Subject: Re: [PATCH v4 net-next] net: poll/select low latency socket support

From: Andi Kleen <[email-masked]>
Date: Fri, 28 Jun 2013 06:43:05 +0200

> @@ -400,6 +402,8 @@ int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
>  	poll_table *wait;
>  	int retval, i, timed_out = 0;
>  	unsigned long slack = 0;
> +	unsigned int ll_flag = POLL_LL;
> +	u64 ll_time = ll_end_time();

So you're adding a sched_clock to every select call, even if it has
nothing to do with ll? 

That seems rather drastic. select can be performance critical.

-andi

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