I have been involved in a number of Linux projects aimed at running Linux and enterprise workloads on Linux, efficiently, reliably and with insight while running on IBM Power systems.
Always-on insights - multiple generations of improvements in providing platform insights for cloud. This is done via in memory accumulation (IMA) of counters using microcode running in the processor which are then hooked to the Linux kernel perf subsystem for extraction. Related work - opentracing, perfevents and Linux kernel work here.
UEFI+ACPI for OpenPOWER - We have experimented with TianoCore on OpenPOWER servers and done some of work on a basic ACPI implementation as well. Not working well enough to publish it, may be some day in future.
IBM PowerKVM - First open source hypervisor product on IBM Power (OpenPOWER) systems and three generations of releases. Later this was absorbed in and replaced by Red Hat Enterprise Virtualization.
Co-operative energy management on IBM servers where operating systems co-operate with underlying platform (hypervisor, firmware, hardware) to provide best energy benefits. I was involved in power-aware scheduling (see OLS 2008 / LPC 2010 paper) as well as HW/SW co-design of power management features in multiple generation of Power processors.
Scalable kernel primitives - mainly the first implementations of Read-Copy-Update for Linux one of which was subsequently merged into 2.5.43 kernel. For more up to date information on RCU, see Paul McKenney's RCU page.
P. R. Panda, M. Jain, A. Verma, D. Sarma, V. Srinivasan Power Supply Efficiency Aware Server Allocation in Data Centers 2013 26th International Conference on VLSI Design and 2013 12th International Conference on Embedded Systems IEEE Explore
D. Dharwar, S. Bhat, V. Srinivasan, D. Sarma, P. K. Banerjee Approaches Towards Energy-Efficiency in the Cloud for Emerging Markets, 2012 IEEE International Conference on Cloud Computing in Emerging Markets (CCEM), IEEE Explore
V. Srinivasan, D. Sarma, V. Srivatsa, G. Shenoy, S. Siddha Energy aware task and interrupt management, Proceedings of Ottawa Linux Symposium, Ottawa, July 2008. pdf
P. McKenney, I. Molnar, S. Bhattacharya, D. Sarma, Extending RCU for Realtime and Embedded Workloads, Proceedings of Ottawa Linux Symposium, Ottawa, July 2006. pdf
Ravikiran Thirumalai, Dipankar Sarma, Manfred Spraul, Ho Hum, Do We Need Another Dynamic Per-CPU Allocator ?, Proceedings of Ottawa Linux Symposium, Ottawa, July 2005. pdf
Paul E. McKenney and Dipankar Sarma, Towards Hard Realtime Response from the Linux Kernel, Proceedings of Linux.conf.au, Canberra, April 2005. pdf
Dipankar Sarma and Paul E. McKenney, Issues with Selected Scalability Features of the 2.6 Kernel, Proceedings of Ottawa Linux Symposium, Ottawa, July 2004. pdf
Dipankar Sarma and Paul E. McKenney, Making RCU Safe for Deep Sub-Millisecond Response Realtime Applications, USENIX, Boston, June 2004. pdf
Andrea Arcangeli, Mingming Cao, Paul E. McKenney and Dipankar Sarma, Using Read-Copy-Update Techniques for System V IPC in the Linux 2.5 Kernel, USENIX, San Antonio, June 2003. pdf
Paul E. McKenney, Dipankar Sarma, Andrea Arcangeli, Andi Kleen, Orran Krieger, Rusty Russell, Read Copy Update , Proceedings of Ottawa Linux Symposium, Ottawa, June 2002. pdf
Hanna Linder, Dipankar Sarma and Maneesh Soni, Scalability of the Directory Entry Cache, Proceedings of Ottawa Linux Symposium, Ottawa, June 2002. pdf
Paul E. McKenney, Jonathan Appavoo, Andi Kleen, Orran Krieger, Rusty Russell, Dipankar Sarma and Maneesh Soni, Read-Copy Update, Proceedings of Ottawa Linux Symposium, Ottawa, July 2001. pdf
My issued patents are listed here.