linux-kernel - Re: [PATCH] debugobjects: Allow to refill the pool before SYSTEM

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Message-ID: <20251114154158.es3XCFy-@linutronix.de>
Date: Fri, 14 Nov 2025 16:41:58 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev
Cc: Thomas Gleixner <tglx@...utronix.de>, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] debugobjects: Allow to refill the pool before
 SYSTEM_SCHEDULING

On 2025-11-06 13:06:28 [+0100], To linux-kernel@...r.kernel.org wrote:
> The pool of free objects is refilled on several occasions such as object
> initialisation. On PREEMPT_RT refilling is limited to preemptible
> sections due to sleeping locks used by the memory allocator. The system
> boots with disabled interrupts so the pool can not be refilled.
> 
> If too many objects are initialized and the pool gets empty then
> debugobjects disables itself.
> 
> Refiling can also happen early in the boot with disabled interrupts as
> long as the scheduler is not operational. If the scheduler can not
> preempt a task then a sleeping lock can not be contended.
> 
> Allow to additionally refill the pool if the scheduler is not
> operational.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

A gentle ping.

Sebastian