perf tools: Simplify debugfs mountpoint handling code
We don't need to have two PATH_MAX char sized arrays holding it, just one in util/debugfs.c will do. Also rename debugfs_path to tracing_events_path, as it is not the path to debugfs, that is debugfs_mountpoint. Both are now accessible. This will allow accessing this code in the perf python binding without having to drag in perf.c and util/parse-events.c. The defaults for these variables are the canonical "/sys/kernel/debug" and "/sys/kernel/debug/tracing/events/", removing the need for simple tools to call debugfs_mount(NULL). Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-ug9jvtjrsqbluuhqqxpvg30f@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
Родитель
c168fbfb93
Коммит
ebf294bf4f
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@ -7,6 +7,7 @@
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#include "util/cache.h"
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#include "util/debug.h"
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#include "util/debugfs.h"
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#include "util/evlist.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h"
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@ -247,7 +248,7 @@ static int trace_event__id(const char *evname)
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if (asprintf(&filename,
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"%s/syscalls/%s/id",
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debugfs_path, evname) < 0)
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tracing_events_path, evname) < 0)
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return -1;
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fd = open(filename, O_RDONLY);
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@ -29,8 +29,6 @@ struct pager_config {
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int val;
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};
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static char debugfs_mntpt[MAXPATHLEN];
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static int pager_command_config(const char *var, const char *value, void *data)
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{
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struct pager_config *c = data;
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@ -81,15 +79,6 @@ static void commit_pager_choice(void)
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}
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}
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static void set_debugfs_path(void)
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{
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char *path;
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path = getenv(PERF_DEBUGFS_ENVIRONMENT);
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snprintf(debugfs_path, MAXPATHLEN, "%s/%s", path ?: debugfs_mntpt,
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"tracing/events");
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}
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static int handle_options(const char ***argv, int *argc, int *envchanged)
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{
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int handled = 0;
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@ -161,15 +150,14 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
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fprintf(stderr, "No directory given for --debugfs-dir.\n");
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usage(perf_usage_string);
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}
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strncpy(debugfs_mntpt, (*argv)[1], MAXPATHLEN);
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debugfs_mntpt[MAXPATHLEN - 1] = '\0';
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debugfs_set_path((*argv)[1]);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
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strncpy(debugfs_mntpt, cmd + strlen(CMD_DEBUGFS_DIR), MAXPATHLEN);
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debugfs_mntpt[MAXPATHLEN - 1] = '\0';
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debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
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fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
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if (envchanged)
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*envchanged = 1;
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} else {
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@ -281,7 +269,6 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
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if (use_pager == -1 && p->option & USE_PAGER)
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use_pager = 1;
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commit_pager_choice();
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set_debugfs_path();
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status = p->fn(argc, argv, prefix);
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exit_browser(status);
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@ -416,17 +403,6 @@ static int run_argv(int *argcp, const char ***argv)
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return done_alias;
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}
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/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
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static void get_debugfs_mntpt(void)
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{
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const char *path = debugfs_mount(NULL);
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if (path)
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strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
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else
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debugfs_mntpt[0] = '\0';
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}
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static void pthread__block_sigwinch(void)
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{
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sigset_t set;
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@ -453,7 +429,7 @@ int main(int argc, const char **argv)
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if (!cmd)
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cmd = "perf-help";
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/* get debugfs mount point from /proc/mounts */
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get_debugfs_mntpt();
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debugfs_mount(NULL);
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/*
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* "perf-xxxx" is the same as "perf xxxx", but we obviously:
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*
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@ -476,7 +452,6 @@ int main(int argc, const char **argv)
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argc--;
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handle_options(&argv, &argc, NULL);
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commit_pager_choice();
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set_debugfs_path();
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set_buildid_dir();
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if (argc > 0) {
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@ -2,10 +2,12 @@
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#include "debugfs.h"
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#include "cache.h"
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#include <linux/kernel.h>
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#include <sys/mount.h>
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static int debugfs_premounted;
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static char debugfs_mountpoint[PATH_MAX + 1];
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char debugfs_mountpoint[PATH_MAX + 1] = "/sys/kernel/debug";
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char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
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static const char *debugfs_known_mountpoints[] = {
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"/sys/kernel/debug/",
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@ -64,7 +66,7 @@ const char *debugfs_find_mountpoint(void)
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/* give up and parse /proc/mounts */
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fp = fopen("/proc/mounts", "r");
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if (fp == NULL)
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die("Can't open /proc/mounts for read");
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return NULL;
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while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
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debugfs_mountpoint, type) == 2) {
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@ -106,6 +108,12 @@ int debugfs_valid_entry(const char *path)
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return 0;
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}
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static void debugfs_set_tracing_events_path(const char *mountpoint)
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{
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snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s",
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mountpoint, "tracing/events");
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}
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/* mount the debugfs somewhere if it's not mounted */
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char *debugfs_mount(const char *mountpoint)
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@ -113,7 +121,7 @@ char *debugfs_mount(const char *mountpoint)
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/* see if it's already mounted */
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if (debugfs_find_mountpoint()) {
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debugfs_premounted = 1;
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return debugfs_mountpoint;
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goto out;
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}
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/* if not mounted and no argument */
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@ -129,12 +137,19 @@ char *debugfs_mount(const char *mountpoint)
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return NULL;
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/* save the mountpoint */
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strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
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debugfs_found = 1;
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strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
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out:
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debugfs_set_tracing_events_path(debugfs_mountpoint);
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return debugfs_mountpoint;
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}
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void debugfs_set_path(const char *mountpoint)
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{
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snprintf(debugfs_mountpoint, sizeof(debugfs_mountpoint), "%s", mountpoint);
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debugfs_set_tracing_events_path(mountpoint);
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}
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/* umount the debugfs */
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int debugfs_umount(void)
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@ -6,9 +6,13 @@ int debugfs_valid_mountpoint(const char *debugfs);
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int debugfs_valid_entry(const char *path);
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char *debugfs_mount(const char *mountpoint);
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int debugfs_umount(void);
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void debugfs_set_path(const char *mountpoint);
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int debugfs_write(const char *entry, const char *value);
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int debugfs_read(const char *entry, char *buffer, size_t size);
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void debugfs_force_cleanup(void);
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int debugfs_make_path(const char *element, char *buffer, int size);
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extern char debugfs_mountpoint[];
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extern char tracing_events_path[];
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#endif /* __DEBUGFS_H__ */
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@ -25,8 +25,6 @@ enum event_result {
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EVT_HANDLED_ALL
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};
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char debugfs_path[MAXPATHLEN];
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#define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
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#define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
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@ -140,7 +138,7 @@ static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
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char evt_path[MAXPATHLEN];
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int fd;
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", tracing_events_path,
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sys_dir->d_name, evt_dir->d_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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@ -171,16 +169,16 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
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char evt_path[MAXPATHLEN];
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char dir_path[MAXPATHLEN];
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if (debugfs_valid_mountpoint(debugfs_path))
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if (debugfs_valid_mountpoint(tracing_events_path))
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return NULL;
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sys_dir = opendir(debugfs_path);
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sys_dir = opendir(tracing_events_path);
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if (!sys_dir)
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return NULL;
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for_each_subsystem(sys_dir, sys_dirent, sys_next) {
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snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
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snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
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sys_dirent.d_name);
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evt_dir = opendir(dir_path);
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if (!evt_dir)
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@ -447,7 +445,7 @@ parse_single_tracepoint_event(char *sys_name,
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u64 id;
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int fd;
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", tracing_events_path,
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sys_name, evt_name);
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fd = open(evt_path, O_RDONLY);
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@ -485,7 +483,7 @@ parse_multiple_tracepoint_event(struct perf_evlist *evlist, char *sys_name,
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struct dirent *evt_ent;
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DIR *evt_dir;
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snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
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snprintf(evt_path, MAXPATHLEN, "%s/%s", tracing_events_path, sys_name);
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evt_dir = opendir(evt_path);
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if (!evt_dir) {
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@ -528,7 +526,7 @@ parse_tracepoint_event(struct perf_evlist *evlist, const char **strp,
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char sys_name[MAX_EVENT_LENGTH];
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unsigned int sys_length, evt_length;
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if (debugfs_valid_mountpoint(debugfs_path))
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if (debugfs_valid_mountpoint(tracing_events_path))
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return 0;
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evt_name = strchr(*strp, ':');
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@ -920,10 +918,10 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob)
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char evt_path[MAXPATHLEN];
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char dir_path[MAXPATHLEN];
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if (debugfs_valid_mountpoint(debugfs_path))
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if (debugfs_valid_mountpoint(tracing_events_path))
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return;
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sys_dir = opendir(debugfs_path);
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sys_dir = opendir(tracing_events_path);
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if (!sys_dir)
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return;
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@ -932,7 +930,7 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob)
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!strglobmatch(sys_dirent.d_name, subsys_glob))
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continue;
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snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
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snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
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sys_dirent.d_name);
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evt_dir = opendir(dir_path);
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if (!evt_dir)
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@ -964,16 +962,16 @@ int is_valid_tracepoint(const char *event_string)
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char evt_path[MAXPATHLEN];
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char dir_path[MAXPATHLEN];
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if (debugfs_valid_mountpoint(debugfs_path))
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if (debugfs_valid_mountpoint(tracing_events_path))
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return 0;
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sys_dir = opendir(debugfs_path);
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sys_dir = opendir(tracing_events_path);
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if (!sys_dir)
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return 0;
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for_each_subsystem(sys_dir, sys_dirent, sys_next) {
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snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
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snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
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sys_dirent.d_name);
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evt_dir = opendir(dir_path);
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if (!evt_dir)
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@ -39,7 +39,6 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob);
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int print_hwcache_events(const char *event_glob);
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extern int is_valid_tracepoint(const char *event_string);
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extern char debugfs_path[];
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extern int valid_debugfs_mount(const char *debugfs);
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#endif /* __PERF_PARSE_EVENTS_H */
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