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order];
if ($count != 0) {
print "rewake-$order=$count ";
}
}
}
printf("\n");
}
# Print out summaries
$total_direct_latency /= 1000;
$total_kswapd_latency /= 1000;
print "\nSummary\n";
print "Direct reclaims: $total_direct_reclaim\n";
print "Direct reclaim pages scanned: $total_direct_nr_scanned\n";
print "Direct reclaim pages reclaimed: $total_direct_nr_reclaimed\n";
print "Direct reclaim write file sync I/O: $total_direct_writepage_file_sync\n";
print "Direct reclaim write anon sync I/O: $total_direct_writepage_anon_sync\n";
print "Direct reclaim write file async I/O: $total_direct_writepage_file_async\n";
print "Direct reclaim write anon async I/O: $total_direct_writepage_anon_async\n";
print "Wake kswapd requests: $total_wakeup_kswapd\n";
printf "Time stalled direct reclaim: %-1.2f seconds\n", $total_direct_latency;
print "\n";
print "Kswapd wakeups: $total_kswapd_wake\n";
print "Kswapd pages scanned: $total_kswapd_nr_scanned\n";
print "Kswapd pages reclaimed: $total_kswapd_nr_reclaimed\n";
print "Kswapd reclaim write file sync I/O: $total_kswapd_writepage_file_sync\n";
print "Kswapd reclaim write anon sync I/O: $total_kswapd_writepage_anon_sync\n";
print "Kswapd reclaim write file async I/O: $total_kswapd_writepage_file_async\n";
print "Kswapd reclaim write anon async I/O: $total_kswapd_writepage_anon_async\n";
printf "Time kswapd awake: %-1.2f seconds\n", $total_kswapd_latency;
}
sub aggregate_perprocesspid() {
my $process_pid;
my $process;
undef %perprocess;
foreach $process_pid (keys %perprocesspid) {
$process = $process_pid;
$process =~ s/-([0-9])*$//;
if ($process eq '') {
$process = "NO_PROCESS_NAME";
}
$perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN} += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
$perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE} += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
$perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD} += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
$perprocess{$process}->{HIGH_KSWAPD_REWAKEUP} += $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP};
$perprocess{$process}->{HIGH_NR_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_SCANNED};
$perprocess{$process}->{HIGH_NR_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED};
$perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
$perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
$perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
$perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
for (my $order = 0; $order < 20; $order++) {
$perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
$perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
$perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
}
# Aggregate direct reclaim latencies
my $wr_index = $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END};
my $rd_index = 0;
while (defined $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index]) {
$perprocess{$process}->{HIGH_DIRECT_RECLAIM_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index];
$rd_index++;
$wr_index++;
}
$perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
# Aggregate kswapd latencies
my $wr_index = $perprocess{$process}->{MM_VMSCAN_KSWAPD_SLEEP};
my $rd_index = 0;
while (defined $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index]) {
$perprocess{$process}->{HIGH_KSWAPD_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index];
$rd_index++;
$wr_index++;
}
$perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
}
}
sub report() {
if (!$opt_ignorepid) {
dump_stats(\%perprocesspid);
} else {
aggregate_perprocesspid();
dump_stats(\%perprocess);
}
}
# Process events or signals until neither is available
sub signal_loop() {
my $sigint_processed;
do {
$sigint_processed = 0;
process_events();
# Handle pending signals if any
if ($sigint_pending) {
my $current_time = time;
if ($sigint_exit) {
print "Received exit signal\n";
$sigint_pending = 0;
}
if ($sigint_report) {
if ($current_time >= $sigint_received + 2) {
report();
$sigint_report = 0;
$sigint_pending = 0;
$sigint_processed = 1;
}
}
}
} while ($sigint_pending || $sigint_processed);
}
signal_loop();
report();
