Re: [RFC] madvise(MADV_TRUNCATE)

[Badari Pulavarty <pbadari@us.ibm.com>]

Jeff Dike wrote:

> On Fri, Oct 28, 2005 at 09:19:14AM -0700, Badari Pulavarty wrote:
> 
>>My touch tests so far, doesn't really verify data after freeing. I was
>>thinking about writing cases. If I can use UML to do it, please send it
>>to me. I would rather test with real world case :)
> 
> 
> Grab and unpack http://www.user-mode-linux.org/~jdike/truncate.tar.bz2
> 
> That will give you a "linux" directory.
> 
> Make sure that your /tmp is tmpfs with > 192M of space.
> 
> Run UML - from above the linux directory, this would be something like
> 	linux/2.6/linux-2.6.14-rc5/obj/linux con0=fd:0,fd:1 con1=none con=pts ssl=pts umid=debian mem=192M ubda=linux/debian_22 devfs=nomount
> 
> Log in, the root password is "root".
> 
> Unplug some memory -
> 	linux/uml_mconsole debian config mem=-10M
> 
> Go back to the UML and try do to something - ps, ls, anything.
> 
> It will be hung on handling an infinite page fault loop due to a whole lot
> of pages having been zeroed all of a sudden.
> 
> This will happen even when you unplug 2 pages (mem=-8K).  Only one of them
> will be madvised because the other is used to keep track of the madvised
> pages.
> 
> I also included my patchset in there (linux/2.6/linux-2.6.14-rc5/patches) if
> you want to build UML from source.  Due to my not refreshing the hotplug 
> patch before making the tarball, it's not there.  So, I've attached it.
> 

Thank you. Its going to be Monday before I get to it.
I will let you know.

Thanks,
Badari

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