netdev - Re: [PATCH v9 net-next 5/7] net: simple poll/select low latency socket poll

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Message-ID: <1370441849.24311.256.camel@edumazet-glaptop>
Date:	Wed, 05 Jun 2013 07:17:29 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Willem de Bruijn <willemb@...gle.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Andi Kleen <andi@...stfloor.org>, HPA <hpa@...or.com>,
	Eilon Greenstien <eilong@...adcom.com>,
	Or Gerlitz <or.gerlitz@...il.com>,
	Amir Vadai <amirv@...lanox.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH v9 net-next 5/7] net: simple poll/select low latency
 socket poll

On Wed, 2013-06-05 at 06:56 -0700, Eric Dumazet wrote:

> This looks quite easy, by adding in include/uapi/asm-generic/poll.h
> 
> #define POLL_LL 0x8000
> 
> And do the sk_poll_ll() call only if flag is set.
> 
> I do not think we have to support select(), as its legacy interface, and
> people wanting ll should really use epoll() or poll().

Alternatively, add a per socket flag to enable/disable ll

This global enable assumes the application owns the host anyway.



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