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 cbAGdV/B 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8 Apr 2025, at 12:02, Johannes Weiner wrote: > On Tue, Apr 08, 2025 at 11:29:43AM -0400, Zi Yan wrote: >> On 8 Apr 2025, at 9:16, Baolin Wang wrote: >> >>> When investigating performance issues during file folio unmap, I notice= d some >>> behavioral differences in handling non-PMD-sized folios and PMD-sized f= olios. >>> For non-PMD-sized file folios, it will call folio_mark_accessed() to ma= rk the >>> folio as having seen activity, but this is not done for PMD-sized folio= s. >>> >>> This might not cause obvious issues, but a potential problem could be t= hat, >>> it might lead to more frequent refaults of PMD-sized file folios under = memory >>> pressure. Therefore, I am unsure whether the folio_mark_accessed() shou= ld be > > Acked-by: Johannes Weiner > >> How likely will the system get PMD-sized file folios when it is under >> memory pressure? Johannes=E2=80=99 recent patch increases THP allocation= successful >> rate, maybe it was not happening before but will be after the patch? > > It's not so much about whether the refault can construct a THP again, > but whether we should have evicted this data under pressure to begin > with. It's more about IO and paging. And it's the same consideration > why we transfer the young bit for base pages. Got it. It clarifies things a lot. > > Sometimes file contents are only accessed through relatively > short-lived mappings. But they can nevertheless be accessed a lot and > be hot. It's important to not lose that information on unmap, and end > up kicking out a frequently used cache page. So folio_mark_accessed() will prevent the folio from going down in the LRU lists, when PTE access information is transferred to the folio. The addition of folio_mark_accessed() makes sense to me now. Baolin, can you include Johannes=E2=80=99s explanation in your commit log? Feel free to add Acked-by: Zi Yan > >>> added for PMD-sized file folios? >> >> Do you see any performance change after your patch? >> >>> >>> Signed-off-by: Baolin Wang >>> --- >>> mm/huge_memory.c | 4 ++++ >>> 1 file changed, 4 insertions(+) >>> >>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >>> index 6ac6d468af0d..b3ade7ac5bbf 100644 >>> --- a/mm/huge_memory.c >>> +++ b/mm/huge_memory.c >>> @@ -2262,6 +2262,10 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct = vm_area_struct *vma, >>> zap_deposited_table(tlb->mm, pmd); >>> add_mm_counter(tlb->mm, mm_counter_file(folio), >>> -HPAGE_PMD_NR); >>> + >>> + if (flush_needed && pmd_young(orig_pmd) && >>> + likely(vma_has_recency(vma))) >>> + folio_mark_accessed(folio); >>> } >>> >>> spin_unlock(ptl); >>> --=20 >>> 2.43.5 Best Regards, Yan, Zi