"Patrick J. LoPresti" <lopresti@xxxxxxxxx> writes: > > 1) Anybody who cares about file system performance is already using > "noatime" or "relatime", which mitigates the hit greatly. Consider mtime. > If the above patch is too slow for some architectures, how about > making it a configuration option? Call it "CONFIG_1980S_FILE_TICK", > have it default to YES on the architectures that care and NO on > anything remotely modern and sane. > > OK that's my proposal. Bash away. I suspect it will be a performance disaster on x86 for VFS intensive applications on capable file systems. VFS is very performance critical. These checks lurk on unexpected places too, e.g. on /dev access. Even TSC is much slower than just reading the variable. Also you should check if the file system granuality even supports it, it's completely wasted on a ext3 for example. Maybe as a optional sysctl, default to off. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
