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Date: Mon, 22 May 2017 21:19:46 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Milian Wolff <milian.wolff@...b.com>
Cc: Linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
Arnaldo Carvalho de Melo <acme@...hat.com>,
David Ahern <dsahern@...il.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Yao Jin <yao.jin@...ux.intel.com>, kernel-team@....com
Subject: Re: [PATCH 3/7] perf report: create real callchain entries for
inlined frames
On Thu, May 18, 2017 at 09:34:07PM +0200, Milian Wolff wrote:
> +
> + if (strcmp(funcname, base_sym->name) == 0) {
> + // reuse the real, existing symbol
I don't know whether it's required by coding style guide but please
use C-style block comment if possible (especially for multiline comments).
> + inline_sym = base_sym;
> + } else {
> + // create a fake symbol for the inline frame
> + inline_sym = symbol__new(base_sym ? base_sym->start : 0,
> + base_sym ? base_sym->end : 0,
> + base_sym ? base_sym->binding : 0,
> + funcname);
> + if (inline_sym)
> + inline_sym->inlined = 1;
> + }
> +
> + free(demangled);
> +
> + return inline_sym;
> +}
> +
> static int inline_list__append_dso_a2l(struct dso *dso,
> - struct inline_node *node)
> + struct inline_node *node,
> + struct symbol *sym)
> {
> struct a2l_data *a2l = dso->a2l;
> - char *funcname = a2l->funcname ? strdup(a2l->funcname) : NULL;
> char *filename = a2l->filename ? strdup(a2l->filename) : NULL;
> + struct symbol *inline_sym = new_inline_sym(dso, sym, a2l->funcname);
>
> - return inline_list__append(filename, funcname, a2l->line, node, dso);
> + return inline_list__append(inline_sym, filename, a2l->line, node);
> }
>
> static int addr2line(const char *dso_name, u64 addr,
> char **file, unsigned int *line, struct dso *dso,
> - bool unwind_inlines, struct inline_node *node)
> + bool unwind_inlines, struct inline_node *node,
> + struct symbol *sym)
> {
> int ret = 0;
> struct a2l_data *a2l = dso->a2l;
> @@ -241,7 +264,7 @@ static int addr2line(const char *dso_name, u64 addr,
> if (unwind_inlines) {
> int cnt = 0;
>
> - if (node && inline_list__append_dso_a2l(dso, node))
> + if (node && inline_list__append_dso_a2l(dso, node, sym))
> return 0;
>
> while (bfd_find_inliner_info(a2l->abfd, &a2l->filename,
> @@ -249,7 +272,7 @@ static int addr2line(const char *dso_name, u64 addr,
> cnt++ < MAX_INLINE_NEST) {
>
> if (node != NULL) {
> - if (inline_list__append_dso_a2l(dso, node))
> + if (inline_list__append_dso_a2l(dso, node, sym))
> return 0;
> // found at least one inline frame
> ret = 1;
> @@ -281,7 +304,7 @@ void dso__free_a2l(struct dso *dso)
> }
>
> static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
> - struct dso *dso)
> + struct dso *dso, struct symbol *sym)
> {
> struct inline_node *node;
>
> @@ -294,7 +317,7 @@ static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
> INIT_LIST_HEAD(&node->val);
> node->addr = addr;
>
> - if (!addr2line(dso_name, addr, NULL, NULL, dso, TRUE, node))
> + if (!addr2line(dso_name, addr, NULL, NULL, dso, TRUE, node, sym))
> goto out_free_inline_node;
>
> if (list_empty(&node->val))
> @@ -334,7 +357,8 @@ static int addr2line(const char *dso_name, u64 addr,
> char **file, unsigned int *line_nr,
> struct dso *dso __maybe_unused,
> bool unwind_inlines __maybe_unused,
> - struct inline_node *node __maybe_unused)
> + struct inline_node *node __maybe_unused,
> + struct symbol *sym __maybe_unused)
> {
> FILE *fp;
> char cmd[PATH_MAX];
> @@ -374,7 +398,7 @@ void dso__free_a2l(struct dso *dso __maybe_unused)
> }
>
> static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
> - struct dso *dso __maybe_unused)
> + struct dso *dso __maybe_unused, struct symbol *sym)
> {
> FILE *fp;
> char cmd[PATH_MAX];
> @@ -407,8 +431,7 @@ static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
> goto out;
> }
>
> - if (inline_list__append(filename, NULL, line_nr, node,
> - NULL) != 0)
> + if (inline_list__append(sym, filename, line_nr, node) != 0)
> goto out;
>
> filename = NULL;
> @@ -448,7 +471,8 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
> if (dso_name == NULL)
> goto out;
>
> - if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines, NULL))
> + if (!addr2line(dso_name, addr, &file, &line, dso,
> + unwind_inlines, NULL, sym))
> goto out;
>
> if (asprintf(&srcline, "%s:%u",
> @@ -494,7 +518,8 @@ char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
> return __get_srcline(dso, addr, sym, show_sym, show_addr, false);
> }
>
> -struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr)
> +struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr,
> + struct symbol *sym)
> {
> const char *dso_name;
>
> @@ -502,7 +527,7 @@ struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr)
> if (dso_name == NULL)
> return NULL;
>
> - return addr2inlines(dso_name, addr, dso);
> + return addr2inlines(dso_name, addr, dso, sym);
> }
>
> void inline_node__delete(struct inline_node *node)
> @@ -512,9 +537,62 @@ void inline_node__delete(struct inline_node *node)
> list_for_each_entry_safe(ilist, tmp, &node->val, list) {
> list_del_init(&ilist->list);
> zfree(&ilist->filename);
> - zfree(&ilist->funcname);
> + // only the inlined symbols are owned by the list
> + if (ilist->symbol && ilist->symbol->inlined)
> + symbol__delete(ilist->symbol);
> free(ilist);
> }
>
> free(node);
> }
> +
> +void inlines__tree_insert(struct rb_root *tree, struct inline_node *inlines)
> +{
> + struct rb_node **p = &tree->rb_node;
> + struct rb_node *parent = NULL;
> + const u64 addr = inlines->addr;
> + struct inline_node *i;
> +
> + while (*p != NULL) {
> + parent = *p;
> + i = rb_entry(parent, struct inline_node, rb_node);
> + if (addr < i->addr)
> + p = &(*p)->rb_left;
> + else
> + p = &(*p)->rb_right;
> + }
> + rb_link_node(&inlines->rb_node, parent, p);
> + rb_insert_color(&inlines->rb_node, tree);
> +}
> +
> +struct inline_node *inlines__tree_find(struct rb_root *tree, u64 addr)
> +{
> + struct rb_node *n = tree->rb_node;
> +
> + while (n) {
> + struct inline_node *i = rb_entry(n, struct inline_node,
> + rb_node);
> +
> + if (addr < i->addr)
> + n = n->rb_left;
> + else if (addr > i->addr)
> + n = n->rb_right;
> + else
> + return i;
> + }
> +
> + return NULL;
> +}
> +
> +void inlines__tree_delete(struct rb_root *tree)
> +{
> + struct inline_node *pos;
> + struct rb_node *next = rb_first(tree);
> +
> + while (next) {
> + pos = rb_entry(next, struct inline_node, rb_node);
> + next = rb_next(&pos->rb_node);
> + rb_erase(&pos->rb_node, tree);
> + inline_node__delete(pos);
> + }
> +}
> diff --git a/tools/perf/util/srcline.h b/tools/perf/util/srcline.h
> index 7b52ba88676e..ad9726987b80 100644
> --- a/tools/perf/util/srcline.h
> +++ b/tools/perf/util/srcline.h
> @@ -2,6 +2,7 @@
> #define PERF_SRCLINE_H
>
> #include <linux/list.h>
> +#include <linux/rbtree.h>
> #include <linux/types.h>
>
> struct dso;
> @@ -17,8 +18,8 @@ void free_srcline(char *srcline);
> #define SRCLINE_UNKNOWN ((char *) "??:0")
>
> struct inline_list {
> + struct symbol *symbol;
> char *filename;
> - char *funcname;
> unsigned int line_nr;
> struct list_head list;
> };
> @@ -26,9 +27,20 @@ struct inline_list {
> struct inline_node {
> u64 addr;
> struct list_head val;
> + struct rb_node rb_node;
> };
>
> -struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr);
> +// parse inlined frames for the given address
> +struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr,
> + struct symbol *sym);
> +// free resources associated to the inline node list
> void inline_node__delete(struct inline_node *node);
>
> +// insert the inline node list into the DSO, which will take ownership
> +void inlines__tree_insert(struct rb_root *tree, struct inline_node *inlines);
> +// find previously inserted inline node list
> +struct inline_node *inlines__tree_find(struct rb_root *tree, u64 addr);
> +// delete all nodes within the tree of inline_node s
> +void inlines__tree_delete(struct rb_root *tree);
> +
> #endif /* PERF_SRCLINE_H */
> diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
> index f0b08810d7fa..b358570ce615 100644
> --- a/tools/perf/util/symbol.h
> +++ b/tools/perf/util/symbol.h
> @@ -59,6 +59,7 @@ struct symbol {
> u8 binding;
> u8 idle:1;
> u8 ignore:1;
> + u8 inlined:1;
> u8 arch_sym;
> char name[0];
> };
> --
> 2.13.0
>
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