1perf-trace(1) 2============= 3 4NAME 5---- 6perf-trace - strace inspired tool 7 8SYNOPSIS 9-------- 10[verse] 11'perf trace' 12'perf trace record' 13 14DESCRIPTION 15----------- 16This command will show the events associated with the target, initially 17syscalls, but other system events like pagefaults, task lifetime events, 18scheduling events, etc. 19 20This is a live mode tool in addition to working with perf.data files like 21the other perf tools. Files can be generated using the 'perf record' command 22but the session needs to include the raw_syscalls events (-e 'raw_syscalls:*'). 23Alernatively, the 'perf trace record' can be used as a shortcut to 24automatically include the raw_syscalls events when writing events to a file. 25 26The following options apply to perf trace; options to perf trace record are 27found in the perf record man page. 28 29OPTIONS 30------- 31 32-a:: 33--all-cpus:: 34 System-wide collection from all CPUs. 35 36-e:: 37--expr:: 38 List of events to show, currently only syscall names. 39 Prefixing with ! shows all syscalls but the ones specified. You may 40 need to escape it. 41 42-o:: 43--output=:: 44 Output file name. 45 46-p:: 47--pid=:: 48 Record events on existing process ID (comma separated list). 49 50-t:: 51--tid=:: 52 Record events on existing thread ID (comma separated list). 53 54-u:: 55--uid=:: 56 Record events in threads owned by uid. Name or number. 57 58-v:: 59--verbose=:: 60 Verbosity level. 61 62-i:: 63--no-inherit:: 64 Child tasks do not inherit counters. 65 66-m:: 67--mmap-pages=:: 68 Number of mmap data pages (must be a power of two) or size 69 specification with appended unit character - B/K/M/G. The 70 size is rounded up to have nearest pages power of two value. 71 72-C:: 73--cpu:: 74Collect samples only on the list of CPUs provided. Multiple CPUs can be provided as a 75comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. 76In per-thread mode with inheritance mode on (default), Events are captured only when 77the thread executes on the designated CPUs. Default is to monitor all CPUs. 78 79--duration: 80 Show only events that had a duration greater than N.M ms. 81 82--sched: 83 Accrue thread runtime and provide a summary at the end of the session. 84 85-i 86--input 87 Process events from a given perf data file. 88 89-T 90--time 91 Print full timestamp rather time relative to first sample. 92 93--comm:: 94 Show process COMM right beside its ID, on by default, disable with --no-comm. 95 96--summary:: 97 Show a summary of syscalls by thread with min, max, and average times (in 98 msec) and relative stddev. 99 100--tool_stats:: 101 Show tool stats such as number of times fd->pathname was discovered thru 102 hooking the open syscall return + vfs_getname or via reading /proc/pid/fd, etc. 103 104SEE ALSO 105-------- 106linkperf:perf-record[1], linkperf:perf-script[1] 107