Howard Chu 77e11efedb perf test trace: Use --sort-events in BTF general tests ... Without the '--sort-events' flag, perf trace doesn't receive and process events based on their arrival time, thus PERF_RECORD_COMM event that assigns the correct comm to a PID, may be delivered and processed after regular samples, causing trace outputs not having a 'comm', e.g. 'mv', instead, having the default PID placeholder, e.g. ':14514'. Hopefully this answers Namhyung's question in [1]. You can simply justify the statement with this diff: [2]. Now, simply run this command multiple times: $ touch /tmp/file1 && sudo /tmp/perf trace -e renameat* -- mv /tmp/file1 /tmp/file2 && rm -f /tmp/file2 And you should see two types of results: $ touch /tmp/file1 && sudo /tmp/perf trace -e renameat* -- mv /tmp/file1 /tmp/file2 && rm -f /tmp/file2 [debug] deliver [debug] machine__process_comm_event [OVERRIDE] old :1221169 new mv str mv [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver 0.000 ( 0.013 ms): mv/1221169 renameat2(olddfd: CWD, oldname: "/tmp/file1", newdfd: CWD, newname: "/tmp/file2", flags: NOREPLACE) = 0 [debug] deliver $ touch /tmp/file1 && sudo /tmp/perf trace -e renameat* -- mv /tmp/file1 /tmp/file2 && rm -f /tmp/file2 [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver [debug] deliver 0.000 ( 0.014 ms): :1221398/1221398 renameat2(olddfd: CWD, oldname: "/tmp/file1", newdfd: CWD, newname: "/tmp/file2", flags: NOREPLACE) = 0 [debug] deliver [debug] deliver [debug] machine__process_comm_event [OVERRIDE] old :1221398 new mv str mv [debug] deliver [debug] deliver [debug] deliver Anyway, use --sort-events in BTF general tests to avoid :PID, a comm is preferred. [1]: https://lore.kernel.org/linux-perf-users/Z_AeswETE5xLcPT8@google.com/ [2]: 529667bd74/unsorted.patch Signed-off-by: Howard Chu <howardchu95@gmail.com> Tested-by: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20250528191148.89118-6-howardchu95@gmail.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>		2025-06-09 11:18:20 -07:00
..
accounting
arch	perf tools improvements and fixes for Linux v6.16:	2025-06-03 15:11:44 -07:00
bootconfig	tools/bootconfig: specify LDFLAGS as an argument to CC	2025-05-16 11:22:54 +09:00
bpf	bpftool: Add support for custom BTF path in prog load/loadall	2025-05-27 10:31:20 -07:00
build	tools/build: Remove some unused libbpf pre-1.0 feature test logic	2025-06-09 11:18:19 -07:00
certs
cgroup
counter
crypto
debugging
firewire
firmware
gpio
hv	tools: hv: Enable debug logs for hv_kvp_daemon	2025-05-23 16:30:55 +00:00
iio	iio: normalize array sentinel style	2025-04-22 19:10:04 +01:00
include	Including fixes from CAN, wireless, Bluetooth, and Netfilter.	2025-06-05 12:34:55 -07:00
kvm/kvm_stat
laptop
leds
lib	perf tools improvements and fixes for Linux v6.16:	2025-06-03 15:11:44 -07:00
memory-model	tools/memory-model/Documentation: Fix SRCU section in explanation.txt	2025-04-23 12:17:04 -07:00
mm
net	Networking changes for 6.16.	2025-05-28 15:24:36 -07:00
objtool	Rust changes for v6.16	2025-06-04 21:18:37 -07:00
pcmcia
perf	perf test trace: Use --sort-events in BTF general tests	2025-06-09 11:18:20 -07:00
power	turbostat v2025.06.08	2025-06-08 11:44:41 -07:00
rcu
sched_ext	sched_ext: change the variable name for slice refill event	2025-04-18 17:25:39 -10:00
scripts
sound
spi
testing	mount-related bugfixes	2025-06-08 10:35:12 -07:00
thermal
time
tracing	tracing tools updates for v6.16:	2025-05-29 20:59:52 -07:00
usb
verification
virtio
wmi
workqueue
writeback
Makefile	tools/Makefile: Add ynl target	2025-04-28 17:18:48 -07:00