linux-kernel - Re: [RFC PATCH 1/5] mm, slab/slub: introduce kmalloc-reclaimable caches

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Date:   Fri, 25 May 2018 15:51:57 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Vlastimil Babka <vbabka@...e.cz>
cc:     linux-mm@...ck.org, Roman Gushchin <guro@...com>,
        Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vijayanand Jitta <vjitta@...eaurora.org>
Subject: Re: [RFC PATCH 1/5] mm, slab/slub: introduce kmalloc-reclaimable
 caches

On Thu, 24 May 2018, Vlastimil Babka wrote:

> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 9ebe659bd4a5..5bff0571b360 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -296,11 +296,16 @@ static inline void __check_heap_object(const void *ptr, unsigned long n,
>                                 (KMALLOC_MIN_SIZE) : 16)
>
>  #ifndef CONFIG_SLOB
> -extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
> +extern struct kmem_cache *kmalloc_caches[2][KMALLOC_SHIFT_HIGH + 1];
>  #ifdef CONFIG_ZONE_DMA
>  extern struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
>  #endif

In the existing code we used a different array name for the DMA caches.
This is a similar situation.

I would suggest to use

kmalloc_reclaimable_caches[]

or make it consistent by folding the DMA caches into the array too (but
then note the issues below).

> @@ -536,12 +541,13 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
>  #ifndef CONFIG_SLOB
>  		if (!(flags & GFP_DMA)) {
>  			unsigned int index = kmalloc_index(size);
> +			unsigned int recl = kmalloc_reclaimable(flags);

This is a hotpath reserved for regular allocations. The reclaimable slabs
need to be handled like the DMA slabs.  So check for GFP_DMA plus the
reclaimable flags.

> @@ -588,12 +594,13 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
>  	if (__builtin_constant_p(size) &&
>  		size <= KMALLOC_MAX_CACHE_SIZE && !(flags & GFP_DMA)) {
>  		unsigned int i = kmalloc_index(size);
> +		unsigned int recl = kmalloc_reclaimable(flags);
>


Same situation here and additional times below.