Re: [PATCH] mm: Check if any page in a pageblock is reserved before marking it MIGRATE_RESERVE

From: Minchan Kim
Date: Tue Apr 06 2010 - 00:15:21 EST

On Tue, Apr 6, 2010 at 12:09 PM, Arve HjÃnnevÃg <arve@xxxxxxxxxxx> wrote:
> This fixes a problem where the first pageblock got marked MIGRATE_RESERVE even
> though it only had a few free pages. This in turn caused no contiguous memory
> to be reserved and frequent kswapd wakeups that emptied the caches to get more
> contiguous memory.

It would be better to add following your description of previous mail thread.
It can help others understand it in future.

On Fri, Apr 02, 2010 at 05:59:00PM -0700, Arve Hj?nnev?g wrote:
"I think this happens by default on arm. The kernel starts at offset
0x8000 to leave room for boot parameters, and in recent kernel
versions (>~2.6.26-29) this memory is freed."

Kind regards,
Minchan Kim
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