process file

- Clarifies that real-time system information is fed to monitoring tools like `htop`
- Adds a note about the fast retrieval speed of the `/proc` filesystem

Author: xy-241

content/OS/Process/Process File.md

@@ -6,18 +6,18 @@ Author Profile:
 tags:
   - OS
 Creation Date: 2025-05-18, 20:26
-Last Date: 2025-05-18T21:06:31+08:00
+Last Date: 2025-05-18T21:14:58+08:00
 References: 
 draft: 
 description: Understand how Linux exposes process details through the /proc virtual filesystem. Learn about key files like cmdline, environ, fd, maps, status, limits, and io, vital for performance monitoring, debugging latency, and analyzing resource usage in critical applications.
 ---
 ## Abstract
 ---
-![[process_dir.png]]
+![[process_dir.png|500]]
 
 - For [[Linux Kernel|Linux]], we can view the [[Process (进程)|process]] info in the form of [[File|file]] under `/proc/PID` in human-readable text format
 - It allows us to view and modify parameters, automate with shell scripts
-- We also feed these real-time system information to monitoring tools without requiring special APIs
+- We also feed these real-time system information to monitoring tools (like `htop`) without requiring special APIs
 
 >[!important] Key files 
 > - `cmdline`: Contains the command line arguments used to start the process
@@ -33,6 +33,9 @@ description: Understand how Linux exposes process details through the /proc virt
 > - Resource usage of critical trading applications
 > - Debugging latency issues by examining process states
 
+>[!success] Fast speed 
+> `/proc` is memory-backed, so info retrieval is going to be very fast.
+
 ## References
 ---
-- [The Linux Programming Interface](https://man7.org/tlpi/)
+- [The Linux Programming Interface, Chapter 2, Section 19](https://man7.org/tlpi/)