17993ced1b
clearing the page's PGA_REFERENCED flag. Since we are typically manipulating the page's act_count field when we are clearing its PGA_REFERENCED flag, the page lock is already held everywhere that we clear the PGA_REFERENCED flag. So, in fact, this revision only changes some comments and an assertion. Nonetheless, it will enable later changes to object locking in the pageout code. Introduce vm_page_assert_locked(), which completely hides the implementation details of the page lock from the caller, and use it in vm_page_aflag_clear(). (The existing vm_page_lock_assert() could not be used in vm_page_aflag_clear().) Over the coming weeks, I expect that we'll either eliminate or replace the various uses of vm_page_lock_assert() with vm_page_assert_locked(). Reviewed by: attilio Sponsored by: EMC / Isilon Storage Division
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