diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/trace/postprocess/trace-vmscan-postprocess.pl | 686 |
1 files changed, 686 insertions, 0 deletions
diff --git a/Documentation/trace/postprocess/trace-vmscan-postprocess.pl b/Documentation/trace/postprocess/trace-vmscan-postprocess.pl new file mode 100644 index 000000000000..1b55146d1c8d --- /dev/null +++ b/Documentation/trace/postprocess/trace-vmscan-postprocess.pl @@ -0,0 +1,686 @@ +#!/usr/bin/perl +# This is a POC for reading the text representation of trace output related to +# page reclaim. It makes an attempt to extract some high-level information on +# what is going on. The accuracy of the parser may vary +# +# Example usage: trace-vmscan-postprocess.pl < /sys/kernel/debug/tracing/trace_pipe +# other options +# --read-procstat If the trace lacks process info, get it from /proc +# --ignore-pid Aggregate processes of the same name together +# +# Copyright (c) IBM Corporation 2009 +# Author: Mel Gorman <mel@csn.ul.ie> +use strict; +use Getopt::Long; + +# Tracepoint events +use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN => 1; +use constant MM_VMSCAN_DIRECT_RECLAIM_END => 2; +use constant MM_VMSCAN_KSWAPD_WAKE => 3; +use constant MM_VMSCAN_KSWAPD_SLEEP => 4; +use constant MM_VMSCAN_LRU_SHRINK_ACTIVE => 5; +use constant MM_VMSCAN_LRU_SHRINK_INACTIVE => 6; +use constant MM_VMSCAN_LRU_ISOLATE => 7; +use constant MM_VMSCAN_WRITEPAGE_FILE_SYNC => 8; +use constant MM_VMSCAN_WRITEPAGE_ANON_SYNC => 9; +use constant MM_VMSCAN_WRITEPAGE_FILE_ASYNC => 10; +use constant MM_VMSCAN_WRITEPAGE_ANON_ASYNC => 11; +use constant MM_VMSCAN_WRITEPAGE_ASYNC => 12; +use constant EVENT_UNKNOWN => 13; + +# Per-order events +use constant MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER => 11; +use constant MM_VMSCAN_WAKEUP_KSWAPD_PERORDER => 12; +use constant MM_VMSCAN_KSWAPD_WAKE_PERORDER => 13; +use constant HIGH_KSWAPD_REWAKEUP_PERORDER => 14; + +# Constants used to track state +use constant STATE_DIRECT_BEGIN => 15; +use constant STATE_DIRECT_ORDER => 16; +use constant STATE_KSWAPD_BEGIN => 17; +use constant STATE_KSWAPD_ORDER => 18; + +# High-level events extrapolated from tracepoints +use constant HIGH_DIRECT_RECLAIM_LATENCY => 19; +use constant HIGH_KSWAPD_LATENCY => 20; +use constant HIGH_KSWAPD_REWAKEUP => 21; +use constant HIGH_NR_SCANNED => 22; +use constant HIGH_NR_TAKEN => 23; +use constant HIGH_NR_RECLAIM => 24; +use constant HIGH_NR_CONTIG_DIRTY => 25; + +my %perprocesspid; +my %perprocess; +my %last_procmap; +my $opt_ignorepid; +my $opt_read_procstat; + +my $total_wakeup_kswapd; +my ($total_direct_reclaim, $total_direct_nr_scanned); +my ($total_direct_latency, $total_kswapd_latency); +my ($total_direct_writepage_file_sync, $total_direct_writepage_file_async); +my ($total_direct_writepage_anon_sync, $total_direct_writepage_anon_async); +my ($total_kswapd_nr_scanned, $total_kswapd_wake); +my ($total_kswapd_writepage_file_sync, $total_kswapd_writepage_file_async); +my ($total_kswapd_writepage_anon_sync, $total_kswapd_writepage_anon_async); + +# Catch sigint and exit on request +my $sigint_report = 0; +my $sigint_exit = 0; +my $sigint_pending = 0; +my $sigint_received = 0; +sub sigint_handler { + my $current_time = time; + if ($current_time - 2 > $sigint_received) { + print "SIGINT received, report pending. Hit ctrl-c again to exit\n"; + $sigint_report = 1; + } else { + if (!$sigint_exit) { + print "Second SIGINT received quickly, exiting\n"; + } + $sigint_exit++; + } + + if ($sigint_exit > 3) { + print "Many SIGINTs received, exiting now without report\n"; + exit; + } + + $sigint_received = $current_time; + $sigint_pending = 1; +} +$SIG{INT} = "sigint_handler"; + +# Parse command line options +GetOptions( + 'ignore-pid' => \$opt_ignorepid, + 'read-procstat' => \$opt_read_procstat, +); + +# Defaults for dynamically discovered regex's +my $regex_direct_begin_default = 'order=([0-9]*) may_writepage=([0-9]*) gfp_flags=([A-Z_|]*)'; +my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)'; +my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)'; +my $regex_kswapd_sleep_default = 'nid=([0-9]*)'; +my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*)'; +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]*)'; +my $regex_lru_shrink_inactive_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) priority=([0-9]*)'; +my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)'; +my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)'; + +# Dyanically discovered regex +my $regex_direct_begin; +my $regex_direct_end; +my $regex_kswapd_wake; +my $regex_kswapd_sleep; +my $regex_wakeup_kswapd; +my $regex_lru_isolate; +my $regex_lru_shrink_inactive; +my $regex_lru_shrink_active; +my $regex_writepage; + +# Static regex used. Specified like this for readability and for use with /o +# (process_pid) (cpus ) ( time ) (tpoint ) (details) +my $regex_traceevent = '\s*([a-zA-Z0-9-]*)\s*(\[[0-9]*\])\s*([0-9.]*):\s*([a-zA-Z_]*):\s*(.*)'; +my $regex_statname = '[-0-9]*\s\((.*)\).*'; +my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*'; + +sub generate_traceevent_regex { + my $event = shift; + my $default = shift; + my $regex; + + # Read the event format or use the default + if (!open (FORMAT, "/sys/kernel/debug/tracing/events/$event/format")) { + print("WARNING: Event $event format string not found\n"); + return $default; + } else { + my $line; + while (!eof(FORMAT)) { + $line = <FORMAT>; + $line =~ s/, REC->.*//; + if ($line =~ /^print fmt:\s"(.*)".*/) { + $regex = $1; + $regex =~ s/%s/\([0-9a-zA-Z|_]*\)/g; + $regex =~ s/%p/\([0-9a-f]*\)/g; + $regex =~ s/%d/\([-0-9]*\)/g; + $regex =~ s/%ld/\([-0-9]*\)/g; + $regex =~ s/%lu/\([0-9]*\)/g; + } + } + } + + # Can't handle the print_flags stuff but in the context of this + # script, it really doesn't matter + $regex =~ s/\(REC.*\) \? __print_flags.*//; + + # Verify fields are in the right order + my $tuple; + foreach $tuple (split /\s/, $regex) { + my ($key, $value) = split(/=/, $tuple); + my $expected = shift; + if ($key ne $expected) { + print("WARNING: Format not as expected for event $event '$key' != '$expected'\n"); + $regex =~ s/$key=\((.*)\)/$key=$1/; + } + } + + if (defined shift) { + die("Fewer fields than expected in format"); + } + + return $regex; +} + +$regex_direct_begin = generate_traceevent_regex( + "vmscan/mm_vmscan_direct_reclaim_begin", + $regex_direct_begin_default, + "order", "may_writepage", + "gfp_flags"); +$regex_direct_end = generate_traceevent_regex( + "vmscan/mm_vmscan_direct_reclaim_end", + $regex_direct_end_default, + "nr_reclaimed"); +$regex_kswapd_wake = generate_traceevent_regex( + "vmscan/mm_vmscan_kswapd_wake", + $regex_kswapd_wake_default, + "nid", "order"); +$regex_kswapd_sleep = generate_traceevent_regex( + "vmscan/mm_vmscan_kswapd_sleep", + $regex_kswapd_sleep_default, + "nid"); +$regex_wakeup_kswapd = generate_traceevent_regex( + "vmscan/mm_vmscan_wakeup_kswapd", + $regex_wakeup_kswapd_default, + "nid", "zid", "order"); +$regex_lru_isolate = generate_traceevent_regex( + "vmscan/mm_vmscan_lru_isolate", + $regex_lru_isolate_default, + "isolate_mode", "order", + "nr_requested", "nr_scanned", "nr_taken", + "contig_taken", "contig_dirty", "contig_failed"); +$regex_lru_shrink_inactive = generate_traceevent_regex( + "vmscan/mm_vmscan_lru_shrink_inactive", + $regex_lru_shrink_inactive_default, + "nid", "zid", + "lru", + "nr_scanned", "nr_reclaimed", "priority"); +$regex_lru_shrink_active = generate_traceevent_regex( + "vmscan/mm_vmscan_lru_shrink_active", + $regex_lru_shrink_active_default, + "nid", "zid", + "lru", + "nr_scanned", "nr_rotated", "priority"); +$regex_writepage = generate_traceevent_regex( + "vmscan/mm_vmscan_writepage", + $regex_writepage_default, + "page", "pfn", "flags"); + +sub read_statline($) { + my $pid = $_[0]; + my $statline; + + if (open(STAT, "/proc/$pid/stat")) { + $statline = <STAT>; + close(STAT); + } + + if ($statline eq '') { + $statline = "-1 (UNKNOWN_PROCESS_NAME) R 0"; + } + + return $statline; +} + +sub guess_process_pid($$) { + my $pid = $_[0]; + my $statline = $_[1]; + + if ($pid == 0) { + return "swapper-0"; + } + + if ($statline !~ /$regex_statname/o) { + die("Failed to math stat line for process name :: $statline"); + } + return "$1-$pid"; +} + +# Convert sec.usec timestamp format +sub timestamp_to_ms($) { + my $timestamp = $_[0]; + + my ($sec, $usec) = split (/\./, $timestamp); + return ($sec * 1000) + ($usec / 1000); +} + +sub process_events { + my $traceevent; + my $process_pid; + my $cpus; + my $timestamp; + my $tracepoint; + my $details; + my $statline; + + # Read each line of the event log +EVENT_PROCESS: + while ($traceevent = <STDIN>) { + if ($traceevent =~ /$regex_traceevent/o) { + $process_pid = $1; + $timestamp = $3; + $tracepoint = $4; + + $process_pid =~ /(.*)-([0-9]*)$/; + my $process = $1; + my $pid = $2; + + if ($process eq "") { + $process = $last_procmap{$pid}; + $process_pid = "$process-$pid"; + } + $last_procmap{$pid} = $process; + + if ($opt_read_procstat) { + $statline = read_statline($pid); + if ($opt_read_procstat && $process eq '') { + $process_pid = guess_process_pid($pid, $statline); + } + } + } else { + next; + } + + # Perl Switch() sucks majorly + if ($tracepoint eq "mm_vmscan_direct_reclaim_begin") { + $timestamp = timestamp_to_ms($timestamp); + $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}++; + $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN} = $timestamp; + + $details = $5; + if ($details !~ /$regex_direct_begin/o) { + print "WARNING: Failed to parse mm_vmscan_direct_reclaim_begin as expected\n"; + print " $details\n"; + print " $regex_direct_begin\n"; + next; + } + my $order = $1; + $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order]++; + $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER} = $order; + } elsif ($tracepoint eq "mm_vmscan_direct_reclaim_end") { + # Count the event itself + my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END}; + $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_END}++; + + # Record how long direct reclaim took this time + if (defined $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN}) { + $timestamp = timestamp_to_ms($timestamp); + my $order = $perprocesspid{$process_pid}->{STATE_DIRECT_ORDER}; + my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_DIRECT_BEGIN}); + $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] = "$order-$latency"; + } + } elsif ($tracepoint eq "mm_vmscan_kswapd_wake") { + $details = $5; + if ($details !~ /$regex_kswapd_wake/o) { + print "WARNING: Failed to parse mm_vmscan_kswapd_wake as expected\n"; + print " $details\n"; + print " $regex_kswapd_wake\n"; + next; + } + + my $order = $2; + $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER} = $order; + if (!$perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN}) { + $timestamp = timestamp_to_ms($timestamp); + $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}++; + $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = $timestamp; + $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order]++; + } else { + $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP}++; + $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order]++; + } + } elsif ($tracepoint eq "mm_vmscan_kswapd_sleep") { + + # Count the event itself + my $index = $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP}; + $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_SLEEP}++; + + # Record how long kswapd was awake + $timestamp = timestamp_to_ms($timestamp); + my $order = $perprocesspid{$process_pid}->{STATE_KSWAPD_ORDER}; + my $latency = ($timestamp - $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN}); + $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index] = "$order-$latency"; + $perprocesspid{$process_pid}->{STATE_KSWAPD_BEGIN} = 0; + } elsif ($tracepoint eq "mm_vmscan_wakeup_kswapd") { + $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}++; + + $details = $5; + if ($details !~ /$regex_wakeup_kswapd/o) { + print "WARNING: Failed to parse mm_vmscan_wakeup_kswapd as expected\n"; + print " $details\n"; + print " $regex_wakeup_kswapd\n"; + next; + } + my $order = $3; + $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order]++; + } elsif ($tracepoint eq "mm_vmscan_lru_isolate") { + $details = $5; + if ($details !~ /$regex_lru_isolate/o) { + print "WARNING: Failed to parse mm_vmscan_lru_isolate as expected\n"; + print " $details\n"; + print " $regex_lru_isolate/o\n"; + next; + } + my $nr_scanned = $4; + my $nr_contig_dirty = $7; + $perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned; + $perprocesspid{$process_pid}->{HIGH_NR_CONTIG_DIRTY} += $nr_contig_dirty; + } elsif ($tracepoint eq "mm_vmscan_writepage") { + $details = $5; + if ($details !~ /$regex_writepage/o) { + print "WARNING: Failed to parse mm_vmscan_writepage as expected\n"; + print " $details\n"; + print " $regex_writepage\n"; + next; + } + + my $flags = $3; + my $file = 0; + my $sync_io = 0; + if ($flags =~ /RECLAIM_WB_FILE/) { + $file = 1; + } + if ($flags =~ /RECLAIM_WB_SYNC/) { + $sync_io = 1; + } + if ($sync_io) { + if ($file) { + $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}++; + } else { + $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}++; + } + } else { + if ($file) { + $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}++; + } else { + $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}++; + } + } + } else { + $perprocesspid{$process_pid}->{EVENT_UNKNOWN}++; + } + + if ($sigint_pending) { + last EVENT_PROCESS; + } + } +} + +sub dump_stats { + my $hashref = shift; + my %stats = %$hashref; + + # Dump per-process stats + my $process_pid; + my $max_strlen = 0; + + # Get the maximum process name + foreach $process_pid (keys %perprocesspid) { + my $len = length($process_pid); + if ($len > $max_strlen) { + $max_strlen = $len; + } + } + $max_strlen += 2; + + # Work out latencies + printf("\n") if !$opt_ignorepid; + printf("Reclaim latencies expressed as order-latency_in_ms\n") if !$opt_ignorepid; + foreach $process_pid (keys %stats) { + + if (!$stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[0] && + !$stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[0]) { + next; + } + + printf "%-" . $max_strlen . "s ", $process_pid if !$opt_ignorepid; + my $index = 0; + while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index] || + defined $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) { + + if ($stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) { + printf("%s ", $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) if !$opt_ignorepid; + my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]); + $total_direct_latency += $latency; + } else { + printf("%s ", $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]) if !$opt_ignorepid; + my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_KSWAPD_LATENCY}[$index]); + $total_kswapd_latency += $latency; + } + $index++; + } + print "\n" if !$opt_ignorepid; + } + + # Print out process activity + printf("\n"); + printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s\n", "Process", "Direct", "Wokeup", "Pages", "Pages", "Pages", "Time"); + printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s\n", "details", "Rclms", "Kswapd", "Scanned", "Sync-IO", "ASync-IO", "Stalled"); + foreach $process_pid (keys %stats) { + + if (!$stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) { + next; + } + + $total_direct_reclaim += $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}; + $total_wakeup_kswapd += $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}; + $total_direct_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED}; + $total_direct_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}; + $total_direct_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}; + $total_direct_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}; + + $total_direct_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}; + + my $index = 0; + my $this_reclaim_delay = 0; + while (defined $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]) { + my ($dummy, $latency) = split(/-/, $stats{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$index]); + $this_reclaim_delay += $latency; + $index++; + } + + printf("%-" . $max_strlen . "s %8d %10d %8u %8u %8u %8.3f", + $process_pid, + $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}, + $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}, + $stats{$process_pid}->{HIGH_NR_SCANNED}, + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}, + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}, + $this_reclaim_delay / 1000); + + if ($stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}) { + print " "; + for (my $order = 0; $order < 20; $order++) { + my $count = $stats{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order]; + if ($count != 0) { + print "direct-$order=$count "; + } + } + } + if ($stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}) { + print " "; + for (my $order = 0; $order < 20; $order++) { + my $count = $stats{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order]; + if ($count != 0) { + print "wakeup-$order=$count "; + } + } + } + if ($stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY}) { + print " "; + my $count = $stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY}; + if ($count != 0) { + print "contig-dirty=$count "; + } + } + + print "\n"; + } + + # Print out kswapd activity + printf("\n"); + printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s\n", "Kswapd", "Kswapd", "Order", "Pages", "Pages", "Pages"); + printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s\n", "Instance", "Wakeups", "Re-wakeup", "Scanned", "Sync-IO", "ASync-IO"); + foreach $process_pid (keys %stats) { + + if (!$stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) { + next; + } + + $total_kswapd_wake += $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}; + $total_kswapd_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED}; + $total_kswapd_writepage_file_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}; + $total_kswapd_writepage_anon_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}; + $total_kswapd_writepage_file_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}; + $total_kswapd_writepage_anon_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}; + + printf("%-" . $max_strlen . "s %8d %10d %8u %8i %8u", + $process_pid, + $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}, + $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP}, + $stats{$process_pid}->{HIGH_NR_SCANNED}, + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}, + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} + $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}); + + if ($stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}) { + print " "; + for (my $order = 0; $order < 20; $order++) { + my $count = $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order]; + if ($count != 0) { + print "wake-$order=$count "; + } + } + } + if ($stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP}) { + print " "; + for (my $order = 0; $order < 20; $order++) { + my $count = $stats{$process_pid}->{HIGH_KSWAPD_REWAKEUP_PERORDER}[$order]; + if ($count != 0) { + print "rewake-$order=$count "; + } + } + } + printf("\n"); + } + + # Print out summaries + $total_direct_latency /= 1000; + $total_kswapd_latency /= 1000; + print "\nSummary\n"; + print "Direct reclaims: $total_direct_reclaim\n"; + print "Direct reclaim pages scanned: $total_direct_nr_scanned\n"; + print "Direct reclaim write file sync I/O: $total_direct_writepage_file_sync\n"; + print "Direct reclaim write anon sync I/O: $total_direct_writepage_anon_sync\n"; + print "Direct reclaim write file async I/O: $total_direct_writepage_file_async\n"; + print "Direct reclaim write anon async I/O: $total_direct_writepage_anon_async\n"; + print "Wake kswapd requests: $total_wakeup_kswapd\n"; + printf "Time stalled direct reclaim: %-1.2f seconds\n", $total_direct_latency; + print "\n"; + print "Kswapd wakeups: $total_kswapd_wake\n"; + print "Kswapd pages scanned: $total_kswapd_nr_scanned\n"; + print "Kswapd reclaim write file sync I/O: $total_kswapd_writepage_file_sync\n"; + print "Kswapd reclaim write anon sync I/O: $total_kswapd_writepage_anon_sync\n"; + print "Kswapd reclaim write file async I/O: $total_kswapd_writepage_file_async\n"; + print "Kswapd reclaim write anon async I/O: $total_kswapd_writepage_anon_async\n"; + printf "Time kswapd awake: %-1.2f seconds\n", $total_kswapd_latency; +} + +sub aggregate_perprocesspid() { + my $process_pid; + my $process; + undef %perprocess; + + foreach $process_pid (keys %perprocesspid) { + $process = $process_pid; + $process =~ s/-([0-9])*$//; + if ($process eq '') { + $process = "NO_PROCESS_NAME"; + } + + $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN} += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN}; + $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE} += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE}; + $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD} += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD}; + $perprocess{$process}->{HIGH_KSWAPD_REWAKEUP} += $perprocesspid{$process_pid}->{HIGH_KSWAPD_REWAKEUP}; + $perprocess{$process}->{HIGH_NR_SCANNED} += $perprocesspid{$process_pid}->{HIGH_NR_SCANNED}; + $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}; + $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}; + $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_ASYNC}; + $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_ASYNC}; + + for (my $order = 0; $order < 20; $order++) { + $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_DIRECT_RECLAIM_BEGIN_PERORDER}[$order]; + $perprocess{$process}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_WAKEUP_KSWAPD_PERORDER}[$order]; + $perprocess{$process}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order] += $perprocesspid{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE_PERORDER}[$order]; + + } + + # Aggregate direct reclaim latencies + my $wr_index = $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END}; + my $rd_index = 0; + while (defined $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index]) { + $perprocess{$process}->{HIGH_DIRECT_RECLAIM_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_DIRECT_RECLAIM_LATENCY}[$rd_index]; + $rd_index++; + $wr_index++; + } + $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index; + + # Aggregate kswapd latencies + my $wr_index = $perprocess{$process}->{MM_VMSCAN_KSWAPD_SLEEP}; + my $rd_index = 0; + while (defined $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index]) { + $perprocess{$process}->{HIGH_KSWAPD_LATENCY}[$wr_index] = $perprocesspid{$process_pid}->{HIGH_KSWAPD_LATENCY}[$rd_index]; + $rd_index++; + $wr_index++; + } + $perprocess{$process}->{MM_VMSCAN_DIRECT_RECLAIM_END} = $wr_index; + } +} + +sub report() { + if (!$opt_ignorepid) { + dump_stats(\%perprocesspid); + } else { + aggregate_perprocesspid(); + dump_stats(\%perprocess); + } +} + +# Process events or signals until neither is available +sub signal_loop() { + my $sigint_processed; + do { + $sigint_processed = 0; + process_events(); + + # Handle pending signals if any + if ($sigint_pending) { + my $current_time = time; + + if ($sigint_exit) { + print "Received exit signal\n"; + $sigint_pending = 0; + } + if ($sigint_report) { + if ($current_time >= $sigint_received + 2) { + report(); + $sigint_report = 0; + $sigint_pending = 0; + $sigint_processed = 1; + } + } + } + } while ($sigint_pending || $sigint_processed); +} + +signal_loop(); +report(); |