On 6/11/25 2:57 AM, Christoph Hellwig wrote: > On Tue, Jun 10, 2025 at 04:57:32PM -0400, Mike Snitzer wrote: >> Add 'enable-dontcache' to NFSD's debugfs interface so that: Any data >> read or written by NFSD will either not be cached (thanks to O_DIRECT) >> or will be removed from the page cache upon completion (DONTCACHE). >> >> enable-dontcache is 0 by default. It may be enabled with: >> echo 1 > /sys/kernel/debug/nfsd/enable-dontcache > > Having this as a global debug-only interface feels a bit odd. This interface is temporary. We expect to implement export options to control it if that turns out to be necessary. I don't feel we understand the full performance implications for most workloads yet, so it seems premature to design and introduce a permanent administrative interface. -- Chuck Lever
