From: Cong Wang <amwang@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Mel Gorman <mgorman@suse.de>,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
Andrea Arcangeli <aarcange@redhat.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm@kvack.org
Subject: Re: [PATCH 2/3] mm: make the threshold of enabling THP configurable
Date: Wed, 22 Jun 2011 18:46:39 +0800 [thread overview]
Message-ID: <4E01C80F.8070605@redhat.com> (raw)
In-Reply-To: <20110622091611.GB7585@csn.ul.ie>
于 2011年06月22日 17:16, Mel Gorman 写道:
>
> What I meant was that there is a rational reason why 512M is the
> default for enabling THP by default. Tuning it lower than that by any
> means makes very little sense. Tuning it higher might make some sense
> but it is more likely that THP would simply be disabled via sysctl. I
> see very little advantage to introducing this Kconfig option other
> than as a source of confusion when running make oldconfig.
>
The tunable range is (512, 8192), so 512M is the minimum.
Sure, I knew it can be disabled via /sys, actually we can do even
more in user-space, that is totally move the 512M check out of kernel,
why we didn't?
In short, I think we should either remove the 512M from kernel, or
make 512M to be tunable.
Thanks.
next prev parent reply other threads:[~2011-06-22 10:47 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 [this message]
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
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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