From: Alok Mooley <rangdi@yahoo.com>
To: linux-mm@kvack.org
Subject: Anomaly in Buddy bitmaps?
Date: Tue, 20 Jan 2004 11:57:29 -0800 (PST) [thread overview]
Message-ID: <20040120195729.90088.qmail@web9706.mail.yahoo.com> (raw)
I wrote a module in kernel 2.6.0 for scanning a higher
order block from zone_mem_map for ZONE_NORMAL &
checking the buddy bitmaps for the same.
In the case of order 4, while scanning on the
order 4 block boundaries, I found an order 4 block
with page state 0000000001111111,where 0s represent
free pages & 1s represent order 0 allocations. The bit
in the order 3 bitmap corresponding to this 4th order
block was found to be a 0,whereas this bit should have
been a 1 as one 3rd order buddy is completely free.
I got the same result (a 0, where a 1 should have been
found) in another case too.
Is this an anomaly in the buddy bitmaps? Can the buddy
bitmaps ever be inconsistent?
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next reply other threads:[~2004-01-20 19:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-20 19:57 Alok Mooley [this message]
2004-01-20 20:09 ` William Lee Irwin III
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