From: Johannes Stezenbach <js@sig21.net>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: huge debug_objects_cache. swapping but 25% mem free
Date: Wed, 1 Feb 2012 19:29:32 +0100 [thread overview]
Message-ID: <20120201182932.GA15518@sig21.net> (raw)
In-Reply-To: <20120130154048.GA421@sig21.net>
On Mon, Jan 30, 2012 at 04:40:48PM +0100, Johannes Stezenbach wrote:
>
> According to slabtop debug_objects_cache eats half the
> memory, is this expected? The Kconfig help text does not
> suggest it.
FWIW, today after running full backup using rsync:
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
4025450 4025447 99% 0.36K 183977 22 1471816K debug_objects_cache
170266 87241 51% 1.74K 9645 18 308640K ext3_inode_cache
54855 40215 73% 0.58K 2034 27 32544K dentry
38124 12474 32% 0.42K 2119 18 16952K buffer_head
17794 17464 98% 0.51K 574 31 9184K sysfs_dir_cache
11434 8494 74% 0.87K 713 18 11408K radix_tree_node
11400 5570 48% 0.38K 570 20 4560K kmalloc-64
/sys/kernel/debug/debug_objects/stats:
max_chain :870
warnings :0
fixups :0
pool_free :258
pool_min_free :252
pool_used :4025193
pool_max_used :4025195
then after "echo 3 >/proc/sys/vm/drop_caches":
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
4030488 4030485 99% 0.36K 184206 22 1473648K debug_objects_cache
17955 9071 50% 0.58K 665 27 10640K dentry
17763 17455 98% 0.51K 573 31 9168K sysfs_dir_cache
9408 9156 97% 0.33K 392 24 3136K kmalloc-8
I'm still not sure if this is normal behaviour of DEBUG_OBJECTS or a bug?
Anyway, I'm going to turn it off now.
Johannes
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Johannes Stezenbach <js@sig21.net>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: huge debug_objects_cache. swapping but 25% mem free
Date: Wed, 1 Feb 2012 19:29:32 +0100 [thread overview]
Message-ID: <20120201182932.GA15518@sig21.net> (raw)
In-Reply-To: <20120130154048.GA421@sig21.net>
On Mon, Jan 30, 2012 at 04:40:48PM +0100, Johannes Stezenbach wrote:
>
> According to slabtop debug_objects_cache eats half the
> memory, is this expected? The Kconfig help text does not
> suggest it.
FWIW, today after running full backup using rsync:
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
4025450 4025447 99% 0.36K 183977 22 1471816K debug_objects_cache
170266 87241 51% 1.74K 9645 18 308640K ext3_inode_cache
54855 40215 73% 0.58K 2034 27 32544K dentry
38124 12474 32% 0.42K 2119 18 16952K buffer_head
17794 17464 98% 0.51K 574 31 9184K sysfs_dir_cache
11434 8494 74% 0.87K 713 18 11408K radix_tree_node
11400 5570 48% 0.38K 570 20 4560K kmalloc-64
/sys/kernel/debug/debug_objects/stats:
max_chain :870
warnings :0
fixups :0
pool_free :258
pool_min_free :252
pool_used :4025193
pool_max_used :4025195
then after "echo 3 >/proc/sys/vm/drop_caches":
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
4030488 4030485 99% 0.36K 184206 22 1473648K debug_objects_cache
17955 9071 50% 0.58K 665 27 10640K dentry
17763 17455 98% 0.51K 573 31 9168K sysfs_dir_cache
9408 9156 97% 0.33K 392 24 3136K kmalloc-8
I'm still not sure if this is normal behaviour of DEBUG_OBJECTS or a bug?
Anyway, I'm going to turn it off now.
Johannes
next prev parent reply other threads:[~2012-02-01 18:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-30 15:40 huge debug_objects_cache. swapping but 25% mem free Johannes Stezenbach
2012-02-01 18:29 ` Johannes Stezenbach [this message]
2012-02-01 18:29 ` Johannes Stezenbach
2012-02-03 23:12 ` Andrew Morton
2012-02-03 23:12 ` Andrew Morton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120201182932.GA15518@sig21.net \
--to=js@sig21.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.