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i5JrJFd8xruMpc/9tTUzljsxk8oO6gIslUVNX+79jfBo+60ZDMOAdI6qwNhxSJ8Lp7pnx3ZJbx7Pfm1bDTghhr+r4EoBaDtnhVyu26P/7FOx5hpxYcb95+XFk+dHHSsXy8SNTNthy9PyH3O9hwrG/mRBC/gGe9bFJv5MvglL7k8ZbUoOgz9TWaYslF0yU2Hc2IqvFGwWIicUuk4qlDrk3qU42DBmdyP7NTrMLr+ro0ejkCZKtbyyzvC8KoNJoS0TCbvEQrB4nH2k5vUY55FGI/c42PX7DMc/O11k1ZwllLWiX75g+k9czvYy371iKzKPqgJ+HCVCZjZzUF7o6GVhlS0bnW0xmnJ4omcEz 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: On 7/17/23 08:35, Yu Zhao wrote: > On Sun, Jul 16, 2023 at 6:00 PM Yin, Fengwei wrote: >> >> On 7/15/2023 2:06 PM, Yu Zhao wrote: >>> There is a problem here that I didn't have the time to elaborate: we >>> can't mlock() a folio that is within the range but not fully mapped >>> because this folio can be on the deferred split queue. When the split >>> happens, those unmapped folios (not mapped by this vma but are mapped >>> into other vmas) will be stranded on the unevictable lru. >> >> This should be fine unless I missed something. During large folio split, >> the unmap_folio() will be migrate(anon)/unmap(file) folio. Folio will be >> munlocked in unmap_folio(). So the head/tail pages will be evictable always. > > It's close but not entirely accurate: munlock can fail on isolated folios. I suppose normal 4K page can hit this problem also and following patch could fix it: diff --git a/mm/vmscan.c b/mm/vmscan.c index 1080209a568bb..839b8398aa613 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2498,7 +2498,7 @@ static unsigned int move_folios_to_lru(struct lruvec *lruvec, VM_BUG_ON_FOLIO(folio_test_lru(folio), folio); list_del(&folio->lru); - if (unlikely(!folio_evictable(folio))) { + if (unlikely(!folio_evictable(folio) || folio_test_unevictable(folio))) { spin_unlock_irq(&lruvec->lru_lock); folio_putback_lru(folio); spin_lock_irq(&lruvec->lru_lock); @@ -2723,7 +2723,7 @@ static void shrink_active_list(unsigned long nr_to_scan, folio = lru_to_folio(&l_hold); list_del(&folio->lru); - if (unlikely(!folio_evictable(folio))) { + if (unlikely(!folio_evictable(folio) || folio_test_unevictable(folio))) { folio_putback_lru(folio); continue; } @@ -5182,7 +5182,7 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap sc->nr_reclaimed += reclaimed; list_for_each_entry_safe_reverse(folio, next, &list, lru) { - if (!folio_evictable(folio)) { + if (!folio_evictable(folio) || folio_test_unevictable(folio)) { list_del(&folio->lru); folio_putback_lru(folio); continue; Regards Yin, Fengwei