opd_kernel.c File Reference

#include "opd_kernel.h"
#include "opd_proc.h"
#include "opd_image.h"
#include "opd_mapping.h"
#include "opd_printf.h"
#include "opd_24_stats.h"
#include "oprofiled.h"
#include "op_fileio.h"
#include "op_config_24.h"
#include "op_libiberty.h"
#include "p_module.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>

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Data Structures
struct	opd_module
Functions
void	opd_init_kernel_image (void)
void	opd_parse_kernel_range (char const *arg)
static struct opd_module *	opd_create_module (char *name, unsigned long start, unsigned long end)
static struct opd_module *	opd_find_module_by_name (char *name)
void	opd_clear_module_info (void)
static void	opd_get_module_info (void)
static void	opd_drop_module_sample (unsigned long eip)
static struct opd_module *	opd_find_module_by_eip (unsigned long eip)
static void	opd_handle_module_sample (unsigned long eip, u32 counter)
void	opd_handle_kernel_sample (unsigned long eip, u32 counter)
int	opd_eip_is_kernel (unsigned long eip)
void	opd_add_kernel_map (struct opd_proc *proc, unsigned long eip)
Variables
static struct opd_image *	kernel_image
static unsigned long	kernel_start
static unsigned long	kernel_end
static struct list_head	opd_modules = { &opd_modules, &opd_modules }
static unsigned int	nr_modules = 0

Detailed Description

Dealing with the kernel and kernel module samples

Remarks:: Copyright 2002 OProfile authors; Read the file COPYING

Author:: John Levon; Philippe Elie

Definition in file opd_kernel.c.

Function Documentation

void opd_add_kernel_map	(	struct opd_proc *	proc,
		unsigned long	eip
	)

opd_add_kernel_map - add a module or kernel maps to a proc struct

Parameters:

	proc	owning proc of the new mapping
	eip	eip inside the new mapping

We assume than eip >= kernel_start

Definition at line 411 of file opd_kernel.c.

References app_name, opd_module::end, opd_module::image, kernel_end, kernel_start, opd_module::name, opd_image::name, opd_proc::name, opd_add_mapping(), opd_clear_module_info(), opd_drop_module_sample(), opd_find_module_by_eip(), opd_get_kernel_image(), opd_get_module_info(), opd_module::start, opd_proc::tgid, opd_proc::tid, verbprintf, vmisc, vmlinux, and vmodule.

Referenced by opd_put_sample().

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void opd_clear_module_info ( void )

opd_clear_module_info - clear kernel module information

Clear and free all kernel module information and reset values.

Definition at line 113 of file opd_kernel.c.

References list_entry, list_for_each_safe, list_init(), opd_module::module_list, opd_module::name, opd_clear_kernel_mapping(), verbprintf, and vmodule.

Referenced by opd_24_exit(), opd_add_kernel_map(), opd_do_notes(), and opd_handle_module_sample().

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static struct opd_module* opd_create_module	(	char *	name,
		unsigned long	start,
		unsigned long	end
	)			`[static, read]`

opd_create_module - allocate and initialise a module description

Parameters:

	name	module name
	start	start address
	end	end address

Definition at line 79 of file opd_kernel.c.

References opd_module::end, opd_module::image, list_add(), opd_module::module_list, opd_module::name, and opd_module::start.

Referenced by opd_drop_module_sample(), and opd_find_module_by_name().

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static void opd_drop_module_sample ( unsigned long eip ) [static]

opd_drop_module_sample - drop a module sample efficiently

Parameters:

eip

eip of sample

This function is called to recover from failing to put a samples even after re-reading /proc/ksyms. It's either a rogue sample, or from a module that didn't create symbols (like in some initrd setups). So we check with query_module() if we can place it in a symbol-less module, and if so create a negative entry for it, to quickly ignore future samples.

Problem uncovered by Bob Montgomery <bobm@fc.hp.com>

Definition at line 271 of file opd_kernel.c.

References module_info::addr, opd_module::name, opd_24_stats, opd_create_module(), OPD_LOST_MODULE, QM_INFO, QM_MODULES, query_module(), module_info::size, verbprintf, and vmodule.

Referenced by opd_add_kernel_map(), and opd_handle_module_sample().

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int opd_eip_is_kernel ( unsigned long eip )

opd_eip_is_kernel - is the sample from kernel/module space

Parameters:

eip

EIP value

Returns 1 if eip is in the address space starting at kernel_start, 0 otherwise.

Definition at line 394 of file opd_kernel.c.

References kernel_start.

Referenced by opd_put_sample(), and opd_remove_kernel_mapping().

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static struct opd_module* opd_find_module_by_eip ( unsigned long eip ) [static, read]

opd_find_module_by_eip - find a module by its eip

Parameters:

eip

EIP value

find in the modules container the module which contain this eip return NULL if not found. caller must check than the module image is valid

Definition at line 321 of file opd_kernel.c.

References opd_module::end, list_entry, list_for_each, opd_module::module_list, and opd_module::start.

Referenced by opd_add_kernel_map(), and opd_handle_module_sample().

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static struct opd_module* opd_find_module_by_name ( char * name ) [static, read]

opd_find_module_by_name - find a module by name, ccreating a new once if search fail

Parameters:

name

module name

Definition at line 98 of file opd_kernel.c.

References list_entry, list_for_each, opd_module::module_list, opd_module::name, and opd_create_module().

Referenced by opd_get_module_info().

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static void opd_get_module_info ( void ) [static]

opd_get_module_info - parse mapping information for kernel modules

Parse the file /proc/ksyms to read in mapping information for all kernel modules. The modutils package adds special symbols to this file which allows determination of the module image and mapping addresses of the form :

__insmod_modulename_Oobjectfile_Mmtime_Vversion __insmod_modulename_Ssectionname_Llength

Currently the image file "objectfile" is stored, and details of ".text" sections.

There is no query_module API that allow to get directly the pathname of a module so we need to parse all the /proc/ksyms.

Definition at line 149 of file opd_kernel.c.

References opd_module::end, filename, opd_module::image, nr_modules, op_close_file(), op_get_line(), op_try_open_file(), opd_find_module_by_name(), opd_get_kernel_image(), opd_image::ref_count, opd_module::start, verbprintf, and vmodule.

Referenced by opd_add_kernel_map(), and opd_handle_module_sample().

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void opd_handle_kernel_sample	(	unsigned long	eip,
		u32	counter
	)

opd_handle_kernel_sample - process a kernel sample

Parameters:

	eip	EIP value of sample
	counter	counter number

Handle a sample in kernel address space or in a module. The sample is output to the relevant image file.

Definition at line 381 of file opd_kernel.c.

References kernel_end, kernel_start, no_vmlinux, opd_24_stats, opd_handle_module_sample(), OPD_KERNEL, and opd_put_image_sample().

Referenced by opd_put_sample().

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static void opd_handle_module_sample	(	unsigned long	eip,
		u32	counter
	)			`[static]`

opd_handle_module_sample - process a module sample

Parameters:

	eip	EIP value
	counter	counter number

Process a sample in module address space. The sample eip is matched against module information. If the search was successful, the sample is output to the relevant file.

Note that for modules and the kernel, the offset will be wrong in the file, as it is not a file offset, but the offset from the text section. This is fixed up in pp.

If the sample could not be located in a module, it is treated as a kernel sample.

Definition at line 352 of file opd_kernel.c.

References opd_module::image, opd_module::name, opd_24_stats, opd_clear_module_info(), opd_drop_module_sample(), opd_find_module_by_eip(), opd_get_module_info(), OPD_LOST_MODULE, OPD_MODULE, opd_put_image_sample(), opd_module::start, verbprintf, and vmodule.