From: David Rientjes <rientjes@google.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Michael J Wolf <mjwolf@us.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics
Date: Thu, 3 Feb 2011 13:54:56 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.00.1102031354340.1307@chino.kir.corp.google.com> (raw)
In-Reply-To: <20110201003357.D6F0BE0D@kernel>
On Mon, 31 Jan 2011, Dave Hansen wrote:
> I'm working on some more reports that transparent huge pages and
> KSM do not play nicely together. Basically, whenever THP's are
> present along with KSM, there is a lot of attrition over time,
> and we do not see much overall progress keeping THP's around:
>
> http://sr71.net/~dave/ibm/038_System_Anonymous_Pages.png
>
> (That's Karl Rister's graph, thanks Karl!)
>
> However, I realized that we do not currently have a nice way to
> find out where individual THP's might be on the system. We
> have an overall count, but no way of telling which processes or
> VMAs they might be in.
>
> I started to implement this in the /proc/$pid/smaps code, but
> quickly realized that the lib/pagewalk.c code unconditionally
> splits THPs up. This set reworks that code a bit and, in the
> end, gives you a per-map count of the numbers of huge pages.
> It also makes it possible for page walks to _not_ split THPs.
>
Nice! I'd like to start using this patchset immediately, I'm hoping
you'll re-propose it with the fixes soon.
Thanks Dave.
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prev parent reply other threads:[~2011-02-03 21:55 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-01 0:33 Dave Hansen
2011-02-01 0:33 ` [RFC][PATCH 1/6] count transparent hugepage splits Dave Hansen
2011-02-01 9:58 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-04 21:18 ` Andrea Arcangeli
2011-02-04 21:28 ` Dave Hansen
2011-02-01 0:33 ` [RFC][PATCH 2/6] pagewalk: only split huge pages when necessary Dave Hansen
2011-02-01 10:04 ` Johannes Weiner
2011-02-01 15:03 ` Dave Hansen
2011-02-03 21:22 ` David Rientjes
2011-02-03 21:33 ` Dave Hansen
2011-02-03 21:46 ` David Rientjes
2011-02-04 17:19 ` Dave Hansen
2011-02-04 21:10 ` Andrea Arcangeli
2011-02-01 0:34 ` [RFC][PATCH 3/6] break out smaps_pte_entry() from smaps_pte_range() Dave Hansen
2011-02-01 10:08 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-03 21:40 ` Dave Hansen
2011-02-01 0:34 ` [RFC][PATCH 4/6] pass pte size argument in to smaps_pte_entry() Dave Hansen
2011-02-01 10:09 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-01 0:34 ` [RFC][PATCH 5/6] teach smaps_pte_range() about THP pmds Dave Hansen
2011-02-01 10:11 ` Johannes Weiner
2011-02-01 15:02 ` Dave Hansen
2011-02-01 16:09 ` Andrea Arcangeli
2011-02-03 21:22 ` David Rientjes
2011-02-03 21:34 ` Dave Hansen
2011-02-01 0:34 ` [RFC][PATCH 6/6] have smaps show transparent huge pages Dave Hansen
2011-02-01 10:12 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-01 15:38 ` [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics Andrea Arcangeli
2011-02-01 17:15 ` Dave Hansen
2011-02-01 20:39 ` Andrea Arcangeli
2011-02-01 20:56 ` Dave Hansen
2011-02-02 0:07 ` Andrea Arcangeli
2011-02-08 17:54 ` Dave Hansen
2011-02-08 18:17 ` Andrea Arcangeli
2011-02-03 21:54 ` David Rientjes [this message]
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