On 10/14/19 10:59 AM, Michal Hocko wrote: >> It's just a theory, but it's why I noted the number of cgroups when I >> initially saw this show up in profiles. > Yes, the cache traffic might be really high but I still find it a bit > surprising that it makes such a large footprint because this should be > mostly called from slow paths (reclaim) and the real work done should > just be larger - at least that's my intuition which might be quite off > here. How much is that 25% of the system time in the total time btw? The workload is a very read-heavy workload doing a lot of I/O. Basically all the threads are going into direct reclaim a *LOT*. The workload was roughly 50/50 user/kernel.
