189d3c4a94
Under normal circumstances each device is given a part of the total write-back cache that relates to its current avg writeout speed in relation to the other devices. min_ratio - allows one to assign a minimum portion of the write-back cache to a particular device. This is useful in situations where you might want to provide a minimum QoS. (One request for this feature came from flash based storage people who wanted to avoid writing out at all costs - they of course needed some pdflush hacks as well) max_ratio - allows one to assign a maximum portion of the dirty limit to a particular device. This is useful in situations where you want to avoid one device taking all or most of the write-back cache. Eg. an NFS mount that is prone to get stuck, or a FUSE mount which you don't trust to play fair. Add "min_ratio" to /sys/class/bdi. This indicates the minimum percentage of the global dirty threshold allocated to this bdi. [mszeredi@suse.cz] - fix parsing in min_ratio_store() - document new sysfs attribute Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| .. | ||
| debugfs-pktcdvd | ||
| procfs-diskstats | ||
| sysfs-block | ||
| sysfs-bus-pci | ||
| sysfs-bus-usb | ||
| sysfs-class | ||
| sysfs-class-bdi | ||
| sysfs-class-pktcdvd | ||
| sysfs-devices | ||
| sysfs-firmware-acpi | ||
| sysfs-ibft | ||
| sysfs-kernel-uids | ||
| sysfs-ocfs2 | ||
| sysfs-power | ||