From: Cong Wang <amwang@redhat.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
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 11:15:01 +0800 [thread overview]
Message-ID: <4E000CB5.3050201@redhat.com> (raw)
In-Reply-To: <20110620194321.GI20843@redhat.com>
于 2011年06月21日 03:43, Andrea Arcangeli 写道:
> On Tue, Jun 21, 2011 at 01:01:17AM +0800, Cong Wang wrote:
>> Without this patch, THP is still initialized (although khugepaged is not started),
>> that is what I don't want to see when I pass "transparent_hugepage=never",
>> because "never" for me means THP is totally unseen, even not initialized.
>
> The ram saving by not registering in sysfs is not worth the loss of
> generic functionality. You can try to make the hash and slab
> khugepaged allocations more dynamic if you want to microoptimize for
> RAM usage, that I wouldn't be against if you find a way to do it
> simply and without much complexity (and .text) added. But likely there
> are other places to optimize that may introduce less tricks and would
> give you a bigger saving than ~8kbytes, it's up to you.
But the THP functionality is not going to be used.
Yeah, sounds reasonable, I will try to check if I can make it.
Thanks for pointing this out!
next prev parent reply other threads:[~2011-06-21 3:15 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 [this message]
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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