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

   1 #!/usr/bin/env 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/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]*) 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]*) order=([0-9]*) gfp_flags=([A-Z_|]*)';
 115 my $regex_lru_isolate_default = 'classzone=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_skipped=([0-9]*) nr_taken=([0-9]*) lru=([a-z_]*)';
 116 my $regex_lru_shrink_inactive_default = 'nid=([0-9]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) nr_dirty=([0-9]*) nr_writeback=([0-9]*) nr_congested=([0-9]*) nr_immediate=([0-9]*) nr_activate_anon=([0-9]*) nr_activate_file=([0-9]*) nr_ref_keep=([0-9]*) nr_unmap_fail=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)';
 117 my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_taken=([0-9]*) nr_active=([0-9]*) nr_deactivated=([0-9]*) nr_referenced=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)' ;
 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 $regex;
 141
 142         # Read the event format or use the default
 143         if (!open (FORMAT, "/sys/kernel/tracing/events/$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", "gfp_flags");
 188 $regex_direct_end = generate_traceevent_regex(
 189                         "vmscan/mm_vmscan_direct_reclaim_end",
 190                         $regex_direct_end_default,
 191                         "nr_reclaimed");
 192 $regex_kswapd_wake = generate_traceevent_regex(
 193                         "vmscan/mm_vmscan_kswapd_wake",
 194                         $regex_kswapd_wake_default,
 195                         "nid", "order");
 196 $regex_kswapd_sleep = generate_traceevent_regex(
 197                         "vmscan/mm_vmscan_kswapd_sleep",
 198                         $regex_kswapd_sleep_default,
 199                         "nid");
 200 $regex_wakeup_kswapd = generate_traceevent_regex(
 201                         "vmscan/mm_vmscan_wakeup_kswapd",
 202                         $regex_wakeup_kswapd_default,
 203                         "nid", "order", "gfp_flags");
 204 $regex_lru_isolate = generate_traceevent_regex(
 205                         "vmscan/mm_vmscan_lru_isolate",
 206                         $regex_lru_isolate_default,
 207                         "classzone", "order",
 208                         "nr_requested", "nr_scanned", "nr_skipped", "nr_taken",
 209                         "lru");
 210 $regex_lru_shrink_inactive = generate_traceevent_regex(
 211                         "vmscan/mm_vmscan_lru_shrink_inactive",
 212                         $regex_lru_shrink_inactive_default,
 213                         "nid", "nr_scanned", "nr_reclaimed", "nr_dirty", "nr_writeback",
 214                         "nr_congested", "nr_immediate", "nr_activate_anon",
 215                         "nr_activate_file", "nr_ref_keep",
 216                         "nr_unmap_fail", "priority", "flags");
 217 $regex_lru_shrink_active = generate_traceevent_regex(
 218                         "vmscan/mm_vmscan_lru_shrink_active",
 219                         $regex_lru_shrink_active_default,
 220                         "nid", "nr_taken", "nr_active", "nr_deactivated", "nr_referenced",
 221                         "priority", "flags");
 222 $regex_writepage = generate_traceevent_regex(
 223                         "vmscan/mm_vmscan_write_folio",
 224                         $regex_writepage_default,
 225                         "page", "pfn", "flags");
 226
 227 sub read_statline($) {
 228         my $pid = $_[0];
 229         my $statline;
 230
 231         if (open(STAT, "/proc/$pid/stat")) {
 232                 $statline = <STAT>;
 233                 close(STAT);
 234         }
 235
 236         if ($statline eq '') {
 237                 $statline = "-1 (UNKNOWN_PROCESS_NAME) R 0";
 238         }
 239
 240         return $statline;
 241 }
 242
 243 sub guess_process_pid($$) {
 244         my $pid = $_[0];
 245         my $statline = $_[1];
 246
 247         if ($pid == 0) {
 248                 return "swapper-0";
 249         }
 250
 251         if ($statline !~ /$regex_statname/o) {
 252                 die("Failed to math stat line for process name :: $statline");
 253         }
 254         return "$1-$pid";
 255 }
 256
 257 # Convert sec.usec timestamp format
 258 sub timestamp_to_ms($) {
 259         my $timestamp = $_[0];
 260
 261         my ($sec, $usec) = split (/\./, $timestamp);
 262         return ($sec * 1000) + ($usec / 1000);
 263 }
 264
 265 sub process_events {
 266         my $traceevent;
 267         my $process_pid;
 268         my $cpus;
 269         my $timestamp;
 270         my $tracepoint;
 271         my $details;
 272         my $statline;
 273
 274         # Read each line of the event log
 275 EVENT_PROCESS:
 276         while ($traceevent = <STDIN>) {
 277                 if ($traceevent =~ /$regex_traceevent/o) {
 278                         $process_pid = $1;
 279                         $timestamp = $4;
 280                         $tracepoint = $5;
 281
 282                         $process_pid =~ /(.*)-([0-9]*)$/;
 283                         my $process = $1;
 284                         my $pid = $2;
 285
 286                         if ($process eq "") {
 287                                 $process = $last_procmap{$pid};
 288                                 $process_pid = "$process-$pid";
 289                         }
 290                         $last_procmap{$pid} = $process;
 291
 292                         if ($opt_read_procstat) {
 293                                 $statline = read_statline($pid);
 294                                 if ($opt_read_procstat && $process eq '') {
 295                                         $process_pid = guess_process_pid($pid, $statline);
 296                                 }
 297                         }
 298                 } else {
 299                         next;
 300                 }
 301
 302                 # Perl Switch() sucks majorly
 303                 if ($tracepoint eq "mm_vmscan_direct_reclaim_begin") {
 304                         $timestamp = timestamp_to_ms($timestamp);
 305                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}++;
 306                         $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN} = $timestamp;
 307
 308                         $details = $6;
 309                         if ($details !~ /$regex_direct_begin/o) {
 310                                 print "WARNING: Failed to parse mm_vmscan_direct_reclaim_begin as expected\n";
 311                                 print "         $details\n";
 312                                 print "         $regex_direct_begin\n";
 313                                 next;
 314                         }
 315                         my $order = $1;
 316                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order]++;
 317                         $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER} = $order;
 318                 } elsif ($tracepoint eq "mm_vmscan_direct_reclaim_end") {
 319                         # Count the event itself
 320                         my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END};
 321                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END}++;
 322
 323                         # Record how long direct reclaim took this time
 324                         if (defined $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN}) {
 325                                 $timestamp = timestamp_to_ms($timestamp);
 326                                 my $order = $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER};
 327                                 my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN});
 328                                 $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] = "$order-$latency";
 329                         }
 330                 } elsif ($tracepoint eq "mm_vmscan_kswapd_wake") {
 331                         $details = $6;
 332                         if ($details !~ /$regex_kswapd_wake/o) {
 333                                 print "WARNING: Failed to parse mm_vmscan_kswapd_wake as expected\n";
 334                                 print "         $details\n";
 335                                 print "         $regex_kswapd_wake\n";
 336                                 next;
 337                         }
 338
 339                         my $order = $2;
 340                         $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER} = $order;
 341                         if (!$perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN}) {
 342                                 $timestamp = timestamp_to_ms($timestamp);
 343                                 $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}++;
 344                                 $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = $timestamp;
 345                                 $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order]++;
 346                         } else {
 347                                 $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP}++;
 348                                 $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order]++;
 349                         }
 350                 } elsif ($tracepoint eq "mm_vmscan_kswapd_sleep") {
 351
 352                         # Count the event itself
 353                         my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP};
 354                         $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP}++;
 355
 356                         # Record how long kswapd was awake
 357                         $timestamp = timestamp_to_ms($timestamp);
 358                         my $order = $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER};
 359                         my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN});
 360                         $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index] = "$order-$latency";
 361                         $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = 0;
 362                 } elsif ($tracepoint eq "mm_vmscan_wakeup_kswapd") {
 363                         $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}++;
 364
 365                         $details = $6;
 366                         if ($details !~ /$regex_wakeup_kswapd/o) {
 367                                 print "WARNING: Failed to parse mm_vmscan_wakeup_kswapd as expected\n";
 368                                 print "         $details\n";
 369                                 print "         $regex_wakeup_kswapd\n";
 370                                 next;
 371                         }
 372                         my $order = $2;
 373                         $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order]++;
 374                 } elsif ($tracepoint eq "mm_vmscan_lru_isolate") {
 375                         $details = $6;
 376                         if ($details !~ /$regex_lru_isolate/o) {
 377                                 print "WARNING: Failed to parse mm_vmscan_lru_isolate as expected\n";
 378                                 print "         $details\n";
 379                                 print "         $regex_lru_isolate/o\n";
 380                                 next;
 381                         }
 382                         my $nr_scanned = $4;
 383                         my $lru = $7;
 384
 385                         # To closer match vmstat scanning statistics, only count
 386                         # inactive lru as scanning
 387                         if ($lru =~ /inactive_/) {
 388                                 $perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned;
 389                                 if ($lru =~ /_file/) {
 390                                         $perprocesspid{$process_pid}->{HIGH_NR_FILE_SCANNED} += $nr_scanned;
 391                                 } else {
 392                                         $perprocesspid{$process_pid}->{HIGH_NR_ANON_SCANNED} += $nr_scanned;
 393                                 }
 394                         }
 395                 } elsif ($tracepoint eq "mm_vmscan_lru_shrink_inactive") {
 396                         $details = $6;
 397                         if ($details !~ /$regex_lru_shrink_inactive/o) {
 398                                 print "WARNING: Failed to parse mm_vmscan_lru_shrink_inactive as expected\n";
 399                                 print "         $details\n";
 400                                 print "         $regex_lru_shrink_inactive/o\n";
 401                                 next;
 402                         }
 403
 404                         my $nr_reclaimed = $3;
 405                         my $flags = $13;
 406                         my $file = 0;
 407                         if ($flags =~ /RECLAIM_WB_FILE/) {
 408                                 $file = 1;
 409                         }
 410                         $perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED} += $nr_reclaimed;
 411                         if ($file) {
 412                                 $perprocesspid{$process_pid}->{HIGH_NR_FILE_RECLAIMED} += $nr_reclaimed;
 413                         } else {
 414                                 $perprocesspid{$process_pid}->{HIGH_NR_ANON_RECLAIMED} += $nr_reclaimed;
 415                         }
 416                 } elsif ($tracepoint eq "mm_vmscan_writepage") {
 417                         $details = $6;
 418                         if ($details !~ /$regex_writepage/o) {
 419                                 print "WARNING: Failed to parse mm_vmscan_writepage as expected\n";
 420                                 print "         $details\n";
 421                                 print "         $regex_writepage\n";
 422                                 next;
 423                         }
 424
 425                         my $flags = $3;
 426                         my $file = 0;
 427                         my $sync_io = 0;
 428                         if ($flags =~ /RECLAIM_WB_FILE/) {
 429                                 $file = 1;
 430                         }
 431                         if ($flags =~ /RECLAIM_WB_SYNC/) {
 432                                 $sync_io = 1;
 433                         }
 434                         if ($sync_io) {
 435                                 if ($file) {
 436                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}++;
 437                                 } else {
 438                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}++;
 439                                 }
 440                         } else {
 441                                 if ($file) {
 442                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}++;
 443                                 } else {
 444                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}++;
 445                                 }
 446                         }
 447                 } else {
 448                         $perprocesspid{$process_pid}->{EVENT_UNKNOWN}++;
 449                 }
 450
 451                 if ($sigint_pending) {
 452                         last EVENT_PROCESS;
 453                 }
 454         }
 455 }
 456
 457 sub dump_stats {
 458         my $hashref = shift;
 459         my %stats = %$hashref;
 460
 461         # Dump per-process stats
 462         my $process_pid;
 463         my $max_strlen = 0;
 464
 465         # Get the maximum process name
 466         foreach $process_pid (keys %perprocesspid) {
 467                 my $len = length($process_pid);
 468                 if ($len > $max_strlen) {
 469                         $max_strlen = $len;
 470                 }
 471         }
 472         $max_strlen += 2;
 473
 474         # Work out latencies
 475         printf("\n") if !$opt_ignorepid;
 476         printf("Reclaim latencies expressed as order-latency_in_ms\n") if !$opt_ignorepid;
 477         foreach $process_pid (keys %stats) {
 478
 479                 if (!$stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[0] &&
 480                                 !$stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[0]) {
 481                         next;
 482                 }
 483
 484                 printf "%-" . $max_strlen . "s ", $process_pid if !$opt_ignorepid;
 485                 my $index = 0;
 486                 while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] ||
 487                         defined $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) {
 488
 489                         if ($stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
 490                                 printf("%s ", $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) if !$opt_ignorepid;
 491                                 my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
 492                                 $total_direct_latency += $latency;
 493                         } else {
 494                                 printf("%s ", $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) if !$opt_ignorepid;
 495                                 my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]);
 496                                 $total_kswapd_latency += $latency;
 497                         }
 498                         $index++;
 499                 }
 500                 print "\n" if !$opt_ignorepid;
 501         }
 502
 503         # Print out process activity
 504         printf("\n");
 505         printf("%-" . $max_strlen . "s %8s %10s   %8s %8s  %8s %8s %8s %8s\n", "Process", "Direct",  "Wokeup", "Pages",   "Pages",   "Pages",   "Pages",     "Time");
 506         printf("%-" . $max_strlen . "s %8s %10s   %8s %8s  %8s %8s %8s %8s\n", "details", "Rclms",   "Kswapd", "Scanned", "Rclmed",  "Sync-IO", "ASync-IO",  "Stalled");
 507         foreach $process_pid (keys %stats) {
 508
 509                 if (!$stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
 510                         next;
 511                 }
 512
 513                 $total_direct_reclaim += $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
 514                 $total_wakeup_kswapd += $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 515                 $total_direct_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
 516                 $total_direct_nr_file_scanned += $stats{$process_pid}->{HIGH_NR_FILE_SCANNED};
 517                 $total_direct_nr_anon_scanned += $stats{$process_pid}->{HIGH_NR_ANON_SCANNED};
 518                 $total_direct_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
 519                 $total_direct_nr_file_reclaimed += $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
 520                 $total_direct_nr_anon_reclaimed += $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 521                 $total_direct_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 522                 $total_direct_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 523                 $total_direct_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 524
 525                 $total_direct_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 526
 527                 my $index = 0;
 528                 my $this_reclaim_delay = 0;
 529                 while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
 530                          my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
 531                         $this_reclaim_delay += $latency;
 532                         $index++;
 533                 }
 534
 535                 printf("%-" . $max_strlen . "s %8d %10d   %8u %8u  %8u %8u %8.3f",
 536                         $process_pid,
 537                         $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN},
 538                         $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD},
 539                         $stats{$process_pid}->{HIGH_NR_SCANNED},
 540                         $stats{$process_pid}->{HIGH_NR_FILE_SCANNED},
 541                         $stats{$process_pid}->{HIGH_NR_ANON_SCANNED},
 542                         $stats{$process_pid}->{HIGH_NR_RECLAIMED},
 543                         $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED},
 544                         $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED},
 545                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 546                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC},
 547                         $this_reclaim_delay / 1000);
 548
 549                 if ($stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
 550                         print "      ";
 551                         for (my $order = 0; $order < 20; $order++) {
 552                                 my $count = $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
 553                                 if ($count != 0) {
 554                                         print "direct-$order=$count ";
 555                                 }
 556                         }
 557                 }
 558                 if ($stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}) {
 559                         print "      ";
 560                         for (my $order = 0; $order < 20; $order++) {
 561                                 my $count = $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
 562                                 if ($count != 0) {
 563                                         print "wakeup-$order=$count ";
 564                                 }
 565                         }
 566                 }
 567
 568                 print "\n";
 569         }
 570
 571         # Print out kswapd activity
 572         printf("\n");
 573         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s\n", "Kswapd",   "Kswapd",  "Order",     "Pages",   "Pages",   "Pages",  "Pages");
 574         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s\n", "Instance", "Wakeups", "Re-wakeup", "Scanned", "Rclmed",  "Sync-IO", "ASync-IO");
 575         foreach $process_pid (keys %stats) {
 576
 577                 if (!$stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
 578                         next;
 579                 }
 580
 581                 $total_kswapd_wake += $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
 582                 $total_kswapd_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
 583                 $total_kswapd_nr_file_scanned += $stats{$process_pid}->{HIGH_NR_FILE_SCANNED};
 584                 $total_kswapd_nr_anon_scanned += $stats{$process_pid}->{HIGH_NR_ANON_SCANNED};
 585                 $total_kswapd_nr_reclaimed += $stats{$process_pid}->{HIGH_NR_RECLAIMED};
 586                 $total_kswapd_nr_file_reclaimed += $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
 587                 $total_kswapd_nr_anon_reclaimed += $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 588                 $total_kswapd_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 589                 $total_kswapd_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 590                 $total_kswapd_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 591                 $total_kswapd_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 592
 593                 printf("%-" . $max_strlen . "s %8d %10d   %8u %8u  %8i %8u",
 594                         $process_pid,
 595                         $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE},
 596                         $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP},
 597                         $stats{$process_pid}->{HIGH_NR_SCANNED},
 598                         $stats{$process_pid}->{HIGH_NR_FILE_SCANNED},
 599                         $stats{$process_pid}->{HIGH_NR_ANON_SCANNED},
 600                         $stats{$process_pid}->{HIGH_NR_RECLAIMED},
 601                         $stats{$process_pid}->{HIGH_NR_FILE_RECLAIMED},
 602                         $stats{$process_pid}->{HIGH_NR_ANON_RECLAIMED},
 603                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 604                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC});
 605
 606                 if ($stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
 607                         print "      ";
 608                         for (my $order = 0; $order < 20; $order++) {
 609                                 my $count = $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
 610                                 if ($count != 0) {
 611                                         print "wake-$order=$count ";
 612                                 }
 613                         }
 614                 }
 615                 if ($stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP}) {
 616                         print "      ";
 617                         for (my $order = 0; $order < 20; $order++) {
 618                                 my $count = $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order];
 619                                 if ($count != 0) {
 620                                         print "rewake-$order=$count ";
 621                                 }
 622                         }
 623                 }
 624                 printf("\n");
 625         }
 626
 627         # Print out summaries
 628         $total_direct_latency /= 1000;
 629         $total_kswapd_latency /= 1000;
 630         print "\nSummary\n";
 631         print "Direct reclaims:                         $total_direct_reclaim\n";
 632         print "Direct reclaim pages scanned:            $total_direct_nr_scanned\n";
 633         print "Direct reclaim file pages scanned:       $total_direct_nr_file_scanned\n";
 634         print "Direct reclaim anon pages scanned:       $total_direct_nr_anon_scanned\n";
 635         print "Direct reclaim pages reclaimed:          $total_direct_nr_reclaimed\n";
 636         print "Direct reclaim file pages reclaimed:     $total_direct_nr_file_reclaimed\n";
 637         print "Direct reclaim anon pages reclaimed:     $total_direct_nr_anon_reclaimed\n";
 638         print "Direct reclaim write file sync I/O:      $total_direct_writepage_file_sync\n";
 639         print "Direct reclaim write anon sync I/O:      $total_direct_writepage_anon_sync\n";
 640         print "Direct reclaim write file async I/O:     $total_direct_writepage_file_async\n";
 641         print "Direct reclaim write anon async I/O:     $total_direct_writepage_anon_async\n";
 642         print "Wake kswapd requests:                    $total_wakeup_kswapd\n";
 643         printf "Time stalled direct reclaim:            %-1.2f seconds\n", $total_direct_latency;
 644         print "\n";
 645         print "Kswapd wakeups:                          $total_kswapd_wake\n";
 646         print "Kswapd pages scanned:                    $total_kswapd_nr_scanned\n";
 647         print "Kswapd file pages scanned:               $total_kswapd_nr_file_scanned\n";
 648         print "Kswapd anon pages scanned:               $total_kswapd_nr_anon_scanned\n";
 649         print "Kswapd pages reclaimed:                  $total_kswapd_nr_reclaimed\n";
 650         print "Kswapd file pages reclaimed:             $total_kswapd_nr_file_reclaimed\n";
 651         print "Kswapd anon pages reclaimed:             $total_kswapd_nr_anon_reclaimed\n";
 652         print "Kswapd reclaim write file sync I/O:      $total_kswapd_writepage_file_sync\n";
 653         print "Kswapd reclaim write anon sync I/O:      $total_kswapd_writepage_anon_sync\n";
 654         print "Kswapd reclaim write file async I/O:     $total_kswapd_writepage_file_async\n";
 655         print "Kswapd reclaim write anon async I/O:     $total_kswapd_writepage_anon_async\n";
 656         printf "Time kswapd awake:                      %-1.2f seconds\n", $total_kswapd_latency;
 657 }
 658
 659 sub aggregate_perprocesspid() {
 660         my $process_pid;
 661         my $process;
 662         undef %perprocess;
 663
 664         foreach $process_pid (keys %perprocesspid) {
 665                 $process = $process_pid;
 666                 $process =~ s/-([0-9])*$//;
 667                 if ($process eq '') {
 668                         $process = "NO_PROCESS_NAME";
 669                 }
 670
 671                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN} += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
 672                 $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE} += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
 673                 $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD} += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 674                 $perprocess{$process}->{HIGH_KSWAPD_REWAKEUP} += $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP};
 675                 $perprocess{$process}->{HIGH_NR_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_SCANNED};
 676                 $perprocess{$process}->{HIGH_NR_FILE_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_FILE_SCANNED};
 677                 $perprocess{$process}->{HIGH_NR_ANON_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_ANON_SCANNED};
 678                 $perprocess{$process}->{HIGH_NR_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_RECLAIMED};
 679                 $perprocess{$process}->{HIGH_NR_FILE_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_FILE_RECLAIMED};
 680                 $perprocess{$process}->{HIGH_NR_ANON_RECLAIMED} += $perprocesspid{$process_pid}->{HIGH_NR_ANON_RECLAIMED};
 681                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 682                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 683                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 684                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 685
 686                 for (my $order = 0; $order < 20; $order++) {
 687                         $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
 688                         $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
 689                         $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
 690
 691                 }
 692
 693                 # Aggregate direct reclaim latencies
 694                 my $wr_index = $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END};
 695                 my $rd_index = 0;
 696                 while (defined $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index]) {
 697                         $perprocess{$process}->{HIGH_DIRECT_RECLAIM_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index];
 698                         $rd_index++;
 699                         $wr_index++;
 700                 }
 701                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
 702
 703                 # Aggregate kswapd latencies
 704                 my $wr_index = $perprocess{$process}->{MM_VMSCAN_KSWAPD_SLEEP};
 705                 my $rd_index = 0;
 706                 while (defined $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index]) {
 707                         $perprocess{$process}->{HIGH_KSWAPD_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index];
 708                         $rd_index++;
 709                         $wr_index++;
 710                 }
 711                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
 712         }
 713 }
 714
 715 sub report() {
 716         if (!$opt_ignorepid) {
 717                 dump_stats(\%perprocesspid);
 718         } else {
 719                 aggregate_perprocesspid();
 720                 dump_stats(\%perprocess);
 721         }
 722 }
 723
 724 # Process events or signals until neither is available
 725 sub signal_loop() {
 726         my $sigint_processed;
 727         do {
 728                 $sigint_processed = 0;
 729                 process_events();
 730
 731                 # Handle pending signals if any
 732                 if ($sigint_pending) {
 733                         my $current_time = time;
 734
 735                         if ($sigint_exit) {
 736                                 print "Received exit signal\n";
 737                                 $sigint_pending = 0;
 738                         }
 739                         if ($sigint_report) {
 740                                 if ($current_time >= $sigint_received + 2) {
 741                                         report();
 742                                         $sigint_report = 0;
 743                                         $sigint_pending = 0;
 744                                         $sigint_processed = 1;
 745                                 }
 746                         }
 747                 }
 748         } while ($sigint_pending || $sigint_processed);
 749 }
 750
 751 signal_loop();
 752 report();