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Commit 1c462be3 authored by Yogesh Lal's avatar Yogesh Lal
Browse files

lib: stackdepot: Add support to configure STACK_HASH_SIZE 



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: default avatarYogesh Lal <ylal@codeaurora.org>
parent 986b2b1e

lib/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -574,6 +574,15 @@ 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

lib/stackdepot.c

+1 −2
Original line number Diff line number Diff line
@@ -146,8 +146,7 @@ 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