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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/tools/perf/Documentation/perf-trace.txt
....@@ -42,6 +42,11 @@
4242 	Prefixing with ! shows all syscalls but the ones specified.  You may
4343 	need to escape it.
4444 
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+--filter=<filter>::
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+        Event filter. This option should follow an event selector (-e) which
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+	selects tracepoint event(s).
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+
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+
4550 -D msecs::
4651 --delay msecs::
4752 After starting the program, wait msecs before measuring. This is useful to
....@@ -141,6 +146,10 @@
141146 	Show all syscalls followed by a summary by thread with min, max, and
142147     average times (in msec) and relative stddev.
143148 
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+--errno-summary::
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+	To be used with -s or -S, to show stats for the errnos experienced by
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+	syscalls, using only this option will trigger --summary.
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+
144153 --tool_stats::
145154 	Show tool stats such as number of times fd->pathname was discovered thru
146155 	hooking the open syscall return + vfs_getname or via reading /proc/pid/fd, etc.
....@@ -171,6 +180,20 @@
171180 --kernel-syscall-graph::
172181 	 Show the kernel callchains on the syscall exit path.
173182 
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+--max-events=N::
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+	Stop after processing N events. Note that strace-like events are considered
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+	only at exit time or when a syscall is interrupted, i.e. in those cases this
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+	option is equivalent to the number of lines printed.
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+
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+--switch-on EVENT_NAME::
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+	Only consider events after this event is found.
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+
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+--switch-off EVENT_NAME::
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+	Stop considering events after this event is found.
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+
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+--show-on-off-events::
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+	Show the --switch-on/off events too.
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+
174197 --max-stack::
175198         Set the stack depth limit when parsing the callchain, anything
176199         beyond the specified depth will be ignored. Note that at this point
....@@ -199,6 +222,25 @@
199222 	When processing pre-existing threads /proc/XXX/mmap, it may take a long time,
200223 	because the file may be huge. A time out is needed in such cases.
201224 	This option sets the time out limit. The default value is 500 ms.
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+
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+--sort-events::
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+	Do sorting on batches of events, use when noticing out of order events that
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+	may happen, for instance, when a thread gets migrated to a different CPU
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+	while processing a syscall.
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+
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+--libtraceevent_print::
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+	Use libtraceevent to print tracepoint arguments. By default 'perf trace' uses
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+	the same beautifiers used in the strace-like enter+exit lines to augment the
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+	tracepoint arguments.
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+
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+--map-dump::
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+	Dump BPF maps setup by events passed via -e, for instance the augmented_raw_syscalls
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+	living in tools/perf/examples/bpf/augmented_raw_syscalls.c. For now this
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+	dumps just boolean map values and integer keys, in time this will print in hex
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+	by default and use BTF when available, as well as use functions to do pretty
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+	printing using the existing 'perf trace' syscall arg beautifiers to map integer
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+	arguments to strings (pid to comm, syscall id to syscall name, etc).
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+
202244 
203245 PAGEFAULTS
204246 ----------
....@@ -238,6 +280,68 @@
238280   As you can see, there was major pagefault in python process, from
239281   CRYPTO_push_info_ routine which faulted somewhere in libcrypto.so.
240282 
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+Trace the first 4 open, openat or open_by_handle_at syscalls (in the future more syscalls may match here):
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+
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+  $ perf trace -e open* --max-events 4
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+  [root@jouet perf]# trace -e open* --max-events 4
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+  2272.992 ( 0.037 ms): gnome-shell/1370 openat(dfd: CWD, filename: /proc/self/stat) = 31
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+  2277.481 ( 0.139 ms): gnome-shell/3039 openat(dfd: CWD, filename: /proc/self/stat) = 65
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+  3026.398 ( 0.076 ms): gnome-shell/3039 openat(dfd: CWD, filename: /proc/self/stat) = 65
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+  4294.665 ( 0.015 ms): sed/15879 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) = 3
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+  $
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+
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+Trace the first minor page fault when running a workload:
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+
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+  # perf trace -F min --max-stack=7 --max-events 1 sleep 1
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+     0.000 ( 0.000 ms): sleep/18006 minfault [__clear_user+0x1a] => 0x5626efa56080 (?k)
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+                                       __clear_user ([kernel.kallsyms])
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+                                       load_elf_binary ([kernel.kallsyms])
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+                                       search_binary_handler ([kernel.kallsyms])
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+                                       __do_execve_file.isra.33 ([kernel.kallsyms])
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+                                       __x64_sys_execve ([kernel.kallsyms])
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+                                       do_syscall_64 ([kernel.kallsyms])
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+                                       entry_SYSCALL_64 ([kernel.kallsyms])
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+  #
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+
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+Trace the next min page page fault to take place on the first CPU:
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+
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+  # perf trace -F min --call-graph=dwarf --max-events 1 --cpu 0
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+     0.000 ( 0.000 ms): Web Content/17136 minfault [js::gc::Chunk::fetchNextDecommittedArena+0x4b] => 0x7fbe6181b000 (?.)
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+                                       js::gc::FreeSpan::initAsEmpty (inlined)
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+                                       js::gc::Arena::setAsNotAllocated (inlined)
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+                                       js::gc::Chunk::fetchNextDecommittedArena (/usr/lib64/firefox/libxul.so)
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+                                       js::gc::Chunk::allocateArena (/usr/lib64/firefox/libxul.so)
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+                                       js::gc::GCRuntime::allocateArena (/usr/lib64/firefox/libxul.so)
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+                                       js::gc::ArenaLists::allocateFromArena (/usr/lib64/firefox/libxul.so)
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+                                       js::gc::GCRuntime::tryNewTenuredThing<JSString, (js::AllowGC)1> (inlined)
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+                                       js::AllocateString<JSString, (js::AllowGC)1> (/usr/lib64/firefox/libxul.so)
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+                                       js::Allocate<JSThinInlineString, (js::AllowGC)1> (inlined)
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+                                       JSThinInlineString::new_<(js::AllowGC)1> (inlined)
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+                                       AllocateInlineString<(js::AllowGC)1, unsigned char> (inlined)
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+                                       js::ConcatStrings<(js::AllowGC)1> (/usr/lib64/firefox/libxul.so)
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+                                       [0x18b26e6bc2bd] (/tmp/perf-17136.map)
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+  #
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+
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+Trace the next two sched:sched_switch events, four block:*_plug events, the
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+next block:*_unplug and the next three net:*dev_queue events, this last one
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+with a backtrace of at most 16 entries, system wide:
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+
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+  # perf trace -e sched:*switch/nr=2/,block:*_plug/nr=4/,block:*_unplug/nr=1/,net:*dev_queue/nr=3,max-stack=16/
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+     0.000 :0/0 sched:sched_switch:swapper/2:0 [120] S ==> rcu_sched:10 [120]
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+     0.015 rcu_sched/10 sched:sched_switch:rcu_sched:10 [120] R ==> swapper/2:0 [120]
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+   254.198 irq/50-iwlwifi/680 net:net_dev_queue:dev=wlp3s0 skbaddr=0xffff93498051f600 len=66
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+                                       __dev_queue_xmit ([kernel.kallsyms])
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+   273.977 :0/0 net:net_dev_queue:dev=wlp3s0 skbaddr=0xffff93498051f600 len=78
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+                                       __dev_queue_xmit ([kernel.kallsyms])
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+   274.007 :0/0 net:net_dev_queue:dev=wlp3s0 skbaddr=0xffff93498051ff00 len=78
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+                                       __dev_queue_xmit ([kernel.kallsyms])
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+  2930.140 kworker/u16:58/2722 block:block_plug:[kworker/u16:58]
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+  2930.162 kworker/u16:58/2722 block:block_unplug:[kworker/u16:58] 1
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+  4466.094 jbd2/dm-2-8/748 block:block_plug:[jbd2/dm-2-8]
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+  8050.123 kworker/u16:30/2694 block:block_plug:[kworker/u16:30]
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+  8050.271 kworker/u16:30/2694 block:block_plug:[kworker/u16:30]
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+  #
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+
241345 SEE ALSO
242346 --------
243347 linkperf:perf-record[1], linkperf:perf-script[1]