netdev - Re: [PATCH net-next] net: use bigger pages in __netdev_alloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 26 Sep 2012 18:14:45 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: use bigger pages in __netdev_alloc_frag

On Wed, 2012-09-26 at 09:00 -0700, Alexander Duyck wrote:

> One minor thought.  Instead of tracking offset and size why not just
> work from the top down instead of the bottom up?
> 
> So instead of starting with the frag offset at 0, why not start it at
> PAGE_SIZE << order, and then work your way down to 0.  That way you
> don't need to track both size and offset.
> 

How do you refill then ? 

(ie setting xxx->offset back to PAGE_SIZE << order)

I am not sure we have direct access to a page order given a struct page
pointer.

I also like struct page_frag abstraction, because it might allow us
better code factorization with other frag allocators.

( skb_append_datato_frags(), sk_page_frag_refill(), ...)




--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html