# Perf-tools

Rust library for Linux perf.

The current feature is converting a perf.data file (CPU profiling) generated by the perf Linux profiler, into data for [Google pprof tool](https://github.com/google/pprof).

I tried Google's [perf_data_converter](https://github.com/google/perf_data_converter) but seems that [it doesn't support dwarf stacks](https://github.com/google/perf_data_converter/issues/70). So I tried to start from scratch in Rust rather than playing with the C++ code.

![](.github/assets/shell-cargo-perf.gif)

## Installation

```bash
cargo install perf-tools
```

## Usage

If you already have a perf.data file, just run `perf2pprof` command:

```bash
$ ls
Cargo.lock  Cargo.toml  cpu.pprof  perf.data  src  target
$ perf2pprof
```

`cargo perf` command does everything as the above picture shows if you haven't run perf command yet.

## Preparation

Firstly, better to have debugging symbols for the GNU C library (`libc6-dbg` package in Ubuntu).

Secondly, the following configuration might be necessary:

```bash
$ sudo sysctl -w kernel.kptr_restrict=0
$ echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid
```

Lastly, put the following in your `Cargo.toml` file:

```
[profile.release]
debug = true
```

## Caveat

Only a minimum of information are converted. It's on my to-do list. Of course, pull requests are very welcome.