From: Avi Kivity <avi@redhat.com>
To: Robin Holt <holt@sgi.com>
Cc: linuxppc-dev@ozlabs.org, Greg KH <greg@kroah.com>,
linux-kernel@vger.kernel.org,
Dave Hansen <dave@linux.vnet.ibm.com>,
linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 0/8] v2 De-Couple sysfs memory directories from memory sections
Date: Tue, 28 Sep 2010 18:34:14 +0200 [thread overview]
Message-ID: <4CA21906.1080002@redhat.com> (raw)
In-Reply-To: <20100928151218.GJ14068@sgi.com>
On 09/28/2010 05:12 PM, Robin Holt wrote:
> > Why not update sysfs directory creation to be fast, for example by
> > using an rbtree instead of a linked list. This fixes an
> > implementation problem in the kernel instead of working around it
> > and creating a new ABI.
>
> Because the old ABI creates 129,000+ entries inside
> /sys/devices/system/memory with their associated links from
> /sys/devices/system/node/node*/ back to those directory entries.
>
> Thankfully things like rpm, hald, and other miscellaneous commands scan
> that information. On our 8 TB test machine, hald runs continuously
> following boot for nearly an hour mostly scanning useless information
> from /sys/
I see - so the problem wasn't just kernel internal; the ABI itself was
unsuitable. Too bad this wasn't considered at the time it was added.
(129k entries / 1 hour = 35 entries/sec; not very impressive)
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Robin Holt <holt@sgi.com>
Cc: Nathan Fontenot <nfont@austin.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linuxppc-dev@ozlabs.org, Greg KH <greg@kroah.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 0/8] v2 De-Couple sysfs memory directories from memory sections
Date: Tue, 28 Sep 2010 18:34:14 +0200 [thread overview]
Message-ID: <4CA21906.1080002@redhat.com> (raw)
In-Reply-To: <20100928151218.GJ14068@sgi.com>
On 09/28/2010 05:12 PM, Robin Holt wrote:
> > Why not update sysfs directory creation to be fast, for example by
> > using an rbtree instead of a linked list. This fixes an
> > implementation problem in the kernel instead of working around it
> > and creating a new ABI.
>
> Because the old ABI creates 129,000+ entries inside
> /sys/devices/system/memory with their associated links from
> /sys/devices/system/node/node*/ back to those directory entries.
>
> Thankfully things like rpm, hald, and other miscellaneous commands scan
> that information. On our 8 TB test machine, hald runs continuously
> following boot for nearly an hour mostly scanning useless information
> from /sys/
I see - so the problem wasn't just kernel internal; the ABI itself was
unsuitable. Too bad this wasn't considered at the time it was added.
(129k entries / 1 hour = 35 entries/sec; not very impressive)
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Robin Holt <holt@sgi.com>
Cc: Nathan Fontenot <nfont@austin.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linuxppc-dev@ozlabs.org, Greg KH <greg@kroah.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 0/8] v2 De-Couple sysfs memory directories from memory sections
Date: Tue, 28 Sep 2010 18:34:14 +0200 [thread overview]
Message-ID: <4CA21906.1080002@redhat.com> (raw)
In-Reply-To: <20100928151218.GJ14068@sgi.com>
On 09/28/2010 05:12 PM, Robin Holt wrote:
> > Why not update sysfs directory creation to be fast, for example by
> > using an rbtree instead of a linked list. This fixes an
> > implementation problem in the kernel instead of working around it
> > and creating a new ABI.
>
> Because the old ABI creates 129,000+ entries inside
> /sys/devices/system/memory with their associated links from
> /sys/devices/system/node/node*/ back to those directory entries.
>
> Thankfully things like rpm, hald, and other miscellaneous commands scan
> that information. On our 8 TB test machine, hald runs continuously
> following boot for nearly an hour mostly scanning useless information
> from /sys/
I see - so the problem wasn't just kernel internal; the ABI itself was
unsuitable. Too bad this wasn't considered at the time it was added.
(129k entries / 1 hour = 35 entries/sec; not very impressive)
--
error compiling committee.c: too many arguments to function
--
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next prev parent reply other threads:[~2010-09-28 16:35 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-27 19:09 [PATCH 0/8] v2 De-Couple sysfs memory directories from memory sections Nathan Fontenot
2010-09-27 19:09 ` Nathan Fontenot
2010-09-27 19:09 ` Nathan Fontenot
2010-09-27 19:21 ` [PATCH 1/8] v2 Move find_memory_block() routine Nathan Fontenot
2010-09-27 19:21 ` Nathan Fontenot
2010-09-27 19:21 ` Nathan Fontenot
2010-09-27 19:22 ` [PATCH 2/8] v2 Add section count to memory_block struct Nathan Fontenot
2010-09-27 19:22 ` Nathan Fontenot
2010-09-27 19:22 ` Nathan Fontenot
2010-09-28 9:31 ` Robin Holt
2010-09-28 9:31 ` Robin Holt
2010-09-28 9:31 ` Robin Holt
2010-09-28 18:14 ` Nathan Fontenot
2010-09-28 18:14 ` Nathan Fontenot
2010-09-28 18:14 ` Nathan Fontenot
2010-09-27 19:23 ` [PATCH 3/8] v2 Add mutex for adding/removing memory blocks Nathan Fontenot
2010-09-27 19:23 ` Nathan Fontenot
2010-09-27 19:23 ` Nathan Fontenot
2010-09-27 19:25 ` [PATCH 4/8] v2 Allow memory block to span multiple memory sections Nathan Fontenot
2010-09-27 19:25 ` Nathan Fontenot
2010-09-27 19:25 ` Nathan Fontenot
2010-09-27 23:55 ` Dave Hansen
2010-09-27 23:55 ` Dave Hansen
2010-09-27 23:55 ` Dave Hansen
2010-09-28 18:06 ` Nathan Fontenot
2010-09-28 18:06 ` Nathan Fontenot
2010-09-28 18:06 ` Nathan Fontenot
2010-09-28 12:48 ` Robin Holt
2010-09-28 12:48 ` Robin Holt
2010-09-28 12:48 ` Robin Holt
2010-09-28 18:20 ` Nathan Fontenot
2010-09-28 18:20 ` Nathan Fontenot
2010-09-28 18:20 ` Nathan Fontenot
2010-09-27 19:26 ` [PATCH 5/8] v2 Add end_phys_index file Nathan Fontenot
2010-09-27 19:26 ` Nathan Fontenot
2010-09-27 19:26 ` Nathan Fontenot
2010-09-27 19:27 ` [PATCH 6/8] v2 Update node sysfs code Nathan Fontenot
2010-09-27 19:27 ` Nathan Fontenot
2010-09-27 19:27 ` Nathan Fontenot
2010-09-28 9:29 ` Robin Holt
2010-09-28 9:29 ` Robin Holt
2010-09-28 9:29 ` Robin Holt
2010-09-28 15:21 ` Dave Hansen
2010-09-28 15:21 ` Dave Hansen
2010-09-28 15:21 ` Dave Hansen
2010-09-27 19:28 ` [PATCH 7/8] v2 Define memory_block_size_bytes() for powerpc/pseries Nathan Fontenot
2010-09-27 19:28 ` Nathan Fontenot
2010-09-27 19:28 ` Nathan Fontenot
2010-09-27 19:28 ` [PATCH 8/8] v2 Update memory hotplug documentation Nathan Fontenot
2010-09-27 19:28 ` Nathan Fontenot
2010-09-27 19:28 ` Nathan Fontenot
2010-09-28 12:45 ` Avi Kivity
2010-09-28 12:45 ` Avi Kivity
2010-09-28 12:45 ` Avi Kivity
2010-09-28 18:18 ` Nathan Fontenot
2010-09-28 18:18 ` Nathan Fontenot
2010-09-28 18:18 ` Nathan Fontenot
2010-09-28 12:38 ` [PATCH 0/8] v2 De-Couple sysfs memory directories from memory sections Robin Holt
2010-09-28 12:38 ` Robin Holt
2010-09-28 12:38 ` Robin Holt
2010-09-28 18:17 ` Nathan Fontenot
2010-09-28 18:17 ` Nathan Fontenot
2010-09-28 18:17 ` Nathan Fontenot
2010-09-29 19:28 ` Robin Holt
2010-09-29 19:28 ` Robin Holt
2010-09-29 19:28 ` Robin Holt
2010-09-30 15:17 ` Nathan Fontenot
2010-09-30 15:17 ` Nathan Fontenot
2010-09-30 15:17 ` Nathan Fontenot
2010-09-30 16:39 ` Robin Holt
2010-09-30 16:39 ` Robin Holt
2010-09-30 16:39 ` Robin Holt
2010-09-28 12:44 ` Avi Kivity
2010-09-28 12:44 ` Avi Kivity
2010-09-28 12:44 ` Avi Kivity
2010-09-28 15:12 ` Robin Holt
2010-09-28 15:12 ` Robin Holt
2010-09-28 15:12 ` Robin Holt
2010-09-28 16:34 ` Avi Kivity [this message]
2010-09-28 16:34 ` Avi Kivity
2010-09-28 16:34 ` Avi Kivity
2010-09-29 2:50 ` Greg KH
2010-09-29 2:50 ` Greg KH
2010-09-29 2:50 ` Greg KH
2010-09-29 8:32 ` Avi Kivity
2010-09-29 8:32 ` Avi Kivity
2010-09-29 8:32 ` Avi Kivity
2010-09-29 12:37 ` Greg KH
2010-09-29 12:37 ` Greg KH
2010-09-29 12:37 ` Greg KH
2010-09-29 13:39 ` Kay Sievers
2010-09-29 13:39 ` Kay Sievers
2010-09-29 13:39 ` Kay Sievers
2010-10-03 7:52 ` Avi Kivity
2010-10-03 7:52 ` Avi Kivity
2010-10-03 7:52 ` Avi Kivity
2010-09-28 15:17 ` Dave Hansen
2010-09-28 15:17 ` Dave Hansen
2010-09-28 15:17 ` Dave Hansen
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