From: Davidlohr Bueso <dave@stgolabs.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org,
mingo@redhat.com, dvhart@infradead.org, andrealmeid@igalia.com,
Andrew Morton <akpm@linux-foundation.org>,
urezki@gmail.com, hch@infradead.org, lstoakes@gmail.com,
Arnd Bergmann <arnd@arndb.de>,
linux-api@vger.kernel.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org, malteskarupke@web.de, cl@linux.com,
llong@redhat.com
Subject: Re: [PATCH 2/6] futex: Implement FUTEX2_NUMA
Date: Fri, 25 Oct 2024 11:30:26 -0700 [thread overview]
Message-ID: <i4ljhfndmqrdg5zevd4gf2chmzesfieflxvfj2io2qfhfj4vb7@nicvpjmcdtyu> (raw)
In-Reply-To: <20241025093944.485691531@infradead.org>
On Fri, 25 Oct 2024, Peter Zijlstra wrote:\n
> static int __init futex_init(void)
> {
>- unsigned int futex_shift;
>- unsigned long i;
>+ unsigned int order, n;
>+ unsigned long size, i;
>
> #ifdef CONFIG_BASE_SMALL
> futex_hashsize = 16;
> #else
>- futex_hashsize = roundup_pow_of_two(256 * num_possible_cpus());
>+ futex_hashsize = 256 * num_possible_cpus();
>+ futex_hashsize /= num_possible_nodes();
>+ futex_hashsize = roundup_pow_of_two(futex_hashsize);
> #endif
>+ futex_hashshift = ilog2(futex_hashsize);
>+ size = sizeof(struct futex_hash_bucket) * futex_hashsize;
>+ order = get_order(size);
>+
>+ for_each_node(n) {
Probably want to skip nodes that don't have CPUs, those will never
have the remote for .node value.
next prev parent reply other threads:[~2024-10-25 18:33 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-25 9:03 [PATCH 0/6] futex: The remaining futex2 bits Peter Zijlstra
2024-10-25 9:03 ` [PATCH 1/6] mm: Add vmalloc_huge_node() Peter Zijlstra
2024-10-25 9:58 ` Uladzislau Rezki
2024-10-25 16:00 ` Davidlohr Bueso
2024-10-25 9:03 ` [PATCH 2/6] futex: Implement FUTEX2_NUMA Peter Zijlstra
2024-10-25 18:30 ` Davidlohr Bueso [this message]
2024-10-28 9:38 ` Peter Zijlstra
2024-10-25 19:28 ` Christoph Lameter (Ampere)
2024-10-28 1:59 ` Davidlohr Bueso
2024-10-28 22:34 ` Christoph Lameter (Ampere)
2024-10-28 9:46 ` Peter Zijlstra
2024-10-28 22:37 ` Christoph Lameter (Ampere)
2024-10-25 21:23 ` André Almeida
2024-10-25 9:03 ` [PATCH 3/6] futex: Propagate flags into futex_get_value_locked() Peter Zijlstra
2024-10-25 9:03 ` [PATCH 4/6] futex: Enable FUTEX2_{8,16} Peter Zijlstra
2024-10-25 9:03 ` [PATCH 5/6] futex,selftests: Extend the futex selftests Peter Zijlstra
2024-10-25 9:03 ` [PATCH 6/6] futex,selftests: Extend the futex selftests for NUMA Peter Zijlstra
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