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