16c00db4bb
Pull AFS fixes from David Howells:
"Here's a set of patches that fix a number of bugs in the in-kernel AFS
client, including:
- Fix directory locking to not use individual page locks for
directory reading/scanning but rather to use a semaphore on the
afs_vnode struct as the directory contents must be read in a single
blob and data from different reads must not be mixed as the entire
contents may be shuffled about between reads.
- Fix address list parsing to handle port specifiers correctly.
- Only give up callback records on a server if we actually talked to
that server (we might not be able to access a server).
- Fix some callback handling bugs, including refcounting,
whole-volume callbacks and when callbacks actually get broken in
response to a CB.CallBack op.
- Fix some server/address rotation bugs, including giving up if we
can't probe a server; giving up if a server says it doesn't have a
volume, but there are more servers to try.
- Fix the decoding of fetched statuses to be OpenAFS compatible.
- Fix the handling of server lookups in Cache Manager ops (such as
CB.InitCallBackState3) to use a UUID if possible and to handle no
server being found.
- Fix a bug in server lookup where not all addresses are compared.
- Fix the non-encryption of calls that prevents some servers from
being accessed (this also requires an AF_RXRPC patch that has
already gone in through the net tree).
There's also a patch that adds tracepoints to log Cache Manager ops
that don't find a matching server, either by UUID or by address"
* tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: Fix the non-encryption of calls
afs: Fix CB.CallBack handling
afs: Fix whole-volume callback handling
afs: Fix afs_find_server search loop
afs: Fix the handling of an unfound server in CM operations
afs: Add a tracepoint to record callbacks from unlisted servers
afs: Fix the handling of CB.InitCallBackState3 to find the server by UUID
afs: Fix VNOVOL handling in address rotation
afs: Fix AFSFetchStatus decoder to provide OpenAFS compatibility
afs: Fix server rotation's handling of fileserver probe failure
afs: Fix refcounting in callback registration
afs: Fix giving up callbacks on server destruction
afs: Fix address list parsing
afs: Fix directory page locking
108 lines
2.7 KiB
Perl
108 lines
2.7 KiB
Perl
#!/usr/bin/perl -w
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# (c) 2009, Tom Zanussi <tzanussi@gmail.com>
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# Licensed under the terms of the GNU GPL License version 2
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# Display avg/min/max wakeup latency
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# The common_* event handler fields are the most useful fields common to
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# all events. They don't necessarily correspond to the 'common_*' fields
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# in the status files. Those fields not available as handler params can
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# be retrieved via script functions of the form get_common_*().
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use 5.010000;
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use strict;
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use warnings;
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use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
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use lib "./Perf-Trace-Util/lib";
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use Perf::Trace::Core;
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use Perf::Trace::Util;
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my %last_wakeup;
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my $max_wakeup_latency;
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my $min_wakeup_latency;
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my $total_wakeup_latency = 0;
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my $total_wakeups = 0;
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sub sched::sched_switch
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm,
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$prev_comm, $prev_pid, $prev_prio, $prev_state, $next_comm, $next_pid,
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$next_prio) = @_;
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my $wakeup_ts = $last_wakeup{$common_cpu}{ts};
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if ($wakeup_ts) {
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my $switch_ts = nsecs($common_secs, $common_nsecs);
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my $wakeup_latency = $switch_ts - $wakeup_ts;
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if ($wakeup_latency > $max_wakeup_latency) {
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$max_wakeup_latency = $wakeup_latency;
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}
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if ($wakeup_latency < $min_wakeup_latency) {
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$min_wakeup_latency = $wakeup_latency;
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}
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$total_wakeup_latency += $wakeup_latency;
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$total_wakeups++;
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}
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$last_wakeup{$common_cpu}{ts} = 0;
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}
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sub sched::sched_wakeup
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm,
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$comm, $pid, $prio, $success, $target_cpu) = @_;
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$last_wakeup{$target_cpu}{ts} = nsecs($common_secs, $common_nsecs);
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}
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sub trace_begin
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{
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$min_wakeup_latency = 1000000000;
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$max_wakeup_latency = 0;
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}
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sub trace_end
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{
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printf("wakeup_latency stats:\n\n");
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print "total_wakeups: $total_wakeups\n";
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if ($total_wakeups) {
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printf("avg_wakeup_latency (ns): %u\n",
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avg($total_wakeup_latency, $total_wakeups));
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} else {
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printf("avg_wakeup_latency (ns): N/A\n");
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}
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printf("min_wakeup_latency (ns): %u\n", $min_wakeup_latency);
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printf("max_wakeup_latency (ns): %u\n", $max_wakeup_latency);
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print_unhandled();
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}
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my %unhandled;
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sub print_unhandled
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{
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if ((scalar keys %unhandled) == 0) {
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return;
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}
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print "\nunhandled events:\n\n";
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printf("%-40s %10s\n", "event", "count");
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printf("%-40s %10s\n", "----------------------------------------",
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"-----------");
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foreach my $event_name (keys %unhandled) {
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printf("%-40s %10d\n", $event_name, $unhandled{$event_name});
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}
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}
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sub trace_unhandled
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm) = @_;
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$unhandled{$event_name}++;
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}
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