summaryrefslogtreecommitdiffstats
path: root/Documentation/acpi
diff options
context:
space:
mode:
authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-04-30 09:54:35 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 17:29:50 +0200
commit189d3c4a94ef19fca2a71a6a336e9fda900e25e7 (patch)
tree75c0de871fe9922885a2fa073f15806d829342fa /Documentation/acpi
parentmm: bdi: expose the BDI object in sysfs for FUSE (diff)
downloadlinux-189d3c4a94ef19fca2a71a6a336e9fda900e25e7.tar.xz
linux-189d3c4a94ef19fca2a71a6a336e9fda900e25e7.zip
mm: bdi: allow setting a minimum for the bdi dirty limit
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>
Diffstat (limited to 'Documentation/acpi')
0 files changed, 0 insertions, 0 deletions