Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> writes: > On 2017/11/08 18:18, Dmitry Monakhov wrote: >> Our systems becomes bigger and bigger, but OOM still happens. >> This becomes serious problem for systems where OOM happens >> frequently(containers, VM) because each OOM generate pressure >> on dmesg log infrastructure. Let's allow system administrator >> ability to tune OOM dump behaviour > > Majority of OOM killer related messages are from dump_header(). > Thus, allow tuning __ratelimit(&oom_rs) might make sense. > > But other lines > > "%s: Kill process %d (%s) score %u or sacrifice child\n" > "Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n" > "oom_reaper: reaped process %d (%s), now anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n" This still may result in hundreds of messages per second. So it would be nice to have option to disable OOM logging. > should not cause problems, for it is easy to exclude such lines from > your dmesg log infrastructure using fgrep match. In fact I've considered an abbility to use even more fine grained log level control: 0: no oom log at all 1: dump only single line logs ( from oom_kill_process and reaper_task) 2: 1+ dump headers 3: 2+ task_stack (which previously controlled by sysctl_oom_dump_task) What do you think? > > -- > 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> -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
