Lars-Peter Clausen 472fdec738 regmap: rbtree: Reduce number of nodes, take 2 ... Support for reducing the number of nodes and memory consumption of the rbtree cache by allowing for small unused holes in the node's register cache block was initially added in commit 0c7ed856 ("regmap: Cut down on the average # of nodes in the rbtree cache"). But the commit had problems and so its effect was reverted again in commit 4e67fb5 ("regmap: rbtree: Fix overlapping rbnodes."). This patch brings the feature back of reducing the average number of nodes, which will speedup node look-up, while at the same time also reducing the memory usage of the rbtree cache. This patch takes a slightly different approach than the original patch though. It modifies the adjacent node look-up to not only consider nodes that are just one to the left or the right of the register but any node that falls in a certain range around the register. The range is calculated based on how much memory it would take to allocate a new node compared to how much memory it takes adding a set of unused registers to an existing node. E.g. if a node takes up 24 bytes and each register in a block uses 1 byte the range will be from the register address - 24 to the register address + 24. If we find a node that falls within this range it is cheaper or as expensive to add the register to the existing node and have a couple of unused registers in the node's cache compared to allocating a new node. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>		2013-08-29 13:32:40 +01:00
..
internal.h	regmap: fix regcache_reg_present() for empty cache	2013-08-09 12:47:29 +01:00
Kconfig	regmap: select REGMAP if REGMAP_MMIO and REGMAP_IRQ enabled	2012-10-17 22:09:35 +09:00
Makefile	regmap: flat: Add flat cache type	2013-01-02 10:58:53 +00:00
regcache-flat.c	regmap: flat: Add flat cache type	2013-01-02 10:58:53 +00:00
regcache-lzo.c	regmap: cache: Pass the map rather than the word size when updating values	2013-03-04 10:30:27 +08:00
regcache-rbtree.c	regmap: rbtree: Reduce number of nodes, take 2	2013-08-29 13:32:40 +01:00
regcache.c	Merge remote-tracking branch 'regmap/topic/cache' into regmap-rbtree	2013-08-29 13:32:36 +01:00
regmap-debugfs.c	Merge remote-tracking branch 'regmap/topic/debugfs' into regmap-next	2013-06-30 12:40:02 +01:00
regmap-i2c.c	i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING	2012-05-30 10:55:34 +02:00
regmap-irq.c	regmap: irq: Clarify error message when we fail to request primary IRQ	2013-03-19 10:50:56 +00:00
regmap-mmio.c	regmap: mmio: add register clock support	2013-02-14 16:40:28 +00:00
regmap-spi.c	regmap: spi: Handle allocation failures gracefully	2013-02-05 14:14:32 +00:00
regmap.c	regmap: regcache: allow read-only regs to be cached	2013-08-09 12:47:29 +01:00