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Date:   Thu, 5 Oct 2017 12:35:29 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Milian Wolff <milian.wolff@...b.com>
Cc:     acme@...nel.org, jolsa@...nel.org,
        Jin Yao <yao.jin@...ux.intel.com>,
        Linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>, kernel-team@....com
Subject: Re: [PATCH v4 05/15] perf report: create real callchain entries for
 inlined frames

On Sun, Oct 01, 2017 at 04:30:50PM +0200, Milian Wolff wrote:
> The inline_node structs are maintained by the new dso->inlines
> tree. This in turn keeps ownership of the fake symbols and
> srcline string representing an inline frame.
> 
> This tree is always sorted by name. All other entries of the symbol

Isn't it sorted by address?

> beside the function name are unused for inline frames. The advantage
> of this approach is that all existing users of the callchain API can
> now transparently display inlined frames without having to patch
> their code.
> 
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Yao Jin <yao.jin@...ux.intel.com>
> Signed-off-by: Milian Wolff <milian.wolff@...b.com>
> ---
>  tools/perf/util/dso.c     |  3 +++
>  tools/perf/util/dso.h     |  1 +
>  tools/perf/util/machine.c | 37 ++++++++++++++++++++++++++++++++++
>  tools/perf/util/srcline.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/srcline.h |  9 +++++++++
>  5 files changed, 101 insertions(+)
> 
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index 339e52971380..6e743dffc487 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -10,6 +10,7 @@
>  #include "compress.h"
>  #include "path.h"
>  #include "symbol.h"
> +#include "srcline.h"
>  #include "dso.h"
>  #include "machine.h"
>  #include "auxtrace.h"
> @@ -1201,6 +1202,7 @@ struct dso *dso__new(const char *name)
>  		for (i = 0; i < MAP__NR_TYPES; ++i)
>  			dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
>  		dso->data.cache = RB_ROOT;
> +		dso->inlined_nodes = RB_ROOT;
>  		dso->data.fd = -1;
>  		dso->data.status = DSO_DATA_STATUS_UNKNOWN;
>  		dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
> @@ -1234,6 +1236,7 @@ void dso__delete(struct dso *dso)
>  		       dso->long_name);
>  	for (i = 0; i < MAP__NR_TYPES; ++i)
>  		symbols__delete(&dso->symbols[i]);
> +	inlines__tree_delete(&dso->inlined_nodes);

I'm still curious why it doesn't make a trouble (I think there's
use-after-free for non-inlined symbols).  Anyway moving the
inlines__tree_delete() above the symbols__delete() will solve the
concern IMHO.

Thanks,
Namhyung


>  
>  	if (dso->short_name_allocated) {
>  		zfree((char **)&dso->short_name);

[SNIP]

> diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
> index 07d1a058d7c4..69241d805275 100644
> --- a/tools/perf/util/srcline.c
> +++ b/tools/perf/util/srcline.c
> @@ -583,3 +583,54 @@ void inline_node__delete(struct inline_node *node)
>  
>  	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 0201ed2c0b9c..ebe38cd22294 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;
> @@ -25,6 +26,7 @@ struct inline_list {
>  struct inline_node {
>  	u64			addr;
>  	struct list_head	val;
> +	struct rb_node		rb_node;
>  };
>  
>  /* parse inlined frames for the given address */
> @@ -33,4 +35,11 @@ struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr,
>  /* 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 */
> -- 
> 2.14.2
> 

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