perf 工具介绍1
https://perf.wiki.kernel.org/index.php/Tutorial
http://os.51cto.com/art/201105/265133.htm
在LINUX 源代码中安装perf
[root@localhost perf]# pwd
/usr/src/kernels/linux-2.6.32/tools/perf
[root@localhost perf]# yum install binutils-devel
[root@localhost perf]# make
[root@localhost perf]# make install
install -d -m 755 '/root/bin'
install perf '/root/bin'
[root@localhost perf]# mount -t debugfs none /sys/kernel/debug/ [root@localhost perf]# perf list List of pre-defined events (to be used in -e): cpu-cycles OR cycles [Hardware event]
instructions [Hardware event]
cache-references [Hardware event]
cache-misses [Hardware event]
branch-instructions OR branches [Hardware event]
branch-misses [Hardware event]
bus-cycles [Hardware event] cpu-clock [Software event]
task-clock [Software event]
page-faults OR faults [Software event]
minor-faults [Software event]
major-faults [Software event]
context-switches OR cs [Software event]
cpu-migrations OR migrations [Software event] L1-dcache-loads [Hardware cache event]
L1-dcache-load-misses [Hardware cache event]
L1-dcache-stores [Hardware cache event]
L1-dcache-store-misses [Hardware cache event]
L1-dcache-prefetches [Hardware cache event]
L1-dcache-prefetch-misses [Hardware cache event]
L1-icache-loads [Hardware cache event]
L1-icache-load-misses [Hardware cache event]
L1-icache-prefetches [Hardware cache event]
L1-icache-prefetch-misses [Hardware cache event]
LLC-loads [Hardware cache event]
LLC-load-misses [Hardware cache event]
LLC-stores [Hardware cache event]
LLC-store-misses [Hardware cache event]
LLC-prefetches [Hardware cache event]
LLC-prefetch-misses [Hardware cache event]
dTLB-loads [Hardware cache event]
dTLB-load-misses [Hardware cache event]
dTLB-stores [Hardware cache event]
dTLB-store-misses [Hardware cache event]
dTLB-prefetches [Hardware cache event]
dTLB-prefetch-misses [Hardware cache event]
iTLB-loads [Hardware cache event]
iTLB-load-misses [Hardware cache event]
branch-loads [Hardware cache event]
branch-load-misses [Hardware cache event] rNNN [raw hardware event descriptor]
skb:kfree_skb [Tracepoint event]
skb:skb_copy_datagram_iovec [Tracepoint event]
block:block_rq_abort [Tracepoint event]
block:block_rq_insert [Tracepoint event]
block:block_rq_issue [Tracepoint event]
block:block_rq_requeue [Tracepoint event]
block:block_rq_complete [Tracepoint event]
block:block_bio_bounce [Tracepoint event]
block:block_bio_complete [Tracepoint event]
block:block_bio_backmerge [Tracepoint event]
block:block_bio_frontmerge [Tracepoint event]
block:block_bio_queue [Tracepoint event]
block:block_getrq [Tracepoint event]
block:block_sleeprq [Tracepoint event]
block:block_plug [Tracepoint event]
block:block_unplug_timer [Tracepoint event]
block:block_unplug_io [Tracepoint event]
block:block_split [Tracepoint event]
block:block_remap [Tracepoint event]
block:block_rq_remap [Tracepoint event]
kmem:kmalloc [Tracepoint event]
kmem:kmem_cache_alloc [Tracepoint event]
kmem:kmalloc_node [Tracepoint event]
kmem:kmem_cache_alloc_node [Tracepoint event]
kmem:kfree [Tracepoint event]
kmem:kmem_cache_free [Tracepoint event]
kmem:mm_page_free_direct [Tracepoint event]
kmem:mm_pagevec_free [Tracepoint event]
kmem:mm_page_alloc [Tracepoint event]
kmem:mm_page_alloc_zone_locked [Tracepoint event]
kmem:mm_page_pcpu_drain [Tracepoint event]
kmem:mm_page_alloc_extfrag [Tracepoint event]
power:power_start [Tracepoint event]
power:power_end [Tracepoint event]
power:power_frequency [Tracepoint event]
module:module_load [Tracepoint event]
module:module_free [Tracepoint event]
module:module_get [Tracepoint event]
module:module_put [Tracepoint event]
module:module_request [Tracepoint event]
workqueue:workqueue_insertion [Tracepoint event]
workqueue:workqueue_execution [Tracepoint event]
workqueue:workqueue_creation [Tracepoint event]
workqueue:workqueue_destruction [Tracepoint event]
timer:timer_init [Tracepoint event]
timer:timer_start [Tracepoint event]
timer:timer_expire_entry [Tracepoint event]
timer:timer_expire_exit [Tracepoint event]
timer:timer_cancel [Tracepoint event]
timer:hrtimer_init [Tracepoint event]
timer:hrtimer_start [Tracepoint event]
timer:hrtimer_expire_entry [Tracepoint event]
timer:hrtimer_expire_exit [Tracepoint event]
timer:hrtimer_cancel [Tracepoint event]
timer:itimer_state [Tracepoint event]
timer:itimer_expire [Tracepoint event]
irq:irq_handler_entry [Tracepoint event]
irq:irq_handler_exit [Tracepoint event]
irq:softirq_entry [Tracepoint event]
irq:softirq_exit [Tracepoint event]
sched:sched_kthread_stop [Tracepoint event]
sched:sched_kthread_stop_ret [Tracepoint event]
sched:sched_wait_task [Tracepoint event]
sched:sched_wakeup [Tracepoint event]
sched:sched_wakeup_new [Tracepoint event]
sched:sched_switch [Tracepoint event]
sched:sched_migrate_task [Tracepoint event]
sched:sched_process_free [Tracepoint event]
sched:sched_process_exit [Tracepoint event]
sched:sched_process_wait [Tracepoint event]
sched:sched_process_fork [Tracepoint event]
sched:sched_signal_send [Tracepoint event]
sched:sched_stat_wait [Tracepoint event]
sched:sched_stat_runtime [Tracepoint event]
sched:sched_stat_sleep [Tracepoint event]
sched:sched_stat_iowait [Tracepoint event]
syscalls:sys_enter [Tracepoint event]
syscalls:sys_exit [Tracepoint event]
[root@localhost perf]# perf --help usage: perf [--version] [--help] COMMAND [ARGS] The most commonly used perf commands are:
annotate Read perf.data (created by perf record) and display annotated code
list List all symbolic event types
record Run a command and record its profile into perf.data
report Read perf.data (created by perf record) and display the profile
sched Tool to trace/measure scheduler properties (latencies)
stat Run a command and gather performance counter statistics
timechart Tool to visualize total system behavior during a workload
top System profiling tool.
trace Read perf.data (created by perf record) and display trace output See 'perf help COMMAND' for more information on a specific command
usage: perf stat [<options>] <command>
-e, --event <event> event selector. use 'perf list' to list available events
-i, --inherit child tasks inherit counters
-p, --pid <n> stat events on existing pid
-a, --all-cpus system-wide collection from all CPUs
-c, --scale scale/normalize counters
-v, --verbose be more verbose (show counter open errors, etc)
-r, --repeat <n> repeat command and print average + stddev (max: 100)
-n, --null null run - dont start any counters
[root@localhost perf]# perf stat dd if=/dev/zero of=/dev/null count= + records in
+ records out
bytes ( MB) copied, 0.522033 seconds, MB/s Performance counter stats for 'dd if=/dev/zero of=/dev/null count=1000000': 514.982845 task-clock-msecs # 0.978 CPUs
context-switches # 0.000 M/sec
CPU-migrations # 0.000 M/sec
page-faults # 0.000 M/sec
cycles # 0.000 M/sec
instructions # 0.000 IPC
cache-references # 0.000 M/sec
cache-misses # 0.000 M/sec 0.526756322 seconds time elapsed
[root@localhost perf]# perf stat -e r1a8 -a sleep
Performance counter stats for 'sleep 1':
raw 0x1a8 # 0.000 M/sec
1.003503666 seconds time elapsed
[root@localhost perf]# perf stat -r sleep
Performance counter stats for 'sleep 1' ( runs):
3.083876 task-clock-msecs # 0.003 CPUs ( +- 13.690% )
context-switches # 0.000 M/sec ( +- 0.000% )
CPU-migrations # 0.000 M/sec ( +- nan% )
page-faults # 0.046 M/sec ( +- 0.171% )
cycles # 0.000 M/sec ( +- nan% )
instructions # 0.000 IPC ( +- nan% )
cache-references # 0.000 M/sec ( +- nan% )
cache-misses # 0.000 M/sec ( +- nan% )
1.005166673 seconds time elapsed ( +- 0.050% )
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