Re: mmap() > phys mem problem

[Ron Maeder <rlm@orionmulti.com>]

Thanks very much for your response.  I have had some help trying out the 
patch and running recent versions of the kernel.  The problem is not fixed 
in 2.6.6+patch or in 2.6.7-rc2.  Any other suggestions?

Ron

On Sun, 30 May 2004, Nick Piggin wrote:

> Ron Maeder wrote:
>> On Fri, 28 May 2004, Rik van Riel wrote:
>> 
>>> On Tue, 25 May 2004, Ron Maeder wrote:
>>> 
>>>> Is this an "undocumented feature" or is this a linux error?  I would
>>>> expect pages of the mmap()'d file would get paged back to the original
>>>> file. I know this won't be fast, but the performance is not an issue 
>>>> for
>>>> this application.
>>> 
>>> 
>>> It looks like a kernel bug.  Can you reproduce this problem
>>> with the latest 2.6 kernel or is it still there ?
>>> 
>>> Rik
>> 
>> 
>> I was able to reproduce the problem with the code that I posted on a 2.6.6
>> kernel.
>> 
>
> Can you give this NFS patch (from Trond) a try please?
>
> (I don't think it is a very good idea for NFS to be using
> WRITEPAGE_ACTIVATE here. If NFS needs to have good write
> clustering off the end of the LRU, we need to go about it
> some other way.)
>
>
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