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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 <[email protected]>
13use strict;
14use Getopt::Long;
15
16# Tracepoint events
17use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN => 1;
18use constant MM_VMSCAN_DIRECT_RECLAIM_END => 2;
19use constant MM_VMSCAN_KSWAPD_WAKE => 3;
20use constant MM_VMSCAN_KSWAPD_SLEEP => 4;
21use constant MM_VMSCAN_LRU_SHRINK_ACTIVE => 5;
22use constant MM_VMSCAN_LRU_SHRINK_INACTIVE => 6;
23use constant MM_VMSCAN_LRU_ISOLATE => 7;
24use constant MM_VMSCAN_WRITEPAGE_FILE_SYNC => 8;
25use constant MM_VMSCAN_WRITEPAGE_ANON_SYNC => 9;
26use constant MM_VMSCAN_WRITEPAGE_FILE_ASYNC => 10;
27use constant MM_VMSCAN_WRITEPAGE_ANON_ASYNC => 11;
28use constant MM_VMSCAN_WRITEPAGE_ASYNC => 12;
29use constant EVENT_UNKNOWN => 13;
30
31# Per-order events
32use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER => 11;
33use constant MM_VMSCAN_WAKEUP_KSWAPD_PERORDER => 12;
34use constant MM_VMSCAN_KSWAPD_WAKE_PERORDER => 13;
35use constant HIGH_KSWAPD_REWAKEUP_PERORDER => 14;
36
37# Constants used to track state
38use constant STATE_DIRECT_BEGIN => 15;
39use constant STATE_DIRECT_ORDER => 16;
40use constant STATE_KSWAPD_BEGIN => 17;
41use constant STATE_KSWAPD_ORDER => 18;
42
43# High-level events extrapolated from tracepoints
44use constant HIGH_DIRECT_RECLAIM_LATENCY => 19;
45use constant HIGH_KSWAPD_LATENCY => 20;
46use constant HIGH_KSWAPD_REWAKEUP => 21;
47use constant HIGH_NR_SCANNED => 22;
48use constant HIGH_NR_TAKEN => 23;
49use constant HIGH_NR_RECLAIMED => 24;
50use constant HIGH_NR_FILE_SCANNED => 25;
51use constant HIGH_NR_ANON_SCANNED => 26;
52use constant HIGH_NR_FILE_RECLAIMED => 27;
53use constant HIGH_NR_ANON_RECLAIMED => 28;
54
55my %perprocesspid;
56my %perprocess;
57my %last_procmap;
58my $opt_ignorepid;
59my $opt_read_procstat;
60
61my $total_wakeup_kswapd;
62my ($total_direct_reclaim, $total_direct_nr_scanned);
63my ($total_direct_nr_file_scanned, $total_direct_nr_anon_scanned);
64my ($total_direct_latency, $total_kswapd_latency);
65my ($total_direct_nr_reclaimed);
66my ($total_direct_nr_file_reclaimed, $total_direct_nr_anon_reclaimed);
67my ($total_direct_writepage_file_sync, $total_direct_writepage_file_async);
68my ($total_direct_writepage_anon_sync, $total_direct_writepage_anon_async);
69my ($total_kswapd_nr_scanned, $total_kswapd_wake);
70my ($total_kswapd_nr_file_scanned, $total_kswapd_nr_anon_scanned);
71my ($total_kswapd_writepage_file_sync, $total_kswapd_writepage_file_async);
72my ($total_kswapd_writepage_anon_sync, $total_kswapd_writepage_anon_async);
73my ($total_kswapd_nr_reclaimed);
74my ($total_kswapd_nr_file_reclaimed, $total_kswapd_nr_anon_reclaimed);
75
76# Catch sigint and exit on request
77my $sigint_report = 0;
78my $sigint_exit = 0;
79my $sigint_pending = 0;
80my $sigint_received = 0;
81sub 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
104GetOptions(
105 'ignore-pid' => \$opt_ignorepid,
106 'read-procstat' => \$opt_read_procstat,
107);
108
109# Defaults for dynamically discovered regex's
110my $regex_direct_begin_default = 'order=([0-9]*) gfp_flags=([A-Z_|]*)';
111my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)';
112my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)';
113my $regex_kswapd_sleep_default = 'nid=([0-9]*)';
114my $regex_wakeup_kswapd_default = 'nid=([0-9]*) order=([0-9]*) gfp_flags=([A-Z_|]*)';
115my $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_]*)';
116my $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_|]*)';
117my $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_|]*)' ;
118my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)';
119
120# Dyanically discovered regex
121my $regex_direct_begin;
122my $regex_direct_end;
123my $regex_kswapd_wake;
124my $regex_kswapd_sleep;
125my $regex_wakeup_kswapd;
126my $regex_lru_isolate;
127my $regex_lru_shrink_inactive;
128my $regex_lru_shrink_active;
129my $regex_writepage;
130
131# Static regex used. Specified like this for readability and for use with /o
132# (process_pid) (cpus ) ( time ) (tpoint ) (details)
133my $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*(.*)';
134my $regex_statname = '[-0-9]*\s\((.*)\).*';
135my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*';
136
137sub 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 $regex_writepage_default,
225 "page", "pfn", "flags");
226
227sub read_statline($) {
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
243sub 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
258sub timestamp_to_ms($) {
259 my $timestamp = $_[0];
260
261 my ($sec, $usec) = split (/\./, $timestamp);
262 return ($sec * 1000) + ($usec / 1000);
263}
264
265sub process_events {
266 my $traceevent;
267 my $process_pid;
268 my $cpus;
269 my $timestamp;
270 my $tracepoint;
271 my $details;
272 my $statline;
273
274 # Read each line of the event log
275EVENT_PROCESS:
276 while ($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
457sub 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
659sub 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} = $wr_index;
712 }
713}
714
715sub report() {
716 if (!$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
725sub 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
751signal_loop();
752report();