| To: | Jun Sun <jsun@mvista.com> |
|---|---|
| Subject: | Re: [pathch] kernel/sched.c bogon? |
| From: | Ralf Baechle <ralf@linux-mips.org> |
| Date: | Mon, 10 Mar 2003 13:55:31 +0100 |
| Cc: | Kip Walker <kwalker@broadcom.com>, linux-mips@linux-mips.org |
| In-reply-to: | <20030306174001.K26071@mvista.com>; from jsun@mvista.com on Thu, Mar 06, 2003 at 05:40:01PM -0800 |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <3E67EF64.152CFC6C@broadcom.com> <20030306174001.K26071@mvista.com> |
| Sender: | linux-mips-bounce@linux-mips.org |
| User-agent: | Mutt/1.2.5.1i |
On Thu, Mar 06, 2003 at 05:40:01PM -0800, Jun Sun wrote: > I reported this bug last May. Apparently it is still not > taken up-stream. Ralf, why don't we fix it here and push > it up from you? > > BTW, this bug actually has effect on real-time performance under > preemptible kernel. < = 2.4.x preemptible kernel is OPP. > It can delay the execution of the highest > priority real-time process from execution up to 1 jiffy. Quite a number of users get_cycles() in the kernel assume it to return a 64-bit number. I guess we'll have to fake a 64-bit counter in software ... Ralf |
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