Re: [PATCH v1 05/18] mm: improve folio_likely_mapped_shared() using the mapcount of large folios
"Yin, Fengwei" <[email protected]>
| Newsgroups | gmane.linux.kernel.cgroups,gmane.linux.kernel,gmane.linux.kernel.mm,gmane.linux.documentation,gmane.linux.ports.sh.devel,gmane.linux.file-systems |
|---|---|
| Message-ID | <[email protected]> |
On 4/10/2024 3:22 AM, David Hildenbrand wrote: > We can now read the mapcount of large folios very efficiently. Use it to > improve our handling of partially-mappable folios, falling back > to making a guess only in case the folio is not "obviously mapped shared". > > We can now better detect partially-mappable folios where the first page is > not mapped as "mapped shared", reducing "false negatives"; but false > negatives are still possible. > > While at it, fixup a wrong comment (false positive vs. false negative) > for KSM folios. > > Signed-off-by: David Hildenbrand <[email protected]> Reviewed-by: Yin Fengwei <[email protected]>