On Fri, Aug 19, 2022 at 10:08:59AM -0700, Shakeel Butt wrote: > On Fri, Aug 19, 2022 at 9:29 AM Tejun Heo <tj@xxxxxxxxxx> wrote: > > > > On Fri, Aug 19, 2022 at 07:29:22PM +0800, zhaoyang.huang wrote: > > > From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx> > > > > > > It is observed in android system where per-app cgroup is demanded by freezer > > > subsys and part of groups require memory control. The hierarchy could be simplized > > > as bellowing where memory charged on group B abserved while we only want have > > > group E's memory be controlled and B's descendants compete freely for memory. > > > This should be the consequences of unified hierarchy. > > > Under this scenario, less efficient memory reclaim is observed when comparing > > > with no memory control. It is believed that multi LRU scanning introduces some > > > of the overhead. Furthermore, page thrashing is also heavier than global LRU > > > which could be the consequences of partial failure of WORKINGSET mechanism as > > > LRU is too short to protect the active pages. > > > > > > A(subtree_control = memory) - B(subtree_control = NULL) - C() > > > \ D() > > > - E(subtree_control = memory) - F() > > > \ G() > > > > > > Signed-off-by: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx> > > > > Just in case it wasn't clear. > > > > Nacked-by: Tejun Heo <tj@xxxxxxxxxx> > > > > Thanks. > > > > Was there a previous discussion on this? The commit message is unreadable. http://lkml.kernel.org/r/1660298966-11493-1-git-send-email-zhaoyang.huang@xxxxxxxxxx Thanks. -- tejun
