On 1 June 2015 at 09:03, Umut Tezduyar Lindskog <[email protected]> wrote: > On Fri, May 29, 2015 at 12:25 PM, Lennart Poettering > <[email protected]> wrote: >> On Fri, 29.05.15 00:24, Dimitri John Ledkov ([email protected]) >> wrote: >> >>> On 28 May 2015 at 18:08, Lennart Poettering <[email protected]> wrote: >>> > On Thu, 28.05.15 16:42, Dimitri John Ledkov ([email protected]) >>> > wrote: >>> > >>> >> It appears in /proc/self/cgroup as `0::/' >>> > >>> > What precisely does this fix? >>> > >>> > I mean, we need to do some major rework of things before the unified >>> > hierarchy is really supported in systemd, and this one thing won't >>> > really get us too much in this regard, does it? >>> > >>> >>> I'm starting to explore possibilities to start work towards supporting >>> unified cgroups hierarchy, or at least be able to boot with it. I'll >>> send a larger patch series in one go later than with all the bits that >>> offer something more tangible, albeit disabled by default behind >>> configure options (like kdbus) given that unified hierarchy is still >>> marked experimental in the kernel. >> >> Ah, it's actually my big thing to work on for the next weeks too... > > What is the advantage of having a unified hierarchy, could you guys explain?
There are a few. Read more in the linux documentation: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/Documentation/cgroups/unified-hierarchy.txt For me, I'm spending a lot of time during boot forking cgroups release agent user-space binary, which establishes IPC connection to systemd to notify that a cgroup was released. And essentially oneshot services during boot pay sequential price of executing two processes rather than just one. Hence exposure of cgroups.populated field is very desirable for me. Currently only available on the unified hierarchy, but I'm not sure why it couldn't be enabled on the old one, given that it is forward compatible. -- Regards, Dimitri. Pura Vida! https://clearlinux.org Open Source Technology Center Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ. _______________________________________________ systemd-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/systemd-devel
