On Thu, Nov 22, 2018 at 08:41:15PM +0800, Gao Xiang wrote: > Hi Greg, > > On 2018/11/22 20:26, Greg Kroah-Hartman wrote: > > Ugh, every page? Ok, nevermind, I take back my objections. You all are > > crazy and need to do crazy things like this :) > > ...Do you have some idea about this? ... I think it is fairly normal... :( > > We have a large number of managed workgroups, the current use case is the 4k compressed size, > each compressed page has a workgroup, but erofs also has reclaim paths to free them for low memory cases. > > But since the structure (z_erofs_vle_workgroup, erofs_workgroup) is critical, > I need to make it as small as possible. I do not know "real" filesystems (i.e. ones that put stuff on disks), only virtual ones (like sysfs/kernfs), so I do not know what to suggest here, sorry. I thought this was a much higner-level structure, if this is per-compressed-page, then you are more than welcome to optimize for this. Good luck with your "fake" spinlocks though :) thanks, greg k-h _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
