8eded45fcd
Just like strace has:
# trace -s sleep 1
Summary of events:
sleep (32370), 80 events, 93.0%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
nanosleep 1 0 1000.402 1000.402 1000.402 1000.402 0.00%
mmap 8 0 0.023 0.002 0.003 0.004 8.49%
close 5 0 0.015 0.001 0.003 0.009 51.39%
mprotect 4 0 0.014 0.002 0.003 0.005 16.95%
openat 3 0 0.013 0.003 0.004 0.005 14.29%
munmap 1 0 0.010 0.010 0.010 0.010 0.00%
read 4 0 0.005 0.001 0.001 0.002 16.83%
brk 4 0 0.004 0.001 0.001 0.002 20.82%
access 1 1 0.004 0.004 0.004 0.004 0.00%
fstat 3 0 0.003 0.001 0.001 0.001 12.17%
lseek 3 0 0.003 0.001 0.001 0.001 11.45%
arch_prctl 2 1 0.002 0.001 0.001 0.001 2.30%
execve 1 0 0.000 0.000 0.000 0.000 0.00%
#
# perf trace -S sleep 1
? ... [continued]: execve()) = 0
0.028 brk(brk: NULL) = 0x559f5bd96000
0.033 arch_prctl(option: 0x3001, arg2: 0x7ffda8b715a0) = -1 EINVAL (Invalid argument)
0.046 access(filename: "/etc/ld.so.preload", mode: R) = -1 ENOENT (No such file or directory)
0.055 openat(dfd: CWD, filename: "/etc/ld.so.cache", flags: RDONLY|CLOEXEC) = 3
0.060 fstat(fd: 3, statbuf: 0x7ffda8b707a0) = 0
0.062 mmap(addr: NULL, len: 134346, prot: READ, flags: PRIVATE, fd: 3, off: 0) = 0x7f3aedfc4000
0.066 close(fd: 3) = 0
0.079 openat(dfd: CWD, filename: "/lib64/libc.so.6", flags: RDONLY|CLOEXEC) = 3
0.085 read(fd: 3, buf: 0x7ffda8b70948, count: 832) = 832
0.088 lseek(fd: 3, offset: 792, whence: SET) = 792
0.090 read(fd: 3, buf: 0x7ffda8b70810, count: 68) = 68
0.093 fstat(fd: 3, statbuf: 0x7ffda8b707f0) = 0
0.095 mmap(addr: NULL, len: 8192, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS) = 0x7f3aedfc2000
0.101 lseek(fd: 3, offset: 792, whence: SET) = 792
0.103 read(fd: 3, buf: 0x7ffda8b70450, count: 68) = 68
0.105 lseek(fd: 3, offset: 864, whence: SET) = 864
0.107 read(fd: 3, buf: 0x7ffda8b70470, count: 32) = 32
0.110 mmap(addr: NULL, len: 1857472, prot: READ, flags: PRIVATE|DENYWRITE, fd: 3, off: 0) = 0x7f3aeddfc000
0.114 mprotect(start: 0x7f3aede1e000, len: 1679360, prot: NONE) = 0
0.121 mmap(addr: 0x7f3aede1e000, len: 1363968, prot: READ|EXEC, flags: PRIVATE|FIXED|DENYWRITE, fd: 3, off: 0x22000) = 0x7f3aede1e000
0.127 mmap(addr: 0x7f3aedf6b000, len: 311296, prot: READ, flags: PRIVATE|FIXED|DENYWRITE, fd: 3, off: 0x16f000) = 0x7f3aedf6b000
0.131 mmap(addr: 0x7f3aedfb8000, len: 24576, prot: READ|WRITE, flags: PRIVATE|FIXED|DENYWRITE, fd: 3, off: 0x1bb000) = 0x7f3aedfb8000
0.138 mmap(addr: 0x7f3aedfbe000, len: 14272, prot: READ|WRITE, flags: PRIVATE|FIXED|ANONYMOUS) = 0x7f3aedfbe000
0.147 close(fd: 3) = 0
0.158 arch_prctl(option: SET_FS, arg2: 0x7f3aedfc3580) = 0
0.210 mprotect(start: 0x7f3aedfb8000, len: 16384, prot: READ) = 0
0.230 mprotect(start: 0x559f5b27d000, len: 4096, prot: READ) = 0
0.236 mprotect(start: 0x7f3aee00f000, len: 4096, prot: READ) = 0
0.240 munmap(addr: 0x7f3aedfc4000, len: 134346) = 0
0.300 brk(brk: NULL) = 0x559f5bd96000
0.302 brk(brk: 0x559f5bdb7000) = 0x559f5bdb7000
0.305 brk(brk: NULL) = 0x559f5bdb7000
0.310 openat(dfd: CWD, filename: "/usr/lib/locale/locale-archive", flags: RDONLY|CLOEXEC) = 3
0.315 fstat(fd: 3, statbuf: 0x7f3aedfbdac0) = 0
0.318 mmap(addr: NULL, len: 217750512, prot: READ, flags: PRIVATE, fd: 3, off: 0) = 0x7f3ae0e52000
0.325 close(fd: 3) = 0
0.358 nanosleep(rqtp: 0x7ffda8b714b0, rmtp: NULL) = 0
1000.622 close(fd: 1) = 0
1000.641 close(fd: 2) = 0
1000.664 exit_group(error_code: 0) = ?
Summary of events:
sleep (722), 80 events, 93.0%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
nanosleep 1 0 1000.194 1000.194 1000.194 1000.194 0.00%
mmap 8 0 0.025 0.002 0.003 0.005 10.17%
close 5 0 0.018 0.001 0.004 0.010 50.18%
mprotect 4 0 0.016 0.003 0.004 0.006 16.81%
openat 3 0 0.011 0.003 0.004 0.004 6.57%
munmap 1 0 0.010 0.010 0.010 0.010 0.00%
brk 4 0 0.005 0.001 0.001 0.002 20.72%
read 4 0 0.005 0.001 0.001 0.002 16.71%
access 1 1 0.005 0.005 0.005 0.005 0.00%
fstat 3 0 0.004 0.001 0.001 0.002 14.82%
lseek 3 0 0.003 0.001 0.001 0.001 11.66%
arch_prctl 2 1 0.002 0.001 0.001 0.001 3.59%
execve 1 0 0.000 0.000 0.000 0.000 0.00%
#
Works for system wide, e.g. for 1ms:
# perf trace -s -a sleep 0.001
Summary of events:
sleep (768), 94 events, 37.9%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
nanosleep 1 0 1.133 1.133 1.133 1.133 0.00%
execve 7 6 0.351 0.003 0.050 0.316 88.53%
mmap 8 0 0.024 0.002 0.003 0.004 8.86%
mprotect 4 0 0.017 0.003 0.004 0.006 16.02%
openat 3 0 0.013 0.004 0.004 0.005 8.34%
munmap 1 0 0.010 0.010 0.010 0.010 0.00%
brk 4 0 0.007 0.001 0.002 0.002 10.99%
close 5 0 0.005 0.001 0.001 0.002 11.69%
read 5 0 0.005 0.000 0.001 0.002 30.53%
access 1 1 0.004 0.004 0.004 0.004 0.00%
fstat 3 0 0.004 0.001 0.001 0.002 10.74%
lseek 3 0 0.003 0.001 0.001 0.001 10.20%
arch_prctl 2 1 0.002 0.001 0.001 0.001 3.34%
Web Content (21258), 46 events, 18.5%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
recvmsg 12 12 0.015 0.001 0.001 0.002 8.50%
futex 2 0 0.008 0.003 0.004 0.005 27.08%
poll 6 0 0.006 0.000 0.001 0.002 22.14%
read 2 0 0.006 0.002 0.003 0.003 26.08%
write 1 0 0.002 0.002 0.002 0.002 0.00%
Web Content (4365), 36 events, 14.5%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
recvmsg 10 10 0.015 0.001 0.002 0.003 11.83%
poll 5 0 0.006 0.000 0.001 0.002 28.44%
futex 2 0 0.005 0.001 0.003 0.004 48.29%
read 1 0 0.003 0.003 0.003 0.003 0.00%
Timer (21275), 14 events, 5.6%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
futex 6 1 0.240 0.000 0.040 0.149 64.58%
write 1 0 0.008 0.008 0.008 0.008 0.00%
Timer (4383), 14 events, 5.6%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
futex 6 2 0.186 0.000 0.031 0.181 96.45%
write 1 0 0.010 0.010 0.010 0.010 0.00%
Web Content (20354), 28 events, 11.3%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
recvmsg 8 8 0.010 0.001 0.001 0.002 15.24%
poll 4 0 0.004 0.000 0.001 0.002 35.68%
futex 1 0 0.003 0.003 0.003 0.003 0.00%
read 1 0 0.003 0.003 0.003 0.003 0.00%
Timer (20371), 10 events, 4.0%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
futex 4 1 0.077 0.000 0.019 0.075 95.46%
write 1 0 0.005 0.005 0.005 0.005 0.00%
[root@quaco ~]#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-k7kh2muo5oeg56yx446hnw9v@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.