On Mon, 26.03.12 11:06, Albert Strasheim (full...@gmail.com) wrote: > Hello all > > We want to limit the memory a service can use using MemoryLimit= and > MemorySoftLimit= described in systemd.exec. > > As I understand it, LimitAS= and LimitRSS= aren't particularly useful. > Linux doesn't even implement LimitRSS?
LimitXXX act per-process, not per-service, the way MemoryLimit= does. And yeah, not all LimiXXX actually make a lot of sense on Linux. See http://www.kernel.org/doc/Documentation/cgroups/memory.txt for more information how MemoryLimit= and MemorySoftLimit= work. > Is there a way for an application to detect when it has hit its > MemorySoftLimit=? We would like to log a warning at this point. I am not aware that we had any infrastructure for notification of userspace on memory suppression situations. > Also, is there some standard way for the app[M#O7lication to determine if a > MemoryLimit= is configured? We might want to automatically size some > buffers based on this limit. You can read /proc/self/cgroup. Find the line with ":memory:" there, then extract the path after the second ":". Then use that path under /sys/fs/cgroup/memory and read the "memory.soft_limit_in_bytes" file in it. Lennart -- Lennart Poettering - Red Hat, Inc. _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
