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mm/page_owner: add debugfs file 'show_stacks_handles'

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Add the file 'show_stacks_handles' to show just stack traces and their
handles, in order to resolve stack traces and handles (i.e., to identify
the stack traces for handles in previous reads from 'show_handles').

All stacks/handles must show up, regardless of their number of pages, that
might have become zero or no longer make 'count_threshold', but made it in
previous reads from 'show_handles' -- and need to be resolved later.

P.S.: now, print the extra newline independently of the number of pages.

Link: https://lkml.kernel.org/r/20251001175611.575861-5-mfo@igalia.com
Signed-off-by: Mauricio Faria de Oliveira <mfo@igalia.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
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 14:56:10 -03:00 committed by Andrew Morton
parent 3b52b9e31a
commit 5513cfbcf4
1 changed files with 8 additions and 2 deletions
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10
mm/page_owner.c
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@ -916,7 +916,8 @@ static int stack_print(struct seq_file *m, void *v)
nr_base_pages = refcount_read(&stack_record->count) - 1;
if (nr_base_pages < 1 || nr_base_pages < page_owner_pages_threshold)
if (ctx->flags & STACK_PRINT_FLAG_PAGES &&
(nr_base_pages < 1 || nr_base_pages < page_owner_pages_threshold))
return 0;
if (ctx->flags & STACK_PRINT_FLAG_STACK) {
@ -928,7 +929,8 @@ static int stack_print(struct seq_file *m, void *v)
if (ctx->flags & STACK_PRINT_FLAG_HANDLE)
seq_printf(m, "handle: %d\n", stack_record->handle.handle);
if (ctx->flags & STACK_PRINT_FLAG_PAGES)
seq_printf(m, "nr_base_pages: %d\n\n", nr_base_pages);
seq_printf(m, "nr_base_pages: %d\n", nr_base_pages);
seq_putc(m, '\n');
return 0;
}
@ -1002,6 +1004,10 @@ static int __init pageowner_init(void)
(void *)(STACK_PRINT_FLAG_HANDLE |
STACK_PRINT_FLAG_PAGES),
&page_owner_stack_operations);
debugfs_create_file("show_stacks_handles", 0400, dir,
(void *)(STACK_PRINT_FLAG_STACK |
STACK_PRINT_FLAG_HANDLE),
&page_owner_stack_operations);
debugfs_create_file("count_threshold", 0600, dir, NULL,
&proc_page_owner_threshold);