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mm: mincore: improve mincore_hugetlb()

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walk_hugetlb_range() always passes a non-NULL pte, so remove the dead NULL
check.  Replace the per-page iteration loop with memset() for better
performance.

[wangkefeng.wang@huawei.com: fixup improve mincore_hugetlb()]
  Link: https://lore.kernel.org/20260720124252.1483984-1-wangkefeng.wang@huawei.com
Link: https://lore.kernel.org/20260717091347.1144789-6-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2026-07-17 17:13:46 +08:00 committed by Andrew Morton
parent 9218800076
commit 751a1f061a
1 changed files with 7 additions and 21 deletions
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28
mm/mincore.c
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@ -28,30 +28,16 @@ static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
#ifdef CONFIG_HUGETLB_PAGE
unsigned char present;
unsigned char *vec = walk->private;
const unsigned long nr = (end - addr) >> PAGE_SHIFT;
unsigned char resident;
spinlock_t *ptl;
pte_t ptep;
ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
/*
* Hugepages under user process are always in RAM and never
* swapped out, but theoretically it needs to be checked.
*/
if (!pte) {
present = 0;
} else {
const pte_t ptep = huge_ptep_get(walk->mm, addr, pte);
if (huge_pte_none(ptep) || pte_is_marker(ptep))
present = 0;
else
present = 1;
}
for (; addr != end; vec++, addr += PAGE_SIZE)
*vec = present;
walk->private = vec;
ptep = huge_ptep_get(walk->mm, addr, pte);
resident = !huge_pte_none(ptep) && !pte_is_marker(ptep);
memset(walk->private, resident, nr);
walk->private += nr;
spin_unlock(ptl);
#else
BUG();