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leillc@google.com, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mgorman@techsingularity.net, mingo@redhat.com, nadav.amit@gmail.com, nphamcs@gmail.com, peterz@infradead.org, riel@surriel.com, rientjes@google.com, rppt@kernel.org, santosh.shukla@amd.com, shivankg@amd.com, shy828301@gmail.com, sj@kernel.org, vbabka@suse.cz, weixugc@google.com, willy@infradead.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, Jonathan.Cameron@huawei.com, dave@stgolabs.net, yuanchu@google.com, kinseyho@google.com, hdanton@sina.com Subject: Re: [RFC PATCH V2 03/13] mm: Scan the mm and create a migration list Message-ID: References: <20250624055617.1291159-1-raghavendra.kt@amd.com> <20250624055617.1291159-4-raghavendra.kt@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SE2P216CA0162.KORP216.PROD.OUTLOOK.COM (2603:1096:101:2cb::7) To CH3PR10MB7329.namprd10.prod.outlook.com (2603:10b6:610:12c::16) MIME-Version: 1.0 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Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Jun 26, 2025 at 07:07:12AM +0900, Harry Yoo wrote: > On Tue, Jun 24, 2025 at 05:56:07AM +0000, Raghavendra K T wrote: > > Since we already have the list of mm_struct in the system, add a module to > > scan each mm that walks VMAs of each mm_struct and scan all the pages > > associated with that. > > > > In the scan path: Check for the recently acccessed pages (folios) belonging > > to slowtier nodes. Add all those folios to a list. > > > > Signed-off-by: Raghavendra K T > > --- > > Hi, just taking a quick look... > > > mm/kscand.c | 319 +++++++++++++++++++++++++++++++++++++++++++++++++++- > > 1 file changed, 318 insertions(+), 1 deletion(-) > > > > diff --git a/mm/kscand.c b/mm/kscand.c > > index d5b0d3041b0f..0edec1b7730d 100644 > > --- a/mm/kscand.c > > +++ b/mm/kscand.c > > @@ -42,6 +55,8 @@ static struct kmem_cache *kscand_slot_cache __read_mostly; > > @@ -84,11 +122,275 @@ static void kscand_wait_work(void) > > scan_sleep_jiffies); > > } > > > > +static inline bool is_valid_folio(struct folio *folio) > > +{ > > + if (!folio || folio_test_unevictable(folio) || !folio_mapped(folio) || > > + folio_is_zone_device(folio) || folio_maybe_mapped_shared(folio)) > > + return false; > > + > > + return true; > > +} > > What makes it undesirable to migrate shared folios? > > > +static bool folio_idle_clear_pte_refs_one(struct folio *folio, > > + struct vm_area_struct *vma, > > + unsigned long addr, > > + pte_t *ptep) > > +{ > > + bool referenced = false; > > + struct mm_struct *mm = vma->vm_mm; > > + pmd_t *pmd = pmd_off(mm, addr); > > + > > + if (ptep) { > > + if (ptep_clear_young_notify(vma, addr, ptep)) > > + referenced = true; > > + } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { > > + if (!pmd_present(*pmd)) > > + WARN_ON_ONCE(1); > > + if (pmdp_clear_young_notify(vma, addr, pmd)) > > + referenced = true; > > + } else { > > + WARN_ON_ONCE(1); > > + } > > This does not look good. > > I think pmd entry handling should be handled in > mm_walk_ops.pmd_entry callback? > > > + > > + if (referenced) { > > + folio_clear_idle(folio); > > + folio_set_young(folio); > > + } > > + > > + return true; > > +} > > + > > +static void page_idle_clear_pte_refs(struct page *page, pte_t *pte, struct mm_walk *walk) > > +{ > > + bool need_lock; > > + struct folio *folio = page_folio(page); > > + unsigned long address; > > + > > + if (!folio_mapped(folio) || !folio_raw_mapping(folio)) > > + return; > > + > > + need_lock = !folio_test_anon(folio) || folio_test_ksm(folio); > > + if (need_lock && !folio_trylock(folio)) > > + return; > > Why acquire folio lock here? > > And I'm not even sure if it's safe to acquire it? > The locking order is folio_lock -> pte_lock > > page walk should have already acquired pte_lock before calling > ->pte_entry() callback. Oops, it's trylock. Nevermind. Needed more coffee in the morning :) > > + address = vma_address(walk->vma, page_pgoff(folio, page), compound_nr(page)); > > + VM_BUG_ON_VMA(address == -EFAULT, walk->vma); > > + folio_idle_clear_pte_refs_one(folio, walk->vma, address, pte); > > + > > + if (need_lock) > > + folio_unlock(folio); > > +} > > + > > +static const struct mm_walk_ops hot_vma_set_idle_ops = { > > + .pte_entry = hot_vma_idle_pte_entry, > > + .walk_lock = PGWALK_RDLOCK, > > +}; > > + > > +static void kscand_walk_page_vma(struct vm_area_struct *vma, struct kscand_scanctrl *scanctrl) > > +{ > > + if (!vma_migratable(vma) || !vma_policy_mof(vma) || > > + is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) { > > + return; > > + } > > + if (!vma->vm_mm || > > + (vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ))) > > + return; > > Why not walk writable file VMAs? > > > + if (!vma_is_accessible(vma)) > > + return; > > + > > + walk_page_vma(vma, &hot_vma_set_idle_ops, scanctrl); > > +} > > -- > Cheers, > Harry / Hyeonggon -- Cheers, Harry / Hyeonggon