From: David Howells <dhowells@redhat.com>
To: linux-mm@kvack.org
Cc: dhowells@redhat.com
Subject: A question about alloc_pages()
Date: Thu, 25 Sep 2008 23:31:16 +0100 [thread overview]
Message-ID: <15178.1222381876@redhat.com> (raw)
Hi,
When alloc_pages() is asked to allocate a block of pages (order > 0), should I
be able to expect that page_count(pages[0]) will be 1, and page_count() for
all the other pages will be 0?
As far as I can see, nothing in the allocator alters what's in the page count
for pages beyond the first when pages are freed, and checks are made that
these are 0 upon freeing, so it looks to me like this ought to be the case.
However, I have a report that sometimes this isn't true, and I'm wondering if
the allocator can't be relied on in this way, or whether there's a bug
somewhere keeping a reference to a released page.
David
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next reply other threads:[~2008-09-25 22:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-25 22:31 David Howells [this message]
2008-09-26 16:01 ` Christoph Lameter
2008-09-29 13:21 ` David Howells
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