On 10/30, Bart Van Assche wrote: > On 10/30/24 10:14 AM, Christoph Hellwig wrote: > > On Wed, Oct 30, 2024 at 09:59:24AM -0700, Bart Van Assche wrote: > > > > > > On 10/29/24 9:55 PM, Christoph Hellwig wrote: > > > > For the temperature hints the only public user I known is rocksdb, and > > > > that only started working when Hans fixed a brown paperbag bug in the > > > > rocksdb code a while ago. Given that f2fs interprets the hints I suspect > > > > something in the Android world does as well, maybe Bart knows more. > > > > > > UFS devices typically have less internal memory (SRAM) than the size of a > > > single zone. > > > > That wasn't quite the question. Do you know what application in android > > set the fcntl temperature hints? > > I do not know whether there are any Android apps that use the > F_SET_(FILE_|)RW_HINT fcntls. > > The only use case in Android platform code I know of is this one: Daejun > Park, "f2fs-tools: add write hint support", f2fs-dev mailing list, > September 2024 (https://lore.kernel.org/all/20240904011217epcms2p5a1b15db8e0ae50884429da7be4af4de4@epcms2p5/T/). > As you probably know f2fs-tools is a software package that includes > fsck.f2fs. > > Jaegeuk, please correct me if necessary. Yes, f2fs-tools in Android calls fcntl(fd, F_SET_RW_HINT, &hint); > > Bart. > >
