kmemtrace: Core implementation. (b9ce08c0) · Commits · 戴 / test

Documentation/kernel-parameters.txt

+10 −0

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		@@ -49,6 +49,7 @@ parameter is applicable:
		ISAPNP ISA PnP code is enabled.
		ISDN Appropriate ISDN support is enabled.
		JOY Appropriate joystick support is enabled.
		KMEMTRACE kmemtrace is enabled.
		LIBATA Libata driver is enabled
		LP Printer support is enabled.
		LOOP Loopback device support is enabled.
		@@ -1018,6 +1019,15 @@ and is between 256 and 4096 characters. It is defined in the file
		use the HighMem zone if it exists, and the Normal
		zone if it does not.

		kmemtrace.enable= [KNL,KMEMTRACE] Format: { yes \| no }
		Controls whether kmemtrace is enabled
		at boot-time.

		kmemtrace.subbufs=n [KNL,KMEMTRACE] Overrides the number of
		subbufs kmemtrace's relay channel has. Set this
		higher than default (KMEMTRACE_N_SUBBUFS in code) if
		you experience buffer overruns.

		movablecore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter
		is similar to kernelcore except it specifies the
		amount of memory used for migratable allocations.

MAINTAINERS

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		@@ -2565,6 +2565,12 @@ M: jason.wessel@windriver.com
		L: kgdb-bugreport@lists.sourceforge.net
		S: Maintained

		KMEMTRACE
		P: Eduard - Gabriel Munteanu
		M: eduard.munteanu@linux360.ro
		L: linux-kernel@vger.kernel.org
		S: Maintained

		KPROBES
		P: Ananth N Mavinakayanahalli
		M: ananth@in.ibm.com

include/linux/kmemtrace.h

0 → 100644

+85 −0

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		/*
		* Copyright (C) 2008 Eduard - Gabriel Munteanu
		*
		* This file is released under GPL version 2.
		*/

		#ifndef _LINUX_KMEMTRACE_H
		#define _LINUX_KMEMTRACE_H

		#ifdef __KERNEL__

		#include <linux/types.h>
		#include <linux/marker.h>

		enum kmemtrace_type_id {
		KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
		KMEMTRACE_TYPE_CACHE, /* kmem_cache_(). /
		KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
		};

		#ifdef CONFIG_KMEMTRACE

		extern void kmemtrace_init(void);

		static inline void kmemtrace_mark_alloc_node(enum kmemtrace_type_id type_id,
		unsigned long call_site,
		const void *ptr,
		size_t bytes_req,
		size_t bytes_alloc,
		gfp_t gfp_flags,
		int node)
		{
		trace_mark(kmemtrace_alloc, "type_id %d call_site %lu ptr %lu "
		"bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d",
		type_id, call_site, (unsigned long) ptr,
		bytes_req, bytes_alloc, (unsigned long) gfp_flags, node);
		}

		static inline void kmemtrace_mark_free(enum kmemtrace_type_id type_id,
		unsigned long call_site,
		const void *ptr)
		{
		trace_mark(kmemtrace_free, "type_id %d call_site %lu ptr %lu",
		type_id, call_site, (unsigned long) ptr);
		}

		#else /* CONFIG_KMEMTRACE */

		static inline void kmemtrace_init(void)
		{
		}

		static inline void kmemtrace_mark_alloc_node(enum kmemtrace_type_id type_id,
		unsigned long call_site,
		const void *ptr,
		size_t bytes_req,
		size_t bytes_alloc,
		gfp_t gfp_flags,
		int node)
		{
		}

		static inline void kmemtrace_mark_free(enum kmemtrace_type_id type_id,
		unsigned long call_site,
		const void *ptr)
		{
		}

		#endif /* CONFIG_KMEMTRACE */

		static inline void kmemtrace_mark_alloc(enum kmemtrace_type_id type_id,
		unsigned long call_site,
		const void *ptr,
		size_t bytes_req,
		size_t bytes_alloc,
		gfp_t gfp_flags)
		{
		kmemtrace_mark_alloc_node(type_id, call_site, ptr,
		bytes_req, bytes_alloc, gfp_flags, -1);
		}

		#endif /* __KERNEL__ */

		#endif /* _LINUX_KMEMTRACE_H */

init/main.c

+2 −0

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		@@ -69,6 +69,7 @@
		#include <asm/setup.h>
		#include <asm/sections.h>
		#include <asm/cacheflush.h>
		#include <linux/kmemtrace.h>

		#ifdef CONFIG_X86_LOCAL_APIC
		#include <asm/smp.h>
		@@ -653,6 +654,7 @@ asmlinkage void __init start_kernel(void)
		enable_debug_pagealloc();
		cpu_hotplug_init();
		kmem_cache_init();
		kmemtrace_init();
		debug_objects_mem_init();
		idr_init_cache();
		setup_per_cpu_pageset();

lib/Kconfig.debug

+28 −0

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		@@ -803,6 +803,34 @@ config FIREWIRE_OHCI_REMOTE_DMA

		If unsure, say N.

		config KMEMTRACE
		bool "Kernel memory tracer (kmemtrace)"
		depends on RELAY && DEBUG_FS && MARKERS
		help
		kmemtrace provides tracing for slab allocator functions, such as
		kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
		data is then fed to the userspace application in order to analyse
		allocation hotspots, internal fragmentation and so on, making it
		possible to see how well an allocator performs, as well as debug
		and profile kernel code.

		This requires an userspace application to use. See
		Documentation/vm/kmemtrace.txt for more information.

		Saying Y will make the kernel somewhat larger and slower. However,
		if you disable kmemtrace at run-time or boot-time, the performance
		impact is minimal (depending on the arch the kernel is built for).

		If unsure, say N.

		config KMEMTRACE_DEFAULT_ENABLED
		bool "Enabled by default at boot"
		depends on KMEMTRACE
		help
		Say Y here to enable kmemtrace at boot-time by default. Whatever
		the choice, the behavior can be overridden by a kernel parameter,
		as described in documentation.

		menuconfig BUILD_DOCSRC
		bool "Build targets in Documentation/ tree"
		depends on HEADERS_CHECK

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