On Thu, Jan 28, 2021 at 02:49:34AM -0800, Saravanan D wrote:

One of the many lasting (as we don't coalesce back) sources for huge page
splits is tracing as the granular page attribute/permission changes would
force the kernel to split code segments mapped to huge pages to smaller
ones thereby increasing the probability of TLB miss/reload even after
tracing has been stopped.

You didn't answer my question.

Is this tracing of userspace programs causing splits, or is it kernel
tracing?  Also, we have lots of kinds of tracing these days; are you
referring to kprobes?  tracepoints?  ftrace?  Something else?