Thanks for sharing in this detail. I don't have production SRE experience, so this is fascinating to read. I understand that the OOM killer has caused you quite

Thanks for sharing in this detail. I don't have production SRE experience, so this is fascinating to read. I understand that the OOM killer has caused you quite a lot of pain! I shouldn't have even mentioned the OOM killer. My point was merely: Due to those great lengths, memory availability is highly dynamic. Committing memory up front prevents optimizations where the kernel can reclaim memory "just in time" to allow a mapping to succeed and not require killing anything.