From 4350e33971590d26879c5567b136ff9a5ab12655 Mon Sep 17 00:00:00 2001 From: Yogesh Lal Date: Thu, 25 Feb 2021 17:21:24 -0800 Subject: [PATCH] lib: stackdepot: add support to configure STACK_HASH_SIZE Use CONFIG_STACK_HASH_ORDER 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, CONFIG_PAGE_OWNER works only if page_owner=on via kernel parameter on CONFIG_PAGE_OWNER configured system. Thus, unless admin enable it via command line option, the stackdepot will just waste 8M memory without any customer. 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/1611749198-24316-1-git-send-email-vjitta@codeaurora.org Signed-off-by: Yogesh Lal Signed-off-by: Vinayak Menon Signed-off-by: Vijayanand Jitta Reviewed-by: Minchan Kim Reviewed-by: Alexander Potapenko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/Kconfig | 9 +++++++++ lib/stackdepot.c | 3 +-- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/lib/Kconfig b/lib/Kconfig index 46806332a8cc2..a38cc61256f1a 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -651,6 +651,15 @@ config STACKDEPOT bool select STACKTRACE +config STACK_HASH_ORDER + 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 diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 890dcc2e984e3..4b9715470e872 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -141,8 +141,7 @@ 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) #define STACK_HASH_MASK (STACK_HASH_SIZE - 1) #define STACK_HASH_SEED 0x9747b28c -- 2.39.5