Hey all, because many people only have a pretty outdated perf userspace toolsuite available, I would like to package a recent version of perf into an AppImage. My current .travis.yml can be found at [1], the result is available from [2], e.g. [3].
[1]: https://github.com/milianw/linux/blob/wip/perf-appimage/.travis.yml [2]: https://travis-ci.org/milianw/linux/ [3]: https://transfer.sh/IX3zr/perf-git.5b330557-x86_64.AppImage This was build on a Ubuntu 14.04 VM using Travis CI. All libs that got bundled are those available on that system, except for elfutils - for that I used a custom build of the newer 0.170 release. So far so good, this actually seems to work for most purposes I've tried so far. What's missing is proper `man` integration, I'll try to look into this. But one issue that I've found which is puzzling me is the following: perf stat does not work when filtering on an application. I.e. when I use the system wide mode, it works fine: ~~~~~ $ ./perf-git.3a73b7f9-x86_64.AppImage stat ^C Performance counter stats for 'system wide': 4510.197963 cpu-clock (msec) # 3.998 CPUs utilized 205 context-switches # 0.045 K/sec 3 cpu-migrations # 0.001 K/sec 0 page-faults # 0.000 K/sec 16,396,597 cycles # 0.004 GHz 13,065,398 stalled-cycles-frontend # 79.68% frontend cycles idle 11,340,112 stalled-cycles-backend # 69.16% backend cycles idle 5,718,881 instructions # 0.35 insn per cycle # 2.28 stalled cycles per insn 1,197,336 branches # 0.265 M/sec 101,136 branch-misses # 8.45% of all branches 1.128056669 seconds time elapsed ~~~~~ But when I launch an application most counters are empty: ~~~~~ $ ./perf-git.3a73b7f9-x86_64.AppImage stat sleep 1 Performance counter stats for 'sleep 1': <not counted> task-clock <not counted> context-switches <not counted> cpu-migrations <not counted> page-faults <not counted> cycles <not counted> stalled-cycles-frontend <not counted> stalled-cycles-backend 68,696 instructions 13,573 branches # 0.000 K/sec 1,410 branch-misses # 10.39% of all branches 0.000023100 seconds time elapsed ~~~~~ Also note how this did _not_ sleep for one second but rather quit sooner than that?! Stracing (as root, due to AppImage), shows the following issue: ~~~~~ $ sudo strace -f -e fork,execve -s 1000 ./perf-git.3a73b7f9-x86_64.AppImage stat sleep 1 execve("./perf-git.3a73b7f9-x86_64.AppImage", ["./perf-git.3a73b7f9- x86_64.AppImage", "stat", "sleep", "1"], 0x7ffea0ec02d0 /* 18 vars */) = 0 strace: Process 21593 attached strace: Process 21595 attached [pid 21593] +++ exited with 0 +++ [pid 21592] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21593, si_uid=0, si_status=0, si_utime=0, si_stime=0} --- strace: Process 21596 attached [pid 21592] execve("/tmp/.mount_perf-ggA4YJW/AppRun", ["./perf-git.3a73b7f9- x86_64.AppImage", "stat", "sleep", "1"], 0x1ce1b70 /* 21 vars */) = 0 strace: Process 21597 attached [pid 21597] execve("/usr/libexec/perf-core/sleep", ["sleep", "1"], 0x3075650 / * 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/tmp/./sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/home/milian/.bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/usr/lib/icecream/libexec/icecc/bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/ssd2/milian/projects/compiled/other/bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/home/milian/.bin/kf5/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/ssd2/milian/projects/compiled/kf5/bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/home/milian/projects/compiled/other/bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/home/milian/projects/compiled/kf5/bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/usr/local/sbin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/usr/local/bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */) = -1 ENOENT (No such file or directory) [pid 21597] execve("/usr/bin/sleep", ["sleep", "1"], 0x3075650 /* 22 vars */ Performance counter stats for 'sleep 1': <not counted> task-clock <not counted> context-switches <not counted> ) = 0 cpu-migrations <not counted> page-faults <not counted> cycles <not counted> instructions <not counted> branches <not counted> branch-misses 0.000033074 seconds time elapsed Some events weren't counted. Try disabling the NMI watchdog: echo 0 > /proc/sys/kernel/nmi_watchdog perf stat ... echo 1 > /proc/sys/kernel/nmi_watchdog [pid 21597] --- SIGTERM {si_signo=SIGTERM, si_code=SI_USER, si_pid=21592, si_uid=0} --- [pid 21597] +++ killed by SIGTERM +++ [pid 21592] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=21597, si_uid=0, si_status=SIGTERM, si_utime=0, si_stime=0} --- [pid 21596] --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=21595, si_uid=0} --- [pid 21592] +++ exited with 0 +++ [pid 21595] --- SIGHUP {si_signo=SIGHUP, si_code=SI_USER, si_pid=21595, si_uid=0} --- [pid 21596] +++ exited with 0 +++ +++ exited with 0 +++ ~~~~~ I couldn't yet find a way to get a backtrace to the SIGTERM. I also wonder why I don't see any error message anywhere... To make this even more confusing, extracting to AppImage (it's essentially a squashfs image that gets loop-mounted via fuse), things start to work again...: ~~~~~ $ ./perf-git.3a73b7f9-x86_64.AppImage --appimage-extract .. $ ./squashfs-root/AppRun stat sleep 1 Performance counter stats for 'sleep 1': 0.559792 task-clock (msec) # 0.001 CPUs utilized 1 context-switches # 0.002 M/sec 0 cpu-migrations # 0.000 K/sec 60 page-faults # 0.107 M/sec 922,471 cycles # 1.648 GHz 564,261 stalled-cycles-frontend # 61.17% frontend cycles idle 441,173 stalled-cycles-backend # 47.83% backend cycles idle 743,424 instructions # 0.81 insn per cycle # 0.76 stalled cycles per insn 145,166 branches # 259.321 M/sec 7,726 branch-misses # 5.32% of all branches 1.001073810 seconds time elapsed ~~~~~~ So clearly, it has something to do with the FUSE mounting / AppImage... But has anyone a clue what could be going on here exactly? Any suggestions for what to try in order to debug this? Thanks -- Milian Wolff | milian.wo...@kdab.com | Senior Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts
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