Re: [PATCH for-v3.7 2/2] slub: optimize kmalloc* inlining for GFP_DMA

From: JoonSoo Kim
Date: Mon Oct 22 2012 - 22:29:35 EST

2012/10/22 Christoph Lameter <cl@xxxxxxxxx>:
> On Sun, 21 Oct 2012, Joonsoo Kim wrote:
>> kmalloc() and kmalloc_node() of the SLUB isn't inlined when @flags = __GFP_DMA.
>> This patch optimize this case,
>> so when @flags = __GFP_DMA, it will be inlined into generic code.
> __GFP_DMA is a rarely used flag for kmalloc allocators and so far it was
> not considered that it is worth to directly support it in the inlining
> code.

Hmm... but, the SLAB already did that optimization for __GFP_DMA.
Almost every kmalloc() is invoked with constant flags value,
so I think that overhead from this patch may be negligible.
With this patch, code size of vmlinux is reduced slightly.
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