The patch titled
Subject: mm/damon: introduce DAMOS filter type hugepage_size
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-introduce-damos-filter-type-hugepage_size.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-introduce-damos-filter-type-hugepage_size.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Usama Arif <usamaarif642@xxxxxxxxx>
Subject: mm/damon: introduce DAMOS filter type hugepage_size
Date: Tue, 11 Feb 2025 12:43:40 +0000
Patch series "mm/damon: add support for hugepage_size DAMOS filter", v5.
hugepage_size DAMOS filter can be used to gather statistics to check if
memory regions of specific access tempratures are backed by hugepages of a
size in a specific range. This filter can help to observe and prove the
effectivenes of different schemes for shrinking/collapsing hugepages.
This patch (of 4):
This is to gather statistics to check if memory regions of specific access
tempratures are backed by pages of a size in a specific range. This
filter can help to observe and prove the effectivenes of different schemes
for shrinking/collapsing hugepages.
Link: https://lkml.kernel.org/r/20250211124437.278873-1-usamaarif642@xxxxxxxxx
Link: https://lkml.kernel.org/r/20250211124437.278873-2-usamaarif642@xxxxxxxxx
Signed-off-by: Usama Arif <usamaarif642@xxxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Usama Arif <usamaarif642@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/damon.h | 13 +++++++++++++
mm/damon/core.c | 3 +++
mm/damon/paddr.c | 6 ++++++
mm/damon/sysfs-schemes.c | 1 +
4 files changed, 23 insertions(+)
--- a/include/linux/damon.h~mm-damon-introduce-damos-filter-type-hugepage_size
+++ a/include/linux/damon.h
@@ -36,6 +36,16 @@ struct damon_addr_range {
};
/**
+ * struct damon_size_range - Represents size for filter to operate on [@min, @max].
+ * @min: Min size (inclusive).
+ * @max: Max size (inclusive).
+ */
+struct damon_size_range {
+ unsigned long min;
+ unsigned long max;
+};
+
+/**
* struct damon_region - Represents a monitoring target region.
* @ar: The address range of the region.
* @sampling_addr: Address of the sample for the next access check.
@@ -326,6 +336,7 @@ struct damos_stat {
* @DAMOS_FILTER_TYPE_ANON: Anonymous pages.
* @DAMOS_FILTER_TYPE_MEMCG: Specific memcg's pages.
* @DAMOS_FILTER_TYPE_YOUNG: Recently accessed pages.
+ * @DAMOS_FILTER_TYPE_HUGEPAGE_SIZE: Page is part of a hugepage.
* @DAMOS_FILTER_TYPE_ADDR: Address range.
* @DAMOS_FILTER_TYPE_TARGET: Data Access Monitoring target.
* @NR_DAMOS_FILTER_TYPES: Number of filter types.
@@ -345,6 +356,7 @@ enum damos_filter_type {
DAMOS_FILTER_TYPE_ANON,
DAMOS_FILTER_TYPE_MEMCG,
DAMOS_FILTER_TYPE_YOUNG,
+ DAMOS_FILTER_TYPE_HUGEPAGE_SIZE,
DAMOS_FILTER_TYPE_ADDR,
DAMOS_FILTER_TYPE_TARGET,
NR_DAMOS_FILTER_TYPES,
@@ -376,6 +388,7 @@ struct damos_filter {
unsigned short memcg_id;
struct damon_addr_range addr_range;
int target_idx;
+ struct damon_size_range sz_range;
};
struct list_head list;
};
--- a/mm/damon/core.c~mm-damon-introduce-damos-filter-type-hugepage_size
+++ a/mm/damon/core.c
@@ -776,6 +776,9 @@ static void damos_commit_filter_arg(
case DAMOS_FILTER_TYPE_TARGET:
dst->target_idx = src->target_idx;
break;
+ case DAMOS_FILTER_TYPE_HUGEPAGE_SIZE:
+ dst->sz_range = src->sz_range;
+ break;
default:
break;
}
--- a/mm/damon/paddr.c~mm-damon-introduce-damos-filter-type-hugepage_size
+++ a/mm/damon/paddr.c
@@ -203,6 +203,7 @@ static bool damos_pa_filter_match(struct
{
bool matched = false;
struct mem_cgroup *memcg;
+ size_t folio_sz;
switch (filter->type) {
case DAMOS_FILTER_TYPE_ANON:
@@ -222,6 +223,11 @@ static bool damos_pa_filter_match(struct
if (matched)
damon_folio_mkold(folio);
break;
+ case DAMOS_FILTER_TYPE_HUGEPAGE_SIZE:
+ folio_sz = folio_size(folio);
+ matched = filter->sz_range.min <= folio_sz &&
+ folio_sz <= filter->sz_range.max;
+ break;
default:
break;
}
--- a/mm/damon/sysfs-schemes.c~mm-damon-introduce-damos-filter-type-hugepage_size
+++ a/mm/damon/sysfs-schemes.c
@@ -329,6 +329,7 @@ static const char * const damon_sysfs_sc
"anon",
"memcg",
"young",
+ "hugepage_size",
"addr",
"target",
};
_
Patches currently in -mm which might be from usamaarif642@xxxxxxxxx are
mm-damon-ops-have-damon_get_folio-return-folio-even-for-tail-pages.patch
mm-damon-introduce-damos-filter-type-hugepage_size.patch
mm-damon-sysfs-schemes-add-files-for-setting-damos_filter-sz_range.patch
docs-abi-damon-document-damos-sysfs-files-to-set-the-min-max-folio_size.patch
docs-admin-guide-mm-damon-usage-document-hugepage_size-filter-type.patch
