linux-kernel - Re: [PATCH v3 3/3] debugobjects: Reduce contention on pool lock in fill

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Message-ID: <87r08st3ey.ffs@tglx>
Date: Mon, 07 Oct 2024 16:04:37 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Zhen Lei <thunder.leizhen@...wei.com>, Andrew Morton
 <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org
Cc: Zhen Lei <thunder.leizhen@...wei.com>
Subject: Re: [PATCH v3 3/3] debugobjects: Reduce contention on pool lock in
 fill_pool()

On Wed, Sep 11 2024 at 16:35, Zhen Lei wrote:
> +	/*
> +	 * Avoid allocation and lock contention when another CPU is already
> +	 * in the allocation path.
> +	 */
> +	if (atomic_read(&cpus_allocating))
> +		return;

Hmm. I really don't want to rely on a single CPU doing allocations in
case that the pool level reached a critical state. That CPU might be
scheduled out and all others are consuming objects up to the point where
the pool becomes empty.

Let me integrate this into the series I'm going to post soon.

Thanks,

        tglx