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lib: stackdepot: Add support to configure STACK_HASH_SIZE

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Use STACK_HASH_ORDER_SHIFT to configure STACK_HASH_SIZE.

Aim is to have configurable value for  STACK_HASH_SIZE,
so depend on use case one can configure it.

One example is of Page Owner, default value of
STACK_HASH_SIZE lead stack depot to consume 8MB of static memory.
Making it configurable and use lower value helps to enable features like
CONFIG_PAGE_OWNER without any significant overhead.

Change-Id: If6b64d4d4d42c763b00e2719fde5a25e94c10597
Signed-off-by: Yogesh Lal <[email protected]>
Signed-off-by: Vinayak Menon <[email protected]>
This commit is contained in:
Yogesh Lal 2018-06-07 11:44:53 +05:30 • committed by Gerrit - the friendly Code Review server
commit 1c59265975
2 changed files with 10 additions and 2 deletions
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9
lib/Kconfig
View file

@ -623,6 +623,15 @@ config STACKDEPOT
bool
select STACKTRACE
config STACK_HASH_ORDER_SHIFT
int "stack depot hash size (12 => 4KB, 20 => 1024KB)"
range 12 20
default 20
depends on STACKDEPOT
help
Select the hash size as a power of 2 for the stackdepot hash table.
Choose a lower value to reduce the memory impact.
config SBITMAP
bool

3
lib/stackdepot.c
View file

@ -137,8 +137,7 @@ static struct stack_record *depot_alloc_stack(unsigned long *entries, int size,
return stack;
}
#define STACK_HASH_ORDER 20
#define STACK_HASH_SIZE (1L << STACK_HASH_ORDER)
#define STACK_HASH_SIZE (1L << CONFIG_STACK_HASH_ORDER_SHIFT)
#define STACK_HASH_MASK (STACK_HASH_SIZE - 1)
#define STACK_HASH_SEED 0x9747b28c