Barry Song <21cnbao@xxxxxxxxx> writes: > 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. > Got it! Thanks! Feel free to add Acked-by: "Huang, Ying" <ying.huang@xxxxxxxxx> in the future versions. -- Best Regards, Huang, Ying
