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0ySo4dZb1O+dmCHfEIMctAk+nC98d/gSgUnHhxE7bw9XdFrs828ZzPVz/R7rQXAgh9HQgKvyTaKVaGILbTMq9UWMhpzfqvlYZpNztGCc1vwKpeU4ITGetfaHkVzERMjBM6mzZFHYEcMKoMy/OxolE/Ipek1x7nKpIaXA6EB7MEKwZJm5vBZHFwyi31ZgqN6f7O1OLHp6n98Io9cIydHJbEuxUUrrSkF5Ia5WEIqDBVWlgF2+5E/3uOZqxrNVcUQIq5iRQbC+y+hmb0dhVOpSAc/2WMO14BLIQzkUjAXPiDPAnou2F/lvT2i6j27Ia4eeIt8DKyONK4mZlNUWSHYXkl8Tg0LcXzlTHt+a0F4UCpRiYB9hwuVCi5mIdjIe3KTlHHqGqoPwvVUx+cHILRYD2TrH6uA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 9/20/23 11:53, Matthew Wilcox (Oracle) wrote: > 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. > > Signed-off-by: Matthew Wilcox (Oracle) > Fixes: 617c28ecab22 ("filemap: batch PTE mappings") > --- Reviewed-by: Yin Fengwei Thanks a lot for taking care of this. Regards Yin, Fengwei > mm/filemap.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/mm/filemap.c b/mm/filemap.c > index 582f5317ff71..580d0b2b1a7c 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -3506,7 +3506,7 @@ 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; > } > > @@ -3520,7 +3520,7 @@ 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; > } >