On Thu, May 01, 2025 at 12:08:54PM +0800, xu.xin16@xxxxxxxxxx wrote: > From: xu xin <xu.xin16@xxxxxxxxxx> > > With the enablement of container-level KSM (e.g., via prctl [1]), there is > a growing demand for container-level observability of KSM behavior. However, > current cgroup implementations lack support for exposing KSM-related > metrics. > > This patch introduces a new interface named ksm_stat > at the cgroup hierarchy level, enabling users to monitor KSM merging > statistics specifically for containers where this feature has been > activated, eliminating the need to manually inspect KSM information for > each individual process within the cgroup. > > Users can obtain the KSM information of a cgroup just by: > > # cat /sys/fs/cgroup/memory.ksm_stat > ksm_rmap_items 76800 > ksm_zero_pages 0 > ksm_merging_pages 76800 > ksm_process_profit 309657600 > > Current implementation supports both cgroup v2 and cgroup v1. > Before adding these stats to memcg, add global stats for them in enum node_stat_item and then you can expose them in memcg through memory.stat instead of a new interface.
