Documentation/trace/postprocess/trace-vmscan-postprocess.pl

   1 #!/usr/bin/perl
   2 # This is a POC for reading the text representation of trace output related to
   3 # page reclaim. It makes an attempt to extract some high-level information on
   4 # what is going on. The accuracy of the parser may vary
   5 #
   6 # Example usage: trace-vmscan-postprocess.pl < /sys/kernel/debug/tracing/trace_pipe
   7 # other options
   8 #   --read-procstat     If the trace lacks process info, get it from /proc
   9 #   --ignore-pid        Aggregate processes of the same name together
  10 #
  11 # Copyright (c) IBM Corporation 2009
  12 # Author: Mel Gorman <mel@csn.ul.ie>
  13 use strict;
  14 use Getopt::Long;
  15
  16 # Tracepoint events
  17 use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN     => 1;
  18 use constant MM_VMSCAN_DIRECT_RECLAIM_END       => 2;
  19 use constant MM_VMSCAN_KSWAPD_WAKE              => 3;
  20 use constant MM_VMSCAN_KSWAPD_SLEEP             => 4;
  21 use constant MM_VMSCAN_LRU_SHRINK_ACTIVE        => 5;
  22 use constant MM_VMSCAN_LRU_SHRINK_INACTIVE      => 6;
  23 use constant MM_VMSCAN_LRU_ISOLATE              => 7;
  24 use constant MM_VMSCAN_WRITEPAGE_FILE_SYNC      => 8;
  25 use constant MM_VMSCAN_WRITEPAGE_ANON_SYNC      => 9;
  26 use constant MM_VMSCAN_WRITEPAGE_FILE_ASYNC     => 10;
  27 use constant MM_VMSCAN_WRITEPAGE_ANON_ASYNC     => 11;
  28 use constant MM_VMSCAN_WRITEPAGE_ASYNC          => 12;
  29 use constant EVENT_UNKNOWN                      => 13;
  30
  31 # Per-order events
  32 use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER => 11;
  33 use constant MM_VMSCAN_WAKEUP_KSWAPD_PERORDER   => 12;
  34 use constant MM_VMSCAN_KSWAPD_WAKE_PERORDER     => 13;
  35 use constant HIGH_KSWAPD_REWAKEUP_PERORDER      => 14;
  36
  37 # Constants used to track state
  38 use constant STATE_DIRECT_BEGIN                 => 15;
  39 use constant STATE_DIRECT_ORDER                 => 16;
  40 use constant STATE_KSWAPD_BEGIN                 => 17;
  41 use constant STATE_KSWAPD_ORDER                 => 18;
  42
  43 # High-level events extrapolated from tracepoints
  44 use constant HIGH_DIRECT_RECLAIM_LATENCY        => 19;
  45 use constant HIGH_KSWAPD_LATENCY                => 20;
  46 use constant HIGH_KSWAPD_REWAKEUP               => 21;
  47 use constant HIGH_NR_SCANNED                    => 22;
  48 use constant HIGH_NR_TAKEN                      => 23;
  49 use constant HIGH_NR_RECLAIMED                  => 24;
  50 use constant HIGH_NR_FILE_SCANNED               => 25;
  51 use constant HIGH_NR_ANON_SCANNED               => 26;
  52 use constant HIGH_NR_FILE_RECLAIMED             => 27;
  53 use constant HIGH_NR_ANON_RECLAIMED             => 28;
  54
  55 my %perprocesspid;
  56 my %perprocess;
  57 my %last_procmap;
  58 my $opt_ignorepid;
  59 my $opt_read_procstat;
  60
  61 my $total_wakeup_kswapd;
  62 my ($total_direct_reclaim, $total_direct_nr_scanned);
  63 my ($total_direct_nr_file_scanned, $total_direct_nr_anon_scanned);
  64 my ($total_direct_latency, $total_kswapd_latency);
  65 my ($total_direct_nr_reclaimed);
  66 my ($total_direct_nr_file_reclaimed, $total_direct_nr_anon_reclaimed);
  67 my ($total_direct_writepage_file_sync, $total_direct_writepage_file_async);
  68 my ($total_direct_writepage_anon_sync, $total_direct_writepage_anon_async);
  69 my ($total_kswapd_nr_scanned, $total_kswapd_wake);
  70 my ($total_kswapd_nr_file_scanned, $total_kswapd_nr_anon_scanned);
  71 my ($total_kswapd_writepage_file_sync, $total_kswapd_writepage_file_async);
  72 my ($total_kswapd_writepage_anon_sync, $total_kswapd_writepage_anon_async);
  73 my ($total_kswapd_nr_reclaimed);
  74 my ($total_kswapd_nr_file_reclaimed, $total_kswapd_nr_anon_reclaimed);
  75
  76 # Catch sigint and exit on request
  77 my $sigint_report = 0;
  78 my $sigint_exit = 0;
  79 my $sigint_pending = 0;
  80 my $sigint_received = 0;
  81 sub sigint_handler {
  82         my $current_time = time;
  83         if ($current_time - 2 > $sigint_received) {
  84                 print "SIGINT received, report pending. Hit ctrl-c again to exit\n";
  85                 $sigint_report = 1;
  86         } else {
  87                 if (!$sigint_exit) {
  88                         print "Second SIGINT received quickly, exiting\n";
  89                 }
  90                 $sigint_exit++;
  91         }
  92
  93         if ($sigint_exit > 3) {
  94                 print "Many SIGINTs received, exiting now without report\n";
  95                 exit;
  96         }
  97
  98         $sigint_received = $current_time;
  99         $sigint_pending = 1;
 100 }
 101 $SIG{INT} = "sigint_handler";
 102
 103 # Parse command line options
 104 GetOptions(
 105         'ignore-pid'     =>     \$opt_ignorepid,
 106         'read-procstat'  =>     \$opt_read_procstat,
 107 );
 108
 109 # Defaults for dynamically discovered regex's
 110 my $regex_direct_begin_default = 'order=([0-9]*) may_writepage=([0-9]*) gfp_flags=([A-Z_|]*)';
 111 my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)';
 112 my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)';
 113 my $regex_kswapd_sleep_default = 'nid=([0-9]*)';
 114 my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*)';
 115 my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_taken=([0-9]*) file=([0-9]*)';
 116 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_|]*)';
 117 my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)';
 118 my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)';
 119
 120 # Dyanically discovered regex
 121 my $regex_direct_begin;
 122 my $regex_direct_end;
 123 my $regex_kswapd_wake;
 124 my $regex_kswapd_sleep;
 125 my $regex_wakeup_kswapd;
 126 my $regex_lru_isolate;
 127 my $regex_lru_shrink_inactive;
 128 my $regex_lru_shrink_active;
 129 my $regex_writepage;
 130
 131 # Static regex used. Specified like this for readability and for use with /o
 132 #                      (process_pid)     (cpus      )   ( time  )   (tpoint    ) (details)
 133 my $regex_traceevent = '\s*([a-zA-Z0-9-]*)\s*(\[[0-9]*\])(\s*[dX.][Nnp.][Hhs.][0-9a-fA-F.]*|)\s*([0-9.]*):\s*([a-zA-Z_]*):\s*(.*)';
 134 my $regex_statname = '[-0-9]*\s\((.*)\).*';
 135 my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*';
 136
 137 sub generate_traceevent_regex {
 138         my $event = shift;
 139         my $default = shift;
 140         my $regex;
 141
 142         # Read the event format or use the default
 143         if (!open (FORMAT, "/sys/kernel/debug/tracing/events/$event/format")) {
 144                 print("WARNING: Event $event format string not found\n");
 145                 return $default;
 146         } else {
 147                 my $line;
 148                 while (!eof(FORMAT)) {
 149                         $line = <FORMAT>;
 150                         $line =~ s/, REC->.*//;
 151                         if ($line =~ /^print fmt:\s"(.*)".*/) {
 152                                 $regex = $1;
 153                                 $regex =~ s/%s/\([0-9a-zA-Z|_]*\)/g;
 154                                 $regex =~ s/%p/\([0-9a-f]*\)/g;
 155                                 $regex =~ s/%d/\([-0-9]*\)/g;
 156                                 $regex =~ s/%ld/\([-0-9]*\)/g;
 157                                 $regex =~ s/%lu/\([0-9]*\)/g;
 158                         }
 159                 }
 160         }
 161
 162         # Can't handle the print_flags stuff but in the context of this
 163         # script, it really doesn't matter
 164         $regex =~ s/\(REC.*\) \? __print_flags.*//;
 165
 166         # Verify fields are in the right order
 167         my $tuple;
 168         foreach $tuple (split /\s/, $regex) {
 169                 my ($key, $value) = split(/=/, $tuple);
 170                 my $expected = shift;
 171                 if ($key ne $expected) {
 172                         print("WARNING: Format not as expected for event $event '$key' != '$expected'\n");
 173                         $regex =~ s/$key=\((.*)\)/$key=$1/;
 174                 }
 175         }
 176
 177         if (defined shift) {
 178                 die("Fewer fields than expected in format");
 179         }
 180
 181         return $regex;
 182 }
 183
 184 $regex_direct_begin = generate_traceevent_regex(
 185                         "vmscan/mm_vmscan_direct_reclaim_begin",
 186                         $regex_direct_begin_default,
 187                         "order", "may_writepage",
 188                         "gfp_flags");
 189 $regex_direct_end = generate_traceevent_regex(
 190                         "vmscan/mm_vmscan_direct_reclaim_end",
 191                         $regex_direct_end_default,
 192                         "nr_reclaimed");
 193 $regex_kswapd_wake = generate_traceevent_regex(
 194                         "vmscan/mm_vmscan_kswapd_wake",
 195                         $regex_kswapd_wake_default,
 196                         "nid", "order");
 197 $regex_kswapd_sleep = generate_traceevent_regex(
 198                         "vmscan/mm_vmscan_kswapd_sleep",
 199                         $regex_kswapd_sleep_default,
 200                         "nid");
 201 $regex_wakeup_kswapd = generate_traceevent_regex(
 202                         "vmscan/mm_vmscan_wakeup_kswapd",
 203                         $regex_wakeup_kswapd_default,
 204                         "nid", "zid", "order");
 205 $regex_lru_isolate = generate_traceevent_regex(
 206                         "vmscan/mm_vmscan_lru_isolate",
 207                         $regex_lru_isolate_default,
 208                         "isolate_mode", "order",
 209                         "nr_requested", "nr_scanned", "nr_taken",
 210                         "file");
 211 $regex_lru_shrink_inactive = generate_traceevent_regex(
 212                         "vmscan/mm_vmscan_lru_shrink_inactive",
 213                         $regex_lru_shrink_inactive_default,
 214                         "nid", "zid",
 215                         "nr_scanned", "nr_reclaimed", "priority",
 216                         "flags");
 217 $regex_lru_shrink_active = generate_traceevent_regex(
 218                         "vmscan/mm_vmscan_lru_shrink_active",
 219                         $regex_lru_shrink_active_default,
 220                         "nid", "zid",
 221                         "lru",
 222                         "nr_scanned", "nr_rotated", "priority");
 223 $regex_writepage = generate_traceevent_regex(
 224                         "vmscan/mm_vmscan_writepage",
 225                         $regex_writepage_default,
 226                         "page", "pfn", "flags");
 227
 228 sub read_statline($) {
 229         my $pid = $_[0];
 230         my $statline;
 231
 232         if (open(STAT, "/proc/$pid/stat")) {
 233                 $statline = <STAT>;
 234                 close(STAT);
 235         }
 236
 237         if ($statline eq '') {
 238                 $statline = "-1 (UNKNOWN_PROCESS_NAME) R 0";
 239         }
 240
 241         return $statline;
 242 }
 243
 244 sub guess_process_pid($$) {
 245         my $pid = $_[0];
 246         my $statline = $_[1];
 247
 248         if ($pid == 0) {
 249                 return "swapper-0";
 250         }
 251
 252         if ($statline !~ /$regex_statname/o) {
 253                 die("Failed to math stat line for process name :: $statline");
 254         }
 255         return "$1-$pid";
 256 }
 257
 258 # Convert sec.usec timestamp format
 259 sub timestamp_to_ms($) {
 260         my $timestamp = $_[0];
 261
 262         my ($sec, $usec) = split (/\./, $timestamp);
 263         return ($sec * 1000) + ($usec / 1000);
 264 }
 265
 266 sub process_events {
 267         my $traceevent;
 268         my $process_pid;
 269         my $cpus;
 270         my $timestamp;
 271         my $tracepoint;
 272         my $details;
 273         my $statline;
 274
 275         # Read each line of the event log
 276 EVENT_PROCESS:
 277         while ($traceevent = <STDIN>) {
 278                 if ($traceevent =~ /$regex_traceevent/o) {
 279                         $process_pid = $1;
 280                         $timestamp = $4;
 281                         $tracepoint = $5;
 282
 283                         $process_pid =~ /(.*)-([0-9]*)$/;
 284                         my $process = $1;
 285                         my $pid = $2;
 286
 287                         if ($process eq "") {
 288                                 $process = $last_procmap{$pid};
 289                                 $process_pid = "$process-$pid";
 290                         }
 291                         $last_procmap{$pid} = $process;
 292
 293                         if ($opt_read_procstat) {
 294                                 $statline = read_statline($pid);
 295                                 if ($opt_read_procstat && $process eq '') {
 296                                         $process_pid = guess_process_pid($pid, $statline);
 297                                 }
 298                         }
 299                 } else {
 300                         next;
 301                 }
 302
 303                 # Perl Switch() sucks majorly
 304                 if ($tracepoint eq "mm_vmscan_direct_reclaim_begin") {
 305                         $timestamp = timestamp_to_ms($timestamp);
 306                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}++;
 307                         $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN} = $timestamp;
 308
 309                         $details = $6;
 310                         if ($details !~ /$regex_direct_begin/o) {
 311                                 print "WARNING: Failed to parse mm_vmscan_direct_reclaim_begin as expected\n";
 312                                 print "         $details\n";
 313                                 print "         $regex_direct_begin\n";
 314                                 next;
 315                         }
 316                         my $order = $1;
 317                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order]++;
 318                         $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER} = $order;
 319                 } elsif ($tracepoint eq "mm_vmscan_direct_reclaim_end") {
 320                         # Count the event itself
 321                         my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END};
 322                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END}++;
 323
 324                         # Record how long direct reclaim took this time
 325                         if (defined $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN}) {
 326                                 $timestamp = timestamp_to_ms($timestamp);
 327                                 my $order = $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER};
 328                                 my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN});
 329                                 $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] = "$order-$latency";
 330                         }
 331                 } elsif ($tracepoint eq "mm_vmscan_kswapd_wake") {
 332                         $details = $6;
 333                         if ($details !~ /$regex_kswapd_wake/o) {
 334                                 print "WARNING: Failed to parse mm_vmscan_kswapd_wake as expected\n";
 335                                 print "         $details\n";
 336                                 print "         $regex_kswapd_wake\n";
 337                                 next;
 338                         }
 339
 340                         my $order = $2;
 341                         $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER} = $order;
 342                         if (!$perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN}) {
 343                                 $timestamp = timestamp_to_ms($timestamp);
 344                                 $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}++;
 345                                 $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = $timestamp;
 346                                 $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order]++;
 347                         } else {
 348                                 $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP}++;
 349                                 $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order]++;
 350                         }
 351                 } elsif ($tracepoint eq "mm_vmscan_kswapd_sleep") {
 352
 353                         # Count the event itself
 354                         my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP};
 355                         $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP}++;
 356
 357                         # Record how long kswapd was awake
 358                         $timestamp = timestamp_to_ms($timestamp);
 359                         my $order = $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER};
 360                         my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN});
 361                         $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index] = "$order-$latency";
 362                         $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = 0;
 363                 } elsif ($tracepoint eq "mm_vmscan_wakeup_kswapd") {
 364                         $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}++;
 365
 366                         $details = $6;
 367                         if ($details !~ /$regex_wakeup_kswapd/o) {
 368                                 print "WARNING: Failed to parse mm_vmscan_wakeup_kswapd as expected\n";
 369                                 print "         $details\n";
 370                                 print "         $regex_wakeup_kswapd\n";
 371                                 next;
 372                         }
 373                         my $order = $3;
 374                         $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order]++;
 375                 } elsif ($tracepoint eq "mm_vmscan_lru_isolate") {
 376                         $details = $6;
 377                         if ($details !~ /$regex_lru_isolate/o) {
 378                                 print "WARNING: Failed to parse mm_vmscan_lru_isolate as expected\n";
 379                                 print "         $details\n";
 380                                 print "         $regex_lru_isolate/o\n";
 381                                 next;
 382                         }
 383                         my $isolate_mode = $1;
 384                         my $nr_scanned = $4;
 385                         my $file = $6;
 386
 387                         # To closer match vmstat scanning statistics, only count isolate_both
 388                         # and isolate_inactive as scanning. isolate_active is rotation
 389                         # isolate_inactive == 1
 390                         # isolate_active   == 2
 391                         # isolate_both     == 3
 392                         if ($isolate_mode != 2) {
 393                                 $perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned;
 394                                 if ($file == 1) {
 395                                         $perprocesspid{$process_pid}->{HIGH_NR_FILE_SCANNED} += $nr_scanned;
 396                                 } else {
 397                                         $perprocesspid{$process_pid}->{HIGH_NR_ANON_SCANNED} += $nr_scanned;
 398                                 }
 399                         }
 400                 } elsif ($tracepoint eq "mm_vmscan_lru_shrink_inactive") {
 401                         $details = $6;
 402                         if ($details !~ /$regex_lru_shrink_inactive/o) {
 403                                 print "WARNING: Failed to parse mm_vmscan_lru_shrink_inactive as expected\n";
 404                                 print "         $details\n";
 405                                 print "         $regex_lru_shrink_inactive/o\n";
 406                                 next;
 407                         }
 408
 409                         my $nr_reclaimed = $4;
 410                         my $flags = $6;
 411                         my $file = 0;
 412                         if ($flags =~ /RECLAIM_WB_FILE/) {
 413                                 $file = 1;
 414                         }
 415                         $perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED} += $nr_reclaimed;
 416                         if ($file) {
 417                                 $perprocesspid{$process_pid}->{HIGH_NR_FILE_RECLAIMED} += $nr_reclaimed;
 418                         } else {
 419                                 $perprocesspid{$process_pid}->{HIGH_NR_ANON_RECLAIMED} += $nr_reclaimed;
 420                         }
 421                 } elsif ($tracepoint eq "mm_vmscan_writepage") {
 422                         $details = $6;
 423                         if ($details !~ /$regex_writepage/o) {
 424                                 print "WARNING: Failed to parse mm_vmscan_writepage as expected\n";
 425                                 print "         $details\n";
 426                                 print "         $regex_writepage\n";
 427                                 next;
 428                         }
 429
 430                         my $flags = $3;
 431                         my $file = 0;
 432                         my $sync_io = 0;
 433                         if ($flags =~ /RECLAIM_WB_FILE/) {
 434                                 $file = 1;
 435                         }
 436                         if ($flags =~ /RECLAIM_WB_SYNC/) {
 437                                 $sync_io = 1;
 438                         }
 439                         if ($sync_io) {
 440                                 if ($file) {
 441                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}++;
 442                                 } else {
 443                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}++;
 444                                 }
 445                         } else {
 446                                 if ($file) {
 447                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}++;
 448                                 } else {
 449                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}++;
 450                                 }
 451                         }
 452                 } else {
 453                         $perprocesspid{$process_pid}->{EVENT_UNKNOWN}++;
 454                 }
 455
 456                 if ($sigint_pending) {
 457                         last EVENT_PROCESS;
 458                 }
 459         }
 460 }
 461
 462 sub dump_stats {
 463         my $hashref = shift;
 464         my %stats = %$hashref;
 465
 466         # Dump per-process stats
 467         my $process_pid;
 468         my $max_strlen = 0;
 469
 470         # Get the maximum process name
 471         foreach $process_pid (keys %perprocesspid) {
 472                 my $len = length($process_pid);
 473                 if ($len > $max_strlen) {
 474                         $max_strlen = $len;
 475                 }
 476         }
 477         $max_strlen += 2;
 478
 479         # Work out latencies
 480         printf("\n") if !$opt_ignorepid;
 481         printf("Reclaim latencies expressed as order-latency_in_ms\n") if !$opt_ignorepid;
 482         foreach $process_pid (keys %stats) {
 483
 484                 if (!$stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[0] &&
 485                                 !$stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[0]) {
 486                         next;
 487                 }
 488
 489                 printf "%-" . $max_strlen . "s ", $process_pid if !$opt_ignorepid;
 490                 my $index = 0;
 491                 while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] ||
 492                         defined $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) {
 493
 494                         if ($stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
 495                                 printf("%s ", $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) if !$opt_ignorepid;
 496                                 my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
 497                                 $total_direct_latency += $latency;
 498                         } else {
 499                                 printf("%s ", $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) if !$opt_ignorepid;
 500                                 my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]);
 501                                 $total_kswapd_latency += $latency;
 502                         }
 503                         $index++;
 504                 }
 505                 print "\n" if !$opt_ignorepid;
 506         }
 507
 508         # Print out process activity
 509         printf("\n");
 510         printf("%-" . $max_strlen . "s %8s %10s   %8s %8s  %8s %8s %8s %8s\n", "Process", "Direct",  "Wokeup", "Pages",   "Pages",   "Pages",   "Pages",     "Time");
 511         printf("%-" . $max_strlen . "s %8s %10s   %8s %8s  %8s %8s %8s %8s\n", "details", "Rclms",   "Kswapd", "Scanned", "Rclmed",  "Sync-IO", "ASync-IO",  "Stalled");
 512         foreach $process_pid (keys %stats) {
 513
 514                 if (!$stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
 515                         next;
 516                 }
 517
 518                 $total_direct_reclaim += $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
 519                 $total_wakeup_kswapd += $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 520                 $total_direct_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
 521                 $total_direct_nr_file_scanned += $stats{$process_pid}->{HIGH_NR_FILE_SCANNED};
 522                 $total_direct_nr_anon_scanned += $stats{$process_pid}->{HIGH_NR_ANON_SCANNED};
 523                 $total_direct_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
 524                 $total_direct_nr_file_reclaimed += $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
 525                 $total_direct_nr_anon_reclaimed += $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 526                 $total_direct_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 527                 $total_direct_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 528                 $total_direct_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 529
 530                 $total_direct_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 531
 532                 my $index = 0;
 533                 my $this_reclaim_delay = 0;
 534                 while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
 535                          my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
 536                         $this_reclaim_delay += $latency;
 537                         $index++;
 538                 }
 539
 540                 printf("%-" . $max_strlen . "s %8d %10d   %8u %8u  %8u %8u %8.3f",
 541                         $process_pid,
 542                         $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN},
 543                         $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD},
 544                         $stats{$process_pid}->{HIGH_NR_SCANNED},
 545                         $stats{$process_pid}->{HIGH_NR_FILE_SCANNED},
 546                         $stats{$process_pid}->{HIGH_NR_ANON_SCANNED},
 547                         $stats{$process_pid}->{HIGH_NR_RECLAIMED},
 548                         $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED},
 549                         $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED},
 550                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 551                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC},
 552                         $this_reclaim_delay / 1000);
 553
 554                 if ($stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
 555                         print "      ";
 556                         for (my $order = 0; $order < 20; $order++) {
 557                                 my $count = $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
 558                                 if ($count != 0) {
 559                                         print "direct-$order=$count ";
 560                                 }
 561                         }
 562                 }
 563                 if ($stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}) {
 564                         print "      ";
 565                         for (my $order = 0; $order < 20; $order++) {
 566                                 my $count = $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
 567                                 if ($count != 0) {
 568                                         print "wakeup-$order=$count ";
 569                                 }
 570                         }
 571                 }
 572
 573                 print "\n";
 574         }
 575
 576         # Print out kswapd activity
 577         printf("\n");
 578         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s\n", "Kswapd",   "Kswapd",  "Order",     "Pages",   "Pages",   "Pages",  "Pages");
 579         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s\n", "Instance", "Wakeups", "Re-wakeup", "Scanned", "Rclmed",  "Sync-IO", "ASync-IO");
 580         foreach $process_pid (keys %stats) {
 581
 582                 if (!$stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
 583                         next;
 584                 }
 585
 586                 $total_kswapd_wake += $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
 587                 $total_kswapd_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
 588                 $total_kswapd_nr_file_scanned += $stats{$process_pid}->{HIGH_NR_FILE_SCANNED};
 589                 $total_kswapd_nr_anon_scanned += $stats{$process_pid}->{HIGH_NR_ANON_SCANNED};
 590                 $total_kswapd_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
 591                 $total_kswapd_nr_file_reclaimed += $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
 592                 $total_kswapd_nr_anon_reclaimed += $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 593                 $total_kswapd_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 594                 $total_kswapd_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 595                 $total_kswapd_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 596                 $total_kswapd_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 597
 598                 printf("%-" . $max_strlen . "s %8d %10d   %8u %8u  %8i %8u",
 599                         $process_pid,
 600                         $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE},
 601                         $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP},
 602                         $stats{$process_pid}->{HIGH_NR_SCANNED},
 603                         $stats{$process_pid}->{HIGH_NR_FILE_SCANNED},
 604                         $stats{$process_pid}->{HIGH_NR_ANON_SCANNED},
 605                         $stats{$process_pid}->{HIGH_NR_RECLAIMED},
 606                         $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED},
 607                         $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED},
 608                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 609                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC});
 610
 611                 if ($stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
 612                         print "      ";
 613                         for (my $order = 0; $order < 20; $order++) {
 614                                 my $count = $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
 615                                 if ($count != 0) {
 616                                         print "wake-$order=$count ";
 617                                 }
 618                         }
 619                 }
 620                 if ($stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP}) {
 621                         print "      ";
 622                         for (my $order = 0; $order < 20; $order++) {
 623                                 my $count = $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order];
 624                                 if ($count != 0) {
 625                                         print "rewake-$order=$count ";
 626                                 }
 627                         }
 628                 }
 629                 printf("\n");
 630         }
 631
 632         # Print out summaries
 633         $total_direct_latency /= 1000;
 634         $total_kswapd_latency /= 1000;
 635         print "\nSummary\n";
 636         print "Direct reclaims:                         $total_direct_reclaim\n";
 637         print "Direct reclaim pages scanned:            $total_direct_nr_scanned\n";
 638         print "Direct reclaim file pages scanned:       $total_direct_nr_file_scanned\n";
 639         print "Direct reclaim anon pages scanned:       $total_direct_nr_anon_scanned\n";
 640         print "Direct reclaim pages reclaimed:          $total_direct_nr_reclaimed\n";
 641         print "Direct reclaim file pages reclaimed:     $total_direct_nr_file_reclaimed\n";
 642         print "Direct reclaim anon pages reclaimed:     $total_direct_nr_anon_reclaimed\n";
 643         print "Direct reclaim write file sync I/O:      $total_direct_writepage_file_sync\n";
 644         print "Direct reclaim write anon sync I/O:      $total_direct_writepage_anon_sync\n";
 645         print "Direct reclaim write file async I/O:     $total_direct_writepage_file_async\n";
 646         print "Direct reclaim write anon async I/O:     $total_direct_writepage_anon_async\n";
 647         print "Wake kswapd requests:                    $total_wakeup_kswapd\n";
 648         printf "Time stalled direct reclaim:            %-1.2f seconds\n", $total_direct_latency;
 649         print "\n";
 650         print "Kswapd wakeups:                          $total_kswapd_wake\n";
 651         print "Kswapd pages scanned:                    $total_kswapd_nr_scanned\n";
 652         print "Kswapd file pages scanned:               $total_kswapd_nr_file_scanned\n";
 653         print "Kswapd anon pages scanned:               $total_kswapd_nr_anon_scanned\n";
 654         print "Kswapd pages reclaimed:                  $total_kswapd_nr_reclaimed\n";
 655         print "Kswapd file pages reclaimed:             $total_kswapd_nr_file_reclaimed\n";
 656         print "Kswapd anon pages reclaimed:             $total_kswapd_nr_anon_reclaimed\n";
 657         print "Kswapd reclaim write file sync I/O:      $total_kswapd_writepage_file_sync\n";
 658         print "Kswapd reclaim write anon sync I/O:      $total_kswapd_writepage_anon_sync\n";
 659         print "Kswapd reclaim write file async I/O:     $total_kswapd_writepage_file_async\n";
 660         print "Kswapd reclaim write anon async I/O:     $total_kswapd_writepage_anon_async\n";
 661         printf "Time kswapd awake:                      %-1.2f seconds\n", $total_kswapd_latency;
 662 }
 663
 664 sub aggregate_perprocesspid() {
 665         my $process_pid;
 666         my $process;
 667         undef %perprocess;
 668
 669         foreach $process_pid (keys %perprocesspid) {
 670                 $process = $process_pid;
 671                 $process =~ s/-([0-9])*$//;
 672                 if ($process eq '') {
 673                         $process = "NO_PROCESS_NAME";
 674                 }
 675
 676                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN} += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
 677                 $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE} += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
 678                 $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD} += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 679                 $perprocess{$process}->{HIGH_KSWAPD_REWAKEUP} += $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP};
 680                 $perprocess{$process}->{HIGH_NR_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_SCANNED};
 681                 $perprocess{$process}->{HIGH_NR_FILE_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_FILE_SCANNED};
 682                 $perprocess{$process}->{HIGH_NR_ANON_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_ANON_SCANNED};
 683                 $perprocess{$process}->{HIGH_NR_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED};
 684                 $perprocess{$process}->{HIGH_NR_FILE_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
 685                 $perprocess{$process}->{HIGH_NR_ANON_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 686                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 687                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 688                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 689                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 690
 691                 for (my $order = 0; $order < 20; $order++) {
 692                         $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
 693                         $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
 694                         $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
 695
 696                 }
 697
 698                 # Aggregate direct reclaim latencies
 699                 my $wr_index = $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END};
 700                 my $rd_index = 0;
 701                 while (defined $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index]) {
 702                         $perprocess{$process}->{HIGH_DIRECT_RECLAIM_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index];
 703                         $rd_index++;
 704                         $wr_index++;
 705                 }
 706                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
 707
 708                 # Aggregate kswapd latencies
 709                 my $wr_index = $perprocess{$process}->{MM_VMSCAN_KSWAPD_SLEEP};
 710                 my $rd_index = 0;
 711                 while (defined $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index]) {
 712                         $perprocess{$process}->{HIGH_KSWAPD_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index];
 713                         $rd_index++;
 714                         $wr_index++;
 715                 }
 716                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
 717         }
 718 }
 719
 720 sub report() {
 721         if (!$opt_ignorepid) {
 722                 dump_stats(\%perprocesspid);
 723         } else {
 724                 aggregate_perprocesspid();
 725                 dump_stats(\%perprocess);
 726         }
 727 }
 728
 729 # Process events or signals until neither is available
 730 sub signal_loop() {
 731         my $sigint_processed;
 732         do {
 733                 $sigint_processed = 0;
 734                 process_events();
 735
 736                 # Handle pending signals if any
 737                 if ($sigint_pending) {
 738                         my $current_time = time;
 739
 740                         if ($sigint_exit) {
 741                                 print "Received exit signal\n";
 742                                 $sigint_pending = 0;
 743                         }
 744                         if ($sigint_report) {
 745                                 if ($current_time >= $sigint_received + 2) {
 746                                         report();
 747                                         $sigint_report = 0;
 748                                         $sigint_pending = 0;
 749                                         $sigint_processed = 1;
 750                                 }
 751                         }
 752                 }
 753         } while ($sigint_pending || $sigint_processed);
 754 }
 755
 756 signal_loop();
 757 report();