netdev - Re: alloc_skb from huge memory

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Message-ID: <1395378886.9114.124.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 20 Mar 2014 22:14:46 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	ratheesh kannoth <ratheesh.ksz@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: alloc_skb from huge memory

On Fri, 2014-03-21 at 10:21 +0530, ratheesh kannoth wrote:
> alloc_skb  does allocation from slub.   memory  slab could be
> kmalloc_1024 or kmalloc_512  (  And there is no  skb slab. i could not
> find in  /proc/slabinfo ).
> 
> Is there any way  to allocate  skb from huge memory or    pre allocated pages ?

What would be the usage ?

In the kernel, almost all memory is mapped to huge pages anyway.

$ tail -3 /proc/meminfo 
DirectMap4k:        4096 kB
DirectMap2M:     2084864 kB
DirectMap1G:    266338304 kB



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