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418 lines
12 KiB
418 lines
12 KiB
#!/usr/bin/env perl |
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# This is a POC (proof of concept or piece of crap, take your pick) for reading the |
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# text representation of trace output related to page allocation. It makes an attempt |
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# to extract some high-level information on what is going on. The accuracy of the parser |
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# may vary considerably |
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# |
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# Example usage: trace-pagealloc-postprocess.pl < /sys/kernel/debug/tracing/trace_pipe |
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# other options |
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# --prepend-parent Report on the parent proc and PID |
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# --read-procstat If the trace lacks process info, get it from /proc |
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# --ignore-pid Aggregate processes of the same name together |
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# |
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# Copyright (c) IBM Corporation 2009 |
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# Author: Mel Gorman <[email protected]> |
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use strict; |
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use Getopt::Long; |
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# Tracepoint events |
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use constant MM_PAGE_ALLOC => 1; |
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use constant MM_PAGE_FREE => 2; |
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use constant MM_PAGE_FREE_BATCHED => 3; |
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use constant MM_PAGE_PCPU_DRAIN => 4; |
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use constant MM_PAGE_ALLOC_ZONE_LOCKED => 5; |
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use constant MM_PAGE_ALLOC_EXTFRAG => 6; |
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use constant EVENT_UNKNOWN => 7; |
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# Constants used to track state |
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use constant STATE_PCPU_PAGES_DRAINED => 8; |
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use constant STATE_PCPU_PAGES_REFILLED => 9; |
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# High-level events extrapolated from tracepoints |
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use constant HIGH_PCPU_DRAINS => 10; |
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use constant HIGH_PCPU_REFILLS => 11; |
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use constant HIGH_EXT_FRAGMENT => 12; |
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use constant HIGH_EXT_FRAGMENT_SEVERE => 13; |
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use constant HIGH_EXT_FRAGMENT_MODERATE => 14; |
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use constant HIGH_EXT_FRAGMENT_CHANGED => 15; |
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my %perprocesspid; |
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my %perprocess; |
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my $opt_ignorepid; |
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my $opt_read_procstat; |
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my $opt_prepend_parent; |
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# Catch sigint and exit on request |
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my $sigint_report = 0; |
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my $sigint_exit = 0; |
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my $sigint_pending = 0; |
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my $sigint_received = 0; |
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sub sigint_handler { |
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my $current_time = time; |
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if ($current_time - 2 > $sigint_received) { |
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print "SIGINT received, report pending. Hit ctrl-c again to exit\n"; |
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$sigint_report = 1; |
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} else { |
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if (!$sigint_exit) { |
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print "Second SIGINT received quickly, exiting\n"; |
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} |
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$sigint_exit++; |
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} |
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if ($sigint_exit > 3) { |
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print "Many SIGINTs received, exiting now without report\n"; |
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exit; |
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} |
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$sigint_received = $current_time; |
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$sigint_pending = 1; |
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} |
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$SIG{INT} = "sigint_handler"; |
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# Parse command line options |
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GetOptions( |
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'ignore-pid' => \$opt_ignorepid, |
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'read-procstat' => \$opt_read_procstat, |
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'prepend-parent' => \$opt_prepend_parent, |
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); |
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# Defaults for dynamically discovered regex's |
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my $regex_fragdetails_default = 'page=([0-9a-f]*) pfn=([0-9]*) alloc_order=([-0-9]*) fallback_order=([-0-9]*) pageblock_order=([-0-9]*) alloc_migratetype=([-0-9]*) fallback_migratetype=([-0-9]*) fragmenting=([-0-9]) change_ownership=([-0-9])'; |
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# Dyanically discovered regex |
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my $regex_fragdetails; |
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# Static regex used. Specified like this for readability and for use with /o |
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# (process_pid) (cpus ) ( time ) (tpoint ) (details) |
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my $regex_traceevent = '\s*([a-zA-Z0-9-]*)\s*(\[[0-9]*\])\s*([0-9.]*):\s*([a-zA-Z_]*):\s*(.*)'; |
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my $regex_statname = '[-0-9]*\s\((.*)\).*'; |
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my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*'; |
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sub generate_traceevent_regex { |
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my $event = shift; |
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my $default = shift; |
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my $regex; |
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# Read the event format or use the default |
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if (!open (FORMAT, "/sys/kernel/debug/tracing/events/$event/format")) { |
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$regex = $default; |
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} else { |
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my $line; |
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while (!eof(FORMAT)) { |
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$line = <FORMAT>; |
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if ($line =~ /^print fmt:\s"(.*)",.*/) { |
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$regex = $1; |
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$regex =~ s/%p/\([0-9a-f]*\)/g; |
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$regex =~ s/%d/\([-0-9]*\)/g; |
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$regex =~ s/%lu/\([0-9]*\)/g; |
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} |
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} |
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} |
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# Verify fields are in the right order |
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my $tuple; |
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foreach $tuple (split /\s/, $regex) { |
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my ($key, $value) = split(/=/, $tuple); |
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my $expected = shift; |
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if ($key ne $expected) { |
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print("WARNING: Format not as expected '$key' != '$expected'"); |
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$regex =~ s/$key=\((.*)\)/$key=$1/; |
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} |
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} |
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if (defined shift) { |
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die("Fewer fields than expected in format"); |
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} |
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return $regex; |
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} |
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$regex_fragdetails = generate_traceevent_regex("kmem/mm_page_alloc_extfrag", |
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$regex_fragdetails_default, |
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"page", "pfn", |
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"alloc_order", "fallback_order", "pageblock_order", |
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"alloc_migratetype", "fallback_migratetype", |
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"fragmenting", "change_ownership"); |
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sub read_statline($) { |
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my $pid = $_[0]; |
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my $statline; |
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if (open(STAT, "/proc/$pid/stat")) { |
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$statline = <STAT>; |
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close(STAT); |
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} |
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if ($statline eq '') { |
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$statline = "-1 (UNKNOWN_PROCESS_NAME) R 0"; |
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} |
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return $statline; |
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} |
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sub guess_process_pid($$) { |
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my $pid = $_[0]; |
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my $statline = $_[1]; |
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if ($pid == 0) { |
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return "swapper-0"; |
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} |
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if ($statline !~ /$regex_statname/o) { |
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die("Failed to math stat line for process name :: $statline"); |
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} |
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return "$1-$pid"; |
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} |
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sub parent_info($$) { |
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my $pid = $_[0]; |
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my $statline = $_[1]; |
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my $ppid; |
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if ($pid == 0) { |
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return "NOPARENT-0"; |
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} |
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if ($statline !~ /$regex_statppid/o) { |
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die("Failed to match stat line process ppid:: $statline"); |
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} |
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# Read the ppid stat line |
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$ppid = $1; |
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return guess_process_pid($ppid, read_statline($ppid)); |
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} |
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sub process_events { |
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my $traceevent; |
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my $process_pid; |
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my $cpus; |
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my $timestamp; |
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my $tracepoint; |
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my $details; |
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my $statline; |
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# Read each line of the event log |
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EVENT_PROCESS: |
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while ($traceevent = <STDIN>) { |
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if ($traceevent =~ /$regex_traceevent/o) { |
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$process_pid = $1; |
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$tracepoint = $4; |
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if ($opt_read_procstat || $opt_prepend_parent) { |
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$process_pid =~ /(.*)-([0-9]*)$/; |
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my $process = $1; |
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my $pid = $2; |
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$statline = read_statline($pid); |
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if ($opt_read_procstat && $process eq '') { |
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$process_pid = guess_process_pid($pid, $statline); |
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} |
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if ($opt_prepend_parent) { |
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$process_pid = parent_info($pid, $statline) . " :: $process_pid"; |
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} |
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} |
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# Unnecessary in this script. Uncomment if required |
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# $cpus = $2; |
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# $timestamp = $3; |
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} else { |
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next; |
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} |
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# Perl Switch() sucks majorly |
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if ($tracepoint eq "mm_page_alloc") { |
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$perprocesspid{$process_pid}->{MM_PAGE_ALLOC}++; |
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} elsif ($tracepoint eq "mm_page_free") { |
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$perprocesspid{$process_pid}->{MM_PAGE_FREE}++ |
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} elsif ($tracepoint eq "mm_page_free_batched") { |
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$perprocesspid{$process_pid}->{MM_PAGE_FREE_BATCHED}++; |
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} elsif ($tracepoint eq "mm_page_pcpu_drain") { |
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$perprocesspid{$process_pid}->{MM_PAGE_PCPU_DRAIN}++; |
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_DRAINED}++; |
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} elsif ($tracepoint eq "mm_page_alloc_zone_locked") { |
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$perprocesspid{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED}++; |
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_REFILLED}++; |
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} elsif ($tracepoint eq "mm_page_alloc_extfrag") { |
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# Extract the details of the event now |
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$details = $5; |
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my ($page, $pfn); |
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my ($alloc_order, $fallback_order, $pageblock_order); |
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my ($alloc_migratetype, $fallback_migratetype); |
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my ($fragmenting, $change_ownership); |
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if ($details !~ /$regex_fragdetails/o) { |
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print "WARNING: Failed to parse mm_page_alloc_extfrag as expected\n"; |
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next; |
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} |
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$perprocesspid{$process_pid}->{MM_PAGE_ALLOC_EXTFRAG}++; |
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$page = $1; |
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$pfn = $2; |
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$alloc_order = $3; |
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$fallback_order = $4; |
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$pageblock_order = $5; |
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$alloc_migratetype = $6; |
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$fallback_migratetype = $7; |
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$fragmenting = $8; |
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$change_ownership = $9; |
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if ($fragmenting) { |
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAG}++; |
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if ($fallback_order <= 3) { |
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_SEVERE}++; |
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} else { |
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_MODERATE}++; |
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} |
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} |
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if ($change_ownership) { |
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$perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_CHANGED}++; |
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} |
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} else { |
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$perprocesspid{$process_pid}->{EVENT_UNKNOWN}++; |
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} |
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# Catch a full pcpu drain event |
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if ($perprocesspid{$process_pid}->{STATE_PCPU_PAGES_DRAINED} && |
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$tracepoint ne "mm_page_pcpu_drain") { |
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$perprocesspid{$process_pid}->{HIGH_PCPU_DRAINS}++; |
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_DRAINED} = 0; |
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} |
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# Catch a full pcpu refill event |
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if ($perprocesspid{$process_pid}->{STATE_PCPU_PAGES_REFILLED} && |
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$tracepoint ne "mm_page_alloc_zone_locked") { |
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$perprocesspid{$process_pid}->{HIGH_PCPU_REFILLS}++; |
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$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_REFILLED} = 0; |
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} |
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if ($sigint_pending) { |
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last EVENT_PROCESS; |
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} |
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} |
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} |
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sub dump_stats { |
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my $hashref = shift; |
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my %stats = %$hashref; |
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# Dump per-process stats |
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my $process_pid; |
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my $max_strlen = 0; |
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# Get the maximum process name |
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foreach $process_pid (keys %perprocesspid) { |
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my $len = length($process_pid); |
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if ($len > $max_strlen) { |
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$max_strlen = $len; |
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} |
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} |
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$max_strlen += 2; |
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printf("\n"); |
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printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s\n", |
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"Process", "Pages", "Pages", "Pages", "Pages", "PCPU", "PCPU", "PCPU", "Fragment", "Fragment", "MigType", "Fragment", "Fragment", "Unknown"); |
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printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s\n", |
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"details", "allocd", "allocd", "freed", "freed", "pages", "drains", "refills", "Fallback", "Causing", "Changed", "Severe", "Moderate", ""); |
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printf("%-" . $max_strlen . "s %8s %10s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s %8s\n", |
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"", "", "under lock", "direct", "pagevec", "drain", "", "", "", "", "", "", "", ""); |
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foreach $process_pid (keys %stats) { |
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# Dump final aggregates |
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if ($stats{$process_pid}->{STATE_PCPU_PAGES_DRAINED}) { |
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$stats{$process_pid}->{HIGH_PCPU_DRAINS}++; |
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$stats{$process_pid}->{STATE_PCPU_PAGES_DRAINED} = 0; |
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} |
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if ($stats{$process_pid}->{STATE_PCPU_PAGES_REFILLED}) { |
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$stats{$process_pid}->{HIGH_PCPU_REFILLS}++; |
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$stats{$process_pid}->{STATE_PCPU_PAGES_REFILLED} = 0; |
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} |
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printf("%-" . $max_strlen . "s %8d %10d %8d %8d %8d %8d %8d %8d %8d %8d %8d %8d %8d\n", |
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$process_pid, |
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$stats{$process_pid}->{MM_PAGE_ALLOC}, |
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$stats{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED}, |
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$stats{$process_pid}->{MM_PAGE_FREE}, |
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$stats{$process_pid}->{MM_PAGE_FREE_BATCHED}, |
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$stats{$process_pid}->{MM_PAGE_PCPU_DRAIN}, |
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$stats{$process_pid}->{HIGH_PCPU_DRAINS}, |
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$stats{$process_pid}->{HIGH_PCPU_REFILLS}, |
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$stats{$process_pid}->{MM_PAGE_ALLOC_EXTFRAG}, |
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$stats{$process_pid}->{HIGH_EXT_FRAG}, |
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$stats{$process_pid}->{HIGH_EXT_FRAGMENT_CHANGED}, |
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$stats{$process_pid}->{HIGH_EXT_FRAGMENT_SEVERE}, |
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$stats{$process_pid}->{HIGH_EXT_FRAGMENT_MODERATE}, |
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$stats{$process_pid}->{EVENT_UNKNOWN}); |
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} |
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} |
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sub aggregate_perprocesspid() { |
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my $process_pid; |
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my $process; |
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undef %perprocess; |
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foreach $process_pid (keys %perprocesspid) { |
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$process = $process_pid; |
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$process =~ s/-([0-9])*$//; |
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if ($process eq '') { |
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$process = "NO_PROCESS_NAME"; |
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} |
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$perprocess{$process}->{MM_PAGE_ALLOC} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC}; |
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$perprocess{$process}->{MM_PAGE_ALLOC_ZONE_LOCKED} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED}; |
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$perprocess{$process}->{MM_PAGE_FREE} += $perprocesspid{$process_pid}->{MM_PAGE_FREE}; |
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$perprocess{$process}->{MM_PAGE_FREE_BATCHED} += $perprocesspid{$process_pid}->{MM_PAGE_FREE_BATCHED}; |
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$perprocess{$process}->{MM_PAGE_PCPU_DRAIN} += $perprocesspid{$process_pid}->{MM_PAGE_PCPU_DRAIN}; |
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$perprocess{$process}->{HIGH_PCPU_DRAINS} += $perprocesspid{$process_pid}->{HIGH_PCPU_DRAINS}; |
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$perprocess{$process}->{HIGH_PCPU_REFILLS} += $perprocesspid{$process_pid}->{HIGH_PCPU_REFILLS}; |
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$perprocess{$process}->{MM_PAGE_ALLOC_EXTFRAG} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC_EXTFRAG}; |
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$perprocess{$process}->{HIGH_EXT_FRAG} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAG}; |
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$perprocess{$process}->{HIGH_EXT_FRAGMENT_CHANGED} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_CHANGED}; |
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$perprocess{$process}->{HIGH_EXT_FRAGMENT_SEVERE} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_SEVERE}; |
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$perprocess{$process}->{HIGH_EXT_FRAGMENT_MODERATE} += $perprocesspid{$process_pid}->{HIGH_EXT_FRAGMENT_MODERATE}; |
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$perprocess{$process}->{EVENT_UNKNOWN} += $perprocesspid{$process_pid}->{EVENT_UNKNOWN}; |
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} |
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} |
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sub report() { |
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if (!$opt_ignorepid) { |
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dump_stats(\%perprocesspid); |
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} else { |
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aggregate_perprocesspid(); |
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dump_stats(\%perprocess); |
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} |
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} |
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# Process events or signals until neither is available |
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sub signal_loop() { |
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my $sigint_processed; |
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do { |
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$sigint_processed = 0; |
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process_events(); |
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# Handle pending signals if any |
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if ($sigint_pending) { |
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my $current_time = time; |
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if ($sigint_exit) { |
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print "Received exit signal\n"; |
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$sigint_pending = 0; |
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} |
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if ($sigint_report) { |
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if ($current_time >= $sigint_received + 2) { |
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report(); |
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$sigint_report = 0; |
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$sigint_pending = 0; |
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$sigint_processed = 1; |
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} |
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} |
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} |
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} while ($sigint_pending || $sigint_processed); |
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} |
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signal_loop(); |
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report();
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