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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-04-30 03:54:36 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 11:29:50 -0400
commita42dde04152750426cc620fd277e80fffae2f65a (patch)
tree98cdf246280c59e0bf044ae6d2c229fc27b73203 /include/linux/proportions.h
parent189d3c4a94ef19fca2a71a6a336e9fda900e25e7 (diff)
mm: bdi: allow setting a maximum for the bdi dirty limit
Add "max_ratio" to /sys/class/bdi. This indicates the maximum percentage of the global dirty threshold allocated to this bdi. [mszeredi@suse.cz] - fix parsing in max_ratio_store(). - export bdi_set_max_ratio() to modules - limit bdi_dirty with bdi->max_ratio - 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 'include/linux/proportions.h')
-rw-r--r--include/linux/proportions.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/proportions.h b/include/linux/proportions.h
index 2c3b3cad92be..5afc1b23346d 100644
--- a/include/linux/proportions.h
+++ b/include/linux/proportions.h
@@ -78,6 +78,19 @@ void prop_inc_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl)
78} 78}
79 79
80/* 80/*
81 * Limit the time part in order to ensure there are some bits left for the
82 * cycle counter and fraction multiply.
83 */
84#define PROP_MAX_SHIFT (3*BITS_PER_LONG/4)
85
86#define PROP_FRAC_SHIFT (BITS_PER_LONG - PROP_MAX_SHIFT - 1)
87#define PROP_FRAC_BASE (1UL << PROP_FRAC_SHIFT)
88
89void __prop_inc_percpu_max(struct prop_descriptor *pd,
90 struct prop_local_percpu *pl, long frac);
91
92
93/*
81 * ----- SINGLE ------ 94 * ----- SINGLE ------
82 */ 95 */
83 96