opd_anon.c File Reference

#include "opd_anon.h"
#include "opd_trans.h"
#include "opd_sfile.h"
#include "opd_printf.h"
#include "op_libiberty.h"
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

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Defines
#define	HASH_SIZE   1024
#define	HASH_BITS   (HASH_SIZE - 1)
#define	LRU_SIZE   8192
#define	LRU_AMOUNT   (LRU_SIZE/8)
Functions
static void	do_lru (struct transient *trans)
static unsigned long	hash_anon (pid_t tgid, cookie_t app)
static void	clear_anon_maps (struct transient *trans)
static void	add_anon_mapping (struct transient *trans, vma_t start, vma_t end, char *name)
static void	get_anon_maps (struct transient *trans)
static int	anon_match (struct transient const *trans, struct anon_mapping const *anon)
struct anon_mapping *	find_anon_mapping (struct transient *trans)
void	anon_init (void)
Variables
static struct list_head	hashes [HASH_SIZE]
static struct list_head	lru
static size_t	nr_lru

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Detailed Description

Anonymous region handling.

Our caching of maps has some problems: if we get tgid reuse, and it's the same application, we might end up with wrong maps. The same happens in an unmap-remap case. There's not much we can do about this, we just hope it's not too common...

What is relatively common is expanding anon maps, which leaves us with lots of separate sample files.

Remarks:

Copyright 2005 OProfile authors

Read the file COPYING

Author:

John Levon Gisle Dankel

Definition in file opd_anon.c.

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Define Documentation

#define HASH_BITS   (HASH_SIZE - 1)

Definition at line 32 of file opd_anon.c.

Referenced by sfile_find(), and sfile_hash().

#define HASH_SIZE   1024

Definition at line 31 of file opd_anon.c.

Referenced by anon_init(), cookie_init(), hash_anon(), hash_cookie(), operf_sfile_init(), and sfile_init().

#define LRU_AMOUNT   (LRU_SIZE/8)

Definition at line 41 of file opd_anon.c.

#define LRU_SIZE   8192

Definition at line 40 of file opd_anon.c.

Referenced by add_anon_mapping().

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Function Documentation

static void add_anon_mapping	(	struct transient *	trans,
		vma_t	start,
		vma_t	end,
		char *	name
	)			[static]

Definition at line 109 of file opd_anon.c.

References anon_mapping::app_cookie, do_lru(), anon_mapping::end, hash_anon(), hashes, anon_mapping::list, list_add_tail(), lru, anon_mapping::lru_list, LRU_SIZE, MAX_IMAGE_NAME_SIZE, anon_mapping::name, nr_lru, anon_mapping::start, anon_mapping::tgid, operf_transient::tgid, trans, verbose_cookie(), and vmisc.

Referenced by get_anon_maps().

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void anon_init

(

void

)

Definition at line 220 of file opd_anon.c.

References HASH_SIZE, hashes, list_init(), and lru.

Referenced by opd_26_init().

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static int anon_match	(	struct transient const *	trans,
		struct anon_mapping const *	anon
	)			[static]

Definition at line 165 of file opd_anon.c.

References anon_mapping::app_cookie, anon_mapping::end, operf_transient::pc, anon_mapping::start, anon_mapping::tgid, operf_transient::tgid, and trans.

Referenced by find_anon_mapping().

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static void clear_anon_maps

(

struct transient *

trans

)

[static]

Definition at line 77 of file opd_anon.c.

References anon_mapping::app_cookie, clear_trans_current(), clear_trans_last(), hash_anon(), hashes, anon_mapping::list, list_del(), list_entry, list_for_each_safe, anon_mapping::lru_list, anon_mapping::name, nr_lru, sfile_clear_anon(), anon_mapping::tgid, operf_transient::tgid, trans, verbose_cookie(), and vmisc.

Referenced by find_anon_mapping().

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static void do_lru

(

struct transient *

trans

)

[static]

Definition at line 47 of file opd_anon.c.

References clear_trans_current(), clear_trans_last(), anon_mapping::list, list_del(), list_entry, list_for_each_safe, lru, LRU_AMOUNT, anon_mapping::lru_list, nr_lru, sfile_clear_anon(), and trans.

Referenced by add_anon_mapping().

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struct anon_mapping* find_anon_mapping

(

struct transient *

)

[read]

Try to find an anonymous mapping for the given pc/tgid pair.

Definition at line 179 of file opd_anon.c.

References anon_match(), clear_anon_maps(), anon_mapping::end, get_anon_maps(), hash_anon(), hashes, anon_mapping::list, list_add(), list_del(), list_entry, list_for_each, operf_transient::pc, anon_mapping::start, anon_mapping::tgid, operf_transient::tgid, trans, verbprintf, and vmisc.

Referenced by opd_put_ibs_sample(), and opd_put_sample().

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static void get_anon_maps

(

struct transient *

trans

)

[static]

Definition at line 131 of file opd_anon.c.

References add_anon_mapping(), buf, anon_mapping::end, MAX_IMAGE_NAME_SIZE, anon_mapping::name, anon_mapping::start, operf_transient::tgid, and trans.

Referenced by find_anon_mapping().

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static unsigned long hash_anon	(	pid_t	tgid,
		cookie_t	app
	)			[static]

Definition at line 71 of file opd_anon.c.

References DCOOKIE_SHIFT, and HASH_SIZE.

Referenced by add_anon_mapping(), clear_anon_maps(), and find_anon_mapping().

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Variable Documentation

struct list_head hashes[HASH_SIZE] [static]

Definition at line 43 of file opd_anon.c.

Referenced by add_anon_mapping(), anon_init(), clear_anon_maps(), and find_anon_mapping().

struct list_head lru [static]

Definition at line 44 of file opd_anon.c.

Referenced by add_anon_mapping(), anon_init(), do_lru(), for_each_sfile(), operf_sfile_find(), operf_sfile_lru_clear(), sfile_find(), and sfile_lru_clear().

size_t nr_lru [static]

Definition at line 45 of file opd_anon.c.

Referenced by add_anon_mapping(), clear_anon_maps(), and do_lru().