* + mmpage_owner-display-all-stacks-and-their-count.patch added to mm-unstable branch
@ 2024-02-12 23:28 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2024-02-12 23:28 UTC (permalink / raw)
To: mm-commits, vbabka, mhocko, glider, elver, andreyknvl, osalvador,
akpm
The patch titled
Subject: mm,page_owner: display all stacks and their count
has been added to the -mm mm-unstable branch. Its filename is
mmpage_owner-display-all-stacks-and-their-count.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mmpage_owner-display-all-stacks-and-their-count.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: Oscar Salvador <osalvador@suse.de>
Subject: mm,page_owner: display all stacks and their count
Date: Mon, 12 Feb 2024 23:30:27 +0100
This patch adds a new directory called 'page_owner_stacks' under
/sys/kernel/debug/, with a file called 'show_stacks' in it. Reading from
that file will show all stacks that were added by page_owner followed by
their counting, giving us a clear overview of stack <-> count
relationship.
E.g:
prep_new_page+0xa9/0x120
get_page_from_freelist+0x801/0x2210
__alloc_pages+0x18b/0x350
alloc_pages_mpol+0x91/0x1f0
folio_alloc+0x14/0x50
filemap_alloc_folio+0xb2/0x100
__filemap_get_folio+0x14a/0x490
ext4_write_begin+0xbd/0x4b0 [ext4]
generic_perform_write+0xc1/0x1e0
ext4_buffered_write_iter+0x68/0xe0 [ext4]
ext4_file_write_iter+0x70/0x740 [ext4]
vfs_write+0x33d/0x420
ksys_write+0xa5/0xe0
do_syscall_64+0x80/0x160
entry_SYSCALL_64_after_hwframe+0x6e/0x76
stack_count: 4578
The seq stack_{start,next} functions will iterate through the list
stack_list in order to print all stacks.
Link: https://lkml.kernel.org/r/20240212223029.30769-4-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Marco Elver <elver@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/page_owner.c | 99 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 98 insertions(+), 1 deletion(-)
--- a/mm/page_owner.c~mmpage_owner-display-all-stacks-and-their-count
+++ a/mm/page_owner.c
@@ -84,7 +84,12 @@ static void add_stack_record_to_list(str
stack_list = stack;
} else {
stack->next = stack_list;
- stack_list = stack;
+ /* This pairs with smp_load_acquire() from function
+ * stack_start(). This guarantees that stack_start()
+ * will see an updated stack_list before starting to
+ * traverse the list.
+ */
+ smp_store_release(&stack_list, stack);
}
spin_unlock_irqrestore(&stack_list_lock, flags);
}
@@ -792,8 +797,97 @@ static const struct file_operations proc
.llseek = lseek_page_owner,
};
+static void *stack_start(struct seq_file *m, loff_t *ppos)
+{
+ struct stack *stack;
+
+ if (*ppos == -1UL)
+ return NULL;
+
+ if (!*ppos) {
+ /*
+ * This pairs with smp_store_release() from function
+ * add_stack_record_to_list(), so we get a consistent
+ * value of stack_list.
+ */
+ stack = smp_load_acquire(&stack_list);
+ } else {
+ stack = m->private;
+ stack = stack->next;
+ }
+
+ m->private = stack;
+
+ return stack;
+}
+
+static void *stack_next(struct seq_file *m, void *v, loff_t *ppos)
+{
+ struct stack *stack = v;
+
+ stack = stack->next;
+ *ppos = stack ? *ppos + 1 : -1UL;
+ m->private = stack;
+
+ return stack;
+}
+
+static int stack_print(struct seq_file *m, void *v)
+{
+ char *buf;
+ int ret = 0;
+ struct stack *stack = v;
+ struct stack_record *stack_record = stack->stack_record;
+
+ if (!stack_record->size || stack_record->size < 0 ||
+ refcount_read(&stack_record->count) < 2)
+ return 0;
+
+ buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+
+ ret += stack_trace_snprint(buf, PAGE_SIZE, stack_record->entries,
+ stack_record->size, 0);
+ if (!ret)
+ goto out;
+
+ scnprintf(buf + ret, PAGE_SIZE - ret, "stack_count: %d\n\n",
+ refcount_read(&stack_record->count));
+
+ seq_printf(m, buf);
+ seq_puts(m, "\n\n");
+out:
+ kfree(buf);
+
+ return 0;
+}
+
+static void stack_stop(struct seq_file *m, void *v)
+{
+}
+
+static const struct seq_operations page_owner_stack_op = {
+ .start = stack_start,
+ .next = stack_next,
+ .stop = stack_stop,
+ .show = stack_print
+};
+
+static int page_owner_stack_open(struct inode *inode, struct file *file)
+{
+ return seq_open_private(file, &page_owner_stack_op, 0);
+}
+
+static const struct file_operations page_owner_stack_operations = {
+ .open = page_owner_stack_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
static int __init pageowner_init(void)
{
+ struct dentry *dir;
+
if (!static_branch_unlikely(&page_owner_inited)) {
pr_info("page_owner is disabled\n");
return 0;
@@ -801,6 +895,9 @@ static int __init pageowner_init(void)
debugfs_create_file("page_owner", 0400, NULL, NULL,
&proc_page_owner_operations);
+ dir = debugfs_create_dir("page_owner_stacks", NULL);
+ debugfs_create_file("show_stacks", 0400, dir, NULL,
+ &page_owner_stack_operations);
return 0;
}
_
Patches currently in -mm which might be from osalvador@suse.de are
lib-stackdepot-move-stack_record-struct-definition-into-the-header.patch
mmpage_owner-implement-the-tracking-of-the-stacks-count.patch
mmpage_owner-display-all-stacks-and-their-count.patch
mmpage_owner-filter-out-stacks-by-a-threshold.patch
mmpage_owner-update-documentation-regarding-page_owner_stacks.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
* + mmpage_owner-display-all-stacks-and-their-count.patch added to mm-unstable branch
@ 2024-02-14 18:32 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2024-02-14 18:32 UTC (permalink / raw)
To: mm-commits, vbabka, mhocko, glider, elver, andreyknvl, osalvador,
akpm
The patch titled
Subject: mm,page_owner: display all stacks and their count
has been added to the -mm mm-unstable branch. Its filename is
mmpage_owner-display-all-stacks-and-their-count.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mmpage_owner-display-all-stacks-and-their-count.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: Oscar Salvador <osalvador@suse.de>
Subject: mm,page_owner: display all stacks and their count
Date: Wed, 14 Feb 2024 18:01:55 +0100
This patch adds a new directory called 'page_owner_stacks' under
/sys/kernel/debug/, with a file called 'show_stacks' in it. Reading from
that file will show all stacks that were added by page_owner followed by
their counting, giving us a clear overview of stack <-> count
relationship.
E.g:
prep_new_page+0xa9/0x120
get_page_from_freelist+0x801/0x2210
__alloc_pages+0x18b/0x350
alloc_pages_mpol+0x91/0x1f0
folio_alloc+0x14/0x50
filemap_alloc_folio+0xb2/0x100
__filemap_get_folio+0x14a/0x490
ext4_write_begin+0xbd/0x4b0 [ext4]
generic_perform_write+0xc1/0x1e0
ext4_buffered_write_iter+0x68/0xe0 [ext4]
ext4_file_write_iter+0x70/0x740 [ext4]
vfs_write+0x33d/0x420
ksys_write+0xa5/0xe0
do_syscall_64+0x80/0x160
entry_SYSCALL_64_after_hwframe+0x6e/0x76
stack_count: 4578
The seq stack_{start,next} functions will iterate through the list
stack_list in order to print all stacks.
Link: https://lkml.kernel.org/r/20240214170157.17530-6-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/page_owner.c | 93 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 92 insertions(+), 1 deletion(-)
--- a/mm/page_owner.c~mmpage_owner-display-all-stacks-and-their-count
+++ a/mm/page_owner.c
@@ -171,7 +171,13 @@ static void add_stack_record_to_list(str
spin_lock_irqsave(&stack_list_lock, flags);
stack->next = stack_list;
- stack_list = stack;
+ /*
+ * This pairs with smp_load_acquire() from function
+ * stack_start(). This guarantees that stack_start()
+ * will see an updated stack_list before starting to
+ * traverse the list.
+ */
+ smp_store_release(&stack_list, stack);
spin_unlock_irqrestore(&stack_list_lock, flags);
}
@@ -805,8 +811,90 @@ static const struct file_operations proc
.llseek = lseek_page_owner,
};
+static void *stack_start(struct seq_file *m, loff_t *ppos)
+{
+ struct stack *stack;
+
+ if (*ppos == -1UL)
+ return NULL;
+
+ if (!*ppos) {
+ /*
+ * This pairs with smp_store_release() from function
+ * add_stack_record_to_list(), so we get a consistent
+ * value of stack_list.
+ */
+ stack = smp_load_acquire(&stack_list);
+ } else {
+ stack = m->private;
+ stack = stack->next;
+ }
+
+ m->private = stack;
+
+ return stack;
+}
+
+static void *stack_next(struct seq_file *m, void *v, loff_t *ppos)
+{
+ struct stack *stack = v;
+
+ stack = stack->next;
+ *ppos = stack ? *ppos + 1 : -1UL;
+ m->private = stack;
+
+ return stack;
+}
+
+static int stack_print(struct seq_file *m, void *v)
+{
+ int i;
+ struct stack *stack = v;
+ unsigned long *entries;
+ unsigned long nr_entries;
+ struct stack_record *stack_record = stack->stack_record;
+
+ nr_entries = stack_record->size;
+ entries = stack_record->entries;
+
+ if (!nr_entries || nr_entries < 0 ||
+ refcount_read(&stack_record->count) < 2)
+ return 0;
+
+ for (i = 0; i < nr_entries; i++)
+ seq_printf(m, " %pS\n", (void *)entries[i]);
+ seq_printf(m, "stack_count: %d\n\n", refcount_read(&stack_record->count));
+
+ return 0;
+}
+
+static void stack_stop(struct seq_file *m, void *v)
+{
+}
+
+static const struct seq_operations page_owner_stack_op = {
+ .start = stack_start,
+ .next = stack_next,
+ .stop = stack_stop,
+ .show = stack_print
+};
+
+static int page_owner_stack_open(struct inode *inode, struct file *file)
+{
+ return seq_open_private(file, &page_owner_stack_op, 0);
+}
+
+static const struct file_operations page_owner_stack_operations = {
+ .open = page_owner_stack_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
static int __init pageowner_init(void)
{
+ struct dentry *dir;
+
if (!static_branch_unlikely(&page_owner_inited)) {
pr_info("page_owner is disabled\n");
return 0;
@@ -814,6 +902,9 @@ static int __init pageowner_init(void)
debugfs_create_file("page_owner", 0400, NULL, NULL,
&proc_page_owner_operations);
+ dir = debugfs_create_dir("page_owner_stacks", NULL);
+ debugfs_create_file("show_stacks", 0400, dir, NULL,
+ &page_owner_stack_operations);
return 0;
}
_
Patches currently in -mm which might be from osalvador@suse.de are
lib-stackdepot-fix-first-entry-having-a-0-handle.patch
lib-stackdepot-move-stack_record-struct-definition-into-the-header.patch
mmpage_owner-maintain-own-list-of-stack_records-structs.patch
mmpage_owner-implement-the-tracking-of-the-stacks-count.patch
mmpage_owner-display-all-stacks-and-their-count.patch
mmpage_owner-filter-out-stacks-by-a-threshold.patch
mmpage_owner-update-documentation-regarding-page_owner_stacks.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
* + mmpage_owner-display-all-stacks-and-their-count.patch added to mm-unstable branch
@ 2024-02-15 23:34 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2024-02-15 23:34 UTC (permalink / raw)
To: mm-commits, vbabka, mhocko, glider, elver, andreyknvl, osalvador,
akpm
The patch titled
Subject: mm,page_owner: display all stacks and their count
has been added to the -mm mm-unstable branch. Its filename is
mmpage_owner-display-all-stacks-and-their-count.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mmpage_owner-display-all-stacks-and-their-count.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: Oscar Salvador <osalvador@suse.de>
Subject: mm,page_owner: display all stacks and their count
Date: Thu, 15 Feb 2024 22:59:05 +0100
This patch adds a new directory called 'page_owner_stacks' under
/sys/kernel/debug/, with a file called 'show_stacks' in it. Reading from
that file will show all stacks that were added by page_owner followed by
their counting, giving us a clear overview of stack <-> count
relationship.
E.g:
prep_new_page+0xa9/0x120
get_page_from_freelist+0x801/0x2210
__alloc_pages+0x18b/0x350
alloc_pages_mpol+0x91/0x1f0
folio_alloc+0x14/0x50
filemap_alloc_folio+0xb2/0x100
__filemap_get_folio+0x14a/0x490
ext4_write_begin+0xbd/0x4b0 [ext4]
generic_perform_write+0xc1/0x1e0
ext4_buffered_write_iter+0x68/0xe0 [ext4]
ext4_file_write_iter+0x70/0x740 [ext4]
vfs_write+0x33d/0x420
ksys_write+0xa5/0xe0
do_syscall_64+0x80/0x160
entry_SYSCALL_64_after_hwframe+0x6e/0x76
stack_count: 4578
The seq stack_{start,next} functions will iterate through the list
stack_list in order to print all stacks.
Link: https://lkml.kernel.org/r/20240215215907.20121-6-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Marco Elver <elver@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/page_owner.c | 93 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 92 insertions(+), 1 deletion(-)
--- a/mm/page_owner.c~mmpage_owner-display-all-stacks-and-their-count
+++ a/mm/page_owner.c
@@ -171,7 +171,13 @@ static void add_stack_record_to_list(str
spin_lock_irqsave(&stack_list_lock, flags);
stack->next = stack_list;
- stack_list = stack;
+ /*
+ * This pairs with smp_load_acquire() from function
+ * stack_start(). This guarantees that stack_start()
+ * will see an updated stack_list before starting to
+ * traverse the list.
+ */
+ smp_store_release(&stack_list, stack);
spin_unlock_irqrestore(&stack_list_lock, flags);
}
@@ -805,8 +811,90 @@ static const struct file_operations proc
.llseek = lseek_page_owner,
};
+static void *stack_start(struct seq_file *m, loff_t *ppos)
+{
+ struct stack *stack;
+
+ if (*ppos == -1UL)
+ return NULL;
+
+ if (!*ppos) {
+ /*
+ * This pairs with smp_store_release() from function
+ * add_stack_record_to_list(), so we get a consistent
+ * value of stack_list.
+ */
+ stack = smp_load_acquire(&stack_list);
+ } else {
+ stack = m->private;
+ stack = stack->next;
+ }
+
+ m->private = stack;
+
+ return stack;
+}
+
+static void *stack_next(struct seq_file *m, void *v, loff_t *ppos)
+{
+ struct stack *stack = v;
+
+ stack = stack->next;
+ *ppos = stack ? *ppos + 1 : -1UL;
+ m->private = stack;
+
+ return stack;
+}
+
+static int stack_print(struct seq_file *m, void *v)
+{
+ int i, stack_count;
+ struct stack *stack = v;
+ unsigned long *entries;
+ unsigned long nr_entries;
+ struct stack_record *stack_record = stack->stack_record;
+
+ nr_entries = stack_record->size;
+ entries = stack_record->entries;
+ stack_count = refcount_read(&stack_record->count) - 1;
+
+ if (!nr_entries || nr_entries < 0 || stack_count < 1)
+ return 0;
+
+ for (i = 0; i < nr_entries; i++)
+ seq_printf(m, " %pS\n", (void *)entries[i]);
+ seq_printf(m, "stack_count: %d\n\n", stack_count);
+
+ return 0;
+}
+
+static void stack_stop(struct seq_file *m, void *v)
+{
+}
+
+static const struct seq_operations page_owner_stack_op = {
+ .start = stack_start,
+ .next = stack_next,
+ .stop = stack_stop,
+ .show = stack_print
+};
+
+static int page_owner_stack_open(struct inode *inode, struct file *file)
+{
+ return seq_open_private(file, &page_owner_stack_op, 0);
+}
+
+static const struct file_operations page_owner_stack_operations = {
+ .open = page_owner_stack_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
static int __init pageowner_init(void)
{
+ struct dentry *dir;
+
if (!static_branch_unlikely(&page_owner_inited)) {
pr_info("page_owner is disabled\n");
return 0;
@@ -814,6 +902,9 @@ static int __init pageowner_init(void)
debugfs_create_file("page_owner", 0400, NULL, NULL,
&proc_page_owner_operations);
+ dir = debugfs_create_dir("page_owner_stacks", NULL);
+ debugfs_create_file("show_stacks", 0400, dir, NULL,
+ &page_owner_stack_operations);
return 0;
}
_
Patches currently in -mm which might be from osalvador@suse.de are
lib-stackdepot-fix-first-entry-having-a-0-handle.patch
lib-stackdepot-move-stack_record-struct-definition-into-the-header.patch
mmpage_owner-maintain-own-list-of-stack_records-structs.patch
mmpage_owner-implement-the-tracking-of-the-stacks-count.patch
mmpage_owner-display-all-stacks-and-their-count.patch
mmpage_owner-filter-out-stacks-by-a-threshold.patch
mmpage_owner-update-documentation-regarding-page_owner_stacks.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-02-15 23:34 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2024-02-14 18:32 + mmpage_owner-display-all-stacks-and-their-count.patch added to mm-unstable branch Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2024-02-15 23:34 Andrew Morton
2024-02-12 23:28 Andrew Morton
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