release/src-rt-6.x.4708/linux/linux-2.6.36/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_RECLAIM                    => 24;
  50 use constant HIGH_NR_CONTIG_DIRTY               => 25;
  51
  52 my %perprocesspid;
  53 my %perprocess;
  54 my %last_procmap;
  55 my $opt_ignorepid;
  56 my $opt_read_procstat;
  57
  58 my $total_wakeup_kswapd;
  59 my ($total_direct_reclaim, $total_direct_nr_scanned);
  60 my ($total_direct_latency, $total_kswapd_latency);
  61 my ($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
  67 # Catch sigint and exit on request
  68 my $sigint_report = 0;
  69 my $sigint_exit = 0;
  70 my $sigint_pending = 0;
  71 my $sigint_received = 0;
  72 sub sigint_handler {
  73         my $current_time = time;
  74         if ($current_time - 2 > $sigint_received) {
  75                 print "SIGINT received, report pending. Hit ctrl-c again to exit\n";
  76                 $sigint_report = 1;
  77         } else {
  78                 if (!$sigint_exit) {
  79                         print "Second SIGINT received quickly, exiting\n";
  80                 }
  81                 $sigint_exit++;
  82         }
  83
  84         if ($sigint_exit > 3) {
  85                 print "Many SIGINTs received, exiting now without report\n";
  86                 exit;
  87         }
  88
  89         $sigint_received = $current_time;
  90         $sigint_pending = 1;
  91 }
  92 $SIG{INT} = "sigint_handler";
  93
  94 # Parse command line options
  95 GetOptions(
  96         'ignore-pid'     =>     \$opt_ignorepid,
  97         'read-procstat'  =>     \$opt_read_procstat,
  98 );
  99
 100 # Defaults for dynamically discovered regex's
 101 my $regex_direct_begin_default = 'order=([0-9]*) may_writepage=([0-9]*) gfp_flags=([A-Z_|]*)';
 102 my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)';
 103 my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)';
 104 my $regex_kswapd_sleep_default = 'nid=([0-9]*)';
 105 my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*)';
 106 my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_taken=([0-9]*) contig_taken=([0-9]*) contig_dirty=([0-9]*) contig_failed=([0-9]*)';
 107 my $regex_lru_shrink_inactive_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) priority=([0-9]*)';
 108 my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)';
 109 my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)';
 110
 111 # Dyanically discovered regex
 112 my $regex_direct_begin;
 113 my $regex_direct_end;
 114 my $regex_kswapd_wake;
 115 my $regex_kswapd_sleep;
 116 my $regex_wakeup_kswapd;
 117 my $regex_lru_isolate;
 118 my $regex_lru_shrink_inactive;
 119 my $regex_lru_shrink_active;
 120 my $regex_writepage;
 121
 122 # Static regex used. Specified like this for readability and for use with /o
 123 #                      (process_pid)     (cpus      )   ( time  )   (tpoint    ) (details)
 124 my $regex_traceevent = '\s*([a-zA-Z0-9-]*)\s*(\[[0-9]*\])\s*([0-9.]*):\s*([a-zA-Z_]*):\s*(.*)';
 125 my $regex_statname = '[-0-9]*\s\((.*)\).*';
 126 my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*';
 127
 128 sub generate_traceevent_regex {
 129         my $event = shift;
 130         my $default = shift;
 131         my $regex;
 132
 133         # Read the event format or use the default
 134         if (!open (FORMAT, "/sys/kernel/debug/tracing/events/$event/format")) {
 135                 print("WARNING: Event $event format string not found\n");
 136                 return $default;
 137         } else {
 138                 my $line;
 139                 while (!eof(FORMAT)) {
 140                         $line = <FORMAT>;
 141                         $line =~ s/, REC->.*//;
 142                         if ($line =~ /^print fmt:\s"(.*)".*/) {
 143                                 $regex = $1;
 144                                 $regex =~ s/%s/\([0-9a-zA-Z|_]*\)/g;
 145                                 $regex =~ s/%p/\([0-9a-f]*\)/g;
 146                                 $regex =~ s/%d/\([-0-9]*\)/g;
 147                                 $regex =~ s/%ld/\([-0-9]*\)/g;
 148                                 $regex =~ s/%lu/\([0-9]*\)/g;
 149                         }
 150                 }
 151         }
 152
 153         # Can't handle the print_flags stuff but in the context of this
 154         # script, it really doesn't matter
 155         $regex =~ s/\(REC.*\) \? __print_flags.*//;
 156
 157         # Verify fields are in the right order
 158         my $tuple;
 159         foreach $tuple (split /\s/, $regex) {
 160                 my ($key, $value) = split(/=/, $tuple);
 161                 my $expected = shift;
 162                 if ($key ne $expected) {
 163                         print("WARNING: Format not as expected for event $event '$key' != '$expected'\n");
 164                         $regex =~ s/$key=\((.*)\)/$key=$1/;
 165                 }
 166         }
 167
 168         if (defined shift) {
 169                 die("Fewer fields than expected in format");
 170         }
 171
 172         return $regex;
 173 }
 174
 175 $regex_direct_begin = generate_traceevent_regex(
 176                         "vmscan/mm_vmscan_direct_reclaim_begin",
 177                         $regex_direct_begin_default,
 178                         "order", "may_writepage",
 179                         "gfp_flags");
 180 $regex_direct_end = generate_traceevent_regex(
 181                         "vmscan/mm_vmscan_direct_reclaim_end",
 182                         $regex_direct_end_default,
 183                         "nr_reclaimed");
 184 $regex_kswapd_wake = generate_traceevent_regex(
 185                         "vmscan/mm_vmscan_kswapd_wake",
 186                         $regex_kswapd_wake_default,
 187                         "nid", "order");
 188 $regex_kswapd_sleep = generate_traceevent_regex(
 189                         "vmscan/mm_vmscan_kswapd_sleep",
 190                         $regex_kswapd_sleep_default,
 191                         "nid");
 192 $regex_wakeup_kswapd = generate_traceevent_regex(
 193                         "vmscan/mm_vmscan_wakeup_kswapd",
 194                         $regex_wakeup_kswapd_default,
 195                         "nid", "zid", "order");
 196 $regex_lru_isolate = generate_traceevent_regex(
 197                         "vmscan/mm_vmscan_lru_isolate",
 198                         $regex_lru_isolate_default,
 199                         "isolate_mode", "order",
 200                         "nr_requested", "nr_scanned", "nr_taken",
 201                         "contig_taken", "contig_dirty", "contig_failed");
 202 $regex_lru_shrink_inactive = generate_traceevent_regex(
 203                         "vmscan/mm_vmscan_lru_shrink_inactive",
 204                         $regex_lru_shrink_inactive_default,
 205                         "nid", "zid",
 206                         "lru",
 207                         "nr_scanned", "nr_reclaimed", "priority");
 208 $regex_lru_shrink_active = generate_traceevent_regex(
 209                         "vmscan/mm_vmscan_lru_shrink_active",
 210                         $regex_lru_shrink_active_default,
 211                         "nid", "zid",
 212                         "lru",
 213                         "nr_scanned", "nr_rotated", "priority");
 214 $regex_writepage = generate_traceevent_regex(
 215                         "vmscan/mm_vmscan_writepage",
 216                         $regex_writepage_default,
 217                         "page", "pfn", "flags");
 218
 219 sub read_statline($) {
 220         my $pid = $_[0];
 221         my $statline;
 222
 223         if (open(STAT, "/proc/$pid/stat")) {
 224                 $statline = <STAT>;
 225                 close(STAT);
 226         }
 227
 228         if ($statline eq '') {
 229                 $statline = "-1 (UNKNOWN_PROCESS_NAME) R 0";
 230         }
 231
 232         return $statline;
 233 }
 234
 235 sub guess_process_pid($$) {
 236         my $pid = $_[0];
 237         my $statline = $_[1];
 238
 239         if ($pid == 0) {
 240                 return "swapper-0";
 241         }
 242
 243         if ($statline !~ /$regex_statname/o) {
 244                 die("Failed to math stat line for process name :: $statline");
 245         }
 246         return "$1-$pid";
 247 }
 248
 249 # Convert sec.usec timestamp format
 250 sub timestamp_to_ms($) {
 251         my $timestamp = $_[0];
 252
 253         my ($sec, $usec) = split (/\./, $timestamp);
 254         return ($sec * 1000) + ($usec / 1000);
 255 }
 256
 257 sub process_events {
 258         my $traceevent;
 259         my $process_pid;
 260         my $cpus;
 261         my $timestamp;
 262         my $tracepoint;
 263         my $details;
 264         my $statline;
 265
 266         # Read each line of the event log
 267 EVENT_PROCESS:
 268         while ($traceevent = <STDIN>) {
 269                 if ($traceevent =~ /$regex_traceevent/o) {
 270                         $process_pid = $1;
 271                         $timestamp = $3;
 272                         $tracepoint = $4;
 273
 274                         $process_pid =~ /(.*)-([0-9]*)$/;
 275                         my $process = $1;
 276                         my $pid = $2;
 277
 278                         if ($process eq "") {
 279                                 $process = $last_procmap{$pid};
 280                                 $process_pid = "$process-$pid";
 281                         }
 282                         $last_procmap{$pid} = $process;
 283
 284                         if ($opt_read_procstat) {
 285                                 $statline = read_statline($pid);
 286                                 if ($opt_read_procstat && $process eq '') {
 287                                         $process_pid = guess_process_pid($pid, $statline);
 288                                 }
 289                         }
 290                 } else {
 291                         next;
 292                 }
 293
 294                 # Perl Switch() sucks majorly
 295                 if ($tracepoint eq "mm_vmscan_direct_reclaim_begin") {
 296                         $timestamp = timestamp_to_ms($timestamp);
 297                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}++;
 298                         $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN} = $timestamp;
 299
 300                         $details = $5;
 301                         if ($details !~ /$regex_direct_begin/o) {
 302                                 print "WARNING: Failed to parse mm_vmscan_direct_reclaim_begin as expected\n";
 303                                 print "         $details\n";
 304                                 print "         $regex_direct_begin\n";
 305                                 next;
 306                         }
 307                         my $order = $1;
 308                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order]++;
 309                         $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER} = $order;
 310                 } elsif ($tracepoint eq "mm_vmscan_direct_reclaim_end") {
 311                         # Count the event itself
 312                         my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END};
 313                         $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END}++;
 314
 315                         # Record how long direct reclaim took this time
 316                         if (defined $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN}) {
 317                                 $timestamp = timestamp_to_ms($timestamp);
 318                                 my $order = $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER};
 319                                 my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN});
 320                                 $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] = "$order-$latency";
 321                         }
 322                 } elsif ($tracepoint eq "mm_vmscan_kswapd_wake") {
 323                         $details = $5;
 324                         if ($details !~ /$regex_kswapd_wake/o) {
 325                                 print "WARNING: Failed to parse mm_vmscan_kswapd_wake as expected\n";
 326                                 print "         $details\n";
 327                                 print "         $regex_kswapd_wake\n";
 328                                 next;
 329                         }
 330
 331                         my $order = $2;
 332                         $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER} = $order;
 333                         if (!$perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN}) {
 334                                 $timestamp = timestamp_to_ms($timestamp);
 335                                 $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}++;
 336                                 $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = $timestamp;
 337                                 $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order]++;
 338                         } else {
 339                                 $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP}++;
 340                                 $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order]++;
 341                         }
 342                 } elsif ($tracepoint eq "mm_vmscan_kswapd_sleep") {
 343
 344                         # Count the event itself
 345                         my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP};
 346                         $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP}++;
 347
 348                         # Record how long kswapd was awake
 349                         $timestamp = timestamp_to_ms($timestamp);
 350                         my $order = $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER};
 351                         my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN});
 352                         $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index] = "$order-$latency";
 353                         $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = 0;
 354                 } elsif ($tracepoint eq "mm_vmscan_wakeup_kswapd") {
 355                         $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}++;
 356
 357                         $details = $5;
 358                         if ($details !~ /$regex_wakeup_kswapd/o) {
 359                                 print "WARNING: Failed to parse mm_vmscan_wakeup_kswapd as expected\n";
 360                                 print "         $details\n";
 361                                 print "         $regex_wakeup_kswapd\n";
 362                                 next;
 363                         }
 364                         my $order = $3;
 365                         $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order]++;
 366                 } elsif ($tracepoint eq "mm_vmscan_lru_isolate") {
 367                         $details = $5;
 368                         if ($details !~ /$regex_lru_isolate/o) {
 369                                 print "WARNING: Failed to parse mm_vmscan_lru_isolate as expected\n";
 370                                 print "         $details\n";
 371                                 print "         $regex_lru_isolate/o\n";
 372                                 next;
 373                         }
 374                         my $nr_scanned = $4;
 375                         my $nr_contig_dirty = $7;
 376                         $perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned;
 377                         $perprocesspid{$process_pid}->{HIGH_NR_CONTIG_DIRTY} += $nr_contig_dirty;
 378                 } elsif ($tracepoint eq "mm_vmscan_writepage") {
 379                         $details = $5;
 380                         if ($details !~ /$regex_writepage/o) {
 381                                 print "WARNING: Failed to parse mm_vmscan_writepage as expected\n";
 382                                 print "         $details\n";
 383                                 print "         $regex_writepage\n";
 384                                 next;
 385                         }
 386
 387                         my $flags = $3;
 388                         my $file = 0;
 389                         my $sync_io = 0;
 390                         if ($flags =~ /RECLAIM_WB_FILE/) {
 391                                 $file = 1;
 392                         }
 393                         if ($flags =~ /RECLAIM_WB_SYNC/) {
 394                                 $sync_io = 1;
 395                         }
 396                         if ($sync_io) {
 397                                 if ($file) {
 398                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}++;
 399                                 } else {
 400                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}++;
 401                                 }
 402                         } else {
 403                                 if ($file) {
 404                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}++;
 405                                 } else {
 406                                         $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}++;
 407                                 }
 408                         }
 409                 } else {
 410                         $perprocesspid{$process_pid}->{EVENT_UNKNOWN}++;
 411                 }
 412
 413                 if ($sigint_pending) {
 414                         last EVENT_PROCESS;
 415                 }
 416         }
 417 }
 418
 419 sub dump_stats {
 420         my $hashref = shift;
 421         my %stats = %$hashref;
 422
 423         # Dump per-process stats
 424         my $process_pid;
 425         my $max_strlen = 0;
 426
 427         # Get the maximum process name
 428         foreach $process_pid (keys %perprocesspid) {
 429                 my $len = length($process_pid);
 430                 if ($len > $max_strlen) {
 431                         $max_strlen = $len;
 432                 }
 433         }
 434         $max_strlen += 2;
 435
 436         # Work out latencies
 437         printf("\n") if !$opt_ignorepid;
 438         printf("Reclaim latencies expressed as order-latency_in_ms\n") if !$opt_ignorepid;
 439         foreach $process_pid (keys %stats) {
 440
 441                 if (!$stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[0] &&
 442                                 !$stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[0]) {
 443                         next;
 444                 }
 445
 446                 printf "%-" . $max_strlen . "s ", $process_pid if !$opt_ignorepid;
 447                 my $index = 0;
 448                 while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] ||
 449                         defined $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) {
 450
 451                         if ($stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
 452                                 printf("%s ", $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) if !$opt_ignorepid;
 453                                 my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
 454                                 $total_direct_latency += $latency;
 455                         } else {
 456                                 printf("%s ", $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) if !$opt_ignorepid;
 457                                 my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]);
 458                                 $total_kswapd_latency += $latency;
 459                         }
 460                         $index++;
 461                 }
 462                 print "\n" if !$opt_ignorepid;
 463         }
 464
 465         # Print out process activity
 466         printf("\n");
 467         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s %8s\n", "Process", "Direct",  "Wokeup", "Pages",   "Pages",   "Pages",     "Time");
 468         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s %8s\n", "details", "Rclms",   "Kswapd", "Scanned", "Sync-IO", "ASync-IO",  "Stalled");
 469         foreach $process_pid (keys %stats) {
 470
 471                 if (!$stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
 472                         next;
 473                 }
 474
 475                 $total_direct_reclaim += $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
 476                 $total_wakeup_kswapd += $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 477                 $total_direct_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
 478                 $total_direct_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 479                 $total_direct_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 480                 $total_direct_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 481
 482                 $total_direct_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 483
 484                 my $index = 0;
 485                 my $this_reclaim_delay = 0;
 486                 while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) {
 487                          my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]);
 488                         $this_reclaim_delay += $latency;
 489                         $index++;
 490                 }
 491
 492                 printf("%-" . $max_strlen . "s %8d %10d   %8u   %8u %8u %8.3f",
 493                         $process_pid,
 494                         $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN},
 495                         $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD},
 496                         $stats{$process_pid}->{HIGH_NR_SCANNED},
 497                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 498                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC},
 499                         $this_reclaim_delay / 1000);
 500
 501                 if ($stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) {
 502                         print "      ";
 503                         for (my $order = 0; $order < 20; $order++) {
 504                                 my $count = $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
 505                                 if ($count != 0) {
 506                                         print "direct-$order=$count ";
 507                                 }
 508                         }
 509                 }
 510                 if ($stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}) {
 511                         print "      ";
 512                         for (my $order = 0; $order < 20; $order++) {
 513                                 my $count = $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
 514                                 if ($count != 0) {
 515                                         print "wakeup-$order=$count ";
 516                                 }
 517                         }
 518                 }
 519                 if ($stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY}) {
 520                         print "      ";
 521                         my $count = $stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY};
 522                         if ($count != 0) {
 523                                 print "contig-dirty=$count ";
 524                         }
 525                 }
 526
 527                 print "\n";
 528         }
 529
 530         # Print out kswapd activity
 531         printf("\n");
 532         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s\n", "Kswapd",   "Kswapd",  "Order",     "Pages",   "Pages",  "Pages");
 533         printf("%-" . $max_strlen . "s %8s %10s   %8s   %8s %8s %8s\n", "Instance", "Wakeups", "Re-wakeup", "Scanned", "Sync-IO", "ASync-IO");
 534         foreach $process_pid (keys %stats) {
 535
 536                 if (!$stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
 537                         next;
 538                 }
 539
 540                 $total_kswapd_wake += $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
 541                 $total_kswapd_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
 542                 $total_kswapd_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 543                 $total_kswapd_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 544                 $total_kswapd_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 545                 $total_kswapd_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 546
 547                 printf("%-" . $max_strlen . "s %8d %10d   %8u   %8i %8u",
 548                         $process_pid,
 549                         $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE},
 550                         $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP},
 551                         $stats{$process_pid}->{HIGH_NR_SCANNED},
 552                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC},
 553                         $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC});
 554
 555                 if ($stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) {
 556                         print "      ";
 557                         for (my $order = 0; $order < 20; $order++) {
 558                                 my $count = $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
 559                                 if ($count != 0) {
 560                                         print "wake-$order=$count ";
 561                                 }
 562                         }
 563                 }
 564                 if ($stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP}) {
 565                         print "      ";
 566                         for (my $order = 0; $order < 20; $order++) {
 567                                 my $count = $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order];
 568                                 if ($count != 0) {
 569                                         print "rewake-$order=$count ";
 570                                 }
 571                         }
 572                 }
 573                 printf("\n");
 574         }
 575
 576         # Print out summaries
 577         $total_direct_latency /= 1000;
 578         $total_kswapd_latency /= 1000;
 579         print "\nSummary\n";
 580         print "Direct reclaims:                         $total_direct_reclaim\n";
 581         print "Direct reclaim pages scanned:            $total_direct_nr_scanned\n";
 582         print "Direct reclaim write file sync I/O:      $total_direct_writepage_file_sync\n";
 583         print "Direct reclaim write anon sync I/O:      $total_direct_writepage_anon_sync\n";
 584         print "Direct reclaim write file async I/O:     $total_direct_writepage_file_async\n";
 585         print "Direct reclaim write anon async I/O:     $total_direct_writepage_anon_async\n";
 586         print "Wake kswapd requests:                    $total_wakeup_kswapd\n";
 587         printf "Time stalled direct reclaim:            %-1.2f seconds\n", $total_direct_latency;
 588         print "\n";
 589         print "Kswapd wakeups:                          $total_kswapd_wake\n";
 590         print "Kswapd pages scanned:                    $total_kswapd_nr_scanned\n";
 591         print "Kswapd reclaim write file sync I/O:      $total_kswapd_writepage_file_sync\n";
 592         print "Kswapd reclaim write anon sync I/O:      $total_kswapd_writepage_anon_sync\n";
 593         print "Kswapd reclaim write file async I/O:     $total_kswapd_writepage_file_async\n";
 594         print "Kswapd reclaim write anon async I/O:     $total_kswapd_writepage_anon_async\n";
 595         printf "Time kswapd awake:                      %-1.2f seconds\n", $total_kswapd_latency;
 596 }
 597
 598 sub aggregate_perprocesspid() {
 599         my $process_pid;
 600         my $process;
 601         undef %perprocess;
 602
 603         foreach $process_pid (keys %perprocesspid) {
 604                 $process = $process_pid;
 605                 $process =~ s/-([0-9])*$//;
 606                 if ($process eq '') {
 607                         $process = "NO_PROCESS_NAME";
 608                 }
 609
 610                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN} += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN};
 611                 $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE} += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
 612                 $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD} += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD};
 613                 $perprocess{$process}->{HIGH_KSWAPD_REWAKEUP} += $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP};
 614                 $perprocess{$process}->{HIGH_NR_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_SCANNED};
 615                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC};
 616                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC};
 617                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC};
 618                 $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC};
 619
 620                 for (my $order = 0; $order < 20; $order++) {
 621                         $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order];
 622                         $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order];
 623                         $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order];
 624
 625                 }
 626
 627                 # Aggregate direct reclaim latencies
 628                 my $wr_index = $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END};
 629                 my $rd_index = 0;
 630                 while (defined $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index]) {
 631                         $perprocess{$process}->{HIGH_DIRECT_RECLAIM_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index];
 632                         $rd_index++;
 633                         $wr_index++;
 634                 }
 635                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
 636
 637                 # Aggregate kswapd latencies
 638                 my $wr_index = $perprocess{$process}->{MM_VMSCAN_KSWAPD_SLEEP};
 639                 my $rd_index = 0;
 640                 while (defined $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index]) {
 641                         $perprocess{$process}->{HIGH_KSWAPD_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index];
 642                         $rd_index++;
 643                         $wr_index++;
 644                 }
 645                 $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index;
 646         }
 647 }
 648
 649 sub report() {
 650         if (!$opt_ignorepid) {
 651                 dump_stats(\%perprocesspid);
 652         } else {
 653                 aggregate_perprocesspid();
 654                 dump_stats(\%perprocess);
 655         }
 656 }
 657
 658 # Process events or signals until neither is available
 659 sub signal_loop() {
 660         my $sigint_processed;
 661         do {
 662                 $sigint_processed = 0;
 663                 process_events();
 664
 665                 # Handle pending signals if any
 666                 if ($sigint_pending) {
 667                         my $current_time = time;
 668
 669                         if ($sigint_exit) {
 670                                 print "Received exit signal\n";
 671                                 $sigint_pending = 0;
 672                         }
 673                         if ($sigint_report) {
 674                                 if ($current_time >= $sigint_received + 2) {
 675                                         report();
 676                                         $sigint_report = 0;
 677                                         $sigint_pending = 0;
 678                                         $sigint_processed = 1;
 679                                 }
 680                         }
 681                 }
 682         } while ($sigint_pending || $sigint_processed);
 683 }
 684
 685 signal_loop();
 686 report();