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Message-ID: <20241026224306.982896-4-bigeasy@linutronix.de>
Date: Sun, 27 Oct 2024 00:34:52 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: André Almeida <andrealmeid@...lia.com>,
Darren Hart <dvhart@...radead.org>,
Davidlohr Bueso <dave@...olabs.net>,
Ingo Molnar <mingo@...hat.com>,
Juri Lelli <juri.lelli@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Valentin Schneider <vschneid@...hat.com>,
Waiman Long <longman@...hat.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [RFC PATCH 3/3] futex: Use the task local hashmap.
Use the hashlocal hashmap if provided.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
kernel/futex/core.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 7c97fc96f84a3..ee5a6902154c5 100644
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c
@@ -119,13 +119,18 @@ late_initcall(fail_futex_debugfs);
* @key: Pointer to the futex key for which the hash is calculated
*
* We hash on the keys returned from get_futex_key (see below) and return the
- * corresponding hash bucket in the global hash.
+ * corresponding hash bucket in the global hash. If the FUTEX is private and
+ * a local hash table is privated then this one is used.
*/
struct futex_hash_bucket *futex_hash(union futex_key *key)
{
+ struct futex_hash_table *fht;
u32 hash = jhash2((u32 *)key, offsetof(typeof(*key), both.offset) / 4,
key->both.offset);
+ fht = current->futex_hash_table;
+ if (fht && (key->both.offset & (FUT_OFF_INODE | FUT_OFF_MMSHARED)) == 0)
+ return &fht->queues[hash & (fht->slots - 1)];
return &futex_queues[hash & (futex_hashsize - 1)];
}
--
2.45.2
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