The patch titled
Subject: lib: stackdepot: add support to configure STACK_HASH_SIZE
has been removed from the -mm tree. Its filename was
lib-stackdepot-add-support-to-configure-stack_hash_size.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Yogesh Lal <ylal@xxxxxxxxxxxxxx>
Subject: 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.
Link: https://lkml.kernel.org/r/1603372546-27118-1-git-send-email-vjitta@xxxxxxxxxxxxxx
Signed-off-by: Yogesh Lal <ylal@xxxxxxxxxxxxxx>
Signed-off-by: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Signed-off-by: Vijayanand Jitta <vjitta@xxxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Zhenhua Huang <zhenhuah@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig | 9 +++++++++
lib/stackdepot.c | 3 +--
2 files changed, 10 insertions(+), 2 deletions(-)
--- a/lib/Kconfig~lib-stackdepot-add-support-to-configure-stack_hash_size
+++ a/lib/Kconfig
@@ -651,6 +651,15 @@ 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
--- a/lib/stackdepot.c~lib-stackdepot-add-support-to-configure-stack_hash_size
+++ a/lib/stackdepot.c
@@ -142,8 +142,7 @@ static struct stack_record *depot_alloc_
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
_
Patches currently in -mm which might be from ylal@xxxxxxxxxxxxxx are
