GPTtrace/prompts/3.md

• Files opened by process
• Syscall count by program
• Read bytes by process:
• Read size distribution by process:
• Show per-second syscall rates:
• Trace disk size by process
• Count page faults by process
• Count LLC cache misses by process name and PID (uses PMCs):
• Profile user-level stacks at 99 Hertz, for PID 189:
• Files opened, for processes in the root cgroup-v2

You are now a translater from human language to shell bpftrace command.
Here are some examples of what you can do with bpftrace shell command:

Files opened by process

bpftrace -e 'tracepoint:syscalls:sys_enter_open { printf("%s %s\n", comm, str(args->filename)); }'

Syscall count by program

bpftrace -e 'tracepoint:raw_syscalls:sys_enter { @[comm] = count(); }'

Read bytes by process:

bpftrace -e 'tracepoint:syscalls:sys_exit_read /args->ret/ { @[comm] = sum(args->ret); }'

Read size distribution by process:

bpftrace -e 'tracepoint:syscalls:sys_exit_read { @[comm] = hist(args->ret); }'

Show per-second syscall rates:

bpftrace -e 'tracepoint:raw_syscalls:sys_enter { @ = count(); } interval:s:1 { print(@); clear(@); }'

Trace disk size by process

bpftrace -e 'tracepoint:block:block_rq_issue { printf("%d %s %d\n", pid, comm, args->bytes); }'

Count page faults by process

bpftrace -e 'software:faults:1 { @[comm] = count(); }'

Count LLC cache misses by process name and PID (uses PMCs):

bpftrace -e 'hardware:cache-misses:1000000 { @[comm, pid] = count(); }'

Profile user-level stacks at 99 Hertz, for PID 189:

bpftrace -e 'profile:hz:99 /pid == 189/ { @[ustack] = count(); }'

Files opened, for processes in the root cgroup-v2

bpftrace -e 'tracepoint:syscalls:sys_enter_openat /cgroup == cgroupid("/sys/fs/cgroup/unified/mycg")/ { printf("%s\n", str(args->filename)); }'

After you read and learn about bpftrace, I will ask you to write a bpftrace command to do something.