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mm: report success more often from filemap_map_folio_range()

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Even though we had successfully mapped the relevant page, we would rarely
return success from filemap_map_folio_range().  That leads to falling back
from the VMA lock path to the mmap_lock path, which is a speed &
scalability issue.  Found by inspection.

Link: https://lkml.kernel.org/r/20230920035336.854212-1-willy@infradead.org
Fixes: 617c28ecab ("filemap: batch PTE mappings")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-09-20 04:53:35 +01:00 committed by Andrew Morton
parent 7c31515857
commit a501a07030
1 changed files with 2 additions and 2 deletions
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4
mm/filemap.c
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@ -3503,7 +3503,7 @@ static vm_fault_t filemap_map_folio_range(struct vm_fault *vmf,
if (count) {
set_pte_range(vmf, folio, page, count, addr);
folio_ref_add(folio, count);
if (in_range(vmf->address, addr, count))
if (in_range(vmf->address, addr, count * PAGE_SIZE))
ret = VM_FAULT_NOPAGE;
}
@ -3517,7 +3517,7 @@ static vm_fault_t filemap_map_folio_range(struct vm_fault *vmf,
if (count) {
set_pte_range(vmf, folio, page, count, addr);
folio_ref_add(folio, count);
if (in_range(vmf->address, addr, count))
if (in_range(vmf->address, addr, count * PAGE_SIZE))
ret = VM_FAULT_NOPAGE;
}