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mm: bdi: allow setting a maximum for the bdi dirty limit

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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>
This commit is contained in:
Peter Zijlstra
2008-04-30 00:54:36 -07:00
committed by Linus Torvalds
parent 189d3c4a94
commit a42dde0415
6 changed files with 111 additions and 13 deletions
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13
include/linux/proportions.h
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@ -77,6 +77,19 @@ void prop_inc_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl)
local_irq_restore(flags);
}
/*
* Limit the time part in order to ensure there are some bits left for the
* cycle counter and fraction multiply.
*/
#define PROP_MAX_SHIFT (3*BITS_PER_LONG/4)
#define PROP_FRAC_SHIFT (BITS_PER_LONG - PROP_MAX_SHIFT - 1)
#define PROP_FRAC_BASE (1UL << PROP_FRAC_SHIFT)
void __prop_inc_percpu_max(struct prop_descriptor *pd,
struct prop_local_percpu *pl, long frac);
/*
* ----- SINGLE ------
*/