Re: [systemd-devel] [RFE] distinguish reclaimable memory in `systemctl status` output
On Mo, 28.09.20 14:29, Vito Caputo (vcap...@pengaru.com) wrote: > Hello list, > > Inspired by recent, unnecessarily combative discussion on the list, I > thought I'd try restart this conversation anew: > > Is it possible to either add a reclaimable field the total memory line > of `systemctl status` output? > > Or perhaps a separate line like Memory-Reclaimable: ? > > Is additional kernel memcg support required to make this possible? > (I admittedly haven't made any effort to explore implementation yet) We can expose what the kernel provides us with. If the kernel already exposes this, we can certainly expose this as dbus property too. Plese file an RFE issue on github about that if so. Lennart -- Lennart Poettering, Berlin ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] [RFE] distinguish reclaimable memory in `systemctl status` output
On Tue, Sep 29, 2020 at 06:05:00PM +0200, Michal Koutný wrote: > On Mon, Sep 28, 2020 at 02:29:07PM -0700, Vito Caputo > wrote: > > Is it possible to either add a reclaimable field the total memory line > > of `systemctl status` output? > > > > Or perhaps a separate line like Memory-Reclaimable: ? > What would be the use of such an output? > Having some sense of how much memory is really free for application use including what's reclaimable is particularly valuable WRT understanding a service's proximity to OOM thresholds. > > Is additional kernel memcg support required to make this possible? > I think you can get a reasonable picture by checking memory.stat of > the given memory cgroup, however, I'm not sure it can be losslessly > translated into a single value like that. > Something approximate could be sufficient, even if it is lossy/racy. Cheers, Vito Caputo ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] [RFE] distinguish reclaimable memory in `systemctl status` output
On Mon, Sep 28, 2020 at 02:29:07PM -0700, Vito Caputo wrote: > Is it possible to either add a reclaimable field the total memory line > of `systemctl status` output? > > Or perhaps a separate line like Memory-Reclaimable: ? What would be the use of such an output? > Is additional kernel memcg support required to make this possible? I think you can get a reasonable picture by checking memory.stat of the given memory cgroup, however, I'm not sure it can be losslessly translated into a single value like that. Michal signature.asc Description: Digital signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
