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Date: Thu, 28 Aug 2014 03:20:22 +0530 From: Hemant Kumar <hemant@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: srikar@...ux.vnet.ibm.com, peterz@...radead.org, oleg@...hat.com, hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com, anton@...hat.com, systemtap@...rceware.org, namhyung@...nel.org, masami.hiramatsu.pt@...achi.com, aravinda@...ux.vnet.ibm.com, penberg@....fi Subject: [PATCH v4 2/3] perf/sdt : Support perf-list to print SDT events in a single file This patch enables perf to look for SDT markers in a single file. An individual file argument must be given to "perf list" to find out the SDT markers present in that file. Usage is as below : # perf list sdt /home/hemant/tmp /home/hemant/tmp: %user : foo %user : bar On using this command, perf looks for SDTs in that file using the ELF functions from the previous patch (in this series) and dumps them on stdout. Signed-off-by : Hemant Kumar <hemant@...ux.vnet.ibm.com> --- tools/perf/Makefile.perf | 1 tools/perf/builtin-list.c | 2 + tools/perf/util/parse-events.h | 2 + tools/perf/util/sdt.c | 113 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 118 insertions(+) create mode 100644 tools/perf/util/sdt.c diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index 9670a16..e098dcd 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -373,6 +373,7 @@ LIB_OBJS += $(OUTPUT)util/stat.o LIB_OBJS += $(OUTPUT)util/record.o LIB_OBJS += $(OUTPUT)util/srcline.o LIB_OBJS += $(OUTPUT)util/data.o +LIB_OBJS += $(OUTPUT)util/sdt.o LIB_OBJS += $(OUTPUT)ui/setup.o LIB_OBJS += $(OUTPUT)ui/helpline.o diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c index 011195e..85be3e3 100644 --- a/tools/perf/builtin-list.c +++ b/tools/perf/builtin-list.c @@ -53,6 +53,8 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused) print_hwcache_events(NULL, false); else if (strcmp(argv[i], "pmu") == 0) print_pmu_events(NULL, false); + else if (strcmp(argv[i], "sdt") == 0) + print_sdt_events(argv[++i]); else if (strcmp(argv[i], "--raw-dump") == 0) print_events(NULL, true); else { diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index df094b4..fadc729 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -109,4 +109,6 @@ extern int is_valid_tracepoint(const char *event_string); extern int valid_debugfs_mount(const char *debugfs); +void print_sdt_events(const char *arg); + #endif /* __PERF_PARSE_EVENTS_H */ diff --git a/tools/perf/util/sdt.c b/tools/perf/util/sdt.c new file mode 100644 index 0000000..12c16a0 --- /dev/null +++ b/tools/perf/util/sdt.c @@ -0,0 +1,113 @@ +/* + * util/sdt.c + * This contains the relevant functions needed to find the SDT markers + * in a binary. + * + * TODOS: + * - Listing SDT events in most of the binaries present in the system. + * - Build a cache for these SDT events. + * - Looking into directories provided by the user for binaries with SDTs, etc. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <string.h> + +#include "parse-events.h" +#include "linux/list.h" +#include "symbol.h" + + +/* + * get_sdt_note_info(): flush the SDT notes onto stdout + */ +static void get_sdt_note_info(struct list_head *start, const char *target) +{ + struct sdt_note *pos; + + if (list_empty(start)) + return; + + printf("%s :\n", target); + list_for_each_entry(pos, start, note_list) { + printf("%%%s : %s\n", pos->provider, pos->name); + } +} + +/* + * Error displayed in case of query of a + * single file for SDT markers + */ +static int sdt_err(int val, const char *target) +{ + switch (-val) { + case 0: + break; + case ENOENT: + /* Absence of SDT markers */ + printf("%s : No SDT events found\n", target); + break; + case EBADF: + printf("%s : Bad file name\n", target); + break; + default: + printf("%s\n", strerror(val)); + } + + return val; +} + +/* + * cleanup_sdt_note_list() : Free the sdt note list + */ +static void cleanup_sdt_note_list(struct list_head *sdt_notes) +{ + struct sdt_note *tmp, *pos; + + if (list_empty(sdt_notes)) + return; + + list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) { + list_del(&pos->note_list); + free(pos->name); + free(pos->provider); + free(pos); + } +} + +/* + * filename__find_sdt() : looks for sdt markers and the list is + * stored in sdt_notes + */ +static int filename__find_sdt(const char *target) +{ + int ret; + + LIST_HEAD(sdt_notes); + + ret = get_sdt_note_list(&sdt_notes, target); + if (!ret) + get_sdt_note_info(&sdt_notes, target); + else + sdt_err(ret, target); + + cleanup_sdt_note_list(&sdt_notes); + + return ret; +} + +/* + * print_sdt_notes() : wrapper function + */ +void print_sdt_events(const char *arg) +{ + if (arg) { + filename__find_sdt(arg); + return; + } + pr_err("Error : File Name must be specified with \"sdt\" option!\n" + "Usage :\n perf list sdt <file-name>\n"); + + return; +} -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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