The patch titled
Subject: mm: add per-order mTHP swap-in fallback/fallback_charge counters
has been added to the -mm mm-unstable branch. Its filename is
mm-add-per-order-mthp-swap-in-fallback-fallback_charge-counters.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-add-per-order-mthp-swap-in-fallback-fallback_charge-counters.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wenchao Hao <haowenchao22@xxxxxxxxx>
Subject: mm: add per-order mTHP swap-in fallback/fallback_charge counters
Date: Mon, 2 Dec 2024 20:47:30 +0800
Currently, large folio swap-in is supported, but we lack a method to
analyze their success ratio. Similar to anon_fault_fallback, we introduce
per-order mTHP swpin_fallback and swpin_fallback_charge counters for
calculating their success ratio. The new counters are located at:
/sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats/
swpin_fallback
swpin_fallback_charge
Link: https://lkml.kernel.org/r/20241202124730.2407037-1-haowenchao22@xxxxxxxxx
Signed-off-by: Wenchao Hao <haowenchao22@xxxxxxxxx>
Reviewed-by: Barry Song <baohua@xxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Lance Yang <ioworker0@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Usama Arif <usamaarif642@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/mm/transhuge.rst | 10 ++++++++++
include/linux/huge_mm.h | 2 ++
mm/huge_memory.c | 6 ++++++
mm/memory.c | 2 ++
4 files changed, 20 insertions(+)
--- a/Documentation/admin-guide/mm/transhuge.rst~mm-add-per-order-mthp-swap-in-fallback-fallback_charge-counters
+++ a/Documentation/admin-guide/mm/transhuge.rst
@@ -591,6 +591,16 @@ swpin
is incremented every time a huge page is swapped in from a non-zswap
swap device in one piece.
+swpin_fallback
+ is incremented if swapin fails to allocate or charge a huge page
+ and instead falls back to using huge pages with lower orders or
+ small pages.
+
+swpin_fallback_charge
+ is incremented if swapin fails to charge a huge page and instead
+ falls back to using huge pages with lower orders or small pages
+ even though the allocation was successful.
+
swpout
is incremented every time a huge page is swapped out to a non-zswap
swap device in one piece without splitting.
--- a/include/linux/huge_mm.h~mm-add-per-order-mthp-swap-in-fallback-fallback_charge-counters
+++ a/include/linux/huge_mm.h
@@ -121,6 +121,8 @@ enum mthp_stat_item {
MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
MTHP_STAT_ZSWPOUT,
MTHP_STAT_SWPIN,
+ MTHP_STAT_SWPIN_FALLBACK,
+ MTHP_STAT_SWPIN_FALLBACK_CHARGE,
MTHP_STAT_SWPOUT,
MTHP_STAT_SWPOUT_FALLBACK,
MTHP_STAT_SHMEM_ALLOC,
--- a/mm/huge_memory.c~mm-add-per-order-mthp-swap-in-fallback-fallback_charge-counters
+++ a/mm/huge_memory.c
@@ -617,6 +617,8 @@ DEFINE_MTHP_STAT_ATTR(anon_fault_fallbac
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(swpin_fallback, MTHP_STAT_SWPIN_FALLBACK);
+DEFINE_MTHP_STAT_ATTR(swpin_fallback_charge, MTHP_STAT_SWPIN_FALLBACK_CHARGE);
DEFINE_MTHP_STAT_ATTR(swpout, MTHP_STAT_SWPOUT);
DEFINE_MTHP_STAT_ATTR(swpout_fallback, MTHP_STAT_SWPOUT_FALLBACK);
#ifdef CONFIG_SHMEM
@@ -637,6 +639,8 @@ static struct attribute *anon_stats_attr
#ifndef CONFIG_SHMEM
&zswpout_attr.attr,
&swpin_attr.attr,
+ &swpin_fallback_attr.attr,
+ &swpin_fallback_charge_attr.attr,
&swpout_attr.attr,
&swpout_fallback_attr.attr,
#endif
@@ -669,6 +673,8 @@ static struct attribute *any_stats_attrs
#ifdef CONFIG_SHMEM
&zswpout_attr.attr,
&swpin_attr.attr,
+ &swpin_fallback_attr.attr,
+ &swpin_fallback_charge_attr.attr,
&swpout_attr.attr,
&swpout_fallback_attr.attr,
#endif
--- a/mm/memory.c~mm-add-per-order-mthp-swap-in-fallback-fallback_charge-counters
+++ a/mm/memory.c
@@ -4258,8 +4258,10 @@ static struct folio *alloc_swap_folio(st
if (!mem_cgroup_swapin_charge_folio(folio, vma->vm_mm,
gfp, entry))
return folio;
+ count_mthp_stat(order, MTHP_STAT_SWPIN_FALLBACK_CHARGE);
folio_put(folio);
}
+ count_mthp_stat(order, MTHP_STAT_SWPIN_FALLBACK);
order = next_order(&orders, order);
}
_
Patches currently in -mm which might be from haowenchao22@xxxxxxxxx are
mm-add-per-order-mthp-swap-in-fallback-fallback_charge-counters.patch
