linux-kernel - why do we call clear_active_flags in shrink_inactive

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Message-ID: <44c63dc40712292332s4a2e7e4aief37a2dbdd03fc21@mail.gmail.com>
Date:	Sun, 30 Dec 2007 16:32:42 +0900
From:	"minchan Kim" <barrioskmc@...il.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org
Subject: why do we call clear_active_flags in shrink_inactive_list ?

In 2.6.23's shrink_inactive_list function, why do we have to call
clear_active_flags after isolate_lru_pages call ?
IMHO, If it call isolate_lru_pages with "zone->inactive_list", It can
be sure that it is not PG_active. So I think It is unnecessary calling
clear_active_flags. Nonetheless, Why do we have to recheck PG_active
flags wich clear_active_flags.

If it is right, which case it happens that page is set to be PG_active ?

-- 
Thanks,
barrios
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