[Bug runtime/29765] Convert NFS from readpages to readahead => tapset/linux/nfs.stp breakage

[mcermak at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29765

--- Comment #1 from Martin Cermak <mcermak at redhat dot com> ---
Created attachment 14885
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14885&action=edit
new tapset probe nfs.aop.readfolio

Additional possibly interesting kernel commit:
65d023af7f29eb1250a6105141a74776bae7e1f8

When filing this PR, I thought that existing probe nfs.aop.readpage(s)
should be taught to also work with function ("nfs_read_folio").

But since a page can only be identified within a folio in case
the page number is known (*) ITSM the tapset should simply
keep probe nfs.aop.readpage(s) untouched, and provide brand new
probe nfs.aop.readfolio.

Attached trivial version of probe nfs.aop.readfolio.

-------
*
https://elixir.bootlin.com/linux/latest/source/include/linux/page-flags.h#L282

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