Posts

All the articles I've posted.

• System Design - How the Linux Process Scheduler (CFS) Works

  16 May, 2026

  How Linux's Completely Fair Scheduler (CFS) works: virtual runtime, red-black tree scheduling, nice values, CPU bandwidth control, and source code walkthrough from the kernel's sched/fair.c.

• System Design - How Linux io_uring Works

  15 May, 2026

  How Linux io_uring works: the submission and completion ring buffers, zero-copy I/O without system call overhead, kernel polling mode, and source code walkthrough from the liburing library.

• System Design - How Two-Phase Commit (2PC) Works

  14 May, 2026

  How two-phase commit (2PC) works in distributed databases: the coordinator/participant model, prepare and commit phases, failure handling, recovery via write-ahead logging, and real-world implementations in PostgreSQL, MySQL, and TiDB.

• LeetCode 209 Minimum Size Subarray Sum

  14 May, 2026

  Solutions for LeetCode 209, medium, tags: array, binary search, sliding window, prefix sum.

• LeetCode 121 Best Time to Buy and Sell Stock

  14 May, 2026

  Solutions for LeetCode 121, easy, tags: array, dynamic programming.

• LeetCode 143 Reorder List

  11 May, 2026

  Solutions for LeetCode 143, medium, tags: linked list, two pointers, stack, recursion.