From: Michel Lespinasse <walken@google.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: THP, rmap and page_referenced_one()
Date: Mon, 7 Mar 2011 02:35:15 -0800 [thread overview]
Message-ID: <AANLkTikKtxEoXT=Y9d80oYnY7LvfLn8Hwz-XorSxR3Mv@mail.gmail.com> (raw)
In-Reply-To: <AANLkTinncv11r3cJnOr0HWZyaSu5NQMz6pEYThMkmFd0@mail.gmail.com>
There is also the issue that *mapcount will be decremented even if the
pmd turns out not to point to the given page. page_referenced() will
stop looking at rmap's candidate mappings once the refcount hits zero,
so the decrement will cause an actual mapping to be ignored.
--
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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next prev parent reply other threads:[~2011-03-07 10:35 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-07 6:50 Michel Lespinasse
2011-03-07 7:33 ` KOSAKI Motohiro
2011-03-07 8:35 ` Minchan Kim
2011-03-07 10:35 ` Michel Lespinasse [this message]
2011-03-08 11:32 ` Andrea Arcangeli
2011-03-08 12:21 ` Michel Lespinasse
2011-03-08 12:58 ` Andrea Arcangeli
2011-03-08 22:48 ` Minchan Kim
2011-03-09 9:18 ` Johannes Weiner
2011-03-08 13:57 ` Rik van Riel
2011-03-09 7:11 ` KOSAKI Motohiro
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