Commit 5513cfbc authored by Mauricio Faria de Oliveira's avatar Mauricio Faria de Oliveira Committed by Andrew Morton
Browse files

mm/page_owner: add debugfs file 'show_stacks_handles' 

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: default avatarMauricio 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 3b52b9e3

mm/page_owner.c

+8 −2
Original line number Diff line number Diff line
@@ -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);