linux-ext4 - [Bug 15906] performance regression in "umount" of filesystems using barriers

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Message-Id: <201005210105.o4L157wo020900@demeter.kernel.org>
Date:	Fri, 21 May 2010 01:05:07 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15906] performance regression in "umount" of filesystems using
 barriers

https://bugzilla.kernel.org/show_bug.cgi?id=15906

Chuck Ebbert <cebbert@...hat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cebbert@...hat.com

--- Comment #26 from Chuck Ebbert <cebbert@...hat.com>  2010-05-21 01:04:55 ---
(In reply to comment #18)
> Created an attachment (id=26255)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=26255) [details]
> Explicitly pass in whether sb is pinned or not
> 

This patch is triggering a warning:

[ http://www.kerneloops.org/oops.php?number=3142224 ]

WARNING: at fs/fs-writeback.c:597 writeback_inodes_wb+0x229/0x380()
Hardware name: MS-7250
Modules linked in: fuse sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter
ip6_tables ipv6 ext2 dm_multipath kvm_amd kvm uinput snd_hda_codec_atihdmi
snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq
snd_seq_device rndis_wlan snd_pcm cfg80211 snd_timer snd rfkill soundcore
snd_page_alloc rndis_host edac_core ppdev cdc_ether i2c_nforce2 usbnet k8temp
edac_mce_amd parport_pc forcedeth mii parport serio_raw sha256_generic
aes_x86_64 aes_generic cbc dm_crypt firewire_ohci pata_acpi firewire_core
crc_itu_t floppy ata_generic pata_amd sata_nv radeon ttm drm_kms_helper drm
i2c_algo_bit i2c_core [last unloaded: scsi_wait_scan]
Pid: 1035, comm: flush-253:0 Not tainted 2.6.33.4-95.fc13.x86_64 #1
Call Trace:
[] warn_slowpath_common+0x77/0x8f
[] warn_slowpath_null+0xf/0x11
[] writeback_inodes_wb+0x229/0x380
[] wb_writeback+0x13d/0x1bc
[] ? call_rcu_sched+0x10/0x12
[] ? call_rcu+0x9/0xb
[] wb_do_writeback+0x69/0x14d
[] bdi_writeback_task+0x3a/0xaa
[] ? bdi_start_fn+0x0/0xd4
[] bdi_start_fn+0x6c/0xd4
[] ? bdi_start_fn+0x0/0xd4
[] kthread+0x7a/0x82
[] kernel_thread_helper+0x4/0x10
[] ? kthread+0x0/0x82
[] ? kernel_thread_helper+0x0/0x10

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