From: Jiri Olsa <jolsa@redhat.com>
To: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Adrian Hunter <adrian.hunter@intel.com>,
Andi Kleen <ak@linux.intel.com>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 06/14] perf data: Add perf_data__(create_dir|free_dir) functions
Date: Tue, 5 Feb 2019 14:42:34 +0100 [thread overview]
Message-ID: <20190205134234.GH4794@krava> (raw)
In-Reply-To: <19a2d4fd-11b4-dc80-2d0a-c4bccd95736c@linux.intel.com>
On Tue, Feb 05, 2019 at 02:52:58PM +0300, Alexey Budankov wrote:
>
> On 03.02.2019 18:30, Jiri Olsa wrote:
> > Adding perf_data__create_dir to create nr files inside
> > struct perf_data path directory:
> > int perf_data__create_dir(struct perf_data *data, int nr);
> >
> > and function to free that data:
> > void perf_data__free_dir(struct perf_data *data);
> >
> > Link: http://lkml.kernel.org/n/tip-kl4s1f13cg6wycrg367p85qm@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > ---
> > tools/perf/util/data.c | 47 ++++++++++++++++++++++++++++++++++++++++++
> > tools/perf/util/data.h | 8 +++++++
> > 2 files changed, 55 insertions(+)
> >
> > diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> > index 0a3051cc0ea0..ff1d9e5bd68d 100644
> > --- a/tools/perf/util/data.c
> > +++ b/tools/perf/util/data.c
> > @@ -7,11 +7,58 @@
> > #include <fcntl.h>
> > #include <unistd.h>
> > #include <string.h>
> > +#include <asm/bug.h>
> >
> > #include "data.h"
> > #include "util.h"
> > #include "debug.h"
> >
> > +static void free_dir(struct perf_data_file *files, int nr)
> > +{
> > + while (--nr >= 1) {
> > + close(files[nr].fd);
> > + free(files[nr].path);
> > + }
> > + free(files);
>
> It implements closing of created files and frees corresponding memory.
> However it doesn't delete the files what looks like the proper rollback
> from perf_data__create_dir() in case of some open() failure.
we don't di rollback event for the single file:
[jolsa@krava perf]$ ./perf record -b ls
Error:
You may not have permission to collect stats.
Consider tweaking /proc/sys/kernel/perf_event_paranoid,
which controls use of the performance events system by
unprivileged users (without CAP_SYS_ADMIN).
The current value is 2:
-1: Allow use of (almost) all events by all users
Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK
>= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN
Disallow raw tracepoint access by users without CAP_SYS_ADMIN
>= 1: Disallow CPU event access by users without CAP_SYS_ADMIN
>= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN
To make this setting permanent, edit /etc/sysctl.conf too, e.g.:
kernel.perf_event_paranoid = -1
[jolsa@krava perf]$ ll perf.data
-rw-------. 1 jolsa jolsa 0 Feb 5 14:40 perf.data
there're multiple points where we could fail during the processing
and fail record command with unfinished perf.data, but yes, I think
we should address that and have some cleanup, I'll check
thanks,
jirka
next prev parent reply other threads:[~2019-02-05 13:42 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-03 15:30 [RFC/PATCH 00/14] perf record: Add support to store data in directory Jiri Olsa
2019-02-03 15:30 ` [PATCH 01/14] perf tools: Make rm_rf to remove single file Jiri Olsa
2019-02-05 11:33 ` Alexey Budankov
2019-02-05 13:38 ` Jiri Olsa
2019-02-03 15:30 ` [PATCH 02/14] perf session: Add process callback to reader object Jiri Olsa
2019-02-03 15:30 ` [PATCH 03/14] perf data: Move size to struct perf_data_file Jiri Olsa
2019-02-03 15:30 ` [PATCH 04/14] perf data: Add global path holder Jiri Olsa
2019-02-03 15:30 ` [PATCH 05/14] perf data: Make check_backup work over directories Jiri Olsa
2019-02-03 15:30 ` [PATCH 06/14] perf data: Add perf_data__(create_dir|free_dir) functions Jiri Olsa
2019-02-05 11:52 ` Alexey Budankov
2019-02-05 13:42 ` Jiri Olsa [this message]
2019-02-05 13:46 ` Arnaldo Carvalho de Melo
2019-02-05 13:53 ` Jiri Olsa
2019-02-03 15:30 ` [PATCH 07/14] perf data: Add perf_data__open_dir_data function Jiri Olsa
2019-02-03 15:30 ` [PATCH 08/14] perf data: Add directory support Jiri Olsa
2019-02-03 15:30 ` [PATCH 09/14] perf data: Don't store auxtrace index for directory data file Jiri Olsa
2019-02-03 15:30 ` [PATCH 10/14] perf data: Add perf_data__update_dir function Jiri Olsa
2019-02-03 15:30 ` [PATCH 11/14] perf data: Make perf_data__size to work over directory Jiri Olsa
2019-02-03 15:30 ` [PATCH 12/14] perf session: Add __perf_session__process_dir_events function Jiri Olsa
2019-02-03 15:30 ` [PATCH 13/14] perf session: Add path to reader object Jiri Olsa
2019-02-03 15:30 ` [PATCH 14/14] perf record: Add --dir option to store data in directory Jiri Olsa
2019-02-05 12:36 ` Alexey Budankov
2019-02-05 13:51 ` Jiri Olsa
2019-02-04 10:12 ` [RFC/PATCH 00/14] perf record: Add support " Alexey Budankov
2019-02-04 10:36 ` Jiri Olsa
2019-02-04 11:29 ` Alexey Budankov
2019-02-04 11:41 ` Jiri Olsa
2019-02-04 18:56 ` Stephane Eranian
2019-02-04 19:27 ` Arnaldo Carvalho de Melo
2019-02-04 19:56 ` Alexey Budankov
2019-02-04 20:05 ` Stephane Eranian
2019-02-04 20:28 ` Jiri Olsa
2019-02-04 22:44 ` Stephane Eranian
2019-02-05 13:37 ` Jiri Olsa
2019-02-11 10:19 ` Jiri Olsa
2019-02-11 18:34 ` Stephane Eranian
2019-02-11 18:53 ` Jiri Olsa
2019-02-11 19:32 ` Arnaldo Carvalho de Melo
2019-02-11 20:18 ` Jiri Olsa
2019-02-11 20:43 ` Stephane Eranian
2019-02-14 11:34 ` Jiri Olsa
2019-02-14 12:57 ` Arnaldo Carvalho de Melo
2019-02-14 13:26 ` Jiri Olsa
2019-02-14 13:59 ` Arnaldo Carvalho de Melo
2019-02-14 21:30 ` Stephane Eranian
[not found] ` <CA+JHD90ssKi3CJ7yfCFTkrS8xwUsZhvd0t7cSCy1MF7TJ2XLYw@mail.gmail.com>
2019-02-14 21:39 ` Stephane Eranian
2019-02-11 18:55 ` Arnaldo Carvalho de Melo
2019-02-11 19:30 ` Stephane Eranian
2019-02-11 20:30 ` Song Liu
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