linux-kernel - Re: perf archive warning

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Date:	Thu, 03 Mar 2011 12:21:01 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Han Pingtian <phan@...hat.com>
Cc:	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: perf archive warning

On Thu, 2011-03-03 at 12:21 +0800, Han Pingtian wrote:
> On Thu, Mar 03, 2011 at 08:38:25AM +0800, Lin Ming wrote:
> > On Wed, 2011-03-02 at 16:53 +0800, Han Pingtian wrote:
> > > On Wed, Mar 02, 2011 at 04:29:41PM +0800, Lin Ming wrote:
> > > > > 
> > > > > root@...el-s3e36-01 perf]# ./perf-archive
> > > > > tar: .build-id/b2/370e39ea2898c6e11c188e2f3879e4e3d6d1ef: Cannot stat:
> > > > > No such file or directory
> > > > > tar: .build-id/b2/370e39ea2898c6e11c188e2f3879e4e3d6d1ef: Cannot stat:
> > > > > No such file or directory
> > > > > tar: Exiting with failure status due to previous errors
> > > > 
> > > > kernel.kallsyms is not created successfully in the buildid-cache.
> > > > Could you have a try below patch?
> > > > 
> > > > diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> > > > index 72c124d..d3b5062 100644
> > > > --- a/tools/perf/util/header.c
> > > > +++ b/tools/perf/util/header.c
> > > > @@ -271,11 +271,16 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
> > > >  			  const char *name, bool is_kallsyms)
> > > >  {
> > > >  	const size_t size = PATH_MAX;
> > > > -	char *realname = realpath(name, NULL),
> > > > +	char *realname,
> > > >  	     *filename = malloc(size),
> > > >  	     *linkname = malloc(size), *targetname;
> > > >  	int len, err = -1;
> > > >  
> > > > +	if (is_kallsyms)
> > > > +		realname = (char *)name;
> > > > +	else
> > > > +		realname = realpath(name, NULL);
> > > > +
> > > >  	if (realname == NULL || filename == NULL || linkname == NULL)
> > > >  		goto out_free;
> > > >  
> > > > @@ -307,7 +312,8 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
> > > >  	if (symlink(targetname, linkname) == 0)
> > > >  		err = 0;
> > > >  out_free:
> > > > -	free(realname);
> > > > +	if (!is_kallsyms)
> > > > +		free(realname);
> > > >  	free(filename);
> > > >  	free(linkname);
> > > >  	return err;
> > > > 
> > > The patch didn't fix this problem. 
> > 
> > Did you re-run perf command?
> > Need to re-run it to generate kernel.kallsyms build-id cache.
> > 
> > For example, 
> > 
> > $ perf record -- sleep 3
> > $ perf-archive
> I think I must do something wrong yesterday when testing your patch. It
> works just fine today, the problem has been fixed by it. Thanks! 

OK. I'll send out a patch with your Tested-by.

Lin Ming

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