linux-kernel - Re: [PATCH 02/12] perf tools: Separate generic code in dso_cache_

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Date:   Tue, 16 Apr 2019 20:21:39 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Stanislav Fomichev <sdf@...ichev.me>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Song Liu <songliubraving@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH 02/12] perf tools: Separate generic code in
 dso_cache__read

On Tue, Apr 16, 2019 at 10:17:13AM -0700, Stanislav Fomichev wrote:
> On 04/16, Jiri Olsa wrote:
> > Moving file specific code in dso_cache__read function
> > into separate file_read function. I'll add bpf specific
> > code in following patches.
> > 
> > Link: http://lkml.kernel.org/n/tip-7f7d717uzrqt5ka2xp29ige3@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/util/dso.c | 47 ++++++++++++++++++++++++-------------------
> >  1 file changed, 26 insertions(+), 21 deletions(-)
> > 
> > diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> > index cb6199c1390a..6baad22ec8a9 100644
> > --- a/tools/perf/util/dso.c
> > +++ b/tools/perf/util/dso.c
> > @@ -794,6 +794,30 @@ dso_cache__memcpy(struct dso_cache *cache, u64 offset,
> >  	return cache_size;
> >  }
> >  
> > +static ssize_t file_read(struct dso *dso, struct machine *machine,
> > +			 u64 offset, char *data)
> > +{
> > +	ssize_t ret;
> > +
> > +	pthread_mutex_lock(&dso__data_open_lock);
> > +
> > +	/*
> > +	 * dso->data.fd might be closed if other thread opened another
> > +	 * file (dso) due to open file limit (RLIMIT_NOFILE).
> > +	 */
> > +	try_to_open_dso(dso, machine);
> > +
> > +	if (dso->data.fd < 0) {
> > +		dso->data.status = DSO_DATA_STATUS_ERROR;
> pthread_mutex_unlock(&dso__data_open_lock) here?

oops, yea.. thanks

jirka