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Message-ID: <20150826145855.GA1139@kernel.org>
Date: Wed, 26 Aug 2015 11:58:55 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
David Ahern <dsahern@...il.com>,
Ingo Molnar <mingo@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Matt Fleming <matt@...eblueprint.co.uk>,
Raphaël Beamonte <raphael.beamonte@...il.com>
Subject: Re: [PATCH 05/11] perf tools: Move tracing_path stuff under same
namespace
Em Wed, Aug 26, 2015 at 04:48:36PM +0200, Jiri Olsa escreveu:
> On Wed, Aug 26, 2015 at 11:42:11AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Aug 26, 2015 at 03:46:47PM +0200, Jiri Olsa escreveu:
> > > Renaming all functions touching tracing_path under same
> > > namespace. New interface is:
> >
> > But we were trying to have debugfs stuff in tools/lib/api/fs/, so that
> > it could eventually be used by some other tools, etc, and now we're
> > going the other way around, de-librarifying, not good :-\
>
> well this gathers tracefs/debugfs together, the api/fs/{trace|debug}fs
> are just building blocks
>
> I only moved the debugfs__strerror_open_tp out of the debugfs object
> because it needs to be one layer up, because it needs to touch tracefs
> as well
Why not leave it there, since, for historical reasons, what is tracefs
now was something implemented inside debugfs, so having that special
case in debugfs__strerror_open_tp():
if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
Is ok, since tools will need to deal with older kernels, etc.
But ok, I see your point, we should rename it to something like
tracepoint__strerror_open_definition(), so as to detach this from
"debugfs" _and_ "tracefs", pseudo-filesystem based DWARF-like stuff
(event definitions), but then why not have that somewhere in
tools/lib/api/tracepoint/.
Or was it the difficulty in getting this nicely namespaced what made
you get it back to tools/perf/util/?
I can have some empathy for that, if that is the case ;-\
- Arnaldo
> >
> > - Arnaldo
> >
> > > char tracing_path[];
> > > char tracing_events_path[];
> > > - tracing mount
> > >
> > > void perf_tracing_path_set(const char *mountpoint);
> > > - setting directly tracing_path(_events), used by --debugfs-dir option
> > >
> > > const char *perf_tracing_path_mount(const char *mountpoint);
> > > - initial setup of tracing_path(_events), called from perf.c
> > >
> > > int tracing_path_strerror_open(int err, char *buf, size_t size, const char *filename);
> > > int tracing_path_strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name);
> > > - strerror functions to get error string when failing to open
> > > tracepoint files
> > >
> > > char *get_tracing_file(const char *name);
> > > void put_tracing_file(char *file);
> > > - get/put tracing file path
> > >
> > > Link: http://lkml.kernel.org/n/tip-miy6kftxxryjf40b3qb6eknc@git.kernel.org
> > > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > > ---
> > > tools/perf/builtin-trace.c | 4 ++--
> > > tools/perf/perf.c | 8 ++++----
> > > tools/perf/util/util.c | 26 +++++++++++++-------------
> > > tools/perf/util/util.h | 8 ++++----
> > > 4 files changed, 23 insertions(+), 23 deletions(-)
> > >
> > > diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> > > index 2f1162daa3c5..384ebe32698a 100644
> > > --- a/tools/perf/builtin-trace.c
> > > +++ b/tools/perf/builtin-trace.c
> > > @@ -2667,11 +2667,11 @@ out_delete_evlist:
> > > char errbuf[BUFSIZ];
> > >
> > > out_error_sched_stat_runtime:
> > > - debugfs__strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");
> > > + tracing_path_strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");
> > > goto out_error;
> > >
> > > out_error_raw_syscalls:
> > > - debugfs__strerror_open_tp(errno, errbuf, sizeof(errbuf), "raw_syscalls", "sys_(enter|exit)");
> > > + tracing_path_strerror_open_tp(errno, errbuf, sizeof(errbuf), "raw_syscalls", "sys_(enter|exit)");
> > > goto out_error;
> > >
> > > out_error_mmap:
> > > diff --git a/tools/perf/perf.c b/tools/perf/perf.c
> > > index 07dbff5c0e60..c5acdadde347 100644
> > > --- a/tools/perf/perf.c
> > > +++ b/tools/perf/perf.c
> > > @@ -214,7 +214,7 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
> > > fprintf(stderr, "No directory given for --debugfs-dir.\n");
> > > usage(perf_usage_string);
> > > }
> > > - perf_debugfs_set_path((*argv)[1]);
> > > + perf_tracing_path_set((*argv)[1]);
> > > if (envchanged)
> > > *envchanged = 1;
> > > (*argv)++;
> > > @@ -230,7 +230,7 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
> > > (*argv)++;
> > > (*argc)--;
> > > } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
> > > - perf_debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
> > > + perf_tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
> > > fprintf(stderr, "dir: %s\n", tracing_path);
> > > if (envchanged)
> > > *envchanged = 1;
> > > @@ -517,8 +517,8 @@ int main(int argc, const char **argv)
> > > cmd = perf_extract_argv0_path(argv[0]);
> > > if (!cmd)
> > > cmd = "perf-help";
> > > - /* get debugfs mount point from /proc/mounts */
> > > - perf_debugfs_mount(NULL);
> > > + /* get debugfs/tracefs mount point from /proc/mounts */
> > > + perf_tracing_path_mount(NULL);
> > > /*
> > > * "perf-xxxx" is the same as "perf xxxx", but we obviously:
> > > *
> > > diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> > > index 03d1d74a5ede..675d112a887d 100644
> > > --- a/tools/perf/util/util.c
> > > +++ b/tools/perf/util/util.c
> > > @@ -390,7 +390,7 @@ void set_term_quiet_input(struct termios *old)
> > > tcsetattr(0, TCSANOW, &tc);
> > > }
> > >
> > > -static void set_tracing_events_path(const char *tracing, const char *mountpoint)
> > > +static void tracing_path_set(const char *tracing, const char *mountpoint)
> > > {
> > > snprintf(tracing_path, sizeof(tracing_path), "%s/%s",
> > > mountpoint, tracing);
> > > @@ -398,7 +398,7 @@ static void set_tracing_events_path(const char *tracing, const char *mountpoint)
> > > mountpoint, tracing, "events");
> > > }
> > >
> > > -static const char *__perf_tracefs_mount(const char *mountpoint)
> > > +static const char *tracing_path_tracefs_mount(const char *mountpoint)
> > > {
> > > const char *mnt;
> > >
> > > @@ -406,12 +406,12 @@ static const char *__perf_tracefs_mount(const char *mountpoint)
> > > if (!mnt)
> > > return NULL;
> > >
> > > - set_tracing_events_path("", mnt);
> > > + tracing_path_set("", mnt);
> > >
> > > return mnt;
> > > }
> > >
> > > -static const char *__perf_debugfs_mount(const char *mountpoint)
> > > +static const char *tracing_path_debugfs_mount(const char *mountpoint)
> > > {
> > > const char *mnt;
> > >
> > > @@ -419,30 +419,30 @@ static const char *__perf_debugfs_mount(const char *mountpoint)
> > > if (!mnt)
> > > return NULL;
> > >
> > > - set_tracing_events_path("tracing/", mnt);
> > > + tracing_path_set("tracing/", mnt);
> > >
> > > return mnt;
> > > }
> > >
> > > -const char *perf_debugfs_mount(const char *mountpoint)
> > > +const char *perf_tracing_path_mount(const char *mountpoint)
> > > {
> > > const char *mnt;
> > >
> > > - mnt = __perf_tracefs_mount(mountpoint);
> > > + mnt = tracing_path_tracefs_mount(mountpoint);
> > > if (mnt)
> > > return mnt;
> > >
> > > - mnt = __perf_debugfs_mount(mountpoint);
> > > + mnt = tracing_path_debugfs_mount(mountpoint);
> > >
> > > return mnt;
> > > }
> > >
> > > -void perf_debugfs_set_path(const char *mntpt)
> > > +void perf_tracing_path_set(const char *mntpt)
> > > {
> > > - set_tracing_events_path("tracing/", mntpt);
> > > + tracing_path_set("tracing/", mntpt);
> > > }
> > >
> > > -int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename)
> > > +int tracing_path_strerror_open(int err, char *buf, size_t size, const char *filename)
> > > {
> > > char sbuf[128];
> > >
> > > @@ -485,13 +485,13 @@ int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename
> > > return 0;
> > > }
> > >
> > > -int debugfs__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name)
> > > +int tracing_path_strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name)
> > > {
> > > char path[PATH_MAX];
> > >
> > > snprintf(path, PATH_MAX, "tracing/events/%s/%s", sys, name ?: "*");
> > >
> > > - return debugfs__strerror_open(err, buf, size, path);
> > > + return tracing_path_strerror_open(err, buf, size, path);
> > > }
> > >
> > > char *get_tracing_file(const char *name)
> > > diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
> > > index da48c00ab0db..34a68faf53fe 100644
> > > --- a/tools/perf/util/util.h
> > > +++ b/tools/perf/util/util.h
> > > @@ -85,10 +85,10 @@ extern const char *graph_dotted_line;
> > > extern char buildid_dir[];
> > > extern char tracing_path[];
> > > extern char tracing_events_path[];
> > > -extern void perf_debugfs_set_path(const char *mountpoint);
> > > -const char *perf_debugfs_mount(const char *mountpoint);
> > > -int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename);
> > > -int debugfs__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name);
> > > +extern void perf_tracing_path_set(const char *mountpoint);
> > > +const char *perf_tracing_path_mount(const char *mountpoint);
> > > +int tracing_path_strerror_open(int err, char *buf, size_t size, const char *filename);
> > > +int tracing_path_strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name);
> > > char *get_tracing_file(const char *name);
> > > void put_tracing_file(char *file);
> > >
> > > --
> > > 2.4.3
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