Message-ID: <4E0011A0.4070401@redhat.com>
Date: Tue, 21 Jun 2011 11:36:00 +0800
From: Cong Wang <amwang@redhat.com>
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To: Eric B Munson <emunson@mgebm.net>
CC: Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
        linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
        Andrea Arcangeli <aarcange@redhat.com>,
        Johannes Weiner <jweiner@redhat.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, linux-mm@kvack.org
Subject: Re: [PATCH 1/3] mm: completely disable THP by transparent_hugepage=never
References: <1308587683-2555-1-git-send-email-amwang@redhat.com> <20110620165844.GA9396@suse.de> <4DFF7E3B.1040404@redhat.com> <4DFF7F0A.8090604@redhat.com> <4DFF8106.8090702@redhat.com> <4DFF8327.1090203@redhat.com> <4DFF84BB.3050209@redhat.com> <20110620175859.GB9697@mgebm.net>
In-Reply-To: <20110620175859.GB9697@mgebm.net>
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于 2011年06月21日 01:58, Eric B Munson 写道:
> If memory is this scarce, why not set CONFIG_TRANSPARENT_HUGEPAGE=n and be done
> with it?  If the config option is enabled, the admin should be able to turn the
> functionality back on if desired.  If you really don't _ever_ want THP then
> disable the config.
>

Unfortunately, changing .config is not always as easy as you said,
for the kdump case, we use the same kernel binary with the normal kernel
which certainly has to have THP enabled in .config.

Thanks.
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