diff --git a/documentation/profile-manual/profile-manual-usage.xml b/documentation/profile-manual/profile-manual-usage.xml index 68ea68507b..2143cbbefc 100644 --- a/documentation/profile-manual/profile-manual-usage.xml +++ b/documentation/profile-manual/profile-manual-usage.xml @@ -123,18 +123,18 @@ host of supported busybox applets in Yocto. root@crownbay:~# rm linux-2.6.19.2.tar.bz2; \ - wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 The quickest and easiest way to get some basic overall data about what's going on for a particular workload it to profile it using 'perf stat'. 'perf stat' basically profiles using a few default counters and displays the summed counts at the end of the run: - root@crownbay:~# perf stat wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + root@crownbay:~# perf stat wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 Connecting to downloads.yoctoproject.org (140.211.169.59:80) linux-2.6.19.2.tar.b 100% |***************************************************| 41727k 0:00:00 ETA - Performance counter stats for 'wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2': + Performance counter stats for 'wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2': 4597.223902 task-clock # 0.077 CPUs utilized 23568 context-switches # 0.005 M/sec @@ -161,11 +161,11 @@ see a summary of all the events related to kernel memory allocation/freeing along with cache hits and misses: - root@crownbay:~# perf stat -e kmem:* -e cache-references -e cache-misses wget http:// downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + root@crownbay:~# perf stat -e kmem:* -e cache-references -e cache-misses wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 Connecting to downloads.yoctoproject.org (140.211.169.59:80) linux-2.6.19.2.tar.b 100% |***************************************************| 41727k 0:00:00 ETA - Performance counter stats for 'wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2': + Performance counter stats for 'wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2': 5566 kmem:kmalloc 125517 kmem:kmem_cache_alloc @@ -205,7 +205,7 @@ samples until the process exits and records them in a file named 'perf.data' in the current working directory. - root@crownbay:~# perf record wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + root@crownbay:~# perf record wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 Connecting to downloads.yoctoproject.org (140.211.169.59:80) linux-2.6.19.2.tar.b 100% |************************************************| 41727k 0:00:00 ETA @@ -253,7 +253,7 @@ of a sampled function, but the entire callchain to the sampled function as well: - root@crownbay:~# perf record -g wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + root@crownbay:~# perf record -g wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 Connecting to downloads.yoctoproject.org (140.211.169.59:80) linux-2.6.19.2.tar.b 100% |************************************************| 41727k 0:00:00 ETA [ perf record: Woken up 3 times to write data ] @@ -619,8 +619,8 @@ (identified by the string before the colon in the Tracepoint events) and do a 'perf stat' run using only those wildcarded subsystems: - root@crownbay:~# perf stat -e skb:* -e net:* -e napi:* -e sched:* -e workqueue:* -e irq:* -e syscalls:* wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 - Performance counter stats for 'wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2': + root@crownbay:~# perf stat -e skb:* -e net:* -e napi:* -e sched:* -e workqueue:* -e irq:* -e syscalls:* wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + Performance counter stats for 'wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2': 23323 skb:kfree_skb 0 skb:consume_skb @@ -679,7 +679,7 @@ Let's pick one of these tracepoints and tell perf to do a profile using it as the sampling event: - root@crownbay:~# perf record -g -e sched:sched_wakeup wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + root@crownbay:~# perf record -g -e sched:sched_wakeup wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 @@ -750,7 +750,7 @@ root@crownbay:~# perf record -g -e skb:* -e net:* -e napi:* -e sched:sched_switch -e sched:sched_wakeup -e irq:* -e syscalls:sys_enter_read -e syscalls:sys_exit_read -e syscalls:sys_enter_write -e syscalls:sys_exit_write - wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 + wget http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2 We can look at the raw trace output using 'perf script' with no arguments: