dwarves/pahole.c

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/*
Copyright (C) 2006 Mandriva Conectiva S.A.
Copyright (C) 2006 Arnaldo Carvalho de Melo <acme@mandriva.com>
Copyright (C) 2007 Arnaldo Carvalho de Melo <acme@redhat.com>
This program is free software; you can redistribute it and/or modify it
under the terms of version 2 of the GNU General Public License as
published by the Free Software Foundation.
*/
#include <getopt.h>
#include <stdio.h>
#include <dwarf.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "dwarves.h"
static uint8_t class__include_anonymous;
static uint8_t class__include_nested_anonymous;
static char *class__exclude_prefix;
static size_t class__exclude_prefix_len;
static char *cu__exclude_prefix;
static size_t cu__exclude_prefix_len;
static char *decl_exclude_prefix;
static size_t decl_exclude_prefix_len;
static uint16_t nr_holes;
static uint16_t nr_bit_holes;
static uint8_t show_packable;
static uint8_t verbose;
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
static uint8_t expand_types;
struct structure {
struct list_head node;
const struct class *class;
const struct cu *cu;
uint32_t nr_files;
uint32_t nr_methods;
};
static struct structure *structure__new(const struct class *class,
const struct cu *cu)
{
struct structure *self = malloc(sizeof(*self));
if (self != NULL) {
self->class = class;
self->cu = cu;
self->nr_files = 1;
self->nr_methods = 0;
}
return self;
}
static LIST_HEAD(structures__list);
static struct structure *structures__find(const char *name)
{
struct structure *pos;
if (name == NULL)
return NULL;
list_for_each_entry(pos, &structures__list, node) {
const char *class_name = class__name(pos->class);
if (class_name != NULL &&
strcmp(class__name(pos->class), name) == 0)
return pos;
}
return NULL;
}
static void structures__add(const struct class *class, const struct cu *cu)
{
struct structure *str = structure__new(class, cu);
if (str != NULL)
list_add(&str->node, &structures__list);
}
static void nr_definitions_formatter(const struct structure *self)
{
printf("%s: %u\n", class__name(self->class), self->nr_files);
}
static void nr_members_formatter(const struct structure *self)
{
printf("%s: %u\n", class__name(self->class),
class__nr_members(self->class));
}
static void nr_methods_formatter(const struct structure *self)
{
printf("%s: %u\n", class__name(self->class), self->nr_methods);
}
static void size_formatter(const struct structure *self)
{
printf("%s: %u %u\n", class__name(self->class),
class__size(self->class), self->class->nr_holes);
}
static void class_name_len_formatter(const struct structure *self)
{
const char *name = class__name(self->class);
printf("%s: %u\n", name, strlen(name));
}
static void class_formatter(const struct structure *self)
{
struct tag *typedef_alias = NULL;
struct tag *tag = class__tag(self->class);
const char *name = class__name(self->class);
if (name == NULL) {
/*
* Find the first typedef for this struct, this is enough
* as if we optimize the struct all the typedefs will be
* affected.
*/
typedef_alias = cu__find_first_typedef_of_type(self->cu,
tag->id);
/*
* If there is no typedefs for this anonymous struct it is
* found just inside another struct, and in this case it'll
* be printed when the type it is in is printed, but if
* the user still wants to see its statistics, just use
* --nested_anon_include.
*/
if (typedef_alias == NULL && !class__include_nested_anonymous)
return;
}
if (typedef_alias != NULL) {
const struct type *tdef = tag__type(typedef_alias);
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
tag__print(tag, self->cu, "typedef", tdef->name, expand_types);
} else
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
tag__print(tag, self->cu, NULL, NULL, expand_types);
printf(" /* definitions: %u */\n", self->nr_files);
putchar('\n');
}
static void print_classes(void (*formatter)(const struct structure *s))
{
struct structure *pos;
list_for_each_entry(pos, &structures__list, node)
formatter(pos);
}
static struct cu *cu__filter(struct cu *cu)
{
if (cu__exclude_prefix != NULL &&
(cu->name == NULL ||
strncmp(cu__exclude_prefix, cu->name,
cu__exclude_prefix_len) == 0))
return NULL;
return cu;
}
static int class__packable(const struct class *self)
{
struct class_member *pos;
if (self->nr_holes == 0 && self->nr_bit_holes == 0)
return 0;
list_for_each_entry(pos, &self->type.members, tag.node)
if (pos->hole != 0 &&
class__find_bit_hole(self, pos, pos->hole * 8) != NULL)
return 1;
else if (pos->bit_hole != 0 &&
class__find_bit_hole(self, pos, pos->bit_hole) != NULL)
return 1;
return 0;
}
static void class__dupmsg(const struct class *self, const struct cu *cu,
const struct class *dup __unused,
const struct cu *dup_cu,
char *hdr, const char *fmt, ...)
{
va_list args;
if (!*hdr)
printf("class: %s\nfirst: %s\ncurrent: %s\n",
class__name(self), cu->name, dup_cu->name);
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
*hdr = 1;
}
static void class__chkdupdef(const struct class *self, const struct cu *cu,
struct class *dup, const struct cu *dup_cu)
{
char hdr = 0;
if (class__size(self) != class__size(dup))
class__dupmsg(self, cu, dup, dup_cu,
&hdr, "size: %u != %u\n",
class__size(self), class__size(dup));
if (class__nr_members(self) != class__nr_members(dup))
class__dupmsg(self, cu, dup, dup_cu,
&hdr, "nr_members: %u != %u\n",
class__nr_members(self), class__nr_members(dup));
if (self->nr_holes != dup->nr_holes)
class__dupmsg(self, cu, dup, dup_cu,
&hdr, "nr_holes: %u != %u\n",
self->nr_holes, dup->nr_holes);
if (self->nr_bit_holes != dup->nr_bit_holes)
class__dupmsg(self, cu, dup, dup_cu,
&hdr, "nr_bit_holes: %u != %u\n",
self->nr_bit_holes, dup->nr_bit_holes);
if (self->padding != dup->padding)
class__dupmsg(self, cu, dup, dup_cu,
&hdr, "padding: %u != %u\n",
self->padding, dup->padding);
/* XXX put more checks here: member types, member ordering, etc */
if (hdr)
putchar('\n');
}
static struct tag *tag__filter(struct tag *tag, struct cu *cu,
void *cookie __unused)
{
struct structure *str;
struct class *class;
const char *name;
if (tag->tag != DW_TAG_structure_type)
return NULL;
class = tag__class(tag);
name = class__name(class);
if (class__is_declaration(class))
return NULL;
if (!class__include_anonymous && name == NULL)
return NULL;
if (class__exclude_prefix != NULL && name &&
strncmp(class__exclude_prefix, name,
class__exclude_prefix_len) == 0)
return NULL;
if (decl_exclude_prefix != NULL &&
(tag->decl_file == NULL ||
strncmp(decl_exclude_prefix, tag->decl_file,
decl_exclude_prefix_len) == 0))
return NULL;
class__find_holes(class, cu);
if (class->nr_holes < nr_holes ||
class->nr_bit_holes < nr_bit_holes)
return NULL;
str = structures__find(name);
if (str != NULL) {
if (verbose)
class__chkdupdef(str->class, str->cu, class, cu);
str->nr_files++;
return NULL;
}
if (show_packable && !class__packable(class))
return NULL;
return tag;
}
static int unique_iterator(struct tag *tag, struct cu *cu,
void *cookie __unused)
{
structures__add(tag__class(tag), cu);
return 0;
}
static int cu_unique_iterator(struct cu *cu, void *cookie)
{
return cu__for_each_tag(cu, unique_iterator, cookie, tag__filter);
}
static struct tag *nr_methods__filter(struct tag *tag, struct cu *cu __unused,
void *cookie __unused)
{
if (tag->tag != DW_TAG_subprogram)
return NULL;
if (function__declared_inline(tag__function(tag)))
return NULL;
return tag;
}
static int nr_methods_iterator(struct tag *tag, struct cu *cu,
void *cookie __unused)
{
struct parameter *pos;
struct structure *str;
struct type *ctype;
list_for_each_entry(pos, &tag__ftype(tag)->parms, tag.node) {
struct tag *type =
cu__find_tag_by_id(cu, parameter__type(pos, cu));
if (type == NULL || type->tag != DW_TAG_pointer_type)
continue;
type = cu__find_tag_by_id(cu, type->type);
if (type == NULL || type->tag != DW_TAG_structure_type)
continue;
ctype = tag__type(type);
if (ctype->name == NULL)
continue;
str = structures__find(ctype->name);
if (str != NULL)
++str->nr_methods;
}
return 0;
}
static int cu_nr_methods_iterator(struct cu *cu, void *cookie)
{
return cu__for_each_tag(cu, nr_methods_iterator, cookie,
nr_methods__filter);
}
static struct option long_options[] = {
[PAHOLE]: Print cacheline boundaries Cacheline size defaults to 32, sample output changing the default to 64 bytes: pahole --cacheline=64 ../../acme/OUTPUT/qemu/net-2.6/net/ipv4/tcp.o inode /* /pub/scm/linux/kernel/git/acme/net-2.6/include/linux/dcache.h:86 */ struct inode { struct hlist_node i_hash; /* 0 8 */ struct list_head i_list; /* 8 8 */ struct list_head i_sb_list; /* 16 8 */ struct list_head i_dentry; /* 24 8 */ long unsigned int i_ino; /* 32 4 */ atomic_t i_count; /* 36 4 */ umode_t i_mode; /* 40 2 */ /* XXX 2 bytes hole, try to pack */ unsigned int i_nlink; /* 44 4 */ uid_t i_uid; /* 48 4 */ gid_t i_gid; /* 52 4 */ dev_t i_rdev; /* 56 4 */ loff_t i_size; /* 60 8 */ struct timespec i_atime; /* 68 8 */ struct timespec i_mtime; /* 76 8 */ struct timespec i_ctime; /* 84 8 */ unsigned int i_blkbits; /* 92 4 */ long unsigned int i_version; /* 96 4 */ blkcnt_t i_blocks; /* 100 4 */ short unsigned int i_bytes; /* 104 2 */ spinlock_t i_lock; /* 106 0 */ /* XXX 2 bytes hole, try to pack */ struct mutex i_mutex; /* 108 24 */ /* ---------- cacheline 2 boundary ---------- */ struct rw_semaphore i_alloc_sem; /* 132 12 */ struct inode_operations * i_op; /* 144 4 */ const struct file_operations * i_fop; /* 148 4 */ struct super_block * i_sb; /* 152 4 */ struct file_lock * i_flock; /* 156 4 */ struct address_space * i_mapping; /* 160 4 */ struct address_space i_data; /* 164 72 */ struct list_head i_devices; /* 236 8 */ union ; /* 244 4 */ int i_cindex; /* 248 4 */ __u32 i_generation; /* 252 4 */ long unsigned int i_dnotify_mask; /* 256 4 */ /* ---------- cacheline 4 boundary ---------- */ struct dnotify_struct * i_dnotify; /* 260 4 */ struct list_head inotify_watches; /* 264 8 */ struct mutex inotify_mutex; /* 272 24 */ long unsigned int i_state; /* 296 4 */ long unsigned int dirtied_when; /* 300 4 */ unsigned int i_flags; /* 304 4 */ atomic_t i_writecount; /* 308 4 */ void * i_private; /* 312 4 */ }; /* size: 316, sum members: 312, holes: 2, sum holes: 4 */ Has to be improved to show the other cacheline boundaries, that may be buried into a included struct or union. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-11-05 18:34:54 +01:00
{ "cacheline_size", required_argument, NULL, 'c' },
{ "class_name_len", no_argument, NULL, 'N' },
{ "help", no_argument, NULL, 'h' },
{ "bit_holes", required_argument, NULL, 'B' },
{ "holes", required_argument, NULL, 'H' },
{ "nr_members", no_argument, NULL, 'n' },
{ "sizes", no_argument, NULL, 's' },
{ "nr_definitions", no_argument, NULL, 't' },
{ "nr_methods", no_argument, NULL, 'm' },
{ "exclude", required_argument, NULL, 'x' },
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
{ "expand_types", no_argument, NULL, 'e' },
{ "cu_exclude", required_argument, NULL, 'X' },
{ "decl_exclude", required_argument, NULL, 'D' },
{ "anon_include", no_argument, NULL, 'a' },
{ "nested_anon_include",no_argument, NULL, 'A' },
{ "packable", no_argument, NULL, 'p' },
{ "verbose", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0, }
};
static void usage(void)
{
fprintf(stderr,
"usage: pahole [options] <file_name> {<class_name>}\n"
" where: \n"
[PAHOLE]: Print cacheline boundaries Cacheline size defaults to 32, sample output changing the default to 64 bytes: pahole --cacheline=64 ../../acme/OUTPUT/qemu/net-2.6/net/ipv4/tcp.o inode /* /pub/scm/linux/kernel/git/acme/net-2.6/include/linux/dcache.h:86 */ struct inode { struct hlist_node i_hash; /* 0 8 */ struct list_head i_list; /* 8 8 */ struct list_head i_sb_list; /* 16 8 */ struct list_head i_dentry; /* 24 8 */ long unsigned int i_ino; /* 32 4 */ atomic_t i_count; /* 36 4 */ umode_t i_mode; /* 40 2 */ /* XXX 2 bytes hole, try to pack */ unsigned int i_nlink; /* 44 4 */ uid_t i_uid; /* 48 4 */ gid_t i_gid; /* 52 4 */ dev_t i_rdev; /* 56 4 */ loff_t i_size; /* 60 8 */ struct timespec i_atime; /* 68 8 */ struct timespec i_mtime; /* 76 8 */ struct timespec i_ctime; /* 84 8 */ unsigned int i_blkbits; /* 92 4 */ long unsigned int i_version; /* 96 4 */ blkcnt_t i_blocks; /* 100 4 */ short unsigned int i_bytes; /* 104 2 */ spinlock_t i_lock; /* 106 0 */ /* XXX 2 bytes hole, try to pack */ struct mutex i_mutex; /* 108 24 */ /* ---------- cacheline 2 boundary ---------- */ struct rw_semaphore i_alloc_sem; /* 132 12 */ struct inode_operations * i_op; /* 144 4 */ const struct file_operations * i_fop; /* 148 4 */ struct super_block * i_sb; /* 152 4 */ struct file_lock * i_flock; /* 156 4 */ struct address_space * i_mapping; /* 160 4 */ struct address_space i_data; /* 164 72 */ struct list_head i_devices; /* 236 8 */ union ; /* 244 4 */ int i_cindex; /* 248 4 */ __u32 i_generation; /* 252 4 */ long unsigned int i_dnotify_mask; /* 256 4 */ /* ---------- cacheline 4 boundary ---------- */ struct dnotify_struct * i_dnotify; /* 260 4 */ struct list_head inotify_watches; /* 264 8 */ struct mutex inotify_mutex; /* 272 24 */ long unsigned int i_state; /* 296 4 */ long unsigned int dirtied_when; /* 300 4 */ unsigned int i_flags; /* 304 4 */ atomic_t i_writecount; /* 308 4 */ void * i_private; /* 312 4 */ }; /* size: 316, sum members: 312, holes: 2, sum holes: 4 */ Has to be improved to show the other cacheline boundaries, that may be buried into a included struct or union. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-11-05 18:34:54 +01:00
" -h, --help show usage info\n"
" -B, --bit_holes <nr_holes> show only structs at least "
"<nr_holes> bit holes\n"
" -H, --holes <nr_holes> show only structs at least "
"<nr_holes> holes\n"
" -p, --packable show only structs that has "
"holes that can be packed\n"
" -c, --cacheline_size <size> set cacheline size\n"
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
" -e, --expand_types expand class members\n"
" -n, --nr_members show number of members\n"
[PAHOLE]: Print cacheline boundaries Cacheline size defaults to 32, sample output changing the default to 64 bytes: pahole --cacheline=64 ../../acme/OUTPUT/qemu/net-2.6/net/ipv4/tcp.o inode /* /pub/scm/linux/kernel/git/acme/net-2.6/include/linux/dcache.h:86 */ struct inode { struct hlist_node i_hash; /* 0 8 */ struct list_head i_list; /* 8 8 */ struct list_head i_sb_list; /* 16 8 */ struct list_head i_dentry; /* 24 8 */ long unsigned int i_ino; /* 32 4 */ atomic_t i_count; /* 36 4 */ umode_t i_mode; /* 40 2 */ /* XXX 2 bytes hole, try to pack */ unsigned int i_nlink; /* 44 4 */ uid_t i_uid; /* 48 4 */ gid_t i_gid; /* 52 4 */ dev_t i_rdev; /* 56 4 */ loff_t i_size; /* 60 8 */ struct timespec i_atime; /* 68 8 */ struct timespec i_mtime; /* 76 8 */ struct timespec i_ctime; /* 84 8 */ unsigned int i_blkbits; /* 92 4 */ long unsigned int i_version; /* 96 4 */ blkcnt_t i_blocks; /* 100 4 */ short unsigned int i_bytes; /* 104 2 */ spinlock_t i_lock; /* 106 0 */ /* XXX 2 bytes hole, try to pack */ struct mutex i_mutex; /* 108 24 */ /* ---------- cacheline 2 boundary ---------- */ struct rw_semaphore i_alloc_sem; /* 132 12 */ struct inode_operations * i_op; /* 144 4 */ const struct file_operations * i_fop; /* 148 4 */ struct super_block * i_sb; /* 152 4 */ struct file_lock * i_flock; /* 156 4 */ struct address_space * i_mapping; /* 160 4 */ struct address_space i_data; /* 164 72 */ struct list_head i_devices; /* 236 8 */ union ; /* 244 4 */ int i_cindex; /* 248 4 */ __u32 i_generation; /* 252 4 */ long unsigned int i_dnotify_mask; /* 256 4 */ /* ---------- cacheline 4 boundary ---------- */ struct dnotify_struct * i_dnotify; /* 260 4 */ struct list_head inotify_watches; /* 264 8 */ struct mutex inotify_mutex; /* 272 24 */ long unsigned int i_state; /* 296 4 */ long unsigned int dirtied_when; /* 300 4 */ unsigned int i_flags; /* 304 4 */ atomic_t i_writecount; /* 308 4 */ void * i_private; /* 312 4 */ }; /* size: 316, sum members: 312, holes: 2, sum holes: 4 */ Has to be improved to show the other cacheline boundaries, that may be buried into a included struct or union. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-11-05 18:34:54 +01:00
" -N, --class_name_len show size of classes\n"
" -m, --nr_methods show number of methods\n"
[PAHOLE]: Print cacheline boundaries Cacheline size defaults to 32, sample output changing the default to 64 bytes: pahole --cacheline=64 ../../acme/OUTPUT/qemu/net-2.6/net/ipv4/tcp.o inode /* /pub/scm/linux/kernel/git/acme/net-2.6/include/linux/dcache.h:86 */ struct inode { struct hlist_node i_hash; /* 0 8 */ struct list_head i_list; /* 8 8 */ struct list_head i_sb_list; /* 16 8 */ struct list_head i_dentry; /* 24 8 */ long unsigned int i_ino; /* 32 4 */ atomic_t i_count; /* 36 4 */ umode_t i_mode; /* 40 2 */ /* XXX 2 bytes hole, try to pack */ unsigned int i_nlink; /* 44 4 */ uid_t i_uid; /* 48 4 */ gid_t i_gid; /* 52 4 */ dev_t i_rdev; /* 56 4 */ loff_t i_size; /* 60 8 */ struct timespec i_atime; /* 68 8 */ struct timespec i_mtime; /* 76 8 */ struct timespec i_ctime; /* 84 8 */ unsigned int i_blkbits; /* 92 4 */ long unsigned int i_version; /* 96 4 */ blkcnt_t i_blocks; /* 100 4 */ short unsigned int i_bytes; /* 104 2 */ spinlock_t i_lock; /* 106 0 */ /* XXX 2 bytes hole, try to pack */ struct mutex i_mutex; /* 108 24 */ /* ---------- cacheline 2 boundary ---------- */ struct rw_semaphore i_alloc_sem; /* 132 12 */ struct inode_operations * i_op; /* 144 4 */ const struct file_operations * i_fop; /* 148 4 */ struct super_block * i_sb; /* 152 4 */ struct file_lock * i_flock; /* 156 4 */ struct address_space * i_mapping; /* 160 4 */ struct address_space i_data; /* 164 72 */ struct list_head i_devices; /* 236 8 */ union ; /* 244 4 */ int i_cindex; /* 248 4 */ __u32 i_generation; /* 252 4 */ long unsigned int i_dnotify_mask; /* 256 4 */ /* ---------- cacheline 4 boundary ---------- */ struct dnotify_struct * i_dnotify; /* 260 4 */ struct list_head inotify_watches; /* 264 8 */ struct mutex inotify_mutex; /* 272 24 */ long unsigned int i_state; /* 296 4 */ long unsigned int dirtied_when; /* 300 4 */ unsigned int i_flags; /* 304 4 */ atomic_t i_writecount; /* 308 4 */ void * i_private; /* 312 4 */ }; /* size: 316, sum members: 312, holes: 2, sum holes: 4 */ Has to be improved to show the other cacheline boundaries, that may be buried into a included struct or union. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-11-05 18:34:54 +01:00
" -s, --sizes show size of classes\n"
" -t, --nr_definitions show how many times struct "
"was defined\n"
" -D, --decl_exclude <prefix> exclude classes declared in "
"files with prefix\n"
" -x, --exclude <prefix> exclude prefixed classes\n"
" -X, --cu_exclude <prefix> exclude prefixed compilation "
"units\n"
" -a, --anon_include include anonymous classes\n"
" -A, --nested_anon_include include nested (inside "
"other structs)\n"
" anonymous classes\n"
" -V, --verbose be verbose\n");
}
int main(int argc, char *argv[])
{
int option, option_index;
struct cus *cus;
char *file_name;
char *class_name = NULL;
size_t cacheline_size = 0;
void (*formatter)(const struct structure *s) = class_formatter;
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
while ((option = getopt_long(argc, argv, "AaB:c:D:ehH:mnNpstVx:X:",
long_options, &option_index)) >= 0)
switch (option) {
[PAHOLE]: Print cacheline boundaries Cacheline size defaults to 32, sample output changing the default to 64 bytes: pahole --cacheline=64 ../../acme/OUTPUT/qemu/net-2.6/net/ipv4/tcp.o inode /* /pub/scm/linux/kernel/git/acme/net-2.6/include/linux/dcache.h:86 */ struct inode { struct hlist_node i_hash; /* 0 8 */ struct list_head i_list; /* 8 8 */ struct list_head i_sb_list; /* 16 8 */ struct list_head i_dentry; /* 24 8 */ long unsigned int i_ino; /* 32 4 */ atomic_t i_count; /* 36 4 */ umode_t i_mode; /* 40 2 */ /* XXX 2 bytes hole, try to pack */ unsigned int i_nlink; /* 44 4 */ uid_t i_uid; /* 48 4 */ gid_t i_gid; /* 52 4 */ dev_t i_rdev; /* 56 4 */ loff_t i_size; /* 60 8 */ struct timespec i_atime; /* 68 8 */ struct timespec i_mtime; /* 76 8 */ struct timespec i_ctime; /* 84 8 */ unsigned int i_blkbits; /* 92 4 */ long unsigned int i_version; /* 96 4 */ blkcnt_t i_blocks; /* 100 4 */ short unsigned int i_bytes; /* 104 2 */ spinlock_t i_lock; /* 106 0 */ /* XXX 2 bytes hole, try to pack */ struct mutex i_mutex; /* 108 24 */ /* ---------- cacheline 2 boundary ---------- */ struct rw_semaphore i_alloc_sem; /* 132 12 */ struct inode_operations * i_op; /* 144 4 */ const struct file_operations * i_fop; /* 148 4 */ struct super_block * i_sb; /* 152 4 */ struct file_lock * i_flock; /* 156 4 */ struct address_space * i_mapping; /* 160 4 */ struct address_space i_data; /* 164 72 */ struct list_head i_devices; /* 236 8 */ union ; /* 244 4 */ int i_cindex; /* 248 4 */ __u32 i_generation; /* 252 4 */ long unsigned int i_dnotify_mask; /* 256 4 */ /* ---------- cacheline 4 boundary ---------- */ struct dnotify_struct * i_dnotify; /* 260 4 */ struct list_head inotify_watches; /* 264 8 */ struct mutex inotify_mutex; /* 272 24 */ long unsigned int i_state; /* 296 4 */ long unsigned int dirtied_when; /* 300 4 */ unsigned int i_flags; /* 304 4 */ atomic_t i_writecount; /* 308 4 */ void * i_private; /* 312 4 */ }; /* size: 316, sum members: 312, holes: 2, sum holes: 4 */ Has to be improved to show the other cacheline boundaries, that may be buried into a included struct or union. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-11-05 18:34:54 +01:00
case 'c': cacheline_size = atoi(optarg); break;
case 'H': nr_holes = atoi(optarg); break;
case 'B': nr_bit_holes = atoi(optarg); break;
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
case 'e': expand_types = 1; break;
case 's': formatter = size_formatter; break;
case 'n': formatter = nr_members_formatter; break;
case 'N': formatter = class_name_len_formatter; break;
case 'm': formatter = nr_methods_formatter; break;
case 'p': show_packable = 1; break;
case 't': formatter = nr_definitions_formatter; break;
case 'a': class__include_anonymous = 1; break;
case 'A': class__include_nested_anonymous = 1; break;
case 'D': decl_exclude_prefix = optarg;
decl_exclude_prefix_len = strlen(decl_exclude_prefix);
break;
case 'x': class__exclude_prefix = optarg;
class__exclude_prefix_len = strlen(class__exclude_prefix);
break;
case 'X': cu__exclude_prefix = optarg;
cu__exclude_prefix_len = strlen(cu__exclude_prefix);
break;
case 'V': verbose = 1; break;
case 'h': usage(); return EXIT_SUCCESS;
default: usage(); return EXIT_FAILURE;
}
if (optind < argc) {
switch (argc - optind) {
case 1: file_name = argv[optind++]; break;
case 2: file_name = argv[optind++];
class_name = argv[optind++]; break;
default: usage(); return EXIT_FAILURE;
}
} else {
usage();
return EXIT_FAILURE;
}
dwarves__init(cacheline_size);
cus = cus__new(NULL, NULL);
if (cus == NULL) {
fputs("pahole: insufficient memory\n", stderr);
return EXIT_FAILURE;
}
if (cus__load(cus, file_name) != 0) {
fprintf(stderr, "pahole: couldn't load DWARF info from %s\n",
file_name);
return EXIT_FAILURE;
}
cus__for_each_cu(cus, cu_unique_iterator, NULL, cu__filter);
if (formatter == nr_methods_formatter)
cus__for_each_cu(cus, cu_nr_methods_iterator, NULL, cu__filter);
if (class_name != NULL) {
struct structure *s = structures__find(class_name);
if (s == NULL) {
printf("struct %s not found!\n", class_name);
return EXIT_FAILURE;
}
[PAHOLE]: Implement type expansion What is in a struct... [acme@filo pahole]$ pahole net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct work; /* 0 16 */ struct timer_list timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Oh, but what if we want to unfold all the structs? lo pahole]$ pahole --expand_types /home/acme/git/OUTPUT/qemu/linux-2.6/net/ipv6/tcp_ipv6.o delayed_work /* <2bc9> /home/acme/git/linux-2.6/include/linux/workqueue.h:37 */ struct delayed_work { struct work_struct { atomic_long_t data; /* 0 4 */ struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 4 8 */ work_func_t func; /* 12 4 */ } work; /* 0 16 */ struct timer_list { struct list_head { struct list_head * next; /* 0 4 */ struct list_head * prev; /* 4 4 */ } entry; /* 0 8 */ long unsigned int expires; /* 8 4 */ void (*function)(long unsigned int); /* 12 4 */ long unsigned int data; /* 16 4 */ struct tvec_t_base_s * base; /* 20 4 */ } timer; /* 16 24 */ }; /* size: 40, cachelines: 1 */ /* last cacheline: 40 bytes */ [acme@filo pahole]$ Quick hack, as we already had all the needed infrastructure due to anonymous struct printing inside structs/unions, now for the curious, if you have the kernel-debuginfo package installed in your FC6 machine: [acme@filo pahole]$ pahole --expand_types /usr/lib/debug/lib/modules/2.6.19-1.2895.fc6/kernel/net/ipv6/ipv6.ko.debug tcp6_sock Try struct task_struct too 8-) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-01-29 16:12:23 +01:00
tag__print(class__tag(s->class), s->cu, NULL, NULL,
expand_types);
} else
print_classes(formatter);
return EXIT_SUCCESS;
}