On Thu, Oct 31, 2024 at 9:09 PM Huang, Ying <ying.huang@xxxxxxxxx> wrote: > > Barry Song <21cnbao@xxxxxxxxx> writes: > > > From: Barry Song <v-songbaohua@xxxxxxxx> > > > > This helps profile the sizes of folios being swapped in. Currently, > > only mTHP swap-out is being counted. > > The new interface can be found at: > > /sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats/swpin > > For example, > > $ cat /sys/kernel/mm/transparent_hugepage/hugepages-64kB/stats/swpin > > 12809 > > $ cat /sys/kernel/mm/transparent_hugepage/hugepages-32kB/stats/swpin > > 4763 > > > > Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx> > > Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> > > Acked-by: David Hildenbrand <david@xxxxxxxxxx> > > Cc: Chris Li <chrisl@xxxxxxxxxx> > > Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx> > > Cc: "Huang, Ying" <ying.huang@xxxxxxxxx> > > Cc: Kairui Song <kasong@xxxxxxxxxxx> > > Cc: Ryan Roberts <ryan.roberts@xxxxxxx> > > Cc: Kanchana P Sridhar <kanchana.p.sridhar@xxxxxxxxx> > > Cc: Usama Arif <usamaarif642@xxxxxxxxx> > > --- > > -v3: minor refine changelog per Huang, Ying. thanks! > > > > Documentation/admin-guide/mm/transhuge.rst | 4 ++++ > > include/linux/huge_mm.h | 1 + > > mm/huge_memory.c | 3 +++ > > mm/page_io.c | 3 +++ > > 4 files changed, 11 insertions(+) > > > > diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst > > index 2a171ed5206e..5caa3fb2feb1 100644 > > --- a/Documentation/admin-guide/mm/transhuge.rst > > +++ b/Documentation/admin-guide/mm/transhuge.rst > > @@ -534,6 +534,10 @@ zswpout > > is incremented every time a huge page is swapped out to zswap in one > > piece without splitting. > > > > +swpin > > + is incremented every time a huge page is swapped in from a non-zswap > > + swap device in one piece. > > + > > swpout > > is incremented every time a huge page is swapped out to a non-zswap > > swap device in one piece without splitting. > > In Documentation/ABI/testing/sysfs-kernel-mm-transparent-hugepage, I > found > > " > What: /sys/kernel/mm/transparent_hugepage/ > Date: April 2024 > Contact: Linux memory management mailing list <linux-mm@xxxxxxxxx> > Description: > /sys/kernel/mm/transparent_hugepage/ contains a number of files and > subdirectories, > > - defrag > - enabled > - hpage_pmd_size > - khugepaged > - shmem_enabled > - use_zero_page > - subdirectories of the form hugepages-<size>kB, where <size> > is the page size of the hugepages supported by the kernel/CPU > combination. > > See Documentation/admin-guide/mm/transhuge.rst for details. > " > > So, Documentation/admin-guide/mm/transhuge.rst will be used as ABI > document? Yes. this follows: sysfs-kernel-mm-hugepages: See Documentation/admin-guide/mm/hugetlbpage.rst for details. sysfs-kernel-mm-ksm: See Documentation/mm/ksm.rst for more information. sysfs-kernel-mm-transparent-hugepage: See Documentation/admin-guide/mm/transhuge.rst for details. > > [snip] > > -- > Best Regards, > Huang, Ying Thanks barry
