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

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From: bugzilla-daemon
Date: Tuesday, May 4, 2010 - 9:46 pm

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





--- Comment #12 from Eric Sandeen <sandeen@redhat.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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[Bug 15906] serious performance regression in "umount" on ..., bugzilla-daemon, (Tue May 4, 9:46 pm)