linux-kernel - Re: [PATCH] mm: slub: annotate kmem_cache_node->list_lock as raw

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Message-ID: <20230413074013.GD4253@hirez.programming.kicks-ass.net>
Date:   Thu, 13 Apr 2023 09:40:13 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qi Zheng <zhengqi.arch@...edance.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        "Zhang, Qiang1" <qiang1.zhang@...el.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "42.hyeyoo@...il.com" <42.hyeyoo@...il.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "roman.gushchin@...ux.dev" <roman.gushchin@...ux.dev>,
        "iamjoonsoo.kim@....com" <iamjoonsoo.kim@....com>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "penberg@...nel.org" <penberg@...nel.org>,
        "cl@...ux.com" <cl@...ux.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Zhao Gongyi <zhaogongyi@...edance.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH] mm: slub: annotate kmem_cache_node->list_lock as
 raw_spinlock

On Thu, Apr 13, 2023 at 12:44:42AM +0800, Qi Zheng wrote:
> > Something like the completely untested below might be of help..

> I just tested the above code, and then got the following
> warning:
> 

> It seems that the LD_WAIT_SLEEP we set is already greater than the
> LD_WAIT_SPIN of the current context.

Yeah, I'm an idiot and got it wrong.. I'll try again later if I manage
to wake up today :-)