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Message-ID: <aAkTFyihA9bwBx6V@x1>
Date: Wed, 23 Apr 2025 13:19:35 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Howard Chu <howardchu95@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
Kan Liang <kan.liang@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
linux-perf-users@...r.kernel.org, Song Liu <song@...nel.org>,
bpf@...r.kernel.org
Subject: Re: [PATCH v4 1/2] perf trace: Implement syscall summary in BPF
On Fri, Mar 28, 2025 at 06:46:36PM -0700, Howard Chu wrote:
> Hello Namhyung,
>
> On Tue, Mar 25, 2025 at 9:40 PM Namhyung Kim <namhyung@...nel.org> wrote:
> >
> > When -s/--summary option is used, it doesn't need (augmented) arguments
> > of syscalls. Let's skip the augmentation and load another small BPF
> > program to collect the statistics in the kernel instead of copying the
> > data to the ring-buffer to calculate the stats in userspace. This will
> > be much more light-weight than the existing approach and remove any lost
> > events.
> >
> > Let's add a new option --bpf-summary to control this behavior. I cannot
> > make it default because there's no way to get e_machine in the BPF which
> > is needed for detecting different ABIs like 32-bit compat mode.
> >
> > No functional changes intended except for no more LOST events. :)
> >
> > $ sudo ./perf trace -as --summary-mode=total --bpf-summary sleep 1
> >
> > Summary of events:
> >
> > total, 6194 events
> >
> > syscall calls errors total min avg max stddev
> > (msec) (msec) (msec) (msec) (%)
> > --------------- -------- ------ -------- --------- --------- --------- ------
> > epoll_wait 561 0 4530.843 0.000 8.076 520.941 18.75%
> > futex 693 45 4317.231 0.000 6.230 500.077 21.98%
> > poll 300 0 1040.109 0.000 3.467 120.928 17.02%
> > clock_nanosleep 1 0 1000.172 1000.172 1000.172 1000.172 0.00%
> > ppoll 360 0 872.386 0.001 2.423 253.275 41.91%
> > epoll_pwait 14 0 384.349 0.001 27.453 380.002 98.79%
> > pselect6 14 0 108.130 7.198 7.724 8.206 0.85%
> > nanosleep 39 0 43.378 0.069 1.112 10.084 44.23%
> > ...
> >
> > Cc: Howard Chu <howardchu95@...il.com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> > v4)
> > * fix segfault on -S (Howard)
> > * correct some comments (Howard)
>
> + if (!hashmap__find(hash, map_key->nr, &data)) {
>
> I think you should mention the hashmap's map_key->nr update, as this
> change is actually important for the feature.
>
> >
> > v3)
> > * support -S/--with-summary option too (Howard)
> > * make it work only with -a/--all-cpus (Howard)
> > * fix stddev calculation (Howard)
> > * add some comments about syscall_data (Howard)
> >
> > v2)
> > * Rebased on top of Ian's e_machine changes
> > * add --bpf-summary option
> > * support per-thread summary
> > * add stddev calculation (Howard)
> >
> > tools/perf/Documentation/perf-trace.txt | 6 +
> > tools/perf/Makefile.perf | 2 +-
> > tools/perf/builtin-trace.c | 54 ++-
> > tools/perf/util/Build | 1 +
> > tools/perf/util/bpf-trace-summary.c | 347 ++++++++++++++++++
> > .../perf/util/bpf_skel/syscall_summary.bpf.c | 118 ++++++
> > tools/perf/util/bpf_skel/syscall_summary.h | 25 ++
> > tools/perf/util/trace.h | 37 ++
> > 8 files changed, 577 insertions(+), 13 deletions(-)
> > create mode 100644 tools/perf/util/bpf-trace-summary.c
> > create mode 100644 tools/perf/util/bpf_skel/syscall_summary.bpf.c
> > create mode 100644 tools/perf/util/bpf_skel/syscall_summary.h
> > create mode 100644 tools/perf/util/trace.h
> >
> > diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
> > index 887dc37773d0f4d6..a8a0d8c33438fef7 100644
> > --- a/tools/perf/Documentation/perf-trace.txt
> > +++ b/tools/perf/Documentation/perf-trace.txt
> > @@ -251,6 +251,12 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
> > pretty-printing serves as a fallback to hand-crafted pretty printers, as the latter can
> > better pretty-print integer flags and struct pointers.
> >
> > +--bpf-summary::
> > + Collect system call statistics in BPF. This is only for live mode and
> > + works well with -s/--summary option where no argument information is
> > + required.
root@...ber:~#>
> It works with -S as well, doesn't it?
Yes, I tested it:
root@...ber:~# perf trace -aS --summary-mode=total --bpf-summary sleep 0.000000001
0.011 ( 0.008 ms): :146484/146484 execve(filename: "/home/acme/libexec/perf-core/sleep", argv: 0x7ffcdf2108f0, envp: 0x37fabf70) = -1 ENOENT (No such file or directory)
0.021 ( 0.002 ms): :146484/146484 execve(filename: "/root/.local/bin/sleep", argv: 0x7ffcdf2108f0, envp: 0x37fabf70) = -1 ENOENT (No such file or directory)
0.024 ( 0.002 ms): :146484/146484 execve(filename: "/root/bin/sleep", argv: 0x7ffcdf2108f0, envp: 0x37fabf70) = -1 ENOENT (No such file or directory)
0.026 ( 0.002 ms): :146484/146484 execve(filename: "/usr/local/sbin/sleep", argv: 0x7ffcdf2108f0, envp: 0x37fabf70) = -1 ENOENT (No such file or directory)
0.029 ( 0.001 ms): :146484/146484 execve(filename: "/usr/local/bin/sleep", argv: 0x7ffcdf2108f0, envp: 0x37fabf70) = -1 ENOENT (No such file or directory)
? ( ): sudo/115804 ... [continued]: ppoll()) = 1
0.032 ( ): :146484/146484 execve(filename: "/usr/sbin/sleep", argv: 0x7ffcdf2108f0, envp: 0x37fabf70) ...
0.146 ( 0.002 ms): sudo/115804 rt_sigaction(sig: TTIN, act: (struct sigaction){.sa_handler = (__sighandler_t)0x557bdbdec4c0,.sa_flags = (long unsigned int)67108864,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, oact: 0x7ffff79f7d80, sigsetsize: 8) = 0
0.150 ( 0.003 ms): sudo/115804 read(fd: 9</dev/ptmx>, buf: 0x557be6008260, count: 65536) = 297
0.155 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTIN, act: (struct sigaction){.sa_handler = (__sighandler_t)0x1,.sa_flags = (long unsigned int)335544320,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, sigsetsize: 8) = 0
0.158 ( 0.001 ms): sudo/115804 rt_sigprocmask(nset: 0x557bdbe1a6a0, oset: 0x7ffff79f7d70, sigsetsize: 8) = 0
0.162 ( 0.001 ms): sudo/115804 rt_sigprocmask(how: SETMASK, nset: 0x7ffff79f7d70, sigsetsize: 8) = 0
0.165 ( 0.002 ms): sudo/115804 ppoll(ufds: 0x557be5f955b0, nfds: 5, sigsetsize: 8) = 2
0.169 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTIN, act: (struct sigaction){.sa_handler = (__sighandler_t)0x557bdbdec4c0,.sa_flags = (long unsigned int)67108864,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, oact: 0x7ffff79f7d80, sigsetsize: 8) = 0
0.171 ( 0.002 ms): sudo/115804 read(fd: 9</dev/ptmx>, buf: 0x557be6008389, count: 65239) = 502
0.175 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTIN, act: (struct sigaction){.sa_handler = (__sighandler_t)0x1,.sa_flags = (long unsigned int)335544320,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, sigsetsize: 8) = 0
0.177 ( 0.001 ms): sudo/115804 rt_sigprocmask(nset: 0x557bdbe1a6a0, oset: 0x7ffff79f7d70, sigsetsize: 8) = 0
0.179 ( 0.001 ms): sudo/115804 rt_sigprocmask(how: SETMASK, nset: 0x7ffff79f7d70, sigsetsize: 8) = 0
0.181 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTOU, act: (struct sigaction){.sa_handler = (__sighandler_t)0x557bdbdec4d0,.sa_flags = (long unsigned int)67108864,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, oact: 0x7ffff79f7d80, sigsetsize: 8) = 0
0.183 ( 0.004 ms): sudo/115804 write(fd: 8</dev/tty>, buf: ? ( ): :146484/, count: 799) = 799
0.189 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTOU, act: (struct sigaction){.sa_handler = (__sighandler_t)0x1,.sa_flags = (long unsigned int)335544320,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, sigsetsize: 8) = 0
0.193 ( 0.002 ms): sudo/115804 ppoll(ufds: 0x557be5f955b0, nfds: 4, sigsetsize: 8) = 1
0.196 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTIN, act: (struct sigaction){.sa_handler = (__sighandler_t)0x557bdbdec4c0,.sa_flags = (long unsigned int)67108864,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, oact: 0x7ffff79f7d80, sigsetsize: 8) = 0
0.199 ( 0.002 ms): sudo/115804 read(fd: 9</dev/ptmx>, buf: 0x557be6008260, count: 65536) = 379
0.201 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTIN, act: (struct sigaction){.sa_handler = (__sighandler_t)0x1,.sa_flags = (long unsigned int)335544320,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, sigsetsize: 8) = 0
0.203 ( 0.001 ms): sudo/115804 rt_sigprocmask(nset: 0x557bdbe1a6a0, oset: 0x7ffff79f7d70, sigsetsize: 8) = 0
0.205 ( 0.001 ms): sudo/115804 rt_sigprocmask(how: SETMASK, nset: 0x7ffff79f7d70, sigsetsize: 8) = 0
0.206 ( 0.002 ms): sudo/115804 ppoll(ufds: 0x557be5f955b0, nfds: 5, sigsetsize: 8) = 1
0.209 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTOU, act: (struct sigaction){.sa_handler = (__sighandler_t)0x557bdbdec4d0,.sa_flags = (long unsigned int)67108864,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, oact: 0x7ffff79f7d80, sigsetsize: 8) = 0
0.211 ( 0.002 ms): sudo/115804 write(fd: 8</dev/tty>, buf: ): :146484/146484 execve(filenam, count: 379) = 379
0.213 ( 0.001 ms): sudo/115804 rt_sigaction(sig: TTOU, act: (struct sigaction){.sa_handler = (__sighandler_t)0x1,.sa_flags = (long unsigned int)335544320,.sa_restorer = (__sigrestore_t)0x7f50c6627bf0,}, sigsetsize: 8) = 0
? ( ): ptyxis/3622 ... [continued]: ppoll()) = 1
0.215 ( ): sudo/115804 ppoll(ufds: 0x557be5f955b0, nfds: 4, sigsetsize: 8) ...
0.196 ( 0.002 ms): ptyxis/3622 write(fd: 4<anon_inode:[eventfd]>, buf: \1\0\0\0\0\0\0\0, count: 8) = 8
0.206 ( 0.003 ms): ptyxis/3622 read(fd: 41</dev/ptmx>, buf: 0x5586a84ee428, count: 8136) = 800
0.209 ( 0.001 ms): ptyxis/3622 read(fd: 41</dev/ptmx>, buf: 0x5586a84ee747, count: 7337) = -1 EAGAIN (Resource temporarily unavailable)
0.221 ( 0.001 ms): ptyxis/3622 write(fd: 4<anon_inode:[eventfd]>, buf: \1\0\0\0\0\0\0\0, count: 8) = 8
0.224 ( 0.002 ms): ptyxis/3622 ppoll(ufds: 0x5586a7e8f120, nfds: 10, tsp: 0x7ffdd1fbb470, sigsetsize: 8) = 2
0.227 ( 0.001 ms): ptyxis/3622 read(fd: 4<anon_inode:[eventfd]>, buf: 0x7ffdd1fbb3a0, count: 8) = 8
0.229 ( 0.001 ms): ptyxis/3622 write(fd: 4<anon_inode:[eventfd]>, buf: \1\0\0\0\0\0\0\0, count: 8) = 8
0.231 ( 0.001 ms): ptyxis/3622 read(fd: 41</dev/ptmx>, buf: 0x5586a84ee747, count: 7337) = 380
0.233 ( 0.001 ms): ptyxis/3622 read(fd: 41</dev/ptmx>, buf: 0x5586a84ee8c2, count: 6958) = -1 EAGAIN (Resource temporarily unavailable)
0.234 ( 0.001 ms): ptyxis/3622 write(fd: 4<anon_inode:[eventfd]>, buf: \1\0\0\0\0\0\0\0, count: 8) = 8
0.236 ( 0.001 ms): ptyxis/3622 ppoll(ufds: 0x5586a7e8f120, nfds: 10, tsp: 0x7ffdd1fbb470, sigsetsize: 8) = 1
0.238 ( 0.001 ms): ptyxis/3622 read(fd: 4<anon_inode:[eventfd]>, buf: 0x7ffdd1fbb3a0, count: 8) = 8
? ( ): mdns_service/5565 ... [continued]: recvfrom()) = -1 EAGAIN (Resource temporarily unavailable)
0.241 ( ): ptyxis/3622 ppoll(ufds: 0x5586a7e8f120, nfds: 10, tsp: 0x7ffdd1fbb470, sigsetsize: 8) ...
0.032 ( 0.627 ms): sleep/146484 ... [continued]: execve()) = 0
1.059 ( ): mdns_service/5565 recvfrom(fd: 292<socket:[81029]>, ubuf: 0x7f6cfdc454c0, size: 9000, addr: 0x7f6cfdc47b00, addr_len: 0x7f6cfdc47a00) ...
0.676 ( 0.001 ms): sleep/146484 brk() = 0x56443e2d4000
0.689 ( 0.002 ms): sleep/146484 mmap(len: 8192, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS) = 0x7fe66d41d000
0.693 ( 0.002 ms): sleep/146484 access(filename: "/etc/ld.so.preload", mode: R) = -1 ENOENT (No such file or directory)
0.698 ( 0.002 ms): sleep/146484 openat(dfd: CWD, filename: "/etc/ld.so.cache", flags: RDONLY|CLOEXEC) = 3
0.701 ( 0.001 ms): sleep/146484 fstat(fd: 3, statbuf: 0x7ffefb498350) = 0
0.704 ( 0.003 ms): sleep/146484 mmap(len: 76091, prot: READ, flags: PRIVATE, fd: 3) = 0x7fe66d40a000
0.708 ( 0.001 ms): sleep/146484 close(fd: 3) = 0
0.712 ( 0.002 ms): sleep/146484 openat(dfd: CWD, filename: "/lib64/libc.so.6", flags: RDONLY|CLOEXEC) = 3
0.715 ( 0.001 ms): sleep/146484 read(fd: 3, buf: 0x7ffefb4984b8, count: 832) = 832
0.717 ( 0.001 ms): sleep/146484 pread64(fd: 3, buf: 0x7ffefb4980a0, count: 784, pos: 64) = 784
0.719 ( 0.001 ms): sleep/146484 fstat(fd: 3, statbuf: 0x7ffefb498340) = 0
0.722 ( 0.001 ms): sleep/146484 pread64(fd: 3, buf: 0x7ffefb497f80, count: 784, pos: 64) = 784
0.723 ( 0.003 ms): sleep/146484 mmap(len: 2038872, prot: READ|EXEC, flags: PRIVATE|DENYWRITE, fd: 3) = 0x7fe66d218000
0.727 ( 0.004 ms): sleep/146484 mmap(addr: 0x7fe66d387000, len: 479232, prot: READ, flags: PRIVATE|FIXED|DENYWRITE, fd: 3, off: 0x16f000) = 0x7fe66d387000
0.733 ( 0.003 ms): sleep/146484 mmap(addr: 0x7fe66d3fc000, len: 24576, prot: READ|WRITE, flags: PRIVATE|FIXED|DENYWRITE, fd: 3, off: 0x1e3000) = 0x7fe66d3fc000
0.737 ( 0.002 ms): sleep/146484 mmap(addr: 0x7fe66d402000, len: 31832, prot: READ|WRITE, flags: PRIVATE|FIXED|ANONYMOUS) = 0x7fe66d402000
0.743 ( 0.001 ms): sleep/146484 close(fd: 3) = 0
0.748 ( 0.002 ms): sleep/146484 mmap(len: 12288, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS) = 0x7fe66d215000
0.753 ( 0.001 ms): sleep/146484 arch_prctl(option: SET_FS, arg2: 0x7fe66d215740) = 0
0.754 ( 0.001 ms): sleep/146484 set_tid_address(tidptr: 0x7fe66d215a10) = 146484 (sleep)
0.757 ( 0.001 ms): sleep/146484 set_robust_list(head: (struct robust_list_head){.list = (struct robust_list){.next = (struct robust_list *)0x7fe66d215a20,},.futex_offset = (long int)-32,}, len: 24) = 0
0.759 ( 0.001 ms): sleep/146484 rseq(rseq: (struct rseq){.cpu_id = (__u32)4294967295,}, rseq_len: 32, sig: 1392848979) = 0
0.780 ( 0.003 ms): sleep/146484 mprotect(start: 0x7fe66d3fc000, len: 16384, prot: READ) = 0
0.788 ( 0.002 ms): sleep/146484 mprotect(start: 0x564438854000, len: 4096, prot: READ) = 0
0.792 ( 0.002 ms): sleep/146484 mprotect(start: 0x7fe66d459000, len: 8192, prot: READ) = 0
0.798 ( 0.001 ms): sleep/146484 prlimit64(resource: STACK, old_rlim: 0x7ffefb498e90) = 0
0.807 ( 0.003 ms): sleep/146484 munmap(addr: 0x7fe66d40a000, len: 76091) = 0
0.817 ( 0.001 ms): sleep/146484 getrandom(ubuf: 0x7fe66d407218, len: 8, flags: NONBLOCK) = 8
0.819 ( 0.001 ms): sleep/146484 brk() = 0x56443e2d4000
0.821 ( 0.003 ms): sleep/146484 brk(brk: 0x56443e2f5000) = 0x56443e2f5000
0.827 ( 0.032 ms): sleep/146484 openat(dfd: CWD, filename: "", flags: RDONLY|CLOEXEC) = 3
0.860 ( 0.001 ms): sleep/146484 fstat(fd: 3, statbuf: 0x7fe66d401800) = 0
0.862 ( 0.002 ms): sleep/146484 mmap(len: 233242544, prot: READ, flags: PRIVATE, fd: 3) = 0x7fe65f200000
0.867 ( 0.001 ms): sleep/146484 close(fd: 3) = 0
0.888 ( 0.003 ms): sleep/146484 openat(dfd: CWD, filename: "/usr/share/locale/locale.alias", flags: RDONLY|CLOEXEC) = 3
0.892 ( 0.001 ms): sleep/146484 fstat(fd: 3, statbuf: 0x7ffefb498a70) = 0
0.895 ( 0.002 ms): sleep/146484 read(fd: 3, buf: 0x56443e2d5680, count: 4096) = 2998
0.901 ( 0.001 ms): sleep/146484 read(fd: 3, buf: 0x56443e2d5680, count: 4096) = 0
0.903 ( 0.001 ms): sleep/146484 close(fd: 3) = 0
0.909 ( 0.002 ms): sleep/146484 openat(dfd: CWD, filename: "/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo") = -1 ENOENT (No such file or directory)
0.912 ( 0.001 ms): sleep/146484 openat(dfd: CWD, filename: "/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo") = -1 ENOENT (No such file or directory)
0.914 ( 0.002 ms): sleep/146484 openat(dfd: CWD, filename: "/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo") = -1 ENOENT (No such file or directory)
0.916 ( 0.001 ms): sleep/146484 openat(dfd: CWD, filename: "/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo") = -1 ENOENT (No such file or directory)
0.918 ( 0.001 ms): sleep/146484 openat(dfd: CWD, filename: "/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo") = -1 ENOENT (No such file or directory)
0.920 ( 0.002 ms): sleep/146484 openat(dfd: CWD, filename: "/usr/share/locale/en/LC_MESSAGES/coreutils.mo") = -1 ENOENT (No such file or directory)
0.930 ( 0.055 ms): sleep/146484 clock_nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 1 }, rmtp: 0x7ffefb4990f0) = 0
0.987 ( 0.001 ms): sleep/146484 close(fd: 1) = 0
0.989 ( 0.001 ms): sleep/146484 close(fd: 2) = 0
0.992 ( ): sleep/146484 exit_group() = ?
Summary of events:
total, 3096 events
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
ppoll 317 0 47.372 0.000 0.149 3.804 17.80%
recvfrom 8 8 18.000 1.986 2.250 2.996 7.19%
sched_setaffinity 66 0 0.743 0.001 0.011 0.021 6.16%
execve 6 5 0.644 0.001 0.107 0.630 97.28%
write 1268 0 0.548 0.000 0.000 0.005 2.30%
read 390 75 0.158 0.000 0.000 0.012 9.19%
ioctl 138 1 0.119 0.000 0.001 0.011 14.79%
newfstatat 28 17 0.079 0.001 0.003 0.025 33.91%
rt_sigaction 446 0 0.077 0.000 0.000 0.002 4.78%
futex 20 1 0.077 0.000 0.004 0.037 51.43%
openat 13 6 0.057 0.001 0.004 0.032 51.97%
clock_nanosleep 1 0 0.055 0.055 0.055 0.055 0.00%
rt_sigprocmask 290 0 0.047 0.000 0.000 0.002 5.61%
mmap 8 0 0.021 0.002 0.003 0.004 12.60%
poll 4 0 0.015 0.000 0.004 0.014 92.77%
readlink 5 0 0.014 0.001 0.003 0.005 28.80%
close 15 0 0.009 0.000 0.001 0.001 12.52%
pread64 10 0 0.009 0.000 0.001 0.003 26.77%
recvmsg 17 13 0.008 0.000 0.000 0.002 23.80%
mprotect 3 0 0.006 0.002 0.002 0.003 15.31%
sendmsg 5 0 0.006 0.001 0.001 0.002 21.98%
fstat 6 0 0.005 0.000 0.001 0.001 23.30%
brk 3 0 0.004 0.001 0.001 0.003 39.48%
munmap 1 0 0.003 0.003 0.003 0.003 0.00%
access 1 1 0.002 0.002 0.002 0.002 0.00%
timerfd_settime 5 0 0.002 0.000 0.000 0.000 11.96%
eventfd2 1 0 0.002 0.002 0.002 0.002 0.00%
sched_getaffinity 2 0 0.001 0.001 0.001 0.001 0.96%
getrandom 1 0 0.001 0.001 0.001 0.001 0.00%
rt_sigreturn 1 0 0.001 0.001 0.001 0.001 0.00%
prlimit64 1 0 0.001 0.001 0.001 0.001 0.00%
set_tid_address 1 0 0.001 0.001 0.001 0.001 0.00%
getpid 6 0 0.001 0.000 0.000 0.000 14.19%
arch_prctl 1 0 0.001 0.001 0.001 0.001 0.00%
set_robust_list 1 0 0.001 0.001 0.001 0.001 0.00%
rseq 1 0 0.001 0.001 0.001 0.001 0.00%
fcntl 3 0 0.001 0.000 0.000 0.000 20.48%
epoll_wait 2 0 0.001 0.000 0.000 0.000 38.12%
uname 1 0 0.000 0.000 0.000 0.000 0.00%
> Anyway, I don't mind adding these details later on, so
>
> Reviewed-by: Howard Chu <howardchu95@...il.com>
Thanks, applied to perf-tools-next,
- Arnaldo
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