linux-kernel - Re: [PATCHv6] mm: slab: free kmem_cache

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Date:	Fri, 5 Feb 2016 19:54:54 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Dmitry Safonov <dsafonov@...tuozzo.com>
CC:	<akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <0x7f454c46@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCHv6] mm: slab: free kmem_cache_node after destroy sysfs file

On Fri, Feb 05, 2016 at 07:44:33PM +0300, Dmitry Safonov wrote:
...
> >>@@ -2414,8 +2415,6 @@ int __kmem_cache_shrink(struct kmem_cache *cachep, bool deactivate)
> >>  int __kmem_cache_shutdown(struct kmem_cache *cachep)
> >>  {
> >>-	int i;
> >>-	struct kmem_cache_node *n;
> >>  	int rc = __kmem_cache_shrink(cachep, false);
> >>  	if (rc)
> >>@@ -2423,6 +2422,14 @@ int __kmem_cache_shutdown(struct kmem_cache *cachep)
> >>  	free_percpu(cachep->cpu_cache);
> >And how come ->cpu_cache (and ->cpu_slab in case of SLUB) is special?
> >Can't sysfs access it either? I propose to introduce a method called
> >__kmem_cache_release (instead of __kmem_cache_free_nodes), which would
> >do all freeing, both per-cpu and per-node.
> AFAICS, they aren't used by this sysfs.

They are: alloc_calls_show -> list_locations -> flush_all accesses
->cpu_slab.

Thanks,
Vladimir

> Anyway, seems reasonable, will do.