Re: [Linux-ia64] Re: prctl patch for fpu faults

n0ano
2001-10-10T14:18:00Z

It depends upon the frequency that the FPSWA and unaligned faults
occur. My experience is that, if you get any of these messages, you
get a lot o f them. I like the 4 options David proposes, this
gives you the flexibility to manage these events in any way you
wish. I like to run with the default (rate limited messages) setting -
if any messages come out I know there is something that needs to
be looked at but the system's `printk' buffer doesn't get flooded
with duplicated messages.

On Tue, Oct 09, 2001 at 02:40:49PM -0700, Jesse Barnes wrote:
> What if I were to get rid of the rate limited logging for both the
> unaligned and fpswa handlers? Then there could just be a NOPRINT option
> and a signal option for each; the default behavior would be to log all
> messages. If you'd rather not get rid of it, then I'll just send a patch
> to enable NOPRINT for fpswa (similar to what the unaligned handler does
> now) and a signal option.
>
> Does anyone else have an opinion on the rate limited logging for the
> unaligned and fpswa handlers? Some people have told me that they don't
> think it's useful for admins or users to have some of the messages but not
> all of them.
>
> Thanks,
> Jesse
>
> On Tue, 9 Oct 2001, David Mosberger wrote:
>
> > >>>>> On Tue, 9 Oct 2001 10:38:57 -0700, Jesse Barnes <jbarnes@sgi.com> said:
> >
> > Jesse> Wouldn't that mean you could only do one at a time,
> > Jesse> i.e. you'd be stuck with the rate limiting code even if you
> > Jesse> just wanted a signal, since there'd be no way to say NOPRINT
> > Jesse> | SIGFPE? I'm really just trying to fill the needs of our
> > Jesse> application programmers, who say they want to get all the
> > Jesse> messages and/or get a signal.
> >
> > No, I don't think so:
> >
> > DEFAULT: log message (with rate limit)
> > NOPRINT: be quiet about fixups (not rate limited)
> > SIGNAL: send signal (not rate limited)
> > PRINTALL: log message (not rate limited)
> >
> > In other words, the rate-limiting only applies for the DEFAULT setting.
> >
> > --david
> >
>
>
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Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
n0ano@indstorage.com
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