linux-kernel - Re: [RFC v2 12/34] mm, slub: move disabling/enabling irqs to ___slab

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Date:   Tue, 06 Jul 2021 06:38:33 +0200
From:   Mike Galbraith <efault@....de>
To:     Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [RFC v2 12/34] mm, slub: move disabling/enabling irqs to
 ___slab_alloc()

Greetings,

On Wed, 2021-06-09 at 13:38 +0200, Vlastimil Babka wrote:
> @@ -3313,6 +3320,8 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s,
> gfp_t flags, size_t size,
>  			 */
>  			c->tid = next_tid(c->tid);
>
> +			local_irq_enable();
> +
>  			/*
>  			 * Invoking slow path likely have side-effect
>  			 * of re-populating per CPU c->freelist

This addition should have been followed by removal of the one in the
error path.  At the end of the series, RT ends up doing a double
local_unlock_irq() instead of post ___slab_alloc() slub_put_cpu_ptr().

	-Mike