From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: wuzhangjin@gmail.com
Cc: Ingo Molnar <mingo@elte.hu>, Ralf Baechle <ralf@linux-mips.org>,
linux-mips@linux-mips.org, Thomas Gleixner <tglx@linutronix.de>,
Michal Simek <monstr@monstr.eu>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] MIPS: Add a high resolution sched_clock() via cnt32_to_63().
Date: Sun, 22 Nov 2009 14:55:07 +0300 [thread overview]
Message-ID: <4B09269B.8070602@ru.mvista.com> (raw)
In-Reply-To: <1258888086.4548.52.camel@falcon.domain.org>
Hello.
Wu Zhangjin wrote:
>>> +static void __maybe_unused setup_sched_clock_update(unsigned long tclk)
>>> +{
>>> + unsigned long data;
>>> +
>>> + data = (0xffffffffUL / tclk / 2 - 2) * HZ;
>>>
>
> Because the MIPS c0 count's frequency is half of the cpu frequency(Hi, Ralf, does every MIPS c0 count meet this feature?),
No, e.g. Alchemy's C0 Count ticks at full CPU speed.
WBR, Sergei
next prev parent reply other threads:[~2009-11-22 11:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-22 7:44 [PATCH v2] MIPS: Add a high resolution sched_clock() via cnt32_to_63() Wu Zhangjin
2009-11-22 8:13 ` Ingo Molnar
2009-11-22 11:08 ` Wu Zhangjin
2009-11-22 11:55 ` Sergei Shtylyov [this message]
2009-11-22 12:35 ` Ralf Baechle
2009-11-22 13:18 ` Wu Zhangjin
2009-11-22 11:51 ` Sergei Shtylyov
2009-11-22 18:06 ` Ingo Molnar
2009-11-22 20:23 ` Ralf Baechle
2009-11-23 8:42 ` Ingo Molnar
2009-12-02 1:58 ` Maciej W. Rozycki
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