From: Barry Song <v-songbaohua@oppo.com>
This helps to display the fragmentation situation of the swapfile, knowing
the proportion of how much we haven't split large folios. So far, we only
support non-split swapout for anon memory, with the possibility of
expanding to shmem in the future. So, we add the "anon" prefix to the
counter names.
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Cc: Yu Zhao <yuzhao@google.com>
---
include/linux/huge_mm.h | 2 ++
mm/huge_memory.c | 4 ++++
mm/page_io.c | 1 +
mm/vmscan.c | 3 +++
4 files changed, 10 insertions(+)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index d4fdb2641070..7cd07b83a3d0 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -268,6 +268,8 @@ enum mthp_stat_item {
MTHP_STAT_ANON_FAULT_ALLOC,
MTHP_STAT_ANON_FAULT_FALLBACK,
MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
+ MTHP_STAT_ANON_SWPOUT,
+ MTHP_STAT_ANON_SWPOUT_FALLBACK,
__MTHP_STAT_COUNT
};
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index dfc38cc83a04..58f2c4745d80 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -555,11 +555,15 @@ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
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(anon_swpout, MTHP_STAT_ANON_SWPOUT);
+DEFINE_MTHP_STAT_ATTR(anon_swpout_fallback, MTHP_STAT_ANON_SWPOUT_FALLBACK);
static struct attribute *stats_attrs[] = {
&anon_fault_alloc_attr.attr,
&anon_fault_fallback_attr.attr,
&anon_fault_fallback_charge_attr.attr,
+ &anon_swpout_attr.attr,
+ &anon_swpout_fallback_attr.attr,
NULL,
};
diff --git a/mm/page_io.c b/mm/page_io.c
index a9a7c236aecc..46c603dddf04 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -217,6 +217,7 @@ static inline void count_swpout_vm_event(struct folio *folio)
count_memcg_folio_events(folio, THP_SWPOUT, 1);
count_vm_event(THP_SWPOUT);
}
+ count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
#endif
count_vm_events(PSWPOUT, folio_nr_pages(folio));
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index bca2d9981c95..49bd94423961 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1231,6 +1231,8 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
goto activate_locked;
}
if (!add_to_swap(folio)) {
+ int __maybe_unused order = folio_order(folio);
+
if (!folio_test_large(folio))
goto activate_locked_split;
/* Fallback to swap normal pages */
@@ -1242,6 +1244,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
THP_SWPOUT_FALLBACK, 1);
count_vm_event(THP_SWPOUT_FALLBACK);
}
+ count_mthp_stat(order, MTHP_STAT_ANON_SWPOUT_FALLBACK);
#endif
if (!add_to_swap(folio))
goto activate_locked_split;
--
2.34.1On 12.04.24 13:48, Barry Song wrote:
> From: Barry Song <v-songbaohua@oppo.com>
>
> This helps to display the fragmentation situation of the swapfile, knowing
> the proportion of how much we haven't split large folios. So far, we only
> support non-split swapout for anon memory, with the possibility of
> expanding to shmem in the future. So, we add the "anon" prefix to the
> counter names.
>
> Signed-off-by: Barry Song <v-songbaohua@oppo.com>
> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
> Cc: Chris Li <chrisl@kernel.org>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
> Cc: Kairui Song <kasong@tencent.com>
> Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
> Cc: Peter Xu <peterx@redhat.com>
> Cc: Ryan Roberts <ryan.roberts@arm.com>
> Cc: Suren Baghdasaryan <surenb@google.com>
> Cc: Yosry Ahmed <yosryahmed@google.com>
> Cc: Yu Zhao <yuzhao@google.com>
> ---
> include/linux/huge_mm.h | 2 ++
> mm/huge_memory.c | 4 ++++
> mm/page_io.c | 1 +
> mm/vmscan.c | 3 +++
> 4 files changed, 10 insertions(+)
>
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index d4fdb2641070..7cd07b83a3d0 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -268,6 +268,8 @@ enum mthp_stat_item {
> MTHP_STAT_ANON_FAULT_ALLOC,
> MTHP_STAT_ANON_FAULT_FALLBACK,
> MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
> + MTHP_STAT_ANON_SWPOUT,
> + MTHP_STAT_ANON_SWPOUT_FALLBACK,
> __MTHP_STAT_COUNT
> };
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index dfc38cc83a04..58f2c4745d80 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -555,11 +555,15 @@ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
> 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(anon_swpout, MTHP_STAT_ANON_SWPOUT);
> +DEFINE_MTHP_STAT_ATTR(anon_swpout_fallback, MTHP_STAT_ANON_SWPOUT_FALLBACK);
>
> static struct attribute *stats_attrs[] = {
> &anon_fault_alloc_attr.attr,
> &anon_fault_fallback_attr.attr,
> &anon_fault_fallback_charge_attr.attr,
> + &anon_swpout_attr.attr,
> + &anon_swpout_fallback_attr.attr,
> NULL,
> };
>
> diff --git a/mm/page_io.c b/mm/page_io.c
> index a9a7c236aecc..46c603dddf04 100644
> --- a/mm/page_io.c
> +++ b/mm/page_io.c
> @@ -217,6 +217,7 @@ static inline void count_swpout_vm_event(struct folio *folio)
> count_memcg_folio_events(folio, THP_SWPOUT, 1);
> count_vm_event(THP_SWPOUT);
> }
> + count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
> #endif
> count_vm_events(PSWPOUT, folio_nr_pages(folio));
> }
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index bca2d9981c95..49bd94423961 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1231,6 +1231,8 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
> goto activate_locked;
> }
> if (!add_to_swap(folio)) {
> + int __maybe_unused order = folio_order(folio);
> +
> if (!folio_test_large(folio))
> goto activate_locked_split;
> /* Fallback to swap normal pages */
> @@ -1242,6 +1244,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
> THP_SWPOUT_FALLBACK, 1);
> count_vm_event(THP_SWPOUT_FALLBACK);
> }
> + count_mthp_stat(order, MTHP_STAT_ANON_SWPOUT_FALLBACK);
Why the temporary variable for order?
count_mthp_stat(folio_order(order),
MTHP_STAT_ANON_SWPOUT_FALLBACK);
... but now I do wonder if we want to pass the folio to count_mthp_stat() ?
Anyhow
Acked-by: David Hildenbrand <david@redhat.com>
--
Cheers,
David / dhildenb
On 16.04.24 10:14, David Hildenbrand wrote:
> On 12.04.24 13:48, Barry Song wrote:
>> From: Barry Song <v-songbaohua@oppo.com>
>>
>> This helps to display the fragmentation situation of the swapfile, knowing
>> the proportion of how much we haven't split large folios. So far, we only
>> support non-split swapout for anon memory, with the possibility of
>> expanding to shmem in the future. So, we add the "anon" prefix to the
>> counter names.
>>
>> Signed-off-by: Barry Song <v-songbaohua@oppo.com>
>> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
>> Cc: Chris Li <chrisl@kernel.org>
>> Cc: David Hildenbrand <david@redhat.com>
>> Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
>> Cc: Kairui Song <kasong@tencent.com>
>> Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
>> Cc: Peter Xu <peterx@redhat.com>
>> Cc: Ryan Roberts <ryan.roberts@arm.com>
>> Cc: Suren Baghdasaryan <surenb@google.com>
>> Cc: Yosry Ahmed <yosryahmed@google.com>
>> Cc: Yu Zhao <yuzhao@google.com>
>> ---
>> include/linux/huge_mm.h | 2 ++
>> mm/huge_memory.c | 4 ++++
>> mm/page_io.c | 1 +
>> mm/vmscan.c | 3 +++
>> 4 files changed, 10 insertions(+)
>>
>> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
>> index d4fdb2641070..7cd07b83a3d0 100644
>> --- a/include/linux/huge_mm.h
>> +++ b/include/linux/huge_mm.h
>> @@ -268,6 +268,8 @@ enum mthp_stat_item {
>> MTHP_STAT_ANON_FAULT_ALLOC,
>> MTHP_STAT_ANON_FAULT_FALLBACK,
>> MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
>> + MTHP_STAT_ANON_SWPOUT,
>> + MTHP_STAT_ANON_SWPOUT_FALLBACK,
>> __MTHP_STAT_COUNT
>> };
>>
>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
>> index dfc38cc83a04..58f2c4745d80 100644
>> --- a/mm/huge_memory.c
>> +++ b/mm/huge_memory.c
>> @@ -555,11 +555,15 @@ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
>> 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(anon_swpout, MTHP_STAT_ANON_SWPOUT);
>> +DEFINE_MTHP_STAT_ATTR(anon_swpout_fallback, MTHP_STAT_ANON_SWPOUT_FALLBACK);
>>
>> static struct attribute *stats_attrs[] = {
>> &anon_fault_alloc_attr.attr,
>> &anon_fault_fallback_attr.attr,
>> &anon_fault_fallback_charge_attr.attr,
>> + &anon_swpout_attr.attr,
>> + &anon_swpout_fallback_attr.attr,
>> NULL,
>> };
>>
>> diff --git a/mm/page_io.c b/mm/page_io.c
>> index a9a7c236aecc..46c603dddf04 100644
>> --- a/mm/page_io.c
>> +++ b/mm/page_io.c
>> @@ -217,6 +217,7 @@ static inline void count_swpout_vm_event(struct folio *folio)
>> count_memcg_folio_events(folio, THP_SWPOUT, 1);
>> count_vm_event(THP_SWPOUT);
>> }
>> + count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
>> #endif
>> count_vm_events(PSWPOUT, folio_nr_pages(folio));
>> }
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index bca2d9981c95..49bd94423961 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -1231,6 +1231,8 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
>> goto activate_locked;
>> }
>> if (!add_to_swap(folio)) {
>> + int __maybe_unused order = folio_order(folio);
>> +
>> if (!folio_test_large(folio))
>> goto activate_locked_split;
>> /* Fallback to swap normal pages */
>> @@ -1242,6 +1244,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
>> THP_SWPOUT_FALLBACK, 1);
>> count_vm_event(THP_SWPOUT_FALLBACK);
>> }
>> + count_mthp_stat(order, MTHP_STAT_ANON_SWPOUT_FALLBACK);
>
> Why the temporary variable for order?
>
> count_mthp_stat(folio_order(order),
> MTHP_STAT_ANON_SWPOUT_FALLBACK);
>
> ... but now I do wonder if we want to pass the folio to count_mthp_stat() ?
... and now realizing, that that doesn't make sense if we fail to
allocate the folio in the first place. So all good.
--
Cheers,
David / dhildenb
On Tue, Apr 16, 2024 at 8:14 PM David Hildenbrand <david@redhat.com> wrote:
>
> On 12.04.24 13:48, Barry Song wrote:
> > From: Barry Song <v-songbaohua@oppo.com>
> >
> > This helps to display the fragmentation situation of the swapfile, knowing
> > the proportion of how much we haven't split large folios. So far, we only
> > support non-split swapout for anon memory, with the possibility of
> > expanding to shmem in the future. So, we add the "anon" prefix to the
> > counter names.
> >
> > Signed-off-by: Barry Song <v-songbaohua@oppo.com>
> > Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
> > Cc: Chris Li <chrisl@kernel.org>
> > Cc: David Hildenbrand <david@redhat.com>
> > Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
> > Cc: Kairui Song <kasong@tencent.com>
> > Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
> > Cc: Peter Xu <peterx@redhat.com>
> > Cc: Ryan Roberts <ryan.roberts@arm.com>
> > Cc: Suren Baghdasaryan <surenb@google.com>
> > Cc: Yosry Ahmed <yosryahmed@google.com>
> > Cc: Yu Zhao <yuzhao@google.com>
> > ---
> > include/linux/huge_mm.h | 2 ++
> > mm/huge_memory.c | 4 ++++
> > mm/page_io.c | 1 +
> > mm/vmscan.c | 3 +++
> > 4 files changed, 10 insertions(+)
> >
> > diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> > index d4fdb2641070..7cd07b83a3d0 100644
> > --- a/include/linux/huge_mm.h
> > +++ b/include/linux/huge_mm.h
> > @@ -268,6 +268,8 @@ enum mthp_stat_item {
> > MTHP_STAT_ANON_FAULT_ALLOC,
> > MTHP_STAT_ANON_FAULT_FALLBACK,
> > MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
> > + MTHP_STAT_ANON_SWPOUT,
> > + MTHP_STAT_ANON_SWPOUT_FALLBACK,
> > __MTHP_STAT_COUNT
> > };
> >
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > index dfc38cc83a04..58f2c4745d80 100644
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -555,11 +555,15 @@ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
> > 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(anon_swpout, MTHP_STAT_ANON_SWPOUT);
> > +DEFINE_MTHP_STAT_ATTR(anon_swpout_fallback, MTHP_STAT_ANON_SWPOUT_FALLBACK);
> >
> > static struct attribute *stats_attrs[] = {
> > &anon_fault_alloc_attr.attr,
> > &anon_fault_fallback_attr.attr,
> > &anon_fault_fallback_charge_attr.attr,
> > + &anon_swpout_attr.attr,
> > + &anon_swpout_fallback_attr.attr,
> > NULL,
> > };
> >
> > diff --git a/mm/page_io.c b/mm/page_io.c
> > index a9a7c236aecc..46c603dddf04 100644
> > --- a/mm/page_io.c
> > +++ b/mm/page_io.c
> > @@ -217,6 +217,7 @@ static inline void count_swpout_vm_event(struct folio *folio)
> > count_memcg_folio_events(folio, THP_SWPOUT, 1);
> > count_vm_event(THP_SWPOUT);
> > }
> > + count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
> > #endif
> > count_vm_events(PSWPOUT, folio_nr_pages(folio));
> > }
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index bca2d9981c95..49bd94423961 100644
> > --- a/mm/vmscan.c
> > +++ b/mm/vmscan.c
> > @@ -1231,6 +1231,8 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
> > goto activate_locked;
> > }
> > if (!add_to_swap(folio)) {
> > + int __maybe_unused order = folio_order(folio);
> > +
> > if (!folio_test_large(folio))
> > goto activate_locked_split;
> > /* Fallback to swap normal pages */
> > @@ -1242,6 +1244,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
> > THP_SWPOUT_FALLBACK, 1);
> > count_vm_event(THP_SWPOUT_FALLBACK);
> > }
> > + count_mthp_stat(order, MTHP_STAT_ANON_SWPOUT_FALLBACK);
>
> Why the temporary variable for order?
>
> count_mthp_stat(folio_order(order),
> MTHP_STAT_ANON_SWPOUT_FALLBACK);
>
> ... but now I do wonder if we want to pass the folio to count_mthp_stat() ?
because we have called split_folio_to_list() before counting. that is also
why Ryan is using if (nr_pages >= HPAGE_PMD_NR) but not pmd_mappable.
>
> Anyhow
>
> Acked-by: David Hildenbrand <david@redhat.com>
thanks!
>
> --
> Cheers,
>
> David / dhildenb
>
Barry
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