jeprofl: A low-overhead allocation profiler using eBPF
https://github.com/0xdeafbeef/jeprofl
Hey Rustaceans! I wanted to share a project I've been working on called jeprofl. It's a memory allocation profiling tool that uses eBPF to analyze allocations in your programs.
Key features:
- Attach to running programs without recompilation
- Low overhead: 80 ns per call under 2.5M allocations/sec with 1000x sampling
- Support for various allocation functions(malloc, realloc, calloc..)
- Configurable event sampling and allocation size filtering
- Generate CSV output and flame graphs
- Track allocation histograms per stack trace
Here's a sample of what the output looks like:
6ae5a0 - malloc
4e54b0 - uu_ls::enter_directory
4e54b0 - uu_ls::enter_directory
4e54b0 - uu_ls::enter_directory
4e54b0 - uu_ls::enter_directory
4db790 - uu_ls::list
23b070 - uu_ls::uumain
bb560 - coreutils::main
1c9e60 - std::sys::backtrace::__rust_begin_short_backtrace
bdf00 - main
2a010 - __libc_start_call_main
2a0c0 - __libc_start_main_alias_2
a7f00 - _start
-----------+-----------+------------+--------------------------------------------------
Size | Count | Percentage | Distribution
-----------+-----------+------------+--------------------------------------------------
1 B | 16870 | 4.23% | #######
2 B | 21716 | 5.44% | #########
4 B | 38150 | 9.56% | ################
8 B | 120776 | 30.27% | ##################################################
16 B | 103586 | 25.97% | ###########################################
32 B | 58988 | 14.79% | ########################
64 B | 7444 | 1.87% | ###
128 B | 14768 | 3.70% | ######
512 B | 16638 | 4.17% | #######
Total allocations: 18.4 MiB in 398936 allocations
``````
6ae5a0 - malloc
4e54b0 - uu_ls::enter_directory
4e54b0 - uu_ls::enter_directory
4e54b0 - uu_ls::enter_directory
4e54b0 - uu_ls::enter_directory
4db790 - uu_ls::list
23b070 - uu_ls::uumain
bb560 - coreutils::main
1c9e60 - std::sys::backtrace::__rust_begin_short_backtrace
bdf00 - main
2a010 - __libc_start_call_main
2a0c0 - __libc_start_main_alias_2
a7f00 - _start
-----------+-----------+------------+--------------------------------------------------
Size | Count | Percentage | Distribution
-----------+-----------+------------+--------------------------------------------------
1 B | 16870 | 4.23% | #######
2 B | 21716 | 5.44% | #########
4 B | 38150 | 9.56% | ################
8 B | 120776 | 30.27% | ##################################################
16 B | 103586 | 25.97% | ###########################################
32 B | 58988 | 14.79% | ########################
64 B | 7444 | 1.87% | ###
128 B | 14768 | 3.70% | ######
512 B | 16638 | 4.17% | #######
Total allocations: 18.4 MiB in 398936 allocations
