On Tue, 10 Apr 2018 10:32:36 +0800 Zhaoyang Huang <huangzhaoy...@gmail.com> wrote:
> For bellowing scenario, process A have no intension to exhaust the > memory, but will be likely to be selected by OOM for we set > OOM_CORE_ADJ_MIN for it. > process A(-1000) process B > > i = si_mem_available(); > if (i < nr_pages) > return -ENOMEM; > schedule > ---------------> > allocate huge memory > <------------- > if (user_thread) > set_current_oom_origin(); > > for (i = 0; i < nr_pages; i++) { > bpage = kzalloc_node Is this really an issue though? Seriously, do you think you will ever hit this? How often do you increase the size of the ftrace ring buffer? For this to be an issue, the system has to trigger an OOM at the exact moment you decide to increase the size of the ring buffer. That would be an impressive attack, with little to gain. Ask the memory management people. If they think this could be a problem, then I'll be happy to take your patch. -- Steve