On 10/12/21 20:35, Daniel Hoffman wrote: > In the Linux Kconfig documentation for memory compaction, you mention > that almost nobody should turn the option off, and if so that you'd > like to hear about why at this email address. > > Has anybody email'd you to explain why they'd need it turned off? I'm I don't personally recall about a mail triggered specifically by this kconfig hint. There have been cases where people complained about high overhead (e.g. CPU usage) which was sometimes due to bugs. A common non-bug reason for high usage has been transparent hugepages (THP). The default settings for THPs today should mean that compaction will not be tried as hard in that context, but many people also learned from various old blogs that they should be disabling THP altogether and keep doing it. > doing R&D in this area and understanding these edge cases (if they > exist) would be great. > > Thanks! > > > Screenshot from 2021-10-12 13-35-03.png >
