# Page Not Found

The URL `00-index/04-ftrace_internal` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [探秘ftrace](https://richardweiyang-2.gitbook.io/kernel-exploring/00-index-2/04-ftrace_internal.md)
- [TraceEvent](https://richardweiyang-2.gitbook.io/kernel-exploring/00-index-2/02-trace_event.md)
- [ftrace的使用](https://richardweiyang-2.gitbook.io/kernel-exploring/00-index-2/03-ftrace_usage.md)
- [cgroup和进程的关联](https://richardweiyang-2.gitbook.io/kernel-exploring/00-index/04-cgroup_and_process.md)
- [cgroup数据统计](https://richardweiyang-2.gitbook.io/kernel-exploring/00-index/05-statistics.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://richardweiyang-2.gitbook.io/kernel-exploring/00-index-2/04-ftrace_internal.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://richardweiyang-2.gitbook.io/kernel-exploring/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://richardweiyang-2.gitbook.io/kernel-exploring/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/kernel-exploring/00-index-2/04-ftrace_internal.md`).

You may also use `Accept: text/markdown` header for content negotiation.