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SubjectRe: 2.1.103: Got lots of "VM: Found a writable swap-cached page!"
Tom G. Christensen wrote:

> I just got a bunch of "VM: Found a writable swap-cached page!" messages in my
> syslog luckily I had Bill Hawes' diagnostic patch in place.
> Attached is the relevant part of my syslog file (5k gzipped)
>
> When these messages appeared the machine had been up for 1h20m
> I was running X with 4 virtual desks, PPP-link was up, I had Xfmail 1.3,
> 2xwine980601/Agent 1.5, Netscape Navigator 4.04, Xisp and several rxvt's
> running.
> The machine was more sluggish (swapping) than it normally is with this setup
> (which is about the same every evening when I'm on the net)

Hi Tom,

Thanks for helping track this mysterious bug. The log messages confirm that the
writable pages really are in the swap cache; it's not just a matter of the swap
cache flag being set.

I haven't been able to figure out _how_ this can happen, but will do some more
code review and try to spot the problem.With that many pages in the writable-swap
cache state, the swapping process would become a little constipated, so it's not
surprising that your system was behaving poorly.

> If there is anything more I can do to help track down this bug please just say
> so and I will be at your service.

Thanks, I'll work on a patch to do some further diagnosis, and hopefully get this
resolved soon.

Regards,
Bill



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