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Message-ID: <20240807184730.1266736-2-ziy@nvidia.com>
Date: Wed, 7 Aug 2024 14:47:30 -0400
From: Zi Yan <ziy@...dia.com>
To: linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
David Hildenbrand <david@...hat.com>,
"Huang, Ying" <ying.huang@...el.com>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
linux-kernel@...r.kernel.org,
Zi Yan <ziy@...dia.com>
Subject: [PATCH 2/2] mm/migrate: move common code to numa_migrate_check (was numa_migrate_prep)
do_numa_page() and do_huge_pmd_numa_page() share a lot of common code. To
reduce redundancy, move common code to numa_migrate_prep() and rename
the function to numa_migrate_check() to reflect its functionality.
Now do_huge_pmd_numa_page() also checks shared folios to set TNF_SHARED
flag.
Suggested-by: David Hildenbrand <david@...hat.com>
Signed-off-by: Zi Yan <ziy@...dia.com>
---
mm/huge_memory.c | 14 ++-------
mm/internal.h | 5 ++--
mm/memory.c | 76 ++++++++++++++++++++++++------------------------
3 files changed, 44 insertions(+), 51 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a3c018f2b554..9b312cae6775 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1699,18 +1699,10 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
if (!folio)
goto out_map;
- /* See similar comment in do_numa_page for explanation */
- if (!writable)
- flags |= TNF_NO_GROUP;
-
nid = folio_nid(folio);
- /*
- * For memory tiering mode, cpupid of slow memory page is used
- * to record page access time. So use default value.
- */
- if (!folio_use_access_time(folio))
- last_cpupid = folio_last_cpupid(folio);
- target_nid = numa_migrate_prep(folio, vmf, haddr, nid, &flags);
+
+ target_nid = numa_migrate_check(folio, vmf, haddr, &flags, writable,
+ &last_cpupid);
if (target_nid == NUMA_NO_NODE)
goto out_map;
if (migrate_misplaced_folio_prepare(folio, vma, target_nid)) {
diff --git a/mm/internal.h b/mm/internal.h
index 52f7fc4e8ac3..fb16e18c9761 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1191,8 +1191,9 @@ void vunmap_range_noflush(unsigned long start, unsigned long end);
void __vunmap_range_noflush(unsigned long start, unsigned long end);
-int numa_migrate_prep(struct folio *folio, struct vm_fault *vmf,
- unsigned long addr, int page_nid, int *flags);
+int numa_migrate_check(struct folio *folio, struct vm_fault *vmf,
+ unsigned long addr, int *flags, bool writable,
+ int *last_cpupid);
void free_zone_device_folio(struct folio *folio);
int migrate_device_coherent_page(struct page *page);
diff --git a/mm/memory.c b/mm/memory.c
index 503d493263df..b093df652c11 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5368,16 +5368,43 @@ static vm_fault_t do_fault(struct vm_fault *vmf)
return ret;
}
-int numa_migrate_prep(struct folio *folio, struct vm_fault *vmf,
- unsigned long addr, int page_nid, int *flags)
+int numa_migrate_check(struct folio *folio, struct vm_fault *vmf,
+ unsigned long addr, int *flags,
+ bool writable, int *last_cpupid)
{
struct vm_area_struct *vma = vmf->vma;
+ /*
+ * Avoid grouping on RO pages in general. RO pages shouldn't hurt as
+ * much anyway since they can be in shared cache state. This misses
+ * the case where a mapping is writable but the process never writes
+ * to it but pte_write gets cleared during protection updates and
+ * pte_dirty has unpredictable behaviour between PTE scan updates,
+ * background writeback, dirty balancing and application behaviour.
+ */
+ if (!writable)
+ *flags |= TNF_NO_GROUP;
+
+ /*
+ * Flag if the folio is shared between multiple address spaces. This
+ * is later used when determining whether to group tasks together
+ */
+ if (folio_likely_mapped_shared(folio) && (vma->vm_flags & VM_SHARED))
+ *flags |= TNF_SHARED;
+ /*
+ * For memory tiering mode, cpupid of slow memory page is used
+ * to record page access time. So use default value.
+ */
+ if (folio_use_access_time(folio))
+ *last_cpupid = (-1 & LAST_CPUPID_MASK);
+ else
+ *last_cpupid = folio_last_cpupid(folio);
+
/* Record the current PID acceesing VMA */
vma_set_access_pid_bit(vma);
count_vm_numa_event(NUMA_HINT_FAULTS);
- if (page_nid == numa_node_id()) {
+ if (folio_nid(folio) == numa_node_id()) {
count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
*flags |= TNF_FAULT_LOCAL;
}
@@ -5442,13 +5469,13 @@ static void numa_rebuild_large_mapping(struct vm_fault *vmf, struct vm_area_stru
static vm_fault_t do_numa_page(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
+ pte_t old_pte = vmf->orig_pte;
+ pte_t pte;
struct folio *folio = NULL;
int nid = NUMA_NO_NODE;
bool writable = false, ignore_writable = false;
bool pte_write_upgrade = vma_wants_manual_pte_write_upgrade(vma);
- int last_cpupid;
- int target_nid;
- pte_t pte, old_pte;
+ int target_nid, last_cpupid = (-1 & LAST_CPUPID_MASK);
int flags = 0, nr_pages;
/*
@@ -5456,10 +5483,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
* table lock, that its contents have not changed during fault handling.
*/
spin_lock(vmf->ptl);
- /* Read the live PTE from the page tables: */
- old_pte = ptep_get(vmf->pte);
-
- if (unlikely(!pte_same(old_pte, vmf->orig_pte))) {
+ if (unlikely(!pte_same(old_pte, ptep_get(vmf->pte)))) {
pte_unmap_unlock(vmf->pte, vmf->ptl);
goto out;
}
@@ -5479,35 +5503,11 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
if (!folio || folio_is_zone_device(folio))
goto out_map;
- /*
- * Avoid grouping on RO pages in general. RO pages shouldn't hurt as
- * much anyway since they can be in shared cache state. This misses
- * the case where a mapping is writable but the process never writes
- * to it but pte_write gets cleared during protection updates and
- * pte_dirty has unpredictable behaviour between PTE scan updates,
- * background writeback, dirty balancing and application behaviour.
- */
- if (!writable)
- flags |= TNF_NO_GROUP;
-
- /*
- * Flag if the folio is shared between multiple address spaces. This
- * is later used when determining whether to group tasks together
- */
- if (folio_likely_mapped_shared(folio) && (vma->vm_flags & VM_SHARED))
- flags |= TNF_SHARED;
-
nid = folio_nid(folio);
nr_pages = folio_nr_pages(folio);
- /*
- * For memory tiering mode, cpupid of slow memory page is used
- * to record page access time. So use default value.
- */
- if (folio_use_access_time(folio))
- last_cpupid = (-1 & LAST_CPUPID_MASK);
- else
- last_cpupid = folio_last_cpupid(folio);
- target_nid = numa_migrate_prep(folio, vmf, vmf->address, nid, &flags);
+
+ target_nid = numa_migrate_check(folio, vmf, vmf->address, &flags,
+ writable, &last_cpupid);
if (target_nid == NUMA_NO_NODE)
goto out_map;
if (migrate_misplaced_folio_prepare(folio, vma, target_nid)) {
@@ -5529,7 +5529,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
vmf->address, &vmf->ptl);
if (unlikely(!vmf->pte))
goto out;
- if (unlikely(!pte_same(ptep_get(vmf->pte), vmf->orig_pte))) {
+ if (unlikely(!pte_same(old_pte, ptep_get(vmf->pte)))) {
pte_unmap_unlock(vmf->pte, vmf->ptl);
goto out;
}
--
2.43.0
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