This is version 3 (I think) of my patches to improve NFS writeaback. Changes: - the code for adding legacy values to /proc/vmstat was broken. I haven't taken the approach that Michal and Jan discussed but a simpler (I hope) approach that just seq_puts() the lines at an appropriate place. - I've modified the handling of PF_LOCAL_THROTTLE - sufficiently that I dropped Jan's reviewed-by. Rather than invoking the same behaviour as BDI_CAP_STRICTLIMIT, I now just use the part I needed. So if the global threshold is not exceeded, PF_LOCAL_THROTTLE tasks are not throttled. This is the case for normal processes, but not when BDI_CAP_STRICTLIMIT is in effect. If the global threshold *is* exceeded, only then to we check the local per-bdi threshold. If that is not exceeded then PF_LOCAL_THROTTLE again avoid any throttling. Only if both the thresholds are exceeded are these tasks throttled. I think this is more refletive if what we actually need. Thanks, NeilBrown
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