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to having >>>>> originally sent >>>>> it during LPC. I'm hoping its in a position where the feedback is >>>>> minor enough >>>>> that I can rework in time for v6.8, but so far haven't had any. >>>>> >>>>> Hi All, >>>>> >>>>> This is v7 of a series to implement small-sized THP for anonymous >>>>> memory >>>>> (previously called "large anonymous folios"). The objective of this >>>>> is to >>>> >>>> I'm still against small-sized THP.  We've now got people asking whether >>>> the THP counters should be updated when dealing with large folios that >>>> are smaller than PMD sized.  It's sowing confusion, and we should go >>>> back to large anon folios as a name. >>>> >>> >>> I disagree. >>> >>> https://lore.kernel.org/all/65dbdf2a-9281-a3c3-b7e3-a79c5b60b357@redhat.com/ >> >> And yet: >> https://lore.kernel.org/linux-mm/20231106193315.GB3661273@cmpxchg.org/ >> >> "This is a small THP so we don't account it as a THP, we only account >> normal THPs as THPs" is a bizarre position to take. >> >> Not to mention that saying a foo is a small huge baz is just bizarre. >> Am I a small giant?  Or just a large human? > > I like that analogy. Yet, "small giant" sounds "bigger" in some way IMHO ;) > > I'll note that "small-sized THP" is just a temporary feature name, it > won't be exposed as such to the user in sysfs etc. In a couple of years, > it will be forgotten. > > To me it makes sense: it's a hugepage (not a page) but smaller compared > to what we previously had. But again, there won't be a "small_thp" > toggle anywhere. > > Long-term it's simply going to be a THP. Quoting from my writeup: > > "Nowadays, when somebody says that they are using hugetlb huge pages, > the first question frequently is "which huge page size?". The same will > happen with transparent huge pages I believe.". > > > Regarding the accounting: as I said a couple of times, "AnonHugePages" > should have been called "AnonPmdMapped" or similar; that's what it > really is: as soon as a THP is PTE-mapped, it's not accounted there. But > we can't fix that I guess, unless we add some "world switch" for any > workloads that would care about a different accounting. > > So we're really only concerned about: > * AnonHugePages > * ShmemHugePages > * FileHugePages The v6 patchset had these counters: /proc/vmstat: nr_anon_thp_pte /proc/meminfo: AnonHugePteMap ...which leads to another naming possibility: pte-thp, or pte-mapped-thp, something along those lines. pte-thp avoids the "small huge" complaint, at least. thanks, -- John Hubbard NVIDIA