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auditbt.meta
429
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auditbt.stp
622
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auditbt.tcl
79
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chng_cpu.meta
775
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chng_cpu.stp
1.02
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chng_cpu.tcl
140
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cycle_thief.meta
1.06
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cycle_thief.stp
2.83
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cycle_thief.txt
5.83
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errsnoop.meta
575
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errsnoop.stp
1015
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forktracker.meta
525
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forktracker.stp
601
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futexes.meta
520
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futexes.stp
1.09
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futexes.txt
944
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futexes2.meta
593
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futexes2.stp
1.97
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ltrace.meta
314
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ltrace.stp
2.94
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ltrace.tcl
122
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migrate.meta
746
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migrate.stp
1.01
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mutex-contention.meta
479
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mutex-contention.stp
5.43
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mutex-contention.tcl
79
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noptrace.meta
512
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noptrace.stp
1.98
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noptrace.txt
1.18
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pfiles.meta
450
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pfiles.stp
23.14
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plimit.meta
387
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plimit.stp
2.96
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proc_snoop.stp
1.11
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proc_snoop_parser.xml
818
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proc_snoop_parser_instructions...
2.13
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procmod_watcher.meta
657
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procmod_watcher.stp
2.35
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proctop.meta
601
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proctop.stp
4.15
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proctop.txt
8.45
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psig.meta
354
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psig.stp
5.48
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pstrace_exec.meta
545
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pstrace_exec.stp
465
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pstree.meta
455
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pstree.stp
1.91
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rlimit_nofile.meta
319
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rlimit_nofile.stp
1.12
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sched-latency.meta
470
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sched-latency.stp
508
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sched-latency.txt
1.53
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schedtimes.meta
814
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schedtimes.stp
3.84
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schedtimes.txt
3.2
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semop-watch.meta
267
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semop-watch.stp
795
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sig_by_pid.meta
357
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sig_by_pid.stp
1.04
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sig_by_pid.txt
1.48
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sig_by_proc.meta
364
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sig_by_proc.stp
839
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sig_by_proc.txt
951
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sigkill.meta
560
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sigkill.stp
656
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sigmon.meta
669
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sigmon.stp
932
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sleepingBeauties.meta
581
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sleepingBeauties.stp
1.33
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sleepingBeauties.tcl
140
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sleeptime.meta
601
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sleeptime.stp
1.2
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spawn_seeker.meta
854
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spawn_seeker.stp
1.49
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spawn_seeker.txt
1.29
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strace.meta
385
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strace.stp
2.03
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strace.txt
3.59
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syscalls_by_pid.meta
514
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syscalls_by_pid.stp
623
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syscalls_by_pid.txt
597
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syscalls_by_proc.meta
531
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syscalls_by_proc.stp
677
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syscalls_by_proc.txt
1.1
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syscalltimes
6.14
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syscalltimes.meta
454
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syscalltimes.txt
11.19
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thread-business.meta
346
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thread-business.stp
866
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thread-business.txt
2.76
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threadstacks.meta
585
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threadstacks.stp
1.43
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threadstacks.tcl
79
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wait4time.meta
658
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wait4time.stp
1.32
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Code Editor : futexes2.stp
#!/usr/bin/stap # This script tries to identify contended user-space locks by hooking # into the futex system call. /* Bits indicating sharing in futex_key.both.offset */ global FUT_OFF_INODE = 1 /* We set bit 0 if key has a reference on inode */ global FUT_OFF_MMSHARED = 2 /* We set bit 1 if key has a reference on mm */ global FUTEX_WAIT = 0 /*, FUTEX_WAKE = 1 */ global FUTEX_PRIVATE_FLAG = 128 /* linux 2.6.22+ */ global FUTEX_CLOCK_REALTIME = 256 /* linux 2.6.29+ */ global wait_keys # per-thread key strings for waiting futexes global lock_waits # long-lived stats on (tid,lock) blockage elapsed time global process_names # long-lived pid-to-execname mapping @define KEY %( @cast(key, "union futex_key") %) probe kernel.function("futex_wait_setup").return { if ($return != 0) next key = @entry(&$q->key) offset = @KEY->both->offset masked_offset = offset & ~(FUT_OFF_INODE | FUT_OFF_MMSHARED) if (offset & FUT_OFF_INODE) { address = @KEY->shared->pgoff * mem_page_size() + masked_offset path = inode_path(@KEY->shared->inode) wait_keys[tid()] = sprintf("INODE:%s+%p", path, address) } else if (offset & FUT_OFF_MMSHARED) { address = @KEY->private->address + masked_offset wait_keys[tid()] = sprintf("MMSHARED:%p", address) } } global entry_times% probe syscall.futex { if ((op & ~(FUTEX_PRIVATE_FLAG|FUTEX_CLOCK_REALTIME)) != FUTEX_WAIT) next entry_times[tid()] = gettimeofday_us() } probe syscall.futex.return { if (!(tid() in wait_keys)) next key = wait_keys[tid()] delete wait_keys[tid()] if (!(tid() in entry_times)) next elapsed = gettimeofday_us() - entry_times[tid()] lock_waits[pid(), key] <<< elapsed delete entry_times[tid()] if (!(pid() in process_names)) process_names[pid()] = execname() } probe end { foreach ([pid+, lock] in lock_waits) printf ("%s[%d] lock %s contended %d times, %d avg us\n", process_names[pid], pid, lock, @count(lock_waits[pid,lock]), @avg(lock_waits[pid,lock])) }
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