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(+)
From: Barry Song <v-songbaohua@oppo.com>
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@oppo.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Yosry Ahmed <yosryahmed@google.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Kanchana P Sridhar <kanchana.p.sridhar@intel.com>
Cc: Usama Arif <usamaarif642@gmail.com>
---
-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.
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index c59e5aa9b081..b94c2e8ee918 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -120,6 +120,7 @@ enum mthp_stat_item {
MTHP_STAT_ANON_FAULT_FALLBACK,
MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
MTHP_STAT_ZSWPOUT,
+ MTHP_STAT_SWPIN,
MTHP_STAT_SWPOUT,
MTHP_STAT_SWPOUT_FALLBACK,
MTHP_STAT_SHMEM_ALLOC,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b26c6503e993..f92068864469 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -616,6 +616,7 @@ DEFINE_MTHP_STAT_ATTR(anon_fault_alloc, MTHP_STAT_ANON_FAULT_ALLOC);
DEFINE_MTHP_STAT_ATTR(anon_fault_fallback, MTHP_STAT_ANON_FAULT_FALLBACK);
DEFINE_MTHP_STAT_ATTR(anon_fault_fallback_charge, MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE);
DEFINE_MTHP_STAT_ATTR(zswpout, MTHP_STAT_ZSWPOUT);
+DEFINE_MTHP_STAT_ATTR(swpin, MTHP_STAT_SWPIN);
DEFINE_MTHP_STAT_ATTR(swpout, MTHP_STAT_SWPOUT);
DEFINE_MTHP_STAT_ATTR(swpout_fallback, MTHP_STAT_SWPOUT_FALLBACK);
#ifdef CONFIG_SHMEM
@@ -635,6 +636,7 @@ static struct attribute *anon_stats_attrs[] = {
&anon_fault_fallback_charge_attr.attr,
#ifndef CONFIG_SHMEM
&zswpout_attr.attr,
+ &swpin_attr.attr,
&swpout_attr.attr,
&swpout_fallback_attr.attr,
#endif
@@ -666,6 +668,7 @@ static struct attribute_group file_stats_attr_grp = {
static struct attribute *any_stats_attrs[] = {
#ifdef CONFIG_SHMEM
&zswpout_attr.attr,
+ &swpin_attr.attr,
&swpout_attr.attr,
&swpout_fallback_attr.attr,
#endif
diff --git a/mm/page_io.c b/mm/page_io.c
index c69fab5060a1..5d9b6e6cf96c 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -487,6 +487,7 @@ static void sio_read_complete(struct kiocb *iocb, long ret)
for (p = 0; p < sio->pages; p++) {
struct folio *folio = page_folio(sio->bvec[p].bv_page);
+ count_mthp_stat(folio_order(folio), MTHP_STAT_SWPIN);
count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
folio_mark_uptodate(folio);
folio_unlock(folio);
@@ -573,6 +574,7 @@ static void swap_read_folio_bdev_sync(struct folio *folio,
* attempt to access it in the page fault retry time check.
*/
get_task_struct(current);
+ count_mthp_stat(folio_order(folio), MTHP_STAT_SWPIN);
count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
count_vm_events(PSWPIN, folio_nr_pages(folio));
submit_bio_wait(&bio);
@@ -589,6 +591,7 @@ static void swap_read_folio_bdev_async(struct folio *folio,
bio->bi_iter.bi_sector = swap_folio_sector(folio);
bio->bi_end_io = end_swap_bio_read;
bio_add_folio_nofail(bio, folio, folio_size(folio), 0);
+ count_mthp_stat(folio_order(folio), MTHP_STAT_SWPIN);
count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
count_vm_events(PSWPIN, folio_nr_pages(folio));
submit_bio(bio);
--
2.39.3 (Apple Git-146)Barry Song <21cnbao@gmail.com> writes: > From: Barry Song <v-songbaohua@oppo.com> > > 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@oppo.com> > Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> > Acked-by: David Hildenbrand <david@redhat.com> > Cc: Chris Li <chrisl@kernel.org> > Cc: Yosry Ahmed <yosryahmed@google.com> > Cc: "Huang, Ying" <ying.huang@intel.com> > Cc: Kairui Song <kasong@tencent.com> > Cc: Ryan Roberts <ryan.roberts@arm.com> > Cc: Kanchana P Sridhar <kanchana.p.sridhar@intel.com> > Cc: Usama Arif <usamaarif642@gmail.com> > --- > -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@kvack.org> 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? [snip] -- Best Regards, Huang, Ying
On Thu, Oct 31, 2024 at 9:09 PM Huang, Ying <ying.huang@intel.com> wrote: > > Barry Song <21cnbao@gmail.com> writes: > > > From: Barry Song <v-songbaohua@oppo.com> > > > > 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@oppo.com> > > Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> > > Acked-by: David Hildenbrand <david@redhat.com> > > Cc: Chris Li <chrisl@kernel.org> > > Cc: Yosry Ahmed <yosryahmed@google.com> > > Cc: "Huang, Ying" <ying.huang@intel.com> > > Cc: Kairui Song <kasong@tencent.com> > > Cc: Ryan Roberts <ryan.roberts@arm.com> > > Cc: Kanchana P Sridhar <kanchana.p.sridhar@intel.com> > > Cc: Usama Arif <usamaarif642@gmail.com> > > --- > > -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@kvack.org> > 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
Barry Song <21cnbao@gmail.com> writes: > On Thu, Oct 31, 2024 at 9:09 PM Huang, Ying <ying.huang@intel.com> wrote: >> >> Barry Song <21cnbao@gmail.com> writes: >> >> > From: Barry Song <v-songbaohua@oppo.com> >> > >> > 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@oppo.com> >> > Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> >> > Acked-by: David Hildenbrand <david@redhat.com> >> > Cc: Chris Li <chrisl@kernel.org> >> > Cc: Yosry Ahmed <yosryahmed@google.com> >> > Cc: "Huang, Ying" <ying.huang@intel.com> >> > Cc: Kairui Song <kasong@tencent.com> >> > Cc: Ryan Roberts <ryan.roberts@arm.com> >> > Cc: Kanchana P Sridhar <kanchana.p.sridhar@intel.com> >> > Cc: Usama Arif <usamaarif642@gmail.com> >> > --- >> > -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@kvack.org> >> 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@intel.com> in the future versions. -- Best Regards, Huang, Ying
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