Re: [Crash-utility] makedumpfile: 4.5 kernel commit breaks page filtering

Hello Dave, >> Note that PAGE_MAPPING_ANON is now only set in the compound_head page, >> so when makedumpfile walks though the pages, it will have to look >> at each page's head page for the bit setting. > > Thanks for your report. > As you said, it seems checking the head page like kernel does is necessary. > I'll try to work it out, please give me some time. Reading head page's page->mapping for each tail page will take extra time, so I contrived another way. It's just skipping compound tail pages for filtering. If makedumpfile excludes compound pages, it will be done at a time by exclude_range() at the time of checking the compound head page. We don't need to check compound tail pages individually. I made the patch, could you test the *compound* branch below ? This version requires a new unexported symbol, you need to specify -x vmlinux for now. https://sourceforge.net/p/makedumpfile/code/ci/compound/tree/