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EoUBQH5EVsMyj8+Uvgx+HkZnP7b3E/V7JHK1K9mxNX/LIbk/Fw7iKNzAxJvqLS3CFbZCtHyaamjV/fNbtM4INQ5zYd1J84kdeI1buqpdXRmrR64Pr7IYXSondjCEyZZV2pfPiPxHp+SiFueIfXzaPJlArPfHmryYM7+B9hocL73GURXCfjT+qjrhXgD83DFtNfEPKu/W5Gx57lHsPyVfWTN3Orcn7BMUPUjewkkVenK7liHh3ur8XF2BDn0/nbx8/ahBgGmximuMxenOQMHmVCArHVXZaCn4/cqfFDdjNYEBQ5hh17MJcMRyzOfNZjZE3U0c3kRFjOGmx9Aw= 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: >> - if (pageout_anon_only_filter && !folio_test_anon(folio)) >> + /* Do not interfere with other mappings of this folio */ >> + if (folio_mapcount(folio) != 1) >> continue; >> >> - VM_BUG_ON_FOLIO(folio_test_large(folio), folio); >> - >> - if (pte_young(ptent)) { >> - ptent = ptep_get_and_clear_full(mm, addr, pte, >> - tlb->fullmm); >> - ptent = pte_mkold(ptent); >> - set_pte_at(mm, addr, pte, ptent); >> - tlb_remove_tlb_entry(tlb, pte, addr); >> - } >> - >> - /* >> - * We are deactivating a folio for accelerating reclaiming. >> - * VM couldn't reclaim the folio unless we clear PG_young. >> - * As a side effect, it makes confuse idle-page tracking >> - * because they will miss recent referenced history. >> - */ >> - folio_clear_referenced(folio); >> - folio_test_clear_young(folio); >> - if (folio_test_active(folio)) >> - folio_set_workingset(folio); >> +pageout_cold_folio: >> if (pageout) { >> if (folio_isolate_lru(folio)) { >> if (folio_test_unevictable(folio)) >> @@ -529,8 +542,30 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, >> arch_leave_lazy_mmu_mode(); >> pte_unmap_unlock(start_pte, ptl); >> } >> - if (pageout) >> - reclaim_pages(&folio_list); >> + >> + if (pageout) { >> + LIST_HEAD(reclaim_list); >> + >> + while (!list_empty(&folio_list)) { >> + int refs; >> + unsigned long flags; >> + struct mem_cgroup *memcg = folio_memcg(folio); >> + >> + folio = lru_to_folio(&folio_list); >> + list_del(&folio->lru); >> + >> + refs = folio_referenced(folio, 0, memcg, &flags); >> + >> + if ((flags & VM_LOCKED) || (refs == -1)) { >> + folio_putback_lru(folio); >> + continue; >> + } >> + >> + folio_test_clear_referenced(folio); >> + list_add(&folio->lru, &reclaim_list); >> + } >> + reclaim_pages(&reclaim_list); >> + } > > i overlooked the chunk above -- it's unnecessary: after we split the > large folio (and splice the base folios onto the same LRU list), we > continue at the position of the first base folio because of: > > pte--; > addr -= PAGE_SIZE; > continue; > > And then we do pte_mkold(), which takes care of the A-bit. This patch moves the A-bit clear out of the folio isolation loop. So even the folio is split and loop restarts from the first base folio, the A-bit is not cleared. A-bit is only cleared in reclaim loop. There is one option for A-bit clearing: - clear A-bit of base 4K page in isolation loop and leave large folio A-bit clearing to reclaim loop. This patch didn't use it because don't want to introduce A-bit clearing in two places. But I am open about clearing base 4K page A-bit cleared in isolation loop. Thanks. Regards Yin, Fengwei