Messages in this thread | | | Subject | Re: 2.6.14-rc4-rt7 | From | Daniel Walker <> | Date | Tue, 18 Oct 2005 09:23:30 -0700 |
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On Tue, 2005-10-18 at 08:42 +0200, Ingo Molnar wrote: > * Daniel Walker <dwalker@mvista.com> wrote: > > > I found this latency ~5 minutes after boot up, no load . It looks like > > vgacon_scroll() has a memset like operation which can grow. > > do you have PRINTK_IGNORE_LOGLEVEL enabled? If yes then much of the > printk code will run with interrupts disabled - hence non-preemptable. > PRINTK_IGNORE_LOGLEVEL is a debugging feature for developers. I have > added an extra explanation to the Kconfig, see below.
I was just running a "make defconfig" and I enabled latency tracing . PRINTK_IGNORE_LOGLEVEL defaults to off (doesn't it?), and I didn't make any changes to it . Unless it get switched on by something else ..
It looks like the logic might be reversed in release_console_sem() .
Daniel
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