Messages in this thread Patch in this message | | | Subject | [PATCH v4 4/5] perf/sdt: Delete SDT events from cache | From | Hemant Kumar <> | Date | Sun, 02 Nov 2014 16:25:49 +0530 |
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This patch adds the support to delete SDT events from the cache. To delete an event corresponding to a file, first the cache is read into the file_hash list. The key is calculated from the file name. And then, the file_list for that file_hash entry is traversed to find out the target file_list entry. Once, it is found, its contents are all freed up.
# ./perf sdt-cache --del /usr/lib64/libc-2.16.so 8 event(s) removed for /usr/lib64/libc-2.16.so
Signed-off-by: Hemant Kumar <hemant@linux.vnet.ibm.com> --- tools/perf/Documentation/perf-sdt-cache.txt | 6 +++- tools/perf/builtin-sdt-cache.c | 21 +++++++++++++- tools/perf/util/parse-events.h | 1 + tools/perf/util/sdt.c | 41 +++++++++++++++++++++++++++ 4 files changed, 67 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-sdt-cache.txt b/tools/perf/Documentation/perf-sdt-cache.txt index e57a867..523dcda 100644 --- a/tools/perf/Documentation/perf-sdt-cache.txt +++ b/tools/perf/Documentation/perf-sdt-cache.txt @@ -8,7 +8,7 @@ perf-sdt-cache - Manage SDT events' cache. SYNOPSIS -------- [verse] -'perf sdt-cache --add <file_name>' +'perf sdt-cache [--add | --del] <file_name>' 'perf sdt-cache --dump' DESCRIPTION @@ -23,6 +23,10 @@ OPTIONS --add:: Add SDT events in the specified file to the cache. Takes file name as an argument. +-d:: +--del:: + Remove SDT events in the specified file from the cache. Takes file as an + argument. -D:: --dump:: Dump the contents of SDT events cache onto stdout. diff --git a/tools/perf/builtin-sdt-cache.c b/tools/perf/builtin-sdt-cache.c index 11f41a2..b35d844 100644 --- a/tools/perf/builtin-sdt-cache.c +++ b/tools/perf/builtin-sdt-cache.c @@ -16,6 +16,7 @@ /* Session management structure */ static struct { bool add; + bool del; bool dump; const char *target; } params; @@ -29,6 +30,16 @@ static int opt_add_sdt_events(const struct option *opt __maybe_unused, return 0; } +static int opt_del_sdt_events(const struct option *opt __maybe_unused, + const char *str, int unset __maybe_unused) +{ + params.del = true; + params.target = str; + + return 0; +} + + static int opt_show_sdt_events(const struct option *opt __maybe_unused, const char *str, int unset __maybe_unused) { @@ -45,6 +56,9 @@ int cmd_sdt_cache(int argc, const char **argv, const char *prefix __maybe_unused OPT_CALLBACK('a', "add", NULL, "filename", "add SDT events from a file.", opt_add_sdt_events), + OPT_CALLBACK('d', "del", NULL, "filename", + "Remove SDT events corresponding to a file from the sdt cache.", + opt_del_sdt_events), OPT_CALLBACK_NOOPT('D', "dump", NULL, "show SDT events", "Read SDT events from cache and display.", opt_show_sdt_events), @@ -52,13 +66,14 @@ int cmd_sdt_cache(int argc, const char **argv, const char *prefix __maybe_unused }; const char * const sdt_cache_usage[] = { - "perf sdt-cache --add filename", + "perf sdt-cache [--add | --del] filename", "perf sdt-cache --dump", NULL }; set_option_flag(sdt_cache_options, 'a', "add", PARSE_OPT_EXCLUSIVE); set_option_flag(sdt_cache_options, 'D', "dump", PARSE_OPT_EXCLUSIVE); + set_option_flag(sdt_cache_options, 'd', "del", PARSE_OPT_EXCLUSIVE); argc = parse_options(argc, argv, sdt_cache_options, sdt_cache_usage, @@ -71,6 +86,10 @@ int cmd_sdt_cache(int argc, const char **argv, const char *prefix __maybe_unused ret = add_sdt_events(params.target); if (ret < 0) pr_err("Cannot add SDT events to cache\n"); + } else if (params.del) { + ret = remove_sdt_events(params.target); + if (ret < 0) + pr_err("Cannot remove SDT events from cache\n"); } else if (params.dump) { if (argc == 0) { ret = dump_sdt_events(); diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index cca6859..cafdab6 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -125,5 +125,6 @@ extern int valid_debugfs_mount(const char *debugfs); int add_sdt_events(const char *file); int dump_sdt_events(void); +int remove_sdt_events(const char *str); #endif /* __PERF_PARSE_EVENTS_H */ diff --git a/tools/perf/util/sdt.c b/tools/perf/util/sdt.c index 5f70dd6..9dd7e4da 100644 --- a/tools/perf/util/sdt.c +++ b/tools/perf/util/sdt.c @@ -192,6 +192,7 @@ static int file_hash_list__remove(struct hash_table *file_hash, nr_del = cleanup_sdt_note_list(&fse->sdt_list); hlist_del(&fse->file_list); free(fse); + break; } free(res_path); return nr_del; @@ -661,3 +662,43 @@ int dump_sdt_events(void) file_hash_list__cleanup(&file_hash); return ret; } + +/** + * remove_sdt_events: remove SDT events from cache + * @str: filename + * + * Removes the SDT events from the cache corresponding to the file name + * @str. + */ +int remove_sdt_events(const char *str) +{ + struct hash_table file_hash; + char *res_path; + int nr_del, ret = -ENOMEM; + + res_path = realpath(str, NULL); + if (!res_path) { + pr_err("%s: Bad file name\n", str); + goto out_err; + } + /* Initialize the hash_lists */ + ret = file_hash_list__init(&file_hash); + if (ret < 0) + goto out; + + /* Remove the file_list entry from file_hash and update the file_hash */ + nr_del = file_hash_list__remove(&file_hash, res_path); + if (nr_del > 0) { + printf("%4d event(s) removed for %s\n", nr_del, res_path); + flush_hash_list_to_cache(&file_hash); + ret = nr_del; + goto out; + } else if (!nr_del) + pr_err("Error: Events for %s not found\n", str); + +out: + free(res_path); + file_hash_list__cleanup(&file_hash); +out_err: + return ret; +}
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