On 01/17, Matthew Wilcox wrote: > On Fri, Jan 17, 2025 at 04:41:16PM +0000, Jaegeuk Kim wrote: > > If users clearly know which file-backed pages to reclaim in system view, they > > can use this ioctl() to register in advance and reclaim all at once later. > > > > To MM and others, > > > > I'd like to propose this API in F2FS only, since > > 1) the use-case is quite limited in Android at the moment. Once it's generall > > accepted with more use-cases, happy to propose a generic API such as fadvise. > > Please chime in, if there's any needs. > > > > 2) it's file-backed pages which requires to maintain the list of inode objects. > > I'm not sure this fits in MM tho, also happy to listen to any feedback. > > You didn't cc the patches to linux-mm, so that's a bad start. Because #1. > > I don't understand how this is different from MADV_COLD. Please > explain. MADV_COLD is a vma range, while this is a file range. So, it's more close to fadvise(POSIX_FADV_DONTNEED) which tries to reclaim the file-backed pages at the time when it's called. The idea is to keep the hints only, and try to reclaim all later when admin expects system memory pressure soon.
