From: Peter Zijlstra <peterz@infradead.org>
To: Gary Guo <gary@garyguo.net>
Cc: "Lyude Paul" <lyude@redhat.com>,
rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
"Thomas Gleixner" <tglx@linutronix.de>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Daniel Almeida" <daniel.almeida@collabora.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Ingo Molnar" <mingo@redhat.com>, "Will Deacon" <will@kernel.org>,
"Waiman Long" <longman@redhat.com>,
"Joel Fernandes" <joelagnelf@nvidia.com>
Subject: Re: [PATCH v17 02/16] preempt: Track NMI nesting to separate per-CPU counter
Date: Wed, 4 Feb 2026 14:00:27 +0100 [thread overview]
Message-ID: <20260204130027.GE3016024@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <DG66HSCEA3XP.36DNV6A9HRNOK@garyguo.net>
On Wed, Feb 04, 2026 at 12:32:45PM +0000, Gary Guo wrote:
> On Wed Feb 4, 2026 at 11:12 AM GMT, Peter Zijlstra wrote:
> > On Tue, Feb 03, 2026 at 01:15:21PM +0100, Peter Zijlstra wrote:
> >> But I'm really somewhat sad that 64bit can't do better than this.
> >
> > Here, the below builds and boots (albeit with warnings because printf
> > format crap sucks).
>
> Hi Peter,
>
> I am not sure if it's worth the complexity to do this for the NMI code path.
> I don't think NMI code path is hot enough that this is necessary?
Perf uses NMI. Also, the 64bit code is actually simpler.
next prev parent reply other threads:[~2026-02-04 13:00 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-21 22:39 [PATCH v17 00/16] Refcounted interrupts, SpinLockIrq for rust Lyude Paul
2026-01-21 22:39 ` [PATCH v17 01/16] preempt: Introduce HARDIRQ_DISABLE_BITS Lyude Paul
2026-01-21 22:39 ` [PATCH v17 02/16] preempt: Track NMI nesting to separate per-CPU counter Lyude Paul
2026-02-03 11:44 ` Peter Zijlstra
2026-02-06 1:22 ` Joel Fernandes
2026-02-03 12:15 ` Peter Zijlstra
2026-02-04 11:12 ` Peter Zijlstra
2026-02-04 12:32 ` Gary Guo
2026-02-04 13:00 ` Peter Zijlstra [this message]
2026-02-05 21:40 ` Boqun Feng
2026-02-05 22:17 ` Joel Fernandes
2026-02-06 0:50 ` Joel Fernandes
2026-02-06 1:14 ` Boqun Feng
2026-02-06 1:24 ` Joel Fernandes
2026-02-06 2:51 ` Boqun Feng
2026-02-06 8:13 ` Joel Fernandes
2026-02-06 15:28 ` Boqun Feng
2026-02-06 16:00 ` Joel Fernandes
2026-02-06 16:16 ` Boqun Feng
2026-02-07 22:11 ` Joel Fernandes
2026-02-06 8:42 ` Peter Zijlstra
2026-02-05 22:07 ` Boqun Feng
2026-02-06 8:45 ` Peter Zijlstra
2026-01-21 22:39 ` [PATCH v17 03/16] preempt: Introduce __preempt_count_{sub, add}_return() Lyude Paul
2026-01-21 22:39 ` [PATCH v17 04/16] openrisc: Include <linux/cpumask.h> in smp.h Lyude Paul
2026-01-21 22:39 ` [PATCH v17 05/16] irq & spin_lock: Add counted interrupt disabling/enabling Lyude Paul
2026-01-21 22:39 ` [PATCH v17 06/16] irq: Add KUnit test for refcounted interrupt enable/disable Lyude Paul
2026-01-30 7:43 ` David Gow
2026-01-21 22:39 ` [PATCH v17 07/16] rust: Introduce interrupt module Lyude Paul
2026-01-21 22:39 ` [PATCH v17 08/16] rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers Lyude Paul
2026-01-26 13:25 ` Gary Guo
2026-01-21 22:39 ` [PATCH v17 09/16] rust: sync: Add SpinLockIrq Lyude Paul
2026-01-23 22:26 ` Benno Lossin
2026-01-21 22:39 ` [PATCH v17 10/16] rust: sync: Introduce lock::Lock::lock_with() and friends Lyude Paul
2026-01-22 11:56 ` kernel test robot
2026-01-23 22:55 ` Benno Lossin
2026-01-26 13:31 ` Gary Guo
2026-01-21 22:39 ` [PATCH v17 11/16] rust: sync: Expose lock::Backend Lyude Paul
2026-01-23 22:56 ` Benno Lossin
2026-01-21 22:39 ` [PATCH v17 12/16] rust: sync: lock/global: Rename B to G in trait bounds Lyude Paul
2026-01-21 22:39 ` [PATCH v17 13/16] rust: sync: Add a lifetime parameter to lock::global::GlobalGuard Lyude Paul
2026-01-21 22:39 ` [PATCH v17 14/16] rust: sync: lock/global: Add Backend parameter to GlobalGuard Lyude Paul
2026-01-21 22:39 ` [PATCH v17 15/16] rust: sync: lock/global: Add ContextualBackend support to GlobalLock Lyude Paul
2026-01-21 22:39 ` [PATCH v17 16/16] locking: Switch to _irq_{disable,enable}() variants in cleanup guards Lyude Paul
2026-01-26 13:24 ` [PATCH v17 00/16] Refcounted interrupts, SpinLockIrq for rust Gary Guo
2026-01-26 16:17 ` Boqun Feng
2026-02-03 0:36 ` Boqun Feng
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