Application performance degradation on cgroup2

Issue

• Application performance degradation happens on cgroup2.
• Perf report shows the spin_lock contention is in observation from cgroup_rstat_flush_irqsafe.

  Overhead       sys       usr  Shared Object                                   
-   68.61%    68.61%     0.00%  [kernel.vmlinux]                               ▒
   + 33.54% acpi_processor_ffh_cstate_enter                                    ▒
   - 6.17% native_queued_spin_lock_slowpath                                    ▒
      - 5.72% _raw_spin_lock_irqsave                                           ▒
         - 5.56% cgroup_rstat_flush_irqsafe                                    ▒
            - mem_cgroup_wb_stats                                              ▒
               - 5.55% wb_over_bg_thresh                                       ▒
                  + 3.51% wb_workfn                                            ▒
                  + 2.04% wb_writeback                                         ▒
   + 3.76% update_blocked_averages                                             ▒
   + 1.04% __update_load_avg_cfs_rq                                            ▒
   + 0.88% copy_user_enhanced_fast_string                                      ▒
   + 0.85% __d_lookup_rcu                                                      ▒
   + 0.60% update_sd_lb_stats.constprop.121                                    ▒