[PATCH v2] regmap: Expose total memory consumption in the rbtree debugfs entry

Dimitris Papastamos
2013-03-12T17:26:52Z

Provide a feel of how much overhead the rbtree cache adds to
the game.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
---
Print the size in bytes instead of kB.

drivers/base/regmap/regcache-rbtree.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 461cff8..11011ec 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -138,15 +138,20 @@ static int rbtree_show(struct seq_file *s, void *ignored)
struct regcache_rbtree_node *n;
struct rb_node *node;
unsigned int base, top;
+ size_t mem_size;
int nodes = 0;
int registers = 0;
int this_registers, average;

map->lock(map);

+ mem_size = sizeof(*rbtree_ctx);
+
for (node = rb_first(&rbtree_ctx->root); node != NULL;
node = rb_next(node)) {
n = container_of(node, struct regcache_rbtree_node, node);
+ mem_size += sizeof(*n);
+ mem_size += (n->blklen * map->cache_word_size);

regcache_rbtree_get_base_top_reg(map, n, &base, &top);
this_registers = ((top - base) / map->reg_stride) + 1;
@@ -161,8 +166,8 @@ static int rbtree_show(struct seq_file *s, void *ignored)
else
average = 0;

- seq_printf(s, "%d nodes, %d registers, average %d registers\n",
- nodes, registers, average);
+ seq_printf(s, "%d nodes, %d registers, average %d registers, memory overhead %zuB\n",
+ nodes, registers, average, mem_size);

map->unlock(map);

--
1.8.1.5