Messages in this thread | | | Date | Thu, 13 Apr 2017 12:03:43 -0400 | From | Johannes Weiner <> | Subject | Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup |
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On Thu, Mar 30, 2017 at 09:48:55AM -0700, Shakeel Butt wrote: > > A more useful metric for memory pressure at this point is quantifying > > that time you spend thrashing: time the job spends in direct reclaim > > and on the flipside time the job waits for recently evicted pages to > > come back. Combined, that gives you a good measure of overhead from > > memory pressure; putting that in relation to a useful baseline of > > meaningful work done gives you a portable scale of how effictively > > your job is running. > > > > I'm working on that right now, hopefully I'll have something useful > > soon. > > Johannes, is the work you are doing only about file pages or will it > equally apply to anon pages as well?
It will work on both, with the caveat that *any* swapin is counted as memory delay, whereas only cache misses of recently evicted entries count toward it (we don't have timestamped shadow entries for anon).
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