Messages in this thread | | | Subject | Re: [RFC 2/3] mm: Add a new page flag PageLayzyFree() for MADV_FREE | From | Mika Penttilä <> | Date | Sun, 15 Mar 2020 10:54:03 +0200 |
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On 15.3.2020 10.18, Wei Yang wrote: > On Fri, Feb 28, 2020 at 11:38:18AM +0800, Huang, Ying wrote: >> From: Huang Ying <ying.huang@intel.com> >> >> Now !PageSwapBacked() is used as the flag for the pages freed lazily >> via MADV_FREE. This isn't obvious enough. So Dave suggested to add a >> new page flag for that to improve the code readability. > I am confused with the usage of PageSwapBacked(). > > Previously I thought this flag means the page is swapin, set in > swapin_readahead(). While I found page_add_new_anon_rmap() would set it too. > This means every anon page would carry this flag. Then what is this flag > means? > >
But not all PageSwapBacked() pages are anon, like shmem.
--Mika
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