From: Thomas Gleixner <tglx@linutronix.de>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
"Dirk Behme" <dirk.behme@gmail.com>,
"Lyude Paul" <lyude@redhat.com>,
rust-for-linux@vger.kernel.org,
"Danilo Krummrich" <dakr@redhat.com>,
airlied@redhat.com, "Ingo Molnar" <mingo@redhat.com>,
will@kernel.org, "Waiman Long" <longman@redhat.com>,
linux-kernel@vger.kernel.org, "Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
wedsonaf@gmail.com, "Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <benno.lossin@proton.me>,
"Andreas Hindborg" <a.hindborg@samsung.com>,
aliceryhl@google.com, "Trevor Gross" <tmgross@umich.edu>
Subject: Re: [POC 1/6] irq & spin_lock: Add counted interrupt disabling/enabling
Date: Fri, 25 Oct 2024 17:04:15 +0200 [thread overview]
Message-ID: <87y12c4428.ffs@tglx> (raw)
In-Reply-To: <ZxrCrlg1XvaTtJ1I@boqun-archlinux>
On Thu, Oct 24 2024 at 14:57, Boqun Feng wrote:
> On Thu, Oct 24, 2024 at 07:22:19PM +0200, Thomas Gleixner wrote:
>> On Thu, Oct 24 2024 at 12:05, Peter Zijlstra wrote:
>> > That is my only concern -- making insane code crash hard is good, making
>> > it silently mostly work but cause random weirdness is not.
>>
>> I wish we could come up with a lightweight check for that.
>>
> Since the preempt part takes exactly one byte in the preempt counter,
> maybe we could use a "incb + jo"?
>
> For example as below, note that since I used OF here, so it will try the
> byte as s8 therefore overflow at 128, so 127 is the max level of
> nesting.
>
> Would this be a relatively lightweight check?
That's definitely an interesting thought, though it adds a conditional
into preempt_disable(). We should try and see whether it's significant.
Thanks,
tglx
next prev parent reply other threads:[~2024-10-25 15:04 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-16 21:28 [PATCH v6 0/3] rust: Add irq abstraction, SpinLockIrq Lyude Paul
2024-09-16 21:28 ` [PATCH v6 1/3] rust: Introduce irq module Lyude Paul
2024-09-29 20:36 ` Trevor Gross
2024-09-29 23:45 ` Boqun Feng
2024-10-02 20:20 ` Thomas Gleixner
2024-10-04 8:58 ` Benno Lossin
2024-10-04 17:18 ` Lyude Paul
2024-10-17 18:51 ` Lyude Paul
2024-10-04 17:02 ` Lyude Paul
2024-10-10 21:00 ` Daniel Almeida
2024-09-16 21:28 ` [PATCH v6 2/3] rust: sync: Introduce lock::Backend::Context Lyude Paul
2024-09-29 20:40 ` Trevor Gross
2024-09-29 23:52 ` Boqun Feng
2024-09-16 21:28 ` [PATCH v6 3/3] rust: sync: Add SpinLockIrq Lyude Paul
2024-09-29 20:50 ` Trevor Gross
2024-09-29 23:59 ` Boqun Feng
2024-10-02 20:53 ` Thomas Gleixner
2024-10-03 12:51 ` Boqun Feng
2024-10-04 18:48 ` Lyude Paul
2024-10-05 18:19 ` Lyude Paul
2024-10-07 12:42 ` Boqun Feng
2024-10-07 18:13 ` Lyude Paul
2024-10-15 12:57 ` Andreas Hindborg
2024-10-15 20:17 ` Boqun Feng
2024-10-15 20:21 ` Boqun Feng
2024-10-16 20:57 ` Lyude Paul
2024-10-17 13:34 ` Andreas Hindborg
2024-10-07 12:01 ` Thomas Gleixner
2024-10-07 18:30 ` Lyude Paul
2024-10-08 15:21 ` Thomas Gleixner
2024-10-12 8:01 ` Boqun Feng
2024-10-10 16:39 ` [PATCH v6 0/3] rust: Add irq abstraction, SpinLockIrq Daniel Almeida
2024-10-12 5:29 ` Dirk Behme
2024-10-13 19:06 ` Thomas Gleixner
2024-10-13 21:43 ` Boqun Feng
2024-10-16 21:00 ` Thomas Gleixner
2024-10-16 21:31 ` Boqun Feng
2024-10-17 20:49 ` Lyude Paul
2024-10-17 22:27 ` Boqun Feng
2024-10-18 5:51 ` [POC 0/6] Allow SpinLockIrq to use a normal Guard interface Boqun Feng
2024-10-18 5:51 ` [POC 1/6] irq & spin_lock: Add counted interrupt disabling/enabling Boqun Feng
2024-10-21 7:04 ` kernel test robot
2024-10-21 7:35 ` kernel test robot
2024-10-21 20:44 ` Lyude Paul
2024-10-24 16:18 ` Peter Zijlstra
2024-10-23 19:34 ` Thomas Gleixner
2024-10-23 19:51 ` Peter Zijlstra
2024-10-23 20:38 ` Thomas Gleixner
2024-10-24 10:05 ` Peter Zijlstra
2024-10-24 17:22 ` Thomas Gleixner
2024-10-24 21:57 ` Boqun Feng
2024-10-25 15:04 ` Thomas Gleixner [this message]
2024-10-25 18:28 ` Peter Zijlstra
2024-10-24 19:12 ` Lyude Paul
2025-07-24 20:36 ` w/r/t "irq & spin_lock: Add counted interrupt disabling/enabling": holes in pcpu_hot? Lyude Paul
2025-07-24 21:59 ` Thomas Gleixner
2024-10-24 5:05 ` [POC 1/6] irq & spin_lock: Add counted interrupt disabling/enabling Boqun Feng
2024-10-24 8:17 ` Thomas Gleixner
2024-10-24 16:20 ` Boqun Feng
2024-10-18 5:51 ` [POC 2/6] rust: Introduce interrupt module Boqun Feng
2024-10-31 20:45 ` Lyude Paul
2024-10-31 20:47 ` Lyude Paul
2024-10-18 5:51 ` [POC 3/6] rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers Boqun Feng
2024-10-18 5:51 ` [POC 4/6] rust: sync: Add SpinLockIrq Boqun Feng
2024-10-18 19:23 ` Lyude Paul
2024-10-18 20:22 ` Boqun Feng
2024-10-18 5:51 ` [POC 5/6] rust: sync: Introduce lock::Backend::Context Boqun Feng
2024-10-31 20:54 ` Lyude Paul
2024-10-18 5:51 ` [POC 6/6] rust: sync: lock: Add `Backend::BackendInContext` Boqun Feng
2024-10-18 10:22 ` [POC 0/6] Allow SpinLockIrq to use a normal Guard interface Andreas Hindborg
2024-10-18 12:42 ` Boqun Feng
2024-10-18 11:16 ` Andreas Hindborg
2024-10-18 16:05 ` Dirk Behme
2024-10-31 20:56 ` Lyude Paul
2024-10-17 20:42 ` [PATCH v6 0/3] rust: Add irq abstraction, SpinLockIrq Lyude Paul
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