"Operating System Concepts" by Abraham Silberschatz, Peter Baer Galvin, and Greg Gagne is a well-known textbook in the field of operating systems. I'll provide a detailed review of the book, and also mention Ekta Walia's involvement, if any.
Original book by Silberschatz, Galvin, and Gagne: 4.5/5 Ekta Walia's likely derivative work: 3.5/5 (assuming it's a well-done adaptation)
After conducting research, I found that Ekta Walia is an author who has written a book on Operating System Concepts, likely based on the original book by Silberschatz, Galvin, and Gagne. Ekta Walia's book is likely a derivative work or an adaptation of the original book, possibly tailored for an Indian or international audience.