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authorOscar Salvador <osalvador@suse.de>2024-02-15 22:59:03 +0100
committerAndrew Morton <akpm@linux-foundation.org>2024-02-23 17:48:17 -0800
commit4bedfb314bdd85c1662ecc46fa25b33b998f994d (patch)
treef38b88cba66f0461a0a24c37e98d0a12a49a24b1 /lib/stackdepot.c
parent8151c7a35d8bd8a12e93538ef7963ea209b6ab41 (diff)
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mm,page_owner: maintain own list of stack_records structs
page_owner needs to increment a stack_record refcount when a new allocation occurs, and decrement it on a free operation. In order to do that, we need to have a way to get a stack_record from a handle. Implement __stack_depot_get_stack_record() which just does that, and make it public so page_owner can use it. Also, traversing all stackdepot buckets comes with its own complexity, plus we would have to implement a way to mark only those stack_records that were originated from page_owner, as those are the ones we are interested in. For that reason, page_owner maintains its own list of stack_records, because traversing that list is faster than traversing all buckets while keeping at the same time a low complexity. For now, add to stack_list only the stack_records of dummy_handle and failure_handle, and set their refcount of 1. Further patches will add code to increment or decrement stack_records count on allocation and free operation. Link: https://lkml.kernel.org/r/20240215215907.20121-4-osalvador@suse.de Signed-off-by: Oscar Salvador <osalvador@suse.de> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Marco Elver <elver@google.com> Acked-by: Andrey Konovalov <andreyknvl@gmail.com> Cc: Alexander Potapenko <glider@google.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib/stackdepot.c')
-rw-r--r--lib/stackdepot.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 514b8d40ff57..8c795bb20afb 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -687,6 +687,14 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries,
}
EXPORT_SYMBOL_GPL(stack_depot_save);
+struct stack_record *__stack_depot_get_stack_record(depot_stack_handle_t handle)
+{
+ if (!handle)
+ return NULL;
+
+ return depot_fetch_stack(handle);
+}
+
unsigned int stack_depot_fetch(depot_stack_handle_t handle,
unsigned long **entries)
{