linux-kernel - Re: [PATCH 1/2] SLUB: Fix merged slab cache names

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Message-ID: <alpine.DEB.2.00.1009141221310.31857@router.home>
Date:	Tue, 14 Sep 2010 12:26:05 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	torvalds@...ux-founation.org, linux-kernel@...r.kernel.org,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 1/2] SLUB: Fix merged slab cache names

On Tue, 14 Sep 2010, Pekka Enberg wrote:

> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 59260e2..df201cf 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -76,6 +76,8 @@
>  # define SLAB_FAILSLAB		0x00000000UL
>  #endif
>
> +#define SLAB_DYNAMIC_NAME	0x04000000UL	/* s->name is kmalloc()'d */
> +

Put this into mm/slub.c as slub only flag? What is the difference from
refcount == 1?

> @@ -3218,6 +3221,18 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
>  	down_write(&slub_lock);
>  	s = find_mergeable(size, align, flags, name, ctor);
>  	if (s) {
> +		if (!(s->flags & SLAB_DYNAMIC_NAME)) {
> +			const char *new_name;
> +
> +			new_name = kstrdup(s->name, GFP_KERNEL);

Ok. Keeping the original name. Why dont we do strdup by default and always
do a kfree(s->name) on close?

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