build1 publisher
Dirtying all of a 64 GB heap during a fork snapshot costs 16.8 million page faults
A dev.to walkthrough traces fork() from the cleared write bit in every PTE down to do_wp_page, where a refcount check decides whether a snapshot window costs a 4 KiB copy for each dirtied page or nothing at all.
Publishers:dev.to
Reality
- Evidence48
- Adoption
- Insufficient
- Hype gap+35
- Incentives20
- Confidence46