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mm/page_owner: add struct stack_print_ctx.flags

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Add the flags field to stack_print_ctx, and define two flags for current
behavior (printing stack traces and their number of base pages).

The plumbing of flags is debugfs_create_file(data) -> inode.i_private ->
page_owner_stack_open() -> stack_print_ctx.flags -> stack_print().

No behavior change intended.

Link: https://lkml.kernel.org/r/20251001175611.575861-3-mfo@igalia.com
Signed-off-by: Mauricio Faria de Oliveira <mfo@igalia.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mauricio Faria de Oliveira 2025-10-01 14:56:08 -03:00 committed by Andrew Morton
parent 156c0c5d14
commit 5c8ca473d5
1 changed files with 23 additions and 6 deletions
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29
mm/page_owner.c
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@ -45,8 +45,12 @@ static struct stack failure_stack;
static struct stack *stack_list;
static DEFINE_SPINLOCK(stack_list_lock);
#define STACK_PRINT_FLAG_STACK 0x1
#define STACK_PRINT_FLAG_PAGES 0x2
struct stack_print_ctx {
struct stack *stack;
u8 flags;
};
static bool page_owner_enabled __initdata;
@ -904,20 +908,24 @@ static int stack_print(struct seq_file *m, void *v)
unsigned long *entries;
unsigned long nr_entries;
struct stack_record *stack_record = stack->stack_record;
struct stack_print_ctx *ctx = m->private;
if (!stack->stack_record)
return 0;
nr_entries = stack_record->size;
entries = stack_record->entries;
nr_base_pages = refcount_read(&stack_record->count) - 1;
if (nr_base_pages < 1 || nr_base_pages < page_owner_pages_threshold)
return 0;
for (i = 0; i < nr_entries; i++)
seq_printf(m, " %pS\n", (void *)entries[i]);
seq_printf(m, "nr_base_pages: %d\n\n", nr_base_pages);
if (ctx->flags & STACK_PRINT_FLAG_STACK) {
nr_entries = stack_record->size;
entries = stack_record->entries;
for (i = 0; i < nr_entries; i++)
seq_printf(m, " %pS\n", (void *)entries[i]);
}
if (ctx->flags & STACK_PRINT_FLAG_PAGES)
seq_printf(m, "nr_base_pages: %d\n\n", nr_base_pages);
return 0;
}
@ -938,6 +946,13 @@ static int page_owner_stack_open(struct inode *inode, struct file *file)
int ret = seq_open_private(file, &page_owner_stack_op,
sizeof(struct stack_print_ctx));
if (!ret) {
struct seq_file *m = file->private_data;
struct stack_print_ctx *ctx = m->private;
ctx->flags = (uintptr_t) inode->i_private;
}
return ret;
}
@ -976,7 +991,9 @@ 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,
debugfs_create_file("show_stacks", 0400, dir,
(void *)(STACK_PRINT_FLAG_STACK |
STACK_PRINT_FLAG_PAGES),
&page_owner_stack_operations);
debugfs_create_file("count_threshold", 0600, dir, NULL,
&proc_page_owner_threshold);