Messages in this thread | | | Date | Wed, 18 Jan 2023 09:15:34 -0800 | From | Minchan Kim <> | Subject | Re: [PATCH 3/3] mm: add vmstat statistics for madvise_[cold|pageout] |
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On Wed, Jan 18, 2023 at 10:11:46AM +0100, Michal Hocko wrote: > On Tue 17-01-23 15:16:32, Minchan Kim wrote: > > madvise LRU manipulation APIs need to scan address ranges to find > > present pages at page table and provides advice hints for them. > > > > Likewise pg[scan/steal] count on vmstat, madvise_pg[scanned/hinted] > > shows the proactive reclaim efficiency so this patch addes those > > two statistics in vmstat. > > Please describe the usecase for those new counters.
I wanted to know the proactive reclaim efficieny using MADV_COLD/MDDV_PAGEOUT. Userspace has several policy which when/which vmas need to be hinted by the call and they are evolving. I needed to know how effectively their policy works since the vma ranges are huge(i.e., nr_hinted/nr_scanned).
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