[LU-18710] mmap traffic isn't reflected in the llite stats file

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Yaki Tebeka

Description

NVIDIA Nsight Systems is a system wide profiler. It reads performance counters coming from CPUs, GPUs, NICs, storage volumes, etc. and brings all data to a unified timeline. This helps software developers see how their application executes over a server, to be able to optimize the application's performance.

Additional details are at:

• https://developer.nvidia.com/nsight-systems 
• https://docs.nvidia.com/nsight-systems/UserGuide/index.html 

Nsight Systems reads Lustre client performance counters from /sys/kernel/debug/lustre/llite/<volume name>/stats

However, when data is read/written to a file mapped to memory using mmap, the traffic isn't reflected in the stats file.

Issue Links

• is related to: LU-18712 Application and Driver level client counters