On Tue, 5 Sep 2017, Randy Dunlap wrote: > On 09/05/17 15:53, Andrew Morton wrote: > > On Tue, 5 Sep 2017 22:05:00 +0300 Alexey Dobriyan <adobriyan@xxxxxxxxx> wrote: > > > >> Implement system call for bulk retrieveing of pids in binary form. > >> > >> Using /proc is slower than necessary: 3 syscalls + another 3 for each thread + > >> converting with atoi(). > >> > >> /proc may be not mounted especially in containers. Natural extension of > >> hidepid=2 efforts is to not mount /proc at all. > >> > >> It could be used by programs like ps, top or CRIU. Speed increase will > >> become more drastic once combined with bulk retrieval of process statistics. > > > > The patches are performance optimizations, but their changelogs contain > > no performance measurements! > > > > Demonstration of some compelling real-world performance benefits would > > help things along a lot. > > > > also, I expect that the tiny kernel people will want kconfig options for > these syscalls. And of course that stuff wants the corresponding man pages written up. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
