From: Peter Zijlstra <peterz@infradead.org>
To: "Christoph Lameter (Ampere)" <cl@gentwo.org>
Cc: tglx@linutronix.de, axboe@kernel.dk,
linux-kernel@vger.kernel.org, mingo@redhat.com,
dvhart@infradead.org, dave@stgolabs.net, 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
Subject: Re: [PATCH v1 11/14] futex: Implement FUTEX2_NUMA
Date: Sat, 26 Oct 2024 09:21:19 +0200 [thread overview]
Message-ID: <20241026072119.GH9767@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <887eadb6-6142-3edf-0a25-d33b2219b90d@gentwo.org>
On Fri, Oct 25, 2024 at 12:36:28PM -0700, Christoph Lameter (Ampere) wrote:
>
> Sorry saw this after the other email.
>
> On Fri, 25 Oct 2024, Peter Zijlstra wrote:
>
> > > Could we follow NUMA policies like with other metadata allocations during
> > > systen call processing?
> >
> > I had a quick look at this, and since the mempolicy stuff is per vma,
> > and we don't have the vma, this is going to be terribly expensive --
> > mmap_lock and all that.
>
> There is a memory policy for the task as a whole that is used for slab
> allocations and allocations that are not vma bound in current->mempolicy.
> Use that.
> You can get a node number following the current task mempolicy by calling
> mempolicy_slab_node() and keep using that node for the future.
I'll look into the per task thing, which I'm hoping means per-process.
We need something that is mm wide consistent.
But since futexes play in the address space, I was really rather
thinking we ought to use the vma policy.
next prev parent reply other threads:[~2024-10-26 7:21 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-21 10:22 [PATCH v1 00/14] futex: More futex2 bits Peter Zijlstra
2023-07-21 10:22 ` [PATCH v1 01/14] futex: Clarify FUTEX2 flags Peter Zijlstra
2023-07-31 16:08 ` Thomas Gleixner
2023-07-21 10:22 ` [PATCH v1 02/14] futex: Extend the " Peter Zijlstra
2023-07-21 15:47 ` Arnd Bergmann
2023-07-21 18:52 ` Peter Zijlstra
2023-07-31 16:11 ` Thomas Gleixner
2023-07-31 16:25 ` Peter Zijlstra
2023-07-31 17:16 ` Thomas Gleixner
2023-07-31 17:35 ` Peter Zijlstra
2023-07-31 20:52 ` Thomas Gleixner
2023-07-31 17:42 ` Thomas Gleixner
2023-07-31 19:20 ` Peter Zijlstra
2023-07-31 21:14 ` Thomas Gleixner
2023-07-31 21:33 ` Peter Zijlstra
2023-07-31 22:43 ` Thomas Gleixner
2023-07-31 22:59 ` Peter Zijlstra
2023-08-01 8:49 ` Thomas Gleixner
2023-08-01 6:02 ` Arnd Bergmann
2023-07-21 10:22 ` [PATCH v1 03/14] futex: Flag conversion Peter Zijlstra
2023-07-31 16:21 ` Thomas Gleixner
2023-07-31 16:26 ` Peter Zijlstra
2023-07-21 10:22 ` [PATCH v1 04/14] futex: Validate futex value against futex size Peter Zijlstra
2023-07-31 17:12 ` Thomas Gleixner
2023-07-21 10:22 ` [PATCH v1 05/14] futex: Add sys_futex_wake() Peter Zijlstra
2023-07-21 15:41 ` Arnd Bergmann
2023-07-21 18:54 ` Peter Zijlstra
2023-07-21 21:23 ` Arnd Bergmann
2023-07-25 7:22 ` Geert Uytterhoeven
2023-07-21 10:22 ` [PATCH v1 06/14] futex: Add sys_futex_wait() Peter Zijlstra
2023-07-25 7:22 ` Geert Uytterhoeven
2023-07-31 16:35 ` Thomas Gleixner
2023-07-21 10:22 ` [PATCH v1 07/14] futex: Propagate flags into get_futex_key() Peter Zijlstra
2023-07-31 16:36 ` Thomas Gleixner
2023-07-21 10:22 ` [PATCH v1 08/14] futex: Add flags2 argument to futex_requeue() Peter Zijlstra
2023-07-31 16:43 ` Thomas Gleixner
2023-07-21 10:22 ` [PATCH v1 09/14] futex: Add sys_futex_requeue() Peter Zijlstra
2023-07-25 7:23 ` Geert Uytterhoeven
2023-07-31 17:19 ` Thomas Gleixner
2023-07-31 17:38 ` Peter Zijlstra
2023-07-21 10:22 ` [PATCH v1 10/14] mm: Add vmalloc_huge_node() Peter Zijlstra
2023-07-24 13:46 ` Christoph Hellwig
2023-07-21 10:22 ` [PATCH v1 11/14] futex: Implement FUTEX2_NUMA Peter Zijlstra
2023-07-21 12:16 ` Peter Zijlstra
2023-07-31 17:36 ` Thomas Gleixner
2023-07-31 18:03 ` Peter Zijlstra
2023-07-31 21:26 ` Thomas Gleixner
2024-06-12 17:07 ` Christoph Lameter (Ampere)
2024-06-12 17:23 ` Christoph Lameter (Ampere)
2024-06-12 17:44 ` Peter Zijlstra
2024-10-25 8:58 ` Peter Zijlstra
2024-10-25 19:36 ` Christoph Lameter (Ampere)
2024-10-26 7:21 ` Peter Zijlstra [this message]
2024-10-28 22:32 ` Christoph Lameter (Ampere)
2023-07-21 10:22 ` [PATCH v1 12/14] futex: Propagate flags into futex_get_value_locked() Peter Zijlstra
2023-07-21 10:22 ` [PATCH v1 13/14] futex: Enable FUTEX2_{8,16} Peter Zijlstra
2023-07-21 10:22 ` [PATCH v1 14/14] futex,selftests: Extend the futex selftests Peter Zijlstra
2023-07-21 14:42 ` [PATCH v1 00/14] futex: More futex2 bits Jens Axboe
2023-07-21 15:49 ` Arnd Bergmann
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