From: Cong Wang <amwang@redhat.com>
To: Mel Gorman <mgorman@suse.de>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
Andrea Arcangeli <aarcange@redhat.com>,
Rik van Riel <riel@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
Date: Tue, 21 Jun 2011 01:07:07 +0800 [thread overview]
Message-ID: <4DFF7E3B.1040404@redhat.com> (raw)
In-Reply-To: <20110620165844.GA9396@suse.de>
ao? 2011a1'06ae??21ae?JPY 00:58, Mel Gorman a??e??:
> On Tue, Jun 21, 2011 at 12:34:28AM +0800, Amerigo Wang wrote:
>> transparent_hugepage=never should mean to disable THP completely,
>> otherwise we don't have a way to disable THP completely.
>> The design is broken.
>>
>
> I don't get why it's broken. Why would the user be prevented from
> enabling it at runtime?
>
We need to a way to totally disable it, right? Otherwise, when I configure
THP in .config, I always have THP initialized even when I pass "=never".
For me, if you don't provide such way to disable it, it is not flexible.
I meet this problem when I try to disable THP in kdump kernel, there is
no user of THP in kdump kernel, THP is a waste for kdump kernel. This is
why I need to find a way to totally disable it.
Thanks.
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next prev parent reply other threads:[~2011-06-20 17:07 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 16:34 [PATCH 1/3] mm: completely disable THP by transparent_hugepage=never Amerigo Wang
2011-06-20 16:34 ` [PATCH 2/3] mm: make the threshold of enabling THP configurable Amerigo Wang
2011-06-20 16:59 ` Dave Hansen
2011-06-20 17:23 ` Cong Wang
2011-06-20 16:59 ` Mel Gorman
2011-06-20 17:16 ` Cong Wang
2011-06-21 9:36 ` Mel Gorman
2011-06-22 2:41 ` Cong Wang
2011-06-22 9:16 ` Mel Gorman
2011-06-22 10:46 ` Cong Wang
2011-06-22 11:15 ` Mel Gorman
2011-06-22 12:34 ` Cong Wang
2011-06-20 16:34 ` [PATCH 3/3] mm: print information when THP is disabled automatically Amerigo Wang
2011-06-20 16:54 ` Andrea Arcangeli
2011-06-20 17:25 ` Cong Wang
2011-06-20 17:01 ` Mel Gorman
2011-06-20 17:26 ` Cong Wang
2011-06-20 19:37 ` Andrea Arcangeli
2011-06-21 9:40 ` Mel Gorman
2011-06-20 16:50 ` [PATCH 1/3] mm: completely disable THP by transparent_hugepage=never Andrea Arcangeli
2011-06-20 16:55 ` Rik van Riel
2011-06-20 17:01 ` Cong Wang
2011-06-20 19:43 ` Andrea Arcangeli
2011-06-21 3:15 ` Cong Wang
2011-06-20 16:58 ` Mel Gorman
2011-06-20 17:07 ` Cong Wang [this message]
2011-06-20 17:10 ` Rik van Riel
2011-06-20 17:19 ` Cong Wang
2011-06-20 17:28 ` Rik van Riel
2011-06-20 17:34 ` Cong Wang
2011-06-20 17:50 ` Rik van Riel
2011-06-20 18:25 ` Vivek Goyal
2011-06-20 19:21 ` Andrea Arcangeli
2011-06-21 4:08 ` Cong Wang
2011-06-21 14:43 ` Andrea Arcangeli
2011-06-22 2:56 ` Cong Wang
2011-06-22 14:22 ` Andrea Arcangeli
2011-06-21 20:01 ` Rik van Riel
2011-06-21 3:28 ` Cong Wang
2011-06-20 17:58 ` Eric B Munson
2011-06-21 3:36 ` Cong Wang
2011-06-20 17:59 ` Vivek Goyal
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