From: Eliezer Tamir <eliezer.tamir@linux.intel.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Don Skidmore <donald.c.skidmore@intel.com>,
e1000-devel@lists.sourceforge.net,
Willem de Bruijn <willemb@google.com>,
Ben Hutchings <bhutchings@solarflare.com>,
Andi Kleen <andi@firstfloor.org>, HPA <hpa@zytor.com>,
Eilon Greenstien <eilong@broadcom.com>,
Or Gerlitz <or.gerlitz@gmail.com>,
Amir Vadai <amirv@mellanox.com>,
Alex Rosenbaum <alexr@mellanox.com>,
Avner Ben Hanoch <avnerb@mellanox.com>,
Or Kehati <ork@mellanox.com>,
sockperf-dev@googlegroups.com,
Eliezer Tamir <eliezer@tamir.org.il>
Subject: Re: [PATCH v2 net-next] net: poll/select low latency socket support
Date: Tue, 18 Jun 2013 16:25:21 +0300 [thread overview]
Message-ID: <51C05FC1.4000201@linux.intel.com> (raw)
In-Reply-To: <1371551139.3252.249.camel@edumazet-glaptop>
On 18/06/2013 13:25, Eric Dumazet wrote:
> On Tue, 2013-06-18 at 11:58 +0300, Eliezer Tamir wrote:
>> @@ -731,7 +755,11 @@ static inline unsigned int do_pollfd(struct pollfd *pollfd, poll_table *pwait)
>> mask = DEFAULT_POLLMASK;
>> if (f.file->f_op && f.file->f_op->poll) {
>> pwait->_key = pollfd->events|POLLERR|POLLHUP;
>> + if (try_ll)
>> + pwait->_key |= POLL_LL;
>
> Well, why enforce POLL_LL ?
>
> Sure we do this for select() as the API doesn't allow us to add the LL
> flag, but poll() can do that.
>
> An application might set POLL_LL flag only on selected fds.
One other thing,
sock_poll() will only ll_poll if the flag was set _and_ the socket has a
none-zero value in sk->sk_ll_usec so you still only poll on sockets
that were enabled for LLS, not on every socket.
-Eliezer
next prev parent reply other threads:[~2013-06-18 13:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-18 8:57 [PATCH v2 net-next 0/1] net: lls select poll support Eliezer Tamir
2013-06-18 8:58 ` [PATCH v2 net-next] net: poll/select low latency socket support Eliezer Tamir
2013-06-18 9:08 ` Eric Dumazet
2013-06-18 9:12 ` Eliezer Tamir
2013-06-18 10:25 ` Eric Dumazet
2013-06-18 10:37 ` Eliezer Tamir
2013-06-18 13:25 ` Eliezer Tamir [this message]
2013-06-18 14:35 ` Eric Dumazet
2013-06-18 14:45 ` Eliezer Tamir
2013-06-18 14:50 ` Eliezer Tamir
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