Re: [axfs-developer] Mounting profiled axfs

[Andre P. <and...@im...>]

Hi Will,

thanks for figuring that out! I tried to apply the changes that you made 
on my 2.6.21 kernel. Despite a few changes I had to make the kernel 
doesn't allow to start any application. After mounting the image (which 
works) there is no other output. So I guess init is not running properly.
But I have to admit that I applied the patches by hand with the help of 
the websvn interface as I can't use normal svn through our firewall. 
Maybe I overlooked something here. At least I encountered these problems:
- vm_insert_mixed() is only available in kernel around 2.6.25/26 not 
2.6.17 (see axfs_inode.c)
- when compiled with mtd support axfs_get_io_dev_size() is not 
available, the prototype is defined but not more

Would be nice to have some benchmarks of axfs without profiling as 
cramfs (+linear patch) is still a bit faster, at least in my environment.

Best regards,
Andre




Will Marone wrote:
> Andre,
>
> We took a closer look at the bug you were encountering, and did a 
> little more indepth testing and managed to produce a bug in XIP 
> execution in our own filesystem images similar to what you described 
> that caused failures when executing using a profiled filesystem 
> generated by mkfs.axfs.
>
> This bug cropped up in 2.6.25 and prior, back to at least 2.6.18 but 
> wasn't present in 2.6.26 and onward. We made some changes which are 
> now up on sourceforge.
>
> We ran our tests against the new image both before and after the 
> changes, and the crash was resolved.
>
> Let me know how these changes work for you, as I suspect your problem 
> is related to (or the same as) one we were informed of on 2.6.18.
>
> Will Marone