linux-kernel - [PATCH 13/15] stackdepot: add backwards links to hash table buckets

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Message-Id: <e9ed24afd386d12e01c1169c17531f9ce54c0044.1693328501.git.andreyknvl@google.com>
Date:   Tue, 29 Aug 2023 19:11:23 +0200
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 13/15] stackdepot: add backwards links to hash table buckets

From: Andrey Konovalov <andreyknvl@...gle.com>

Maintain links in the stack records to previous entries within the
hash table buckets.

This is preparatory patch for implementing the eviction of stack records
from the stack depot.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 lib/stackdepot.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index a84c0debbb9e..641db97d8c7c 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -58,6 +58,7 @@ union handle_parts {
 
 struct stack_record {
 	struct stack_record *next;	/* Link in hash table or freelist */
+	struct stack_record *prev;	/* Link in hash table */
 	u32 hash;			/* Hash in hash table */
 	u32 size;			/* Number of stored frames */
 	union handle_parts handle;
@@ -493,6 +494,9 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
 
 		if (new) {
 			new->next = *bucket;
+			new->prev = NULL;
+			if (*bucket)
+				(*bucket)->prev = new;
 			*bucket = new;
 			found = new;
 		}
-- 
2.25.1