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List:       linux-kernel
Subject:    Re: Slow pty's (was Re: libdivecomputer interfaces?)
From:       Mike Galbraith <efault () gmx ! de>
Date:       2010-06-17 14:14:46
Message-ID: 1276784086.8316.17.camel () marge ! simson ! net
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On Thu, 2010-06-17 at 15:24 +0200, Peter Zijlstra wrote:

> Humm,. the code around there suggests something like the below, but I
> must admit its been a while since I really read all that nohz stuff,
> Thomas, any preferences?

Mine works.  Yours fits and works.  -+ vs ----+, you win :)

 
> ---
>  kernel/time/tick-sched.c |    5 +----
>  1 files changed, 1 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
> index 5f171f0..e0707ea 100644
> --- a/kernel/time/tick-sched.c
> +++ b/kernel/time/tick-sched.c
> @@ -315,9 +315,6 @@ void tick_nohz_stop_sched_tick(int inidle)
>  		goto end;
>  	}
>  
> -	if (nohz_ratelimit(cpu))
> -		goto end;
> -
>  	ts->idle_calls++;
>  	/* Read jiffies and the time when jiffies were updated last */
>  	do {
> @@ -328,7 +325,7 @@ void tick_nohz_stop_sched_tick(int inidle)
>  	} while (read_seqretry(&xtime_lock, seq));
>  
>  	if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu) ||
> -	    arch_needs_cpu(cpu)) {
> +	    arch_needs_cpu(cpu) || nohz_ratelimit(cpu)) {
>  		next_jiffies = last_jiffies + 1;
>  		delta_jiffies = 1;
>  	} else {

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