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 zPcW/beo 4i+v/RcL6/fKFZ1ElusFq6bvNA6d22MU+9tjJM+0swdHxiQS/sGNYvqXZHjtm8sCplGwbDIwJZ6JTC8EcX0fMcGryJpzdSTQmEG3vyAeRGbM6pntIefxZNmiiytfnVjZVErYOKybad+Rrr3gvKok1s0vSDsrpt0iU4g6OWrjyhwECQ5EQJxZW70Wqq/eQmzVCDAyPWu8GSdiHAb1Df888X4e4rfHa5UsJPCzEqQsA9dazSrLOQBeazJSBVDqQZ8NGZxKhAN9pTYAr3DZ4niaWmMKX/ONtgM5ye7LJ2JvaZoMtvGvq3H2/X6ZMWHJGMkG10/j4KUR4cobfJMilOM7l4H5h9YqtRgGWBB5ue20VsCTiPcZ/adfq9bxqdeaah+KikyfLd45BVo3Q4I/6HrOWB5viRg== 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: List-Subscribe: List-Unsubscribe: On Mon Feb 24, 2025 at 11:56 AM EST, David Hildenbrand wrote: > Let's implement an alternative when per-page mapcounts in large folios ar= e > no longer maintained -- soon with CONFIG_NO_PAGE_MAPCOUNT. > > For calculating "mapmax", we now use the average per-page mapcount in > a large folio instead of the per-page mapcount. > > For hugetlb folios and folios that are not partially mapped into MMs, > there is no change. > > Likely, this change will not matter much in practice, and an alternative > might be to simple remove this stat with CONFIG_NO_PAGE_MAPCOUNT. > However, there might be value to it, so let's keep it like that and > document the behavior. > > Signed-off-by: David Hildenbrand > --- > Documentation/filesystems/proc.rst | 5 +++++ > fs/proc/task_mmu.c | 7 ++++++- > 2 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesyste= ms/proc.rst > index 09f0aed5a08ba..1aa190017f796 100644 > --- a/Documentation/filesystems/proc.rst > +++ b/Documentation/filesystems/proc.rst > @@ -686,6 +686,11 @@ Where: > node locality page counters (N0 =3D=3D node0, N1 =3D=3D node1, ...) and = the kernel page > size, in KB, that is backing the mapping up. > =20 > +Note that some kernel configurations do not track the precise number of = times > +a page part of a larger allocation (e.g., THP) is mapped. In these > +configurations, "mapmax" might corresponds to the average number of mapp= ings > +per page in such a larger allocation instead. > + > 1.2 Kernel data > --------------- > =20 > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c > index 80839bbf9657f..d7ee842367f0f 100644 > --- a/fs/proc/task_mmu.c > +++ b/fs/proc/task_mmu.c > @@ -2862,7 +2862,12 @@ static void gather_stats(struct page *page, struct= numa_maps *md, int pte_dirty, > unsigned long nr_pages) > { > struct folio *folio =3D page_folio(page); > - int count =3D folio_precise_page_mapcount(folio, page); > + int count; > + > + if (IS_ENABLED(CONFIG_PAGE_MAPCOUNT)) > + count =3D folio_precise_page_mapcount(folio, page); > + else > + count =3D min_t(int, folio_average_page_mapcount(folio), 1); s/min/max ? Otherwise, count is at most 1. Anyway, if you change folio_average_page_mapcount() as I indicated in patch 16, this will become count =3D folio_average_page_mapcount(folio). > =20 > md->pages +=3D nr_pages; > if (pte_dirty || folio_test_dirty(folio)) --=20 Best Regards, Yan, Zi