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@xxxxxxxxx>
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
