Optimization updating memory usage via mincore syscall is expensive

When sentry update memory usage, mincore syscall will be used to check whether pages are resident in memory, this is expensive for CPU utilization, because syscall in sentry kernel will invoke a vmexit and kernel syscall.

Mincore syscall will cause about 1%~%5 CPU utilization in all Guest ring 0 and Host ring 0 CPU utilization of our Java / Go application container.