perf tools: Rewrite and improve support for kernel modules

Representing modules as struct map entries, backed by a DSO, etc,
using /proc/modules to find where the module is loaded.

DSOs now can have a short and long name, so that in verbose mode we
can show exactly which .ko or vmlinux image was used.

As kernel modules now are a DSO separate from the kernel, we can
ask for just the hits for a particular set of kernel modules, just
like we can do with shared libraries:

[root@doppio linux-2.6-tip]# perf report -n --vmlinux
/home/acme/git/build/tip-recvmmsg/vmlinux --modules --dsos \[drm\] | head -15
    84.58%      13266             Xorg  [k] drm_clflush_pages
     4.02%        630             Xorg  [k] trace_kmalloc.clone.0
     3.95%        619             Xorg  [k] drm_ioctl
     2.07%        324             Xorg  [k] drm_addbufs
     1.68%        263             Xorg  [k] drm_gem_close_ioctl
     0.77%        120             Xorg  [k] drm_setmaster_ioctl
     0.70%        110             Xorg  [k] drm_lastclose
     0.68%        106             Xorg  [k] drm_open
     0.54%         85             Xorg  [k] drm_mm_search_free
[root@doppio linux-2.6-tip]#

Specifying --dsos /lib/modules/2.6.31-tip/kernel/drivers/gpu/drm/drm.ko
would have the same effect. Allowing specifying just 'drm.ko' is left
for another patch.

Processing kallsyms so that per kernel module struct map are
instantiated was also left for another patch. That will allow
removing the module name from each of its symbols.

struct symbol was reduced by removing the ->module backpointer and
moving it (well now the map) to struct symbol_entry in perf top,
that is its only user right now.

The total linecount went down by ~500 lines.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/Makefile

@@ -336,7 +336,6 @@ LIB_H += util/strlist.h
 LIB_H += util/run-command.h
 LIB_H += util/sigchain.h
 LIB_H += util/symbol.h
-LIB_H += util/module.h
 LIB_H += util/color.h
 LIB_H += util/values.h
 LIB_H += util/sort.h
@@ -364,7 +363,6 @@ LIB_OBJS += util/usage.o
 LIB_OBJS += util/wrapper.o
 LIB_OBJS += util/sigchain.o
 LIB_OBJS += util/symbol.o
-LIB_OBJS += util/module.o
 LIB_OBJS += util/color.o
 LIB_OBJS += util/pager.o
 LIB_OBJS += util/header.o

tools/perf/builtin-annotate.c

@@ -63,6 +63,7 @@ static void hist_hit(struct hist_entry *he, u64 ip)
 		return;
 
 	sym_size = sym->end - sym->start;
+	ip = he->map->map_ip(he->map, ip);
 	offset = ip - sym->start;
 
 	if (offset >= sym_size)
@@ -80,7 +81,7 @@ static void hist_hit(struct hist_entry *he, u64 ip)
 }
 
 static int
-hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
+hist_entry__add(struct thread *thread, struct map *map,
 		struct symbol *sym, u64 ip, char level)
 {
 	struct rb_node **p = &hist.rb_node;
@@ -89,7 +90,6 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
 	struct hist_entry entry = {
 		.thread	= thread,
 		.map	= map,
-		.dso	= dso,
 		.sym	= sym,
 		.ip	= ip,
 		.level	= level,
@@ -130,10 +130,10 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 {
 	char level;
 	int show = 0;
-	struct dso *dso = NULL;
 	struct thread *thread;
 	u64 ip = event->ip.ip;
 	struct map *map = NULL;
+	struct symbol *sym = NULL;
 
 	thread = threads__findnew(event->ip.pid, &threads, &last_match);
 
@@ -155,32 +155,35 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 	if (event->header.misc & PERF_RECORD_MISC_KERNEL) {
 		show = SHOW_KERNEL;
 		level = 'k';
-
-		dso = kernel_dso;
-
-		dump_printf(" ...... dso: %s\n", dso->name);
-
+		sym = kernel_maps__find_symbol(ip, &map);
+		dump_printf(" ...... dso: %s\n",
+			    map ? map->dso->long_name : "<not found>");
 	} else if (event->header.misc & PERF_RECORD_MISC_USER) {
-
 		show = SHOW_USER;
 		level = '.';
-
 		map = thread__find_map(thread, ip);
 		if (map != NULL) {
+got_map:
 			ip = map->map_ip(map, ip);
-			dso = map->dso;
+			sym = map->dso->find_symbol(map->dso, ip);
 		} else {
 			/*
 			 * If this is outside of all known maps,
 			 * and is a negative address, try to look it
 			 * up in the kernel dso, as it might be a
-			 * vsyscall (which executes in user-mode):
+			 * vsyscall or vdso (which executes in user-mode).
+			 *
+			 * XXX This is nasty, we should have a symbol list in
+			 * the "[vdso]" dso, but for now lets use the old
+			 * trick of looking in the whole kernel symbol list.
 			 */
-			if ((long long)ip < 0)
-				dso = kernel_dso;
+			if ((long long)ip < 0) {
+				map = kernel_map;
+				goto got_map;
+			}
 		}
-		dump_printf(" ...... dso: %s\n", dso ? dso->name : "<not found>");
-
+		dump_printf(" ...... dso: %s\n",
+			    map ? map->dso->long_name : "<not found>");
 	} else {
 		show = SHOW_HV;
 		level = 'H';
@@ -188,12 +191,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 	}
 
 	if (show & show_mask) {
-		struct symbol *sym = NULL;
-
-		if (dso)
-			sym = dso->find_symbol(dso, ip);
-
-		if (hist_entry__add(thread, map, dso, sym, ip, level)) {
+		if (hist_entry__add(thread, map, sym, ip, level)) {
 			fprintf(stderr,
 		"problem incrementing symbol count, skipping event\n");
 			return -1;
@@ -313,7 +311,7 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
 }
 
 static int
-parse_line(FILE *file, struct symbol *sym, u64 start, u64 len)
+parse_line(FILE *file, struct symbol *sym, u64 len)
 {
 	char *line = NULL, *tmp, *tmp2;
 	static const char *prev_line;
@@ -363,7 +361,7 @@ parse_line(FILE *file, struct symbol *sym, u64 start, u64 len)
 		const char *color;
 		struct sym_ext *sym_ext = sym->priv;
 
-		offset = line_ip - start;
+		offset = line_ip - sym->start;
 		if (offset < len)
 			hits = sym->hist[offset];
 
@@ -442,7 +440,7 @@ static void free_source_line(struct symbol *sym, int len)
 
 /* Get the filename:line for the colored entries */
 static void
-get_source_line(struct symbol *sym, u64 start, int len, const char *filename)
+get_source_line(struct symbol *sym, int len, const char *filename)
 {
 	int i;
 	char cmd[PATH_MAX * 2];
@@ -467,7 +465,7 @@ get_source_line(struct symbol *sym, u64 start, int len, const char *filename)
 		if (sym_ext[i].percent <= 0.5)
 			continue;
 
-		offset = start + i;
+		offset = sym->start + i;
 		sprintf(cmd, "addr2line -e %s %016llx", filename, offset);
 		fp = popen(cmd, "r");
 		if (!fp)
@@ -519,31 +517,23 @@ static void print_summary(const char *filename)
 
 static void annotate_sym(struct dso *dso, struct symbol *sym)
 {
-	const char *filename = dso->name, *d_filename;
-	u64 start, end, len;
+	const char *filename = dso->long_name, *d_filename;
+	u64 len;
 	char command[PATH_MAX*2];
 	FILE *file;
 
 	if (!filename)
 		return;
-	if (sym->module)
-		filename = sym->module->path;
-	else if (dso == kernel_dso)
-		filename = vmlinux_name;
-
-	start = sym->obj_start;
-	if (!start)
-		start = sym->start;
+
 	if (full_paths)
 		d_filename = filename;
 	else
 		d_filename = basename(filename);
 
-	end = start + sym->end - sym->start + 1;
 	len = sym->end - sym->start;
 
 	if (print_line) {
-		get_source_line(sym, start, len, filename);
+		get_source_line(sym, len, filename);
 		print_summary(filename);
 	}
 
@@ -552,10 +542,11 @@ static void annotate_sym(struct dso *dso, struct symbol *sym)
 	printf("------------------------------------------------\n");
 
 	if (verbose >= 2)
-		printf("annotating [%p] %30s : [%p] %30s\n", dso, dso->name, sym, sym->name);
+		printf("annotating [%p] %30s : [%p] %30s\n",
+		       dso, dso->long_name, sym, sym->name);
 
 	sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s|grep -v %s",
-			(u64)start, (u64)end, filename, filename);
+		sym->start, sym->end, filename, filename);
 
 	if (verbose >= 3)
 		printf("doing: %s\n", command);
@@ -565,7 +556,7 @@ static void annotate_sym(struct dso *dso, struct symbol *sym)
 		return;
 
 	while (!feof(file)) {
-		if (parse_line(file, sym, start, len) < 0)
+		if (parse_line(file, sym, len) < 0)
 			break;
 	}
 

tools/perf/builtin-report.c

@@ -349,22 +349,17 @@ static int thread__set_comm_adjust(struct thread *self, const char *comm)
 
 
 static struct symbol *
-resolve_symbol(struct thread *thread, struct map **mapp,
-	       struct dso **dsop, u64 *ipp)
+resolve_symbol(struct thread *thread, struct map **mapp, u64 *ipp)
 {
-	struct dso *dso = dsop ? *dsop : NULL;
 	struct map *map = mapp ? *mapp : NULL;
 	u64 ip = *ipp;
 
-	if (!thread)
-		return NULL;
-
-	if (dso)
-		goto got_dso;
-
 	if (map)
 		goto got_map;
 
+	if (!thread)
+		return NULL;
+
 	map = thread__find_map(thread, ip);
 	if (map != NULL) {
 		/*
@@ -379,29 +374,29 @@ resolve_symbol(struct thread *thread, struct map **mapp,
 			*mapp = map;
 got_map:
 		ip = map->map_ip(map, ip);
-
-		dso = map->dso;
 	} else {
 		/*
 		 * If this is outside of all known maps,
 		 * and is a negative address, try to look it
 		 * up in the kernel dso, as it might be a
-		 * vsyscall (which executes in user-mode):
+		 * vsyscall or vdso (which executes in user-mode).
+		 *
+		 * XXX This is nasty, we should have a symbol list in
+		 * the "[vdso]" dso, but for now lets use the old
+		 * trick of looking in the whole kernel symbol list.
 		 */
-		if ((long long)ip < 0)
-		dso = kernel_dso;
+		if ((long long)ip < 0) {
+			map = kernel_map;
+			if (mapp)
+				*mapp = map;
+		}
 	}
-	dump_printf(" ...... dso: %s\n", dso ? dso->name : "<not found>");
+	dump_printf(" ...... dso: %s\n",
+		    map ? map->dso->long_name : "<not found>");
 	dump_printf(" ...... map: %Lx -> %Lx\n", *ipp, ip);
 	*ipp  = ip;
 
-	if (dsop)
-		*dsop = dso;
-
-	if (!dso)
-		return NULL;
-got_dso:
-	return dso->find_symbol(dso, ip);
+	return map ? map->dso->find_symbol(map->dso, ip) : NULL;
 }
 
 static int call__match(struct symbol *sym)
@@ -413,7 +408,7 @@ static int call__match(struct symbol *sym)
 }
 
 static struct symbol **
-resolve_callchain(struct thread *thread, struct map *map __used,
+resolve_callchain(struct thread *thread, struct map *map,
 		    struct ip_callchain *chain, struct hist_entry *entry)
 {
 	u64 context = PERF_CONTEXT_MAX;
@@ -430,8 +425,7 @@ resolve_callchain(struct thread *thread, struct map *map __used,
 
 	for (i = 0; i < chain->nr; i++) {
 		u64 ip = chain->ips[i];
-		struct dso *dso = NULL;
-		struct symbol *sym;
+		struct symbol *sym = NULL;
 
 		if (ip >= PERF_CONTEXT_MAX) {
 			context = ip;
@@ -440,17 +434,15 @@ resolve_callchain(struct thread *thread, struct map *map __used,
 
 		switch (context) {
 		case PERF_CONTEXT_HV:
-			dso = hypervisor_dso;
 			break;
 		case PERF_CONTEXT_KERNEL:
-			dso = kernel_dso;
+			sym = kernel_maps__find_symbol(ip, &map);
 			break;
 		default:
+			sym = resolve_symbol(thread, &map, &ip);
 			break;
 		}
 
-		sym = resolve_symbol(thread, NULL, &dso, &ip);
-
 		if (sym) {
 			if (sort__has_parent && call__match(sym) &&
 			    !entry->parent)
@@ -469,7 +461,7 @@ resolve_callchain(struct thread *thread, struct map *map __used,
  */
 
 static int
-hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
+hist_entry__add(struct thread *thread, struct map *map,
 		struct symbol *sym, u64 ip, struct ip_callchain *chain,
 		char level, u64 count)
 {
@@ -480,7 +472,6 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
 	struct hist_entry entry = {
 		.thread	= thread,
 		.map	= map,
-		.dso	= dso,
 		.sym	= sym,
 		.ip	= ip,
 		.level	= level,
@@ -641,7 +632,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 {
 	char level;
 	int show = 0;
-	struct dso *dso = NULL;
+	struct symbol *sym = NULL;
 	struct thread *thread;
 	u64 ip = event->ip.ip;
 	u64 period = 1;
@@ -700,35 +691,35 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
 		show = SHOW_KERNEL;
 		level = 'k';
 
-		dso = kernel_dso;
-
-		dump_printf(" ...... dso: %s\n", dso->name);
-
+		sym = kernel_maps__find_symbol(ip, &map);
+		dump_printf(" ...... dso: %s\n",
+			    map ? map->dso->long_name : "<not found>");
 	} else if (cpumode == PERF_RECORD_MISC_USER) {
 
 		show = SHOW_USER;
 		level = '.';
+		sym = resolve_symbol(thread, &map, &ip);
 
 	} else {
 		show = SHOW_HV;
 		level = 'H';
 
-		dso = hypervisor_dso;
-
 		dump_printf(" ...... dso: [hypervisor]\n");
 	}
 
 	if (show & show_mask) {
-		struct symbol *sym = resolve_symbol(thread, &map, &dso, &ip);
-
-		if (dso_list && (!dso || !dso->name ||
-				 !strlist__has_entry(dso_list, dso->name)))
+		if (dso_list &&
+		    (!map || !map->dso ||
+		     !(strlist__has_entry(dso_list, map->dso->short_name) ||
+		       (map->dso->short_name != map->dso->long_name &&
+			strlist__has_entry(dso_list, map->dso->long_name)))))
 			return 0;
 
-		if (sym_list && (!sym || !strlist__has_entry(sym_list, sym->name)))
+		if (sym_list && sym && !strlist__has_entry(sym_list, sym->name))
 			return 0;
 
-		if (hist_entry__add(thread, map, dso, sym, ip, chain, level, period)) {
+		if (hist_entry__add(thread, map, sym, ip,
+				    chain, level, period)) {
 			eprintf("problem incrementing symbol count, skipping event\n");
 			return -1;
 		}

tools/perf/builtin-top.c

@@ -22,6 +22,7 @@
 
 #include "util/symbol.h"
 #include "util/color.h"
+#include "util/thread.h"
 #include "util/util.h"
 #include <linux/rbtree.h>
 #include "util/parse-options.h"
@@ -103,6 +104,7 @@ struct sym_entry {
 	unsigned long		snap_count;
 	double			weight;
 	int			skip;
+	struct map		*map;
 	struct source_line	*source;
 	struct source_line	*lines;
 	struct source_line	**lines_tail;
@@ -116,12 +118,11 @@ struct sym_entry {
 static void parse_source(struct sym_entry *syme)
 {
 	struct symbol *sym;
-	struct module *module;
-	struct section *section = NULL;
+	struct map *map;
 	FILE *file;
 	char command[PATH_MAX*2];
-	const char *path = vmlinux_name;
-	u64 start, end, len;
+	const char *path;
+	u64 len;
 
 	if (!syme)
 		return;
@@ -132,27 +133,15 @@ static void parse_source(struct sym_entry *syme)
 	}
 
 	sym = (struct symbol *)(syme + 1);
-	module = sym->module;
+	map = syme->map;
+	path = map->dso->long_name;
 
-	if (module)
-		path = module->path;
-	if (!path)
-		return;
-
-	start = sym->obj_start;
-	if (!start)
-		start = sym->start;
-
-	if (module) {
-		section = module->sections->find_section(module->sections, ".text");
-		if (section)
-			start -= section->vma;
-	}
-
-	end = start + sym->end - sym->start + 1;
 	len = sym->end - sym->start;
 
-	sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s", start, end, path);
+	sprintf(command,
+		"objdump --start-address=0x%016Lx "
+			 "--stop-address=0x%016Lx -dS %s",
+		sym->start, sym->end, path);
 
 	file = popen(command, "r");
 	if (!file)
@@ -184,13 +173,11 @@ static void parse_source(struct sym_entry *syme)
 
 		if (strlen(src->line)>8 && src->line[8] == ':') {
 			src->eip = strtoull(src->line, NULL, 16);
-			if (section)
-				src->eip += section->vma;
+			src->eip += map->start;
 		}
 		if (strlen(src->line)>8 && src->line[16] == ':') {
 			src->eip = strtoull(src->line, NULL, 16);
-			if (section)
-				src->eip += section->vma;
+			src->eip += map->start;
 		}
 	}
 	pclose(file);
@@ -242,16 +229,9 @@ static void lookup_sym_source(struct sym_entry *syme)
 	struct symbol *symbol = (struct symbol *)(syme + 1);
 	struct source_line *line;
 	char pattern[PATH_MAX];
-	char *idx;
 
 	sprintf(pattern, "<%s>:", symbol->name);
 
-	if (symbol->module) {
-		idx = strstr(pattern, "\t");
-		if (idx)
-			*idx = 0;
-	}
-
 	pthread_mutex_lock(&syme->source_lock);
 	for (line = syme->lines; line; line = line->next) {
 		if (strstr(line->line, pattern)) {
@@ -513,8 +493,8 @@ static void print_sym_table(void)
 		if (verbose)
 			printf(" - %016llx", sym->start);
 		printf(" : %s", sym->name);
-		if (sym->module)
-			printf("\t[%s]", sym->module->name);
+		if (syme->map->dso->name[0] == '[')
+			printf(" \t%s", syme->map->dso->name);
 		printf("\n");
 	}
 }
@@ -784,7 +764,7 @@ static const char *skip_symbols[] = {
 	NULL
 };
 
-static int symbol_filter(struct dso *self, struct symbol *sym)
+static int symbol_filter(struct map *map, struct symbol *sym)
 {
 	struct sym_entry *syme;
 	const char *name = sym->name;
@@ -806,7 +786,8 @@ static int symbol_filter(struct dso *self, struct symbol *sym)
 	    strstr(name, "_text_end"))
 		return 1;
 
-	syme = dso__sym_priv(self, sym);
+	syme = dso__sym_priv(map->dso, sym);
+	syme->map = map;
 	pthread_mutex_init(&syme->source_lock, NULL);
 	if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
 		sym_filter_entry = syme;
@@ -825,22 +806,14 @@ static int parse_symbols(void)
 {
 	int use_modules = vmlinux_name ? 1 : 0;
 
-	kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
-	if (kernel_dso == NULL)
+	if (dsos__load_kernel(vmlinux_name, sizeof(struct sym_entry),
+			      symbol_filter, verbose, use_modules) <= 0)
 		return -1;
 
-	if (dso__load_kernel(kernel_dso, vmlinux_name, symbol_filter, verbose, use_modules) <= 0)
-		goto out_delete_dso;
-
 	if (dump_symtab)
-		dso__fprintf(kernel_dso, stderr);
+		dsos__fprintf(stderr);
 
 	return 0;
-
-out_delete_dso:
-	dso__delete(kernel_dso);
-	kernel_dso = NULL;
-	return -1;
 }
 
 /*
@@ -848,10 +821,11 @@ static int parse_symbols(void)
  */
 static void record_ip(u64 ip, int counter)
 {
-	struct symbol *sym = dso__find_symbol(kernel_dso, ip);
+	struct map *map;
+	struct symbol *sym = kernel_maps__find_symbol(ip, &map);
 
 	if (sym != NULL) {
-		struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
+		struct sym_entry *syme = dso__sym_priv(map->dso, sym);
 
 		if (!syme->skip) {
 			syme->count[counter]++;

tools/perf/util/event.h

@@ -3,6 +3,7 @@
 
 #include "../perf.h"
 #include "util.h"
+#include <linux/list.h>
 #include <linux/rbtree.h>
 
 enum {
@@ -79,7 +80,10 @@ typedef union event_union {
 } event_t;
 
 struct map {
-	struct rb_node		rb_node;
+	union {
+		struct rb_node	rb_node;
+		struct list_head node;
+	};
 	u64			start;
 	u64			end;
 	u64			pgoff;

tools/perf/util/module.h

-#ifndef __PERF_MODULE_
-#define __PERF_MODULE_ 1
-
-#include <linux/types.h>
-#include "../types.h"
-#include <linux/list.h>
-#include <linux/rbtree.h>
-
-struct section {
-	struct rb_node	rb_node;
-	u64		hash;
-	u64		vma;
-	char		*name;
-	char		*path;
-};
-
-struct sec_dso {
-	struct list_head node;
-	struct rb_root	 secs;
-	struct section    *(*find_section)(struct sec_dso *, const char *name);
-	char		 name[0];
-};
-
-struct module {
-	struct rb_node	rb_node;
-	u64		hash;
-	char		*name;
-	char		*path;
-	struct sec_dso	*sections;
-	int		active;
-};
-
-struct mod_dso {
-	struct list_head node;
-	struct rb_root	 mods;
-	struct module    *(*find_module)(struct mod_dso *, const char *name);
-	char		 name[0];
-};
-
-struct sec_dso *sec_dso__new_dso(const char *name);
-void sec_dso__delete_sections(struct sec_dso *self);
-void sec_dso__delete_self(struct sec_dso *self);
-size_t sec_dso__fprintf(struct sec_dso *self, FILE *fp);
-struct section *sec_dso__find_section(struct sec_dso *self, const char *name);
-
-struct mod_dso *mod_dso__new_dso(const char *name);
-void mod_dso__delete_modules(struct mod_dso *self);
-void mod_dso__delete_self(struct mod_dso *self);
-size_t mod_dso__fprintf(struct mod_dso *self, FILE *fp);
-struct module *mod_dso__find_module(struct mod_dso *self, const char *name);
-int mod_dso__load_modules(struct mod_dso *dso);
-
-#endif /* __PERF_MODULE_ */

tools/perf/util/sort.c

@@ -129,20 +129,32 @@ sort__comm_print(FILE *fp, struct hist_entry *self, unsigned int width)
 int64_t
 sort__dso_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-	struct dso *dso_l = left->dso;
-	struct dso *dso_r = right->dso;
+	struct dso *dso_l = left->map ? left->map->dso : NULL;
+	struct dso *dso_r = right->map ? right->map->dso : NULL;
+	const char *dso_name_l, *dso_name_r;
 
 	if (!dso_l || !dso_r)
 		return cmp_null(dso_l, dso_r);
 
-	return strcmp(dso_l->name, dso_r->name);
+	if (verbose) {
+		dso_name_l = dso_l->long_name;
+		dso_name_r = dso_r->long_name;
+	} else {
+		dso_name_l = dso_l->short_name;
+		dso_name_r = dso_r->short_name;
+	}
+
+	return strcmp(dso_name_l, dso_name_r);
 }
 
 size_t
 sort__dso_print(FILE *fp, struct hist_entry *self, unsigned int width)
 {
-	if (self->dso)
-		return repsep_fprintf(fp, "%-*s", width, self->dso->name);
+	if (self->map && self->map->dso) {
+		const char *dso_name = !verbose ? self->map->dso->short_name :
+						  self->map->dso->long_name;
+		return repsep_fprintf(fp, "%-*s", width, dso_name);
+	}
 
 	return repsep_fprintf(fp, "%*llx", width, (u64)self->ip);
 }
@@ -169,20 +181,16 @@ sort__sym_print(FILE *fp, struct hist_entry *self, unsigned int width __used)
 {
 	size_t ret = 0;
 
-	if (verbose)
-		ret += repsep_fprintf(fp, "%#018llx %c ", (u64)self->ip,
-				      dso__symtab_origin(self->dso));
+	if (verbose) {
+		char o = self->map ? dso__symtab_origin(self->map->dso) : '!';
+		ret += repsep_fprintf(fp, "%#018llx %c ", (u64)self->ip, o);
+	}
 
 	ret += repsep_fprintf(fp, "[%c] ", self->level);
-	if (self->sym) {
+	if (self->sym)
 		ret += repsep_fprintf(fp, "%s", self->sym->name);
-
-		if (self->sym->module)
-			ret += repsep_fprintf(fp, "\t[%s]",
-					     self->sym->module->name);
-	} else {
+	else
 		ret += repsep_fprintf(fp, "%#016llx", (u64)self->ip);
-	}
 
 	return ret;
 }

tools/perf/util/sort.h

@@ -42,18 +42,15 @@ extern unsigned int threads__col_width;
 
 struct hist_entry {
 	struct rb_node		rb_node;
-
+	u64			count;
 	struct thread		*thread;
 	struct map		*map;
-	struct dso		*dso;
 	struct symbol		*sym;
-	struct symbol		*parent;
 	u64			ip;
 	char			level;
+	struct symbol		*parent;
 	struct callchain_node	callchain;
 	struct rb_root		sorted_chain;
-
-	u64			count;
 };
 
 /*

tools/perf/util/symbol.h

@@ -5,7 +5,6 @@
 #include "types.h"
 #include <linux/list.h>
 #include <linux/rbtree.h>
-#include "module.h"
 #include "event.h"
 
 #ifdef HAVE_CPLUS_DEMANGLE
@@ -36,10 +35,8 @@ struct symbol {
 	struct rb_node	rb_node;
 	u64		start;
 	u64		end;
-	u64		obj_start;
 	u64		hist_sum;
 	u64		*hist;
-	struct module	*module;
 	void		*priv;
 	char		name[0];
 };
@@ -52,12 +49,14 @@ struct dso {
 	unsigned char	 adjust_symbols;
 	unsigned char	 slen_calculated;
 	unsigned char	 origin;
+	const char	 *short_name;
+	char	 	 *long_name;
 	char		 name[0];
 };
 
 extern const char *sym_hist_filter;
 
-typedef int (*symbol_filter_t)(struct dso *self, struct symbol *sym);
+typedef int (*symbol_filter_t)(struct map *map, struct symbol *sym);
 
 struct dso *dso__new(const char *name, unsigned int sym_priv_size);
 void dso__delete(struct dso *self);
@@ -69,10 +68,12 @@ static inline void *dso__sym_priv(struct dso *self, struct symbol *sym)
 
 struct symbol *dso__find_symbol(struct dso *self, u64 ip);
 
-int dso__load_kernel(struct dso *self, const char *vmlinux,
-		     symbol_filter_t filter, int verbose, int modules);
-int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose);
-int dso__load(struct dso *self, symbol_filter_t filter, int verbose);
+int dsos__load_kernel(const char *vmlinux, unsigned int sym_priv_size,
+		      symbol_filter_t filter, int verbose, int modules);
+int dsos__load_modules(unsigned int sym_priv_size, symbol_filter_t filter,
+		       int verbose);
+int dso__load(struct dso *self, struct map *map, symbol_filter_t filter,
+	      int verbose);
 struct dso *dsos__findnew(const char *name);
 void dsos__fprintf(FILE *fp);
 
@@ -84,9 +85,8 @@ int load_kernel(void);
 void symbol__init(void);
 
 extern struct list_head dsos;
-extern struct dso *kernel_dso;
+extern struct map *kernel_map;
 extern struct dso *vdso;
-extern struct dso *hypervisor_dso;
 extern const char *vmlinux_name;
 extern int   modules;
 #endif /* __PERF_SYMBOL */

tools/perf/util/thread.c

@@ -16,6 +16,7 @@ static struct thread *thread__new(pid_t pid)
 		if (self->comm)
 			snprintf(self->comm, 32, ":%d", self->pid);
 		self->maps = RB_ROOT;
+		INIT_LIST_HEAD(&self->removed_maps);
 	}
 
 	return self;
@@ -32,13 +33,20 @@ int thread__set_comm(struct thread *self, const char *comm)
 static size_t thread__fprintf(struct thread *self, FILE *fp)
 {
 	struct rb_node *nd;
-	size_t ret = fprintf(fp, "Thread %d %s\n", self->pid, self->comm);
+	struct map *pos;
+	size_t ret = fprintf(fp, "Thread %d %s\nCurrent maps:\n",
+			     self->pid, self->comm);
 
 	for (nd = rb_first(&self->maps); nd; nd = rb_next(nd)) {
-		struct map *pos = rb_entry(nd, struct map, rb_node);
+		pos = rb_entry(nd, struct map, rb_node);
 		ret += map__fprintf(pos, fp);
 	}
 
+	ret = fprintf(fp, "Removed maps:\n");
+
+	list_for_each_entry(pos, &self->removed_maps, node)
+		ret += map__fprintf(pos, fp);
+
 	return ret;
 }
 
@@ -112,21 +120,13 @@ static void thread__remove_overlappings(struct thread *self, struct map *map)
 			map__fprintf(pos, stdout);
 		}
 
-		if (map->start <= pos->start && map->end > pos->start)
-			pos->start = map->end;
-
-		if (map->end >= pos->end && map->start < pos->end)
-			pos->end = map->start;
-
-		if (verbose >= 2) {
-			printf("after collision:\n");
-			map__fprintf(pos, stdout);
-		}
-
-		if (pos->start >= pos->end) {
-			rb_erase(&pos->rb_node, &self->maps);
-			free(pos);
-		}
+		rb_erase(&pos->rb_node, &self->maps);
+		/*
+		 * We may have references to this map, for instance in some
+		 * hist_entry instances, so just move them to a separate
+		 * list.
+		 */
+		list_add_tail(&pos->node, &self->removed_maps);
 	}
 }
 

tools/perf/util/thread.h

@@ -8,6 +8,7 @@
 struct thread {
 	struct rb_node		rb_node;
 	struct rb_root		maps;
+	struct list_head	removed_maps;
 	pid_t			pid;
 	char			shortname[3];
 	char			*comm;
@@ -25,6 +26,9 @@ size_t threads__fprintf(FILE *fp, struct rb_root *threads);
 void maps__insert(struct rb_root *maps, struct map *map);
 struct map *maps__find(struct rb_root *maps, u64 ip);
 
+struct symbol *kernel_maps__find_symbol(const u64 ip, struct map **mapp);
+struct map *kernel_maps__find_by_dso_name(const char *name);
+
 static inline struct map *thread__find_map(struct thread *self, u64 ip)
 {
 	return self ? maps__find(&self->maps, ip) : NULL;