flamegraphing tools

[dvc94ch]

• cpu: user space stack trace samples: profile:hz:99
• cache: L3 cache misses
• threads: count forks
• mem: allocations: count malloc/ralloc/free: uprobe:libc:malloc
• mem: usage: count allocation size of malloc/ralloc/free
• net: bandwidth: count sendmsg/sendmmesg buffer size
• blocking: kprobe:finish_task_switch