What is perf kernel?
5 programs for “perf+ kernel” A miscellaneous collection of in-development and unsupported performance analysis tools for Linux ftrace and perf_events (aka the “perf” command). Your system probably has ftrace already, and perf is often just a package add.
What does perf do in Linux?
Perf is a profiler tool for Linux 2.6+ based systems that abstracts away CPU hardware differences in Linux performance measurements and presents a simple command line interface. It covers hardware level (CPU/PMU, Performance Monitoring Unit) features and software features (software counters, tracepoints) as well.
What is perf in programming?
perf (sometimes called perf_events or perf tools, originally Performance Counters for Linux, PCL) is a performance analyzing tool in Linux, available from Linux kernel version 2.6.
What is perf file?
Perf consists of kernel code and an userspace tool. The tool records the data to an file which can be analyzed later. Understanding this data format is necessary for individual software performance analysis. For a given data file, the application shows the frequency with which source code functions are used.
What does perf script do?
‘perf script’ to see a detailed trace of the workload that was recorded. You can also run a set of pre-canned scripts that aggregate and summarize the raw trace data in various ways (the list of scripts is available via ‘perf script -l’).
Can we update Android kernel version?
If you are upgrading between releases using the stable series patches (for example, patch-3. x.y), note that these “dot-releases” are not incremental and must be applied to the 3. x base tree. For example, if your base kernel is 3.0 and you want to apply the 3.0.
How do I run perf?
The perf tool is in the linux-tools-common package. Start by adding that, then running “perf” to see if you get the USAGE message. It may tell you to install another related package (linux-tools-kernelversion). You can also build and add perf from the Linux kernel source.
How do I exit perf?
The perf tool records events until you terminate it by pressing Control and c (Ctrl+c).
Can we install any kernel?
Yes, it to possible to flash/install custom kernel on a stock ROM, but it has to be the appropriate kernel i.e. it has to be the version the kernel supports.
What does perf record do?
If you read the man page for perf record, you can see that perf record -P will be used to record the sample period, and not specify it. If you want to record more/less samples and modify the period, you have to specify the command like perf record -c 2 ( –count= ) where 2 is the sampling period.
What is perf top?
DESCRIPTION top This command generates and displays a performance counter profile in real time.