On Mon, 2023-09-25 at 12:41 +0200, Ilya Dryomov wrote: > On Fri, Sep 22, 2023 at 8:26 AM Max Kellermann <max.kellermann@xxxxxxxxx> wrote: > > > > I'd like to be able to run metrics collector processes without special > > privileges > > Hi Max, > > A word of caution about building metrics collectors based on debugfs > output: there are no stability guarantees. While the format won't be > changed just for the sake of change of course, expect zero effort to > preserve backwards compatibility. > > The latency metrics in particular are sent to the MDS in binary form > and are intended to be consumed through commands like "ceph fs top". > debugfs stuff is there just for an occasional sneak peek (apart from > actual debugging). > FWIW, I wish we had gone with netlink for this functionality instead of a seqfile. Lorenzo has been working with netlink for some similar functionality with nfsd[1], and it's much nicer for this sort of thing. [1]: https://lore.kernel.org/linux-nfs/ZQTM6l7NrsVHFoR5@lore-desk/T/#t -- Jeff Layton <jlayton@xxxxxxxxxx>
