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Subject[PATCH 3/9] vmscan: tracing: Update post-processing script to distinguish between anon and file IO from page reclaim
Date
It is useful to distinguish between IO for anon and file pages. This patch
updates
vmscan-tracing-add-a-postprocessing-script-for-reclaim-related-ftrace-events.patch
so the post-processing script can handle the additional information.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
---
.../trace/postprocess/trace-vmscan-postprocess.pl | 96 +++++++++++++-------
1 files changed, 64 insertions(+), 32 deletions(-)
diff --git a/Documentation/trace/postprocess/trace-vmscan-postprocess.pl b/Documentation/trace/postprocess/trace-vmscan-postprocess.pl
index d1ddc33..f87f56e 100644
--- a/Documentation/trace/postprocess/trace-vmscan-postprocess.pl
+++ b/Documentation/trace/postprocess/trace-vmscan-postprocess.pl
@@ -21,9 +21,12 @@ 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_SYNC => 8;
-use constant MM_VMSCAN_WRITEPAGE_ASYNC => 9;
-use constant EVENT_UNKNOWN => 10;
+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;
@@ -55,9 +58,11 @@ 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_sync, $total_direct_writepage_async);
+my ($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_sync, $total_kswapd_writepage_async);
+my ($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;
@@ -101,7 +106,7 @@ 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]*) sync_io=([0-9]*)';
+my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)';

# Dyanically discovered regex
my $regex_direct_begin;
@@ -209,7 +214,7 @@ $regex_lru_shrink_active = generate_traceevent_regex(
$regex_writepage = generate_traceevent_regex(
"vmscan/mm_vmscan_writepage",
$regex_writepage_default,
- "page", "pfn", "sync_io");
+ "page", "pfn", "flags");

sub read_statline($) {
my $pid = $_[0];
@@ -379,11 +384,27 @@ EVENT_PROCESS:
next;
}

- my $sync_io = $3;
+ 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) {
- $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_SYNC}++;
+ if ($file) {
+ $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_FILE_SYNC}++;
+ } else {
+ $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ANON_SYNC}++;
+ }
} else {
- $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ASYNC}++;
+ 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}++;
@@ -427,7 +448,7 @@ sub dump_stats {
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}[$index]) {
+ if ($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;
@@ -454,8 +475,11 @@ sub dump_stats {
$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_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_SYNC};
- $total_direct_writepage_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ASYNC};
+ $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;
@@ -470,8 +494,8 @@ sub dump_stats {
$stats{$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_SYNC},
- $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ASYNC},
+ $stats{$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}) {
@@ -515,16 +539,18 @@ sub dump_stats {

$total_kswapd_wake += $stats{$process_pid}->{MM_VMSCAN_KSWAPD_WAKE};
$total_kswapd_nr_scanned += $stats{$process_pid}->{HIGH_NR_SCANNED};
- $total_kswapd_writepage_sync += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_SYNC};
- $total_kswapd_writepage_async += $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ASYNC};
+ $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_SYNC},
- $stats{$process_pid}->{MM_VMSCAN_WRITEPAGE_ASYNC});
+ $stats{$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 " ";
@@ -551,18 +577,22 @@ sub dump_stats {
$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 sync I/O: $total_direct_writepage_sync\n";
- print "Direct reclaim write async I/O: $total_direct_writepage_async\n";
- print "Wake kswapd requests: $total_wakeup_kswapd\n";
- printf "Time stalled direct reclaim: %-1.2f ms\n", $total_direct_latency;
+ 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 ms\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 sync I/O: $total_kswapd_writepage_sync\n";
- print "Kswapd reclaim write async I/O: $total_kswapd_writepage_async\n";
- printf "Time kswapd awake: %-1.2f ms\n", $total_kswapd_latency;
+ 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 ms\n", $total_kswapd_latency;
}

sub aggregate_perprocesspid() {
@@ -582,8 +612,10 @@ sub aggregate_perprocesspid() {
$perprocess{$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_SYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_SYNC};
- $perprocess{$process}->{MM_VMSCAN_WRITEPAGE_ASYNC} += $perprocesspid{$process_pid}->{MM_VMSCAN_WRITEPAGE_ASYNC};
+ $perprocess{$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];
--
1.7.1


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