81d66fab34
One thing that came out of the test week is that systoomd needs to poll more frequently so as not to race with the kernel oom killer in situations where memory is eaten quickly. Memory pressure counters are lagging so it isn't worthwhile to change the current read rate; however swap is not lagging and can be checked more frequently. So let's split these into 2 different timer events. As a result, swap now also doesn't have to be subject to the post-action (post-kill) delay that we need for memory pressure events. Addresses some of slowness to kill discussed in https://bugzilla.redhat.com/show_bug.cgi?id=1941340
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