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9.26. Delayed write buffers
xfsbufd
kernel thread, one per filesystem device
buffers are time stamped when queued
xfsbufd walks the xfs_buftarg_t (“buffer target”) hash table finding delayed write buffers
default is every 5 seconds look for buffers more than 30 seconds old
metadata and log data specific, file data is handled differently
Tweak the age at which unpinned and dirty metadata buffers will be considered for flushing
/proc/sys/fs/xfs/age_buffer_centisecs
Tunable daemon wakeup interval
/proc/sys/fs/xfs/xfsbufd_centisecs
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9.25. Metadata I/O Completion
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9.27. I/O Path
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