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perf 工具介绍3

2015-11-06 22:06 274 查看

http://blog.chinaunix.net/uid-10540984-id-3854969.html

http://blog.csdn.net/zhangskd/article/details/37902159

[root@localhost ~]# perf record -e cpu-clock ./t1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.003 MB perf.data (~137 samples) ]
[root@localhost ~]# perf report
# Samples: 102
#
# Overhead Command Shared Object Symbol
# ........ ....... ............. ......
#
99.02% t1 ./t1 [.] longa
0.98% t1 [kernel] [k] do_page_fault

-----------------------------------------------------------------------------

usage: perf top [<options>]

-e, --event <event>   event selector. use 'perf list' to list available events
-c, --count <n>       event period to sample
-p, --pid <n>         profile events on existing pid
-a, --all-cpus        system-wide collection from all CPUs
-C, --CPU <n>         CPU to profile on
-k, --vmlinux <file>  vmlinux pathname
-m, --mmap-pages <n>  number of mmap data pages
-r, --realtime <n>    collect data with this RT SCHED_FIFO priority
-d, --delay <n>       number of seconds to delay between refreshes
-D, --dump-symtab     dump the symbol table used for profiling
-f, --count-filter <n>
only display functions with more events than this
-g, --group           put the counters into a counter group
-i, --inherit         child tasks inherit counters
-s, --sym-annotate <symbol name>
symbol to annotate - requires -k option
-z, --zero            zero history across updates
-F, --freq <n>        profile at this frequency
-E, --entries <n>     display this many functions
-v, --verbose         be more verbose (show counter open errors, etc)

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