linux-ext4 - [Bug 15906] serious performance regression in "umount" on ext4 over LVM

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Date:	Wed, 5 May 2010 04:46:18 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15906] serious performance regression in "umount" on ext4 over
 LVM

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





--- Comment #12 from Eric Sandeen <sandeen@...hat.com>  2010-05-05 04:46:16 ---

so basically:

sync_inodes_sb
  bdi_sync_writeback (sync_mode = WB_SYNC_ALL)
    ...

writeback_inodes_wb
  writeback_single_inode
    ext4_write_inode
      if (WB_SYNC_ALL)
        ext4_force_commit <--- ouch.

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