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authorVijayanand Jitta <vjitta@codeaurora.org>2021-02-26 04:21:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 20:41:04 +0300
commite1fdc403349c64fa58f4c163f4bf9b860b4db808 (patch)
tree18d2e4c6908552dccc5069f3aa393e39f0ca9655 /include
parentd262093656a0eec6d6114a3178a9d887fddd0ded (diff)
downloadlinux-e1fdc403349c64fa58f4c163f4bf9b860b4db808.tar.xz
lib: stackdepot: add support to disable stack depot
Add a kernel parameter stack_depot_disable to disable stack depot. So that stack hash table doesn't consume any memory when stack depot is disabled. The use case is CONFIG_PAGE_OWNER without page_owner=on. Without this patch, stackdepot will consume the memory for the hashtable. By default, it's 8M which is never trivial. With this option, in CONFIG_PAGE_OWNER configured system, page_owner=off, stack_depot_disable in kernel command line, we could save the wasted memory for the hashtable. [akpm@linux-foundation.org: fix CONFIG_STACKDEPOT=n build] Link: https://lkml.kernel.org/r/1611749198-24316-2-git-send-email-vjitta@codeaurora.org Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org> Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org> Cc: Alexander Potapenko <glider@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Yogesh Lal <ylal@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/stackdepot.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
index 24d49c732341..6bb4bc1a5f54 100644
--- a/include/linux/stackdepot.h
+++ b/include/linux/stackdepot.h
@@ -21,4 +21,13 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle,
unsigned int filter_irq_stacks(unsigned long *entries, unsigned int nr_entries);
+#ifdef CONFIG_STACKDEPOT
+int stack_depot_init(void);
+#else
+static inline int stack_depot_init(void)
+{
+ return 0;
+}
+#endif /* CONFIG_STACKDEPOT */
+
#endif