Commit 3b52b9e3 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_handles' 

Add the flag STACK_PRINT_FLAG_HANDLE to print a stack's handle number from
stackdepot, and add the file 'show_handles' to show just handles and their
number of pages.

This is similar to 'show_stacks', with handles instead of stack traces.

Link: https://lkml.kernel.org/r/20251001175611.575861-4-mfo@igalia.com


Signed-off-by: default avatarMauricio Faria de Oliveira <mfo@igalia.com>
Reviewed-by: default avatarOscar 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 5c8ca473

mm/page_owner.c

+7 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ static DEFINE_SPINLOCK(stack_list_lock); 


#define STACK_PRINT_FLAG_STACK		0x1

#define STACK_PRINT_FLAG_PAGES		0x2

#define STACK_PRINT_FLAG_HANDLE		0x4



struct stack_print_ctx {

	struct stack *stack;
@@ -924,6 +925,8 @@ static int stack_print(struct seq_file *m, void *v) 
		for (i = 0; i < nr_entries; i++)

			seq_printf(m, " %pS\n", (void *)entries[i]);

	}

	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);
@@ -995,6 +998,10 @@ static int __init pageowner_init(void) 
			    (void *)(STACK_PRINT_FLAG_STACK |

				     STACK_PRINT_FLAG_PAGES),

			    &page_owner_stack_operations);

	debugfs_create_file("show_handles", 0400, dir,

			    (void *)(STACK_PRINT_FLAG_HANDLE |

				     STACK_PRINT_FLAG_PAGES),

			    &page_owner_stack_operations);

	debugfs_create_file("count_threshold", 0600, dir, NULL,

			    &proc_page_owner_threshold);