On Tue, 4 Oct 2022 at 12:34, Amir Goldstein <amir73il@xxxxxxxxx> wrote: > > Miklos, > > I ran into an incident of very large index dir which took considerable > amount of time to mount the indexed overlay (~30 minutes). > The index dir had millions of entries and I do not think that the use > case that caused this is typical. > > The following two patches are based on perf top analysis of this > incident. I do not have access to the data set that caused the > very long mount time, but I tested the desired CPU usage improvements > on a smaller scale data set. > > It is hard to say if this extreme case of very large index dir is > common enough to be worth any attention, so I did not tag the fixes > for stable and I don't think it is urgent to apply them. > > Unfortunattely, the investigation of the incident was not timed > optimally w.r.t. to the current merge window. > Nevertheless, the changes are quite trivial, so you may want to consider > them either for -rc or for next release. Looks good. Pushed to #overlayfs-next. Thanks, Miklos
