linux-kernel - Re: [PATCH v2] perf report: always honor callchain order for inlined nodes

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Date:   Thu, 18 May 2017 12:16:22 +0200
From:   Milian Wolff <milian.wolff@...b.com>
To:     Namhyung Kim <namhyung@...nel.org>
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 v2] perf report: always honor callchain order for inlined nodes

On Donnerstag, 18. Mai 2017 11:48:20 CEST Namhyung Kim wrote:
> On Thu, May 18, 2017 at 10:37:59AM +0200, Milian Wolff wrote:
> > So far, the inlined nodes where only reversed when we built perf
> > against libbfd. If that was not available, the addr2line fallback
> > code path was missing the inline_list__reverse call.
> > 
> > Now we always add the nodes in the correct order within
> > inline_list__append. This removes the need to reverse the list
> > and also ensures that all callers construct the list in the right
> > order.
> > 
> > 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/srcline.c | 23 ++++++++---------------
> >  1 file changed, 8 insertions(+), 15 deletions(-)
> > 
> > v2:
> > - directly create list in correct order as suggested by Namhyung
> > 
> > diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
> > index 5e376d64d59e..bbba9c69cfec 100644
> > --- a/tools/perf/util/srcline.c
> > +++ b/tools/perf/util/srcline.c
> > @@ -56,7 +56,10 @@ static int inline_list__append(char *filename, char
> > *funcname, int line_nr,> 
> >  		}
> >  	
> >  	}
> > 
> > -	list_add_tail(&ilist->list, &node->val);
> > +	if (callchain_param.order == ORDER_CALLEE)
> > +		list_add_tail(&ilist->list, &node->val);
> > +	else
> > +		list_add(&ilist->list, &node->val);
> > 
> >  	return 0;
> >  
> >  }
> > 
> > @@ -200,14 +203,6 @@ static void addr2line_cleanup(struct a2l_data *a2l)
> > 
> >  #define MAX_INLINE_NEST 1024
> > 
> > -static void inline_list__reverse(struct inline_node *node)
> > -{
> > -	struct inline_list *ilist, *n;
> > -
> > -	list_for_each_entry_safe_reverse(ilist, n, &node->val, list)
> > -		list_move_tail(&ilist->list, &node->val);
> > -}
> > -
> > 
> >  static int addr2line(const char *dso_name, u64 addr,
> >  
> >  		     char **file, unsigned int *line, struct dso *dso,
> >  		     bool unwind_inlines, struct inline_node *node)
> > 
> > @@ -250,11 +245,6 @@ static int addr2line(const char *dso_name, u64 addr,
> > 
> >  				ret = 1;
> >  			
> >  			}
> >  		
> >  		}
> > 
> > -
> > -		if ((node != NULL) &&
> > -		    (callchain_param.order != ORDER_CALLEE)) {
> > -			inline_list__reverse(node);
> > -		}
> > 
> >  	}
> >  	
> >  	if (file) {
> > 
> > @@ -497,12 +487,15 @@ char *get_srcline(struct dso *dso, u64 addr, struct
> > symbol *sym,> 
> >  struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr)
> >  {
> >  
> >  	const char *dso_name;
> > 
> > +	struct inline_node *node;
> > 
> >  	dso_name = dso__name(dso);
> >  	if (dso_name == NULL)
> >  	
> >  		return NULL;
> > 
> > -	return addr2inlines(dso_name, addr, dso);
> > +	node = addr2inlines(dso_name, addr, dso);
> > +
> > +	return node;
> 
> Looks like an unnecessary change.

Yes, true. Will clean up and send v3.

Cheers

-- 
Milian Wolff | milian.wolff@...b.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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