* + mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch added to mm-unstable branch
@ 2025-02-06 8:05 Andrew Morton
0 siblings, 0 replies; 5+ messages in thread
From: Andrew Morton @ 2025-02-06 8:05 UTC (permalink / raw)
To: mm-commits, yuzhao, yang, willy, wangkefeng.wang, ryan.roberts,
linmiaohe, kirill.shutemov, jhubbard, hughd, david, baolin.wang,
ziy, akpm
The patch titled
Subject: mm/huge_memory: add folio_split() to debugfs testing interface.
has been added to the -mm mm-unstable branch. Its filename is
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-add-folio_split-to-debugfs-testing-interface.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: Zi Yan <ziy@nvidia.com>
Subject: mm/huge_memory: add folio_split() to debugfs testing interface.
Date: Tue, 4 Feb 2025 22:14:15 -0500
This allows to test folio_split() by specifying an additional in folio
page offset parameter to split_huge_page debugfs interface.
Link: https://lkml.kernel.org/r/20250205031417.1771278-6-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickens <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: linmiaohe <linmiaohe@huawei.com>
Cc: Mattew Wilcox <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/huge_memory.c | 47 ++++++++++++++++++++++++++++++++-------------
1 file changed, 34 insertions(+), 13 deletions(-)
--- a/mm/huge_memory.c~mm-huge_memory-add-folio_split-to-debugfs-testing-interface
+++ a/mm/huge_memory.c
@@ -4293,7 +4293,8 @@ static inline bool vma_not_suitable_for_
}
static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
- unsigned long vaddr_end, unsigned int new_order)
+ unsigned long vaddr_end, unsigned int new_order,
+ long in_folio_offset)
{
int ret = 0;
struct task_struct *task;
@@ -4377,8 +4378,16 @@ static int split_huge_pages_pid(int pid,
if (!folio_test_anon(folio) && folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 ||
+ in_folio_offset >= folio_nr_pages(folio)) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
@@ -4401,7 +4410,8 @@ out:
}
static int split_huge_pages_in_file(const char *file_path, pgoff_t off_start,
- pgoff_t off_end, unsigned int new_order)
+ pgoff_t off_end, unsigned int new_order,
+ long in_folio_offset)
{
struct filename *file;
struct file *candidate;
@@ -4450,8 +4460,15 @@ static int split_huge_pages_in_file(cons
if (folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 || in_folio_offset >= nr_pages) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
folio_unlock(folio);
@@ -4484,6 +4501,7 @@ static ssize_t split_huge_pages_write(st
int pid;
unsigned long vaddr_start, vaddr_end;
unsigned int new_order = 0;
+ long in_folio_offset = -1;
ret = mutex_lock_interruptible(&split_debug_mutex);
if (ret)
@@ -4512,30 +4530,33 @@ static ssize_t split_huge_pages_write(st
goto out;
}
- ret = sscanf(tok_buf, "0x%lx,0x%lx,%d", &off_start,
- &off_end, &new_order);
- if (ret != 2 && ret != 3) {
+ ret = sscanf(tok_buf, "0x%lx,0x%lx,%d,%ld", &off_start, &off_end,
+ &new_order, &in_folio_offset);
+ if (ret != 2 && ret != 3 && ret != 4) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_in_file(file_path, off_start, off_end, new_order);
+ ret = split_huge_pages_in_file(file_path, off_start, off_end,
+ new_order, in_folio_offset);
if (!ret)
ret = input_len;
goto out;
}
- ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d", &pid, &vaddr_start, &vaddr_end, &new_order);
+ ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d,%ld", &pid, &vaddr_start,
+ &vaddr_end, &new_order, &in_folio_offset);
if (ret == 1 && pid == 1) {
split_huge_pages_all();
ret = strlen(input_buf);
goto out;
- } else if (ret != 3 && ret != 4) {
+ } else if (ret != 3 && ret != 4 && ret != 5) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order);
+ ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order,
+ in_folio_offset);
if (!ret)
ret = strlen(input_buf);
out:
_
Patches currently in -mm which might be from ziy@nvidia.com are
selftests-mm-make-file-backed-thp-split-work-by-writing-pmd-size-data.patch
mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch
selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split.patch
mm-huge_memory-move-folio-split-common-code-to-__folio_split.patch
mm-huge_memory-add-buddy-allocator-like-folio_split.patch
mm-huge_memory-remove-the-old-unused-__split_huge_page.patch
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
mm-truncate-use-buddy-allocator-like-folio-split-for-truncate-operation.patch
selftests-mm-add-tests-for-folio_split-buddy-allocator-like-split.patch
^ permalink raw reply [flat|nested] 5+ messages in thread
* + mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch added to mm-unstable branch
@ 2025-02-11 23:03 Andrew Morton
0 siblings, 0 replies; 5+ messages in thread
From: Andrew Morton @ 2025-02-11 23:03 UTC (permalink / raw)
To: mm-commits, yuzhao, yang, willy, wangkefeng.wang, ryan.roberts,
linmiaohe, kirill.shutemov, jhubbard, hughd, david, baolin.wang,
ziy, akpm
The patch titled
Subject: mm/huge_memory: add folio_split() to debugfs testing interface.
has been added to the -mm mm-unstable branch. Its filename is
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-add-folio_split-to-debugfs-testing-interface.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: Zi Yan <ziy@nvidia.com>
Subject: mm/huge_memory: add folio_split() to debugfs testing interface.
Date: Tue, 11 Feb 2025 10:50:31 -0500
This allows to test folio_split() by specifying an additional in folio
page offset parameter to split_huge_page debugfs interface.
Link: https://lkml.kernel.org/r/20250211155034.268962-7-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/huge_memory.c | 47 ++++++++++++++++++++++++++++++++-------------
1 file changed, 34 insertions(+), 13 deletions(-)
--- a/mm/huge_memory.c~mm-huge_memory-add-folio_split-to-debugfs-testing-interface
+++ a/mm/huge_memory.c
@@ -4285,7 +4285,8 @@ static inline bool vma_not_suitable_for_
}
static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
- unsigned long vaddr_end, unsigned int new_order)
+ unsigned long vaddr_end, unsigned int new_order,
+ long in_folio_offset)
{
int ret = 0;
struct task_struct *task;
@@ -4369,8 +4370,16 @@ static int split_huge_pages_pid(int pid,
if (!folio_test_anon(folio) && folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 ||
+ in_folio_offset >= folio_nr_pages(folio)) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
@@ -4393,7 +4402,8 @@ out:
}
static int split_huge_pages_in_file(const char *file_path, pgoff_t off_start,
- pgoff_t off_end, unsigned int new_order)
+ pgoff_t off_end, unsigned int new_order,
+ long in_folio_offset)
{
struct filename *file;
struct file *candidate;
@@ -4442,8 +4452,15 @@ static int split_huge_pages_in_file(cons
if (folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 || in_folio_offset >= nr_pages) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
folio_unlock(folio);
@@ -4476,6 +4493,7 @@ static ssize_t split_huge_pages_write(st
int pid;
unsigned long vaddr_start, vaddr_end;
unsigned int new_order = 0;
+ long in_folio_offset = -1;
ret = mutex_lock_interruptible(&split_debug_mutex);
if (ret)
@@ -4504,30 +4522,33 @@ static ssize_t split_huge_pages_write(st
goto out;
}
- ret = sscanf(tok_buf, "0x%lx,0x%lx,%d", &off_start,
- &off_end, &new_order);
- if (ret != 2 && ret != 3) {
+ ret = sscanf(tok_buf, "0x%lx,0x%lx,%d,%ld", &off_start, &off_end,
+ &new_order, &in_folio_offset);
+ if (ret != 2 && ret != 3 && ret != 4) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_in_file(file_path, off_start, off_end, new_order);
+ ret = split_huge_pages_in_file(file_path, off_start, off_end,
+ new_order, in_folio_offset);
if (!ret)
ret = input_len;
goto out;
}
- ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d", &pid, &vaddr_start, &vaddr_end, &new_order);
+ ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d,%ld", &pid, &vaddr_start,
+ &vaddr_end, &new_order, &in_folio_offset);
if (ret == 1 && pid == 1) {
split_huge_pages_all();
ret = strlen(input_buf);
goto out;
- } else if (ret != 3 && ret != 4) {
+ } else if (ret != 3 && ret != 4 && ret != 5) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order);
+ ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order,
+ in_folio_offset);
if (!ret)
ret = strlen(input_buf);
out:
_
Patches currently in -mm which might be from ziy@nvidia.com are
selftests-mm-make-file-backed-thp-split-work-by-writing-pmd-size-data.patch
mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch
selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
xarray-add-xas_try_split-to-split-a-multi-index-entry.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split.patch
mm-huge_memory-move-folio-split-common-code-to-__folio_split.patch
mm-huge_memory-add-buddy-allocator-like-non-uniform-folio_split.patch
mm-huge_memory-remove-the-old-unused-__split_huge_page.patch
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
mm-truncate-use-buddy-allocator-like-folio-split-for-truncate-operation.patch
selftests-mm-add-tests-for-folio_split-buddy-allocator-like-split.patch
^ permalink raw reply [flat|nested] 5+ messages in thread
* + mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch added to mm-unstable branch
@ 2025-02-19 1:10 Andrew Morton
0 siblings, 0 replies; 5+ messages in thread
From: Andrew Morton @ 2025-02-19 1:10 UTC (permalink / raw)
To: mm-commits, yuzhao, yang, willy, wangkefeng.wang, ryan.roberts,
linmiaohe, kirill.shutemov, kasong, jhubbard, hughd, david,
baolin.wang, ziy, akpm
The patch titled
Subject: mm/huge_memory: add folio_split() to debugfs testing interface
has been added to the -mm mm-unstable branch. Its filename is
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-add-folio_split-to-debugfs-testing-interface.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: Zi Yan <ziy@nvidia.com>
Subject: mm/huge_memory: add folio_split() to debugfs testing interface
Date: Tue, 18 Feb 2025 18:50:10 -0500
This allows to test folio_split() by specifying an additional in folio
page offset parameter to split_huge_page debugfs interface.
Link: https://lkml.kernel.org/r/20250218235012.1542225-7-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/huge_memory.c | 47 ++++++++++++++++++++++++++++++++-------------
1 file changed, 34 insertions(+), 13 deletions(-)
--- a/mm/huge_memory.c~mm-huge_memory-add-folio_split-to-debugfs-testing-interface
+++ a/mm/huge_memory.c
@@ -4313,7 +4313,8 @@ static inline bool vma_not_suitable_for_
}
static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
- unsigned long vaddr_end, unsigned int new_order)
+ unsigned long vaddr_end, unsigned int new_order,
+ long in_folio_offset)
{
int ret = 0;
struct task_struct *task;
@@ -4397,8 +4398,16 @@ static int split_huge_pages_pid(int pid,
if (!folio_test_anon(folio) && folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 ||
+ in_folio_offset >= folio_nr_pages(folio)) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
@@ -4421,7 +4430,8 @@ out:
}
static int split_huge_pages_in_file(const char *file_path, pgoff_t off_start,
- pgoff_t off_end, unsigned int new_order)
+ pgoff_t off_end, unsigned int new_order,
+ long in_folio_offset)
{
struct filename *file;
struct file *candidate;
@@ -4470,8 +4480,15 @@ static int split_huge_pages_in_file(cons
if (folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 || in_folio_offset >= nr_pages) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
folio_unlock(folio);
@@ -4504,6 +4521,7 @@ static ssize_t split_huge_pages_write(st
int pid;
unsigned long vaddr_start, vaddr_end;
unsigned int new_order = 0;
+ long in_folio_offset = -1;
ret = mutex_lock_interruptible(&split_debug_mutex);
if (ret)
@@ -4532,30 +4550,33 @@ static ssize_t split_huge_pages_write(st
goto out;
}
- ret = sscanf(tok_buf, "0x%lx,0x%lx,%d", &off_start,
- &off_end, &new_order);
- if (ret != 2 && ret != 3) {
+ ret = sscanf(tok_buf, "0x%lx,0x%lx,%d,%ld", &off_start, &off_end,
+ &new_order, &in_folio_offset);
+ if (ret != 2 && ret != 3 && ret != 4) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_in_file(file_path, off_start, off_end, new_order);
+ ret = split_huge_pages_in_file(file_path, off_start, off_end,
+ new_order, in_folio_offset);
if (!ret)
ret = input_len;
goto out;
}
- ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d", &pid, &vaddr_start, &vaddr_end, &new_order);
+ ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d,%ld", &pid, &vaddr_start,
+ &vaddr_end, &new_order, &in_folio_offset);
if (ret == 1 && pid == 1) {
split_huge_pages_all();
ret = strlen(input_buf);
goto out;
- } else if (ret != 3 && ret != 4) {
+ } else if (ret != 3 && ret != 4 && ret != 5) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order);
+ ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order,
+ in_folio_offset);
if (!ret)
ret = strlen(input_buf);
out:
_
Patches currently in -mm which might be from ziy@nvidia.com are
selftests-mm-make-file-backed-thp-split-work-by-writing-pmd-size-data.patch
mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch
selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
xarray-add-xas_try_split-to-split-a-multi-index-entry.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split.patch
mm-huge_memory-move-folio-split-common-code-to-__folio_split.patch
mm-huge_memory-add-buddy-allocator-like-non-uniform-folio_split.patch
mm-huge_memory-remove-the-old-unused-__split_huge_page.patch
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
mm-truncate-use-buddy-allocator-like-folio-split-for-truncate-operation.patch
selftests-mm-add-tests-for-folio_split-buddy-allocator-like-split.patch
mm-filemap-use-xas_try_split-in-__filemap_add_folio.patch
mm-shmem-use-xas_try_split-in-shmem_split_large_entry.patch
^ permalink raw reply [flat|nested] 5+ messages in thread
* + mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch added to mm-unstable branch
@ 2025-02-26 21:14 Andrew Morton
0 siblings, 0 replies; 5+ messages in thread
From: Andrew Morton @ 2025-02-26 21:14 UTC (permalink / raw)
To: mm-commits, yuzhao, yang, willy, wangkefeng.wang, ryan.roberts,
linmiaohe, kirill.shutemov, kasong, jhubbard, hughd, david,
baolin.wang, ziy, akpm
The patch titled
Subject: mm/huge_memory: add folio_split() to debugfs testing interface
has been added to the -mm mm-unstable branch. Its filename is
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-add-folio_split-to-debugfs-testing-interface.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: Zi Yan <ziy@nvidia.com>
Subject: mm/huge_memory: add folio_split() to debugfs testing interface
Date: Wed, 26 Feb 2025 16:00:29 -0500
This allows to test folio_split() by specifying an additional in folio
page offset parameter to split_huge_page debugfs interface.
Link: https://lkml.kernel.org/r/20250226210032.2044041-7-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/huge_memory.c | 47 ++++++++++++++++++++++++++++++++-------------
1 file changed, 34 insertions(+), 13 deletions(-)
--- a/mm/huge_memory.c~mm-huge_memory-add-folio_split-to-debugfs-testing-interface
+++ a/mm/huge_memory.c
@@ -4312,7 +4312,8 @@ static inline bool vma_not_suitable_for_
}
static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
- unsigned long vaddr_end, unsigned int new_order)
+ unsigned long vaddr_end, unsigned int new_order,
+ long in_folio_offset)
{
int ret = 0;
struct task_struct *task;
@@ -4396,8 +4397,16 @@ static int split_huge_pages_pid(int pid,
if (!folio_test_anon(folio) && folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 ||
+ in_folio_offset >= folio_nr_pages(folio)) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
@@ -4420,7 +4429,8 @@ out:
}
static int split_huge_pages_in_file(const char *file_path, pgoff_t off_start,
- pgoff_t off_end, unsigned int new_order)
+ pgoff_t off_end, unsigned int new_order,
+ long in_folio_offset)
{
struct filename *file;
struct file *candidate;
@@ -4469,8 +4479,15 @@ static int split_huge_pages_in_file(cons
if (folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 || in_folio_offset >= nr_pages) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
folio_unlock(folio);
@@ -4503,6 +4520,7 @@ static ssize_t split_huge_pages_write(st
int pid;
unsigned long vaddr_start, vaddr_end;
unsigned int new_order = 0;
+ long in_folio_offset = -1;
ret = mutex_lock_interruptible(&split_debug_mutex);
if (ret)
@@ -4531,30 +4549,33 @@ static ssize_t split_huge_pages_write(st
goto out;
}
- ret = sscanf(tok_buf, "0x%lx,0x%lx,%d", &off_start,
- &off_end, &new_order);
- if (ret != 2 && ret != 3) {
+ ret = sscanf(tok_buf, "0x%lx,0x%lx,%d,%ld", &off_start, &off_end,
+ &new_order, &in_folio_offset);
+ if (ret != 2 && ret != 3 && ret != 4) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_in_file(file_path, off_start, off_end, new_order);
+ ret = split_huge_pages_in_file(file_path, off_start, off_end,
+ new_order, in_folio_offset);
if (!ret)
ret = input_len;
goto out;
}
- ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d", &pid, &vaddr_start, &vaddr_end, &new_order);
+ ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d,%ld", &pid, &vaddr_start,
+ &vaddr_end, &new_order, &in_folio_offset);
if (ret == 1 && pid == 1) {
split_huge_pages_all();
ret = strlen(input_buf);
goto out;
- } else if (ret != 3 && ret != 4) {
+ } else if (ret != 3 && ret != 4 && ret != 5) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order);
+ ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order,
+ in_folio_offset);
if (!ret)
ret = strlen(input_buf);
out:
_
Patches currently in -mm which might be from ziy@nvidia.com are
selftests-mm-make-file-backed-thp-split-work-by-writing-pmd-size-data.patch
mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch
selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
xarray-add-xas_try_split-to-split-a-multi-index-entry.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split.patch
mm-huge_memory-move-folio-split-common-code-to-__folio_split.patch
mm-huge_memory-add-buddy-allocator-like-non-uniform-folio_split.patch
mm-huge_memory-remove-the-old-unused-__split_huge_page.patch
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
mm-truncate-use-buddy-allocator-like-folio-split-for-truncate-operation.patch
selftests-mm-add-tests-for-folio_split-buddy-allocator-like-split.patch
mm-filemap-use-xas_try_split-in-__filemap_add_folio.patch
mm-shmem-use-xas_try_split-in-shmem_split_large_entry.patch
mm-shmem-use-xas_try_split-in-shmem_split_large_entry-fix.patch
^ permalink raw reply [flat|nested] 5+ messages in thread
* + mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch added to mm-unstable branch
@ 2025-03-07 20:27 Andrew Morton
0 siblings, 0 replies; 5+ messages in thread
From: Andrew Morton @ 2025-03-07 20:27 UTC (permalink / raw)
To: mm-commits, yuzhao, yang, willy, wangkefeng.wang, ryan.roberts,
linmiaohe, kirill.shutemov, kasong, jhubbard, hughd, david,
baolin.wang, ziy, akpm
The patch titled
Subject: mm/huge_memory: add folio_split() to debugfs testing interface
has been added to the -mm mm-unstable branch. Its filename is
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-add-folio_split-to-debugfs-testing-interface.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: Zi Yan <ziy@nvidia.com>
Subject: mm/huge_memory: add folio_split() to debugfs testing interface
Date: Fri, 7 Mar 2025 12:39:59 -0500
This allows to test folio_split() by specifying an additional in folio
page offset parameter to split_huge_page debugfs interface.
Link: https://lkml.kernel.org/r/20250307174001.242794-7-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/huge_memory.c | 47 ++++++++++++++++++++++++++++++++-------------
1 file changed, 34 insertions(+), 13 deletions(-)
--- a/mm/huge_memory.c~mm-huge_memory-add-folio_split-to-debugfs-testing-interface
+++ a/mm/huge_memory.c
@@ -4325,7 +4325,8 @@ static inline bool vma_not_suitable_for_
}
static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
- unsigned long vaddr_end, unsigned int new_order)
+ unsigned long vaddr_end, unsigned int new_order,
+ long in_folio_offset)
{
int ret = 0;
struct task_struct *task;
@@ -4409,8 +4410,16 @@ static int split_huge_pages_pid(int pid,
if (!folio_test_anon(folio) && folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 ||
+ in_folio_offset >= folio_nr_pages(folio)) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
@@ -4433,7 +4442,8 @@ out:
}
static int split_huge_pages_in_file(const char *file_path, pgoff_t off_start,
- pgoff_t off_end, unsigned int new_order)
+ pgoff_t off_end, unsigned int new_order,
+ long in_folio_offset)
{
struct filename *file;
struct file *candidate;
@@ -4482,8 +4492,15 @@ static int split_huge_pages_in_file(cons
if (folio->mapping != mapping)
goto unlock;
- if (!split_folio_to_order(folio, target_order))
- split++;
+ if (in_folio_offset < 0 || in_folio_offset >= nr_pages) {
+ if (!split_folio_to_order(folio, target_order))
+ split++;
+ } else {
+ struct page *split_at = folio_page(folio,
+ in_folio_offset);
+ if (!folio_split(folio, target_order, split_at, NULL))
+ split++;
+ }
unlock:
folio_unlock(folio);
@@ -4516,6 +4533,7 @@ static ssize_t split_huge_pages_write(st
int pid;
unsigned long vaddr_start, vaddr_end;
unsigned int new_order = 0;
+ long in_folio_offset = -1;
ret = mutex_lock_interruptible(&split_debug_mutex);
if (ret)
@@ -4544,30 +4562,33 @@ static ssize_t split_huge_pages_write(st
goto out;
}
- ret = sscanf(tok_buf, "0x%lx,0x%lx,%d", &off_start,
- &off_end, &new_order);
- if (ret != 2 && ret != 3) {
+ ret = sscanf(tok_buf, "0x%lx,0x%lx,%d,%ld", &off_start, &off_end,
+ &new_order, &in_folio_offset);
+ if (ret != 2 && ret != 3 && ret != 4) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_in_file(file_path, off_start, off_end, new_order);
+ ret = split_huge_pages_in_file(file_path, off_start, off_end,
+ new_order, in_folio_offset);
if (!ret)
ret = input_len;
goto out;
}
- ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d", &pid, &vaddr_start, &vaddr_end, &new_order);
+ ret = sscanf(input_buf, "%d,0x%lx,0x%lx,%d,%ld", &pid, &vaddr_start,
+ &vaddr_end, &new_order, &in_folio_offset);
if (ret == 1 && pid == 1) {
split_huge_pages_all();
ret = strlen(input_buf);
goto out;
- } else if (ret != 3 && ret != 4) {
+ } else if (ret != 3 && ret != 4 && ret != 5) {
ret = -EINVAL;
goto out;
}
- ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order);
+ ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order,
+ in_folio_offset);
if (!ret)
ret = strlen(input_buf);
out:
_
Patches currently in -mm which might be from ziy@nvidia.com are
mm-migrate-fix-shmem-xarray-update-during-migration.patch
selftests-mm-make-file-backed-thp-split-work-by-writing-pmd-size-data.patch
mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch
selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
xarray-add-xas_try_split-to-split-a-multi-index-entry.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split.patch
mm-huge_memory-move-folio-split-common-code-to-__folio_split.patch
mm-huge_memory-add-buddy-allocator-like-non-uniform-folio_split.patch
mm-huge_memory-remove-the-old-unused-__split_huge_page.patch
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
mm-truncate-use-folio_split-in-truncate-operation.patch
selftests-mm-add-tests-for-folio_split-buddy-allocator-like-split.patch
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2025-03-07 20:27 UTC | newest]
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