bfed1c3081
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. 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: Stephen Rothwell <sfr@canb.auug.org.au> (cherry picked from commit 3d9ebd4b5358d8fd4c270b516430169905c38686 https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm) (cherry picked from commit 2b7ef118b617be551c23e975dfe44588b180c536 https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm) Bug: 172318110 Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Change-Id: Id6730d66306531a9031ab6f6359a825869fa1890
34 lines
768 B
C
34 lines
768 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* A generic stack depot implementation
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*
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* Author: Alexander Potapenko <glider@google.com>
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* Copyright (C) 2016 Google, Inc.
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*
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* Based on code by Dmitry Chernenkov.
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*/
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#ifndef _LINUX_STACKDEPOT_H
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#define _LINUX_STACKDEPOT_H
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typedef u32 depot_stack_handle_t;
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depot_stack_handle_t stack_depot_save(unsigned long *entries,
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unsigned int nr_entries, gfp_t gfp_flags);
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unsigned int stack_depot_fetch(depot_stack_handle_t handle,
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unsigned long **entries);
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unsigned int filter_irq_stacks(unsigned long *entries, unsigned int nr_entries);
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#ifdef CONFIG_STACKDEPOT
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int stack_depot_init(void);
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#else
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static inline int stack_depot_init(void)
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{
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return 0;
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}
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#endif /* CONFIG_STACKDEPOT */
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#endif
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