"Operating System Concepts" by Silberschatz, Galvin, and Gagne is a renowned textbook in the field of operating systems. Ekta Walia's likely derivative work based on this book might cater to a specific audience, such as Indian students or professionals. If you're looking for a comprehensive introduction to operating system concepts, I recommend the original book. If you're interested in a more localized perspective, Ekta Walia's book might be a suitable alternative.