linux-kernel - Re: [RFC PATCH v1 08/15] mm/sl[auo]b: cleanup kmalloc()

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Date:   Fri, 22 Apr 2022 21:46:09 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     linux-mm@...ck.org, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 08/15] mm/sl[auo]b: cleanup kmalloc()

On Thu, Mar 24, 2022 at 06:46:34PM +0100, Vlastimil Babka wrote:
> On 3/8/22 12:41, Hyeonggon Yoo wrote:
> > Now that kmalloc() and kmalloc_node() do same job, make kmalloc()
> > wrapper of kmalloc_node().
> > 
> > Remove kmalloc_trace() that is now unused. This patch makes slab
> > allocator use kmalloc_node tracepoints in kmalloc().
> > 
> > Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
> 
> Actually there are more things to fix than the commit log.
> 
> > +#ifndef CONFIG_SLOB
> > +static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
> > +{
> > +	if (__builtin_constant_p(size)) {
> > +		unsigned int index;
> > +
> > +		if (size > KMALLOC_MAX_CACHE_SIZE)
> > +			return kmalloc_large(size, flags);
> 
> Should use kmalloc_large_node().
> 
> > +
> > +		index = kmalloc_index(size);
> > +
> > +		if (!index)
> > +			return ZERO_SIZE_PTR;
> > +
> > +		return kmem_cache_alloc_node_trace(
> > +				kmalloc_caches[kmalloc_type(flags)][index],
> > +						flags, node, size);
> > +	}
> > +	return __kmalloc_node(size, flags, node);
> > +}
> > +#else
> > +static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
> > +{
> > +	if (__builtin_constant_p(size) && size > KMALLOC_MAX_CACHE_SIZE)
> > +		return kmalloc_large(size, flags);
> 
> And here.
> 

Sorry for the mistake. did it in v2. thanks!

> > +
> > +	return __kmalloc_node(size, flags, node);
> > +}
> > +#endif

-- 
Thanks,
Hyeonggon