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mm: huge_memory: use a folio in do_huge_pmd_numa_page()

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Use a folio in do_huge_pmd_numa_page(), reduce three page_folio() calls to
one, no functional change intended.

Link: https://lkml.kernel.org/r/20230921074417.24004-3-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2023-09-21 15:44:13 +08:00 committed by Andrew Morton
parent 6561045345
commit 667ffc31aa
1 changed files with 13 additions and 16 deletions
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29
mm/huge_memory.c
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@ -1517,9 +1517,9 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
struct vm_area_struct *vma = vmf->vma;
pmd_t oldpmd = vmf->orig_pmd;
pmd_t pmd;
struct page *page;
struct folio *folio;
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
int page_nid = NUMA_NO_NODE;
int nid = NUMA_NO_NODE;
int target_nid, last_cpupid = (-1 & LAST_CPUPID_MASK);
bool migrated = false, writable = false;
int flags = 0;
@ -1541,36 +1541,34 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
can_change_pmd_writable(vma, vmf->address, pmd))
writable = true;
page = vm_normal_page_pmd(vma, haddr, pmd);
if (!page)
folio = vm_normal_folio_pmd(vma, haddr, pmd);
if (!folio)
goto out_map;
/* See similar comment in do_numa_page for explanation */
if (!writable)
flags |= TNF_NO_GROUP;
page_nid = page_to_nid(page);
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 (node_is_toptier(page_nid))
last_cpupid = page_cpupid_last(page);
target_nid = numa_migrate_prep(page, vma, haddr, page_nid,
&flags);
if (node_is_toptier(nid))
last_cpupid = page_cpupid_last(&folio->page);
target_nid = numa_migrate_prep(&folio->page, vma, haddr, nid, &flags);
if (target_nid == NUMA_NO_NODE) {
put_page(page);
folio_put(folio);
goto out_map;
}
spin_unlock(vmf->ptl);
writable = false;
migrated = migrate_misplaced_folio(page_folio(page), vma, target_nid);
migrated = migrate_misplaced_folio(folio, vma, target_nid);
if (migrated) {
flags |= TNF_MIGRATED;
page_nid = target_nid;
nid = target_nid;
} else {
flags |= TNF_MIGRATE_FAIL;
vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
@ -1582,9 +1580,8 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
}
out:
if (page_nid != NUMA_NO_NODE)
task_numa_fault(last_cpupid, page_nid, HPAGE_PMD_NR,
flags);
if (nid != NUMA_NO_NODE)
task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags);
return 0;