Date: Sun, 19 Sep 2004 22:48:41 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Karsten Wiese <annabellesgarden@yahoo.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch] voluntary-preempt-2.6.9-rc2-mm1-S1
Message-ID: <20040919204841.GA7004@elte.hu>
References: <200409192232.20139.annabellesgarden@yahoo.de>
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* Karsten Wiese <annabellesgarden@yahoo.de> wrote:

> Just 1 small correction:
> >>>>
> --- kernel/time.c~      2004-09-19 15:09:38.000000000 +0200
> +++ kernel/time.c       2004-09-19 17:02:35.000000000 +0200
> @@ -96,8 +96,10 @@
>  asmlinkage long sys_gettimeofday(struct timeval __user *tv, struct timezone 
> __user *tz)
>  {
>  #ifdef CONFIG_LATENCY_TRACE
> -       if (!tv && ((long)tz == 1))
> +       if (!tv && ((long)tz == 1)) {
>                 user_trace_start();
> +               tz = NULL;
> +       }
>         if (!tv && !tz)
>                 user_trace_stop();

The point is to let gettimeofday(0,1) start tracing and
gettimeofday(0,0) stop tracing - a system-call-controlled tracing
facility (if trace_enabled=2). This was used to trace weird latencies
before, but it's not the normal mode of operation.

	Ingo
-
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