On 12/18/2013 11:29 PM, Wanpeng Li wrote:
PageLocked is not required by page_referenced_anon() and there is not
>any assertion before, commit 37f093cdf introduced this extra BUG_ON()
There are two callsites shrink_active_list and page_check_references()
of page_referenced(). shrink_active_list and its callee won't lock anonymous
page, however, page_check_references() is called with anonymous page
lock held in shrink_page_list. So page_check_references case need
specail handling.
This explanation seems to be based on current observed behaviour.
I think it would be easier if you could point out the actual code in each
function that requires a page to be locked, once we have that we don't have
to care about what the callers currently do.
Thanks,
Sasha
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