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Date: Wed, 2 Sep 2015 10:12:29 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: 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>,
Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 05/15] tools lib api: Move debugfs__strerror_open into
tracing_path.c object
Em Wed, Sep 02, 2015 at 09:56:35AM +0200, Jiri Olsa escreveu:
> Moving debugfs__strerror_open out of api/fs/debugfs.c,
> because it's not debugfs specific. It'll be changed to
> consider tracefs mount as well in following patches.
>
> Renaming it into tracing_path__strerror_open_tp to fit
> into the namespace. No functional change is intended.
Humm, here I think that "_path" may look excessive... But tracing_path__ better
than debugfs__, so its progress, applying, if we get a better name, we
can change this later.
- Arnaldo
> Link: http://lkml.kernel.org/n/tip-bq0f0l4r0bjvy0pjp4m759kv@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
> tools/lib/api/fs/debugfs.c | 52 ---------------------------------------
> tools/lib/api/fs/tracing_path.c | 54 +++++++++++++++++++++++++++++++++++++++++
> tools/lib/api/fs/tracing_path.h | 3 +++
> tools/perf/builtin-trace.c | 5 ++--
> 4 files changed, 60 insertions(+), 54 deletions(-)
>
> diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
> index eb7cf4d18f8a..c707cfb32782 100644
> --- a/tools/lib/api/fs/debugfs.c
> +++ b/tools/lib/api/fs/debugfs.c
> @@ -75,55 +75,3 @@ char *debugfs_mount(const char *mountpoint)
> out:
> return debugfs_mountpoint;
> }
> -
> -int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename)
> -{
> - char sbuf[128];
> -
> - switch (err) {
> - case ENOENT:
> - if (debugfs_found) {
> - snprintf(buf, size,
> - "Error:\tFile %s/%s not found.\n"
> - "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
> - debugfs_mountpoint, filename);
> - break;
> - }
> - snprintf(buf, size, "%s",
> - "Error:\tUnable to find debugfs\n"
> - "Hint:\tWas your kernel compiled with debugfs support?\n"
> - "Hint:\tIs the debugfs filesystem mounted?\n"
> - "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
> - break;
> - case EACCES: {
> - const char *mountpoint = debugfs_mountpoint;
> -
> - if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
> - const char *tracefs_mntpoint = tracefs_find_mountpoint();
> -
> - if (tracefs_mntpoint)
> - mountpoint = tracefs_mntpoint;
> - }
> -
> - snprintf(buf, size,
> - "Error:\tNo permissions to read %s/%s\n"
> - "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
> - debugfs_mountpoint, filename, mountpoint);
> - }
> - break;
> - default:
> - snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
> - break;
> - }
> -
> - return 0;
> -}
> -
> -int debugfs__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);
> -}
> diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
> index 1fd6e1f99234..3b3e4f5fc50b 100644
> --- a/tools/lib/api/fs/tracing_path.c
> +++ b/tools/lib/api/fs/tracing_path.c
> @@ -5,6 +5,8 @@
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> +#include <errno.h>
> +#include <unistd.h>
> #include "debugfs.h"
> #include "tracefs.h"
>
> @@ -81,3 +83,55 @@ void put_tracing_file(char *file)
> {
> free(file);
> }
> +
> +static int strerror_open(int err, char *buf, size_t size, const char *filename)
> +{
> + char sbuf[128];
> +
> + switch (err) {
> + case ENOENT:
> + if (debugfs_configured()) {
> + snprintf(buf, size,
> + "Error:\tFile %s/%s not found.\n"
> + "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
> + debugfs_mountpoint, filename);
> + break;
> + }
> + snprintf(buf, size, "%s",
> + "Error:\tUnable to find debugfs\n"
> + "Hint:\tWas your kernel compiled with debugfs support?\n"
> + "Hint:\tIs the debugfs filesystem mounted?\n"
> + "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
> + break;
> + case EACCES: {
> + const char *mountpoint = debugfs_mountpoint;
> +
> + if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
> + const char *tracefs_mntpoint = tracefs_find_mountpoint();
> +
> + if (tracefs_mntpoint)
> + mountpoint = tracefs_mntpoint;
> + }
> +
> + snprintf(buf, size,
> + "Error:\tNo permissions to read %s/%s\n"
> + "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
> + debugfs_mountpoint, filename, mountpoint);
> + }
> + break;
> + default:
> + snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
> + break;
> + }
> +
> + return 0;
> +}
> +
> +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 strerror_open(err, buf, size, path);
> +}
> diff --git a/tools/lib/api/fs/tracing_path.h b/tools/lib/api/fs/tracing_path.h
> index b132dc599fe5..3f233ac70b6f 100644
> --- a/tools/lib/api/fs/tracing_path.h
> +++ b/tools/lib/api/fs/tracing_path.h
> @@ -1,6 +1,8 @@
> #ifndef __API_FS_TRACING_PATH_H
> #define __API_FS_TRACING_PATH_H
>
> +#include <linux/types.h>
> +
> extern char tracing_path[];
> extern char tracing_events_path[];
>
> @@ -10,4 +12,5 @@ const char *tracing_path_mount(void);
> char *get_tracing_file(const char *name);
> void put_tracing_file(char *file);
>
> +int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name);
> #endif /* __API_FS_TRACING_PATH_H */
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index 4e3abba03062..215653274102 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -17,6 +17,7 @@
> */
>
> #include <traceevent/event-parse.h>
> +#include <api/fs/tracing_path.h>
> #include "builtin.h"
> #include "util/color.h"
> #include "util/debug.h"
> @@ -2686,11 +2687,11 @@ 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:
> --
> 2.4.3
--
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