Page faults

["Paddie O'Brien" <paddieobrien at gmail dot com>]

Hi,

I run the attached to print out the offsets of faulting pages. Both
probes should (I think) print the same number but instead I get this:

hello: filemap_fault
Page: 1678263179
hello: find_get_page
Page: 15

hello: filemap_fault
Page: 1678263179
hello: find_get_page
Page: 1

hello: filemap_fault
Page: 1678263179
hello: find_get_page
Page: 10

etc. etc.

Both functions are from mm/filemap.c. filemap_fault does this:

pgoff_t offset = vmf->offset;
find_get_page(mapping, offset);

Basically, printing the offset in find_get_page works but printing
vmf->offset in filemap_fault doesn't.

Why?

Thanks,
P

Attachment: pages.stp
Description: Binary data