Hi! Am 15.07.2016 um 12:35 schrieb Topi Miettinen: > Hello, > > There are many basic ways to control processes, including capabilities, > cgroups and resource limits. However, there are far fewer ways to find out > useful values for the limits, except blind trial and error. > > This patch series attempts to fix that by giving at least a nice starting > point from the highwater mark values of the resources in question. > I looked where each limit is checked and added a call to update the mark > nearby. > > Example run of program from Documentation/accounting/getdelauys.c: > > ./getdelays -R -p `pidof smartd` > printing resource accounting > RLIMIT_CPU=0 > RLIMIT_FSIZE=0 > RLIMIT_DATA=18198528 > RLIMIT_STACK=135168 > RLIMIT_CORE=0 > RLIMIT_RSS=0 > RLIMIT_NPROC=1 > RLIMIT_NOFILE=55 > RLIMIT_MEMLOCK=0 > RLIMIT_AS=130879488 > RLIMIT_LOCKS=0 > RLIMIT_SIGPENDING=0 > RLIMIT_MSGQUEUE=0 > RLIMIT_NICE=0 > RLIMIT_RTPRIO=0 > RLIMIT_RTTIME=0 > > ./getdelays -R -C /sys/fs/cgroup/systemd/system.slice/smartd.service/ > printing resource accounting > sleeping 1, blocked 0, running 0, stopped 0, uninterruptible 0 > RLIMIT_CPU=0 > RLIMIT_FSIZE=0 > RLIMIT_DATA=18198528 > RLIMIT_STACK=135168 > RLIMIT_CORE=0 > RLIMIT_RSS=0 > RLIMIT_NPROC=1 > RLIMIT_NOFILE=55 > RLIMIT_MEMLOCK=0 > RLIMIT_AS=130879488 > RLIMIT_LOCKS=0 > RLIMIT_SIGPENDING=0 > RLIMIT_MSGQUEUE=0 > RLIMIT_NICE=0 > RLIMIT_RTPRIO=0 > RLIMIT_RTTIME=0 > > In this example, smartd is running as a non-root user. The presented > values can be used as a starting point for giving new limits to the > service. I don't think it is worth sprinkling the kernel with update_resource_highwatermark() calls just to get these metrics. Can't we teach the existing perf infrastructure to collect these highwatermarks for us? Thanks, //richard -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>