lkml.org 
[lkml]   [2012]   [Oct]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH for-v3.7 2/2] slub: optimize kmalloc* inlining for GFP_DMA
From
2012/10/22 Christoph Lameter <cl@linux.com>:
> 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.


\
 
 \ /
  Last update: 2012-10-23 05:21    [W:0.059 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site