[PATCH 0/7] perf header: Save and reuse feature information in header (v2)

[PATCH 0/7] perf header: Save and reuse feature information in header (v2)

[Namhyung Kim]

Hi,

This is a v2 of my perf header cleanup series.  The v1 can be found
here [1].

Currently the perf header information is used only at initial setup
time and discarded.  If it's saved we could reuse the information for
various purpose in the future.

The patch 1-3 are cleanups so that they can be applied independently.

I also put the series on my tree at:

  git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git  perf/header-v2

Any comments are welcome, thanks.
Namhyung

[1] https://lkml.org/lkml/2012/7/21/75

v1 -> v2:
 * not touch EVENT_DESC feature handling
 * split out struct perf_header_info
 * simplify multi-string handling
 * add some cleanup patches


Namhyung Kim (7):
  perf header: Use evlist->nr_entries on write_event_desc()
  perf header: Set tracepoint event name only if not set
  perf header: Swap pmu mapping numbers if needed
  perf header: Add struct perf_header_info
  perf header: Add ->process callbacks to most of features
  perf header: Use pre-processed header info when printing
  perf header: Remove unused @feat arg from ->process callback

 tools/perf/util/header.c | 528 +++++++++++++++++++++++++++++++++--------------
 tools/perf/util/header.h |  24 +++
 2 files changed, 393 insertions(+), 159 deletions(-)

-- 
1.7.11.4

[PATCH 1/7] perf header: Use evlist->nr_entries on write_event_desc()

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

Number of events (evsels) in a evlist is kept on nr_entries field
so that we don't need to recalculate it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9696e64c9dbd..a124b9328170 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -610,11 +610,10 @@ static int write_event_desc(int fd, struct perf_header *h __used,
 			    struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel;
-	u32 nre = 0, nri, sz;
+	u32 nre, nri, sz;
 	int ret;
 
-	list_for_each_entry(evsel, &evlist->entries, node)
-		nre++;
+	nre = evlist->nr_entries;
 
 	/*
 	 * write number of events
-- 
1.7.11.4

[PATCH 2/7] perf header: Set tracepoint event name only if not set

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

The event name can be set already by processing a event_desc data.
So check it before setting to prevent possible leak.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index a124b9328170..05c9310c3da1 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2314,7 +2314,7 @@ static int perf_evlist__set_tracepoint_names(struct perf_evlist *evlist,
 	struct perf_evsel *pos;
 
 	list_for_each_entry(pos, &evlist->entries, node) {
-		if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
+		if (pos->attr.type == PERF_TYPE_TRACEPOINT && !pos->name &&
 		    perf_evsel__set_tracepoint_name(pos, pevent))
 			return -1;
 	}
-- 
1.7.11.4

[PATCH 3/7] perf header: Swap pmu mapping numbers if needed

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

Like others, the numbers can be saved in a different endian format
than a host machine.  Swap them if needed.

Cc: Robert Richter <robert.richter@amd.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 05c9310c3da1..43425b75f0c9 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1440,6 +1440,9 @@ static void print_pmu_mappings(struct perf_header *ph, int fd, FILE *fp)
 	if (ret != sizeof(pmu_num))
 		goto error;
 
+	if (ph->needs_swap)
+		pmu_num = bswap_32(pmu_num);
+
 	if (!pmu_num) {
 		fprintf(fp, "# pmu mappings: not available\n");
 		return;
@@ -1448,6 +1451,9 @@ static void print_pmu_mappings(struct perf_header *ph, int fd, FILE *fp)
 	while (pmu_num) {
 		if (read(fd, &type, sizeof(type)) != sizeof(type))
 			break;
+		if (ph->needs_swap)
+			type = bswap_32(type);
+
 		name = do_read_string(fd, ph);
 		if (!name)
 			break;
-- 
1.7.11.4

[PATCH 4/7] perf header: Add struct perf_header_info

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

The struct perf_header_info will preserve environment information at
the time of perf record.  It can be accessed anytime after parsing a
perf.data file if needed.

Cc: Stephane Eranian <eranian@google.com>
Cc: Robert Richter <robert.richter@amd.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 9d5eedceda72..420403b57307 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -58,6 +58,29 @@ struct perf_header;
 int perf_file_header__read(struct perf_file_header *header,
 			   struct perf_header *ph, int fd);
 
+struct perf_header_info {
+	char			*hostname;
+	char			*os_release;
+	char			*version;
+	char			*arch;
+	int			nr_cpus_online;
+	int			nr_cpus_avail;
+	char			*cpu_desc;
+	char			*cpuid;
+	unsigned long long	total_mem;
+
+	int			nr_cmdline;
+	char			*cmdline;
+	int			nr_sibling_cores;
+	char			*sibling_cores;
+	int			nr_sibling_threads;
+	char			*sibling_threads;
+	int			nr_numa_nodes;
+	char			*numa_nodes;
+	int			nr_pmu_mappings;
+	char			*pmu_mappings;
+};
+
 struct perf_header {
 	int			frozen;
 	bool			needs_swap;
@@ -67,6 +90,7 @@ struct perf_header {
 	u64			event_offset;
 	u64			event_size;
 	DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
+	struct perf_header_info info;
 };
 
 struct perf_evlist;
-- 
1.7.11.4

[PATCH 5/7] perf header: Add ->process callbacks to most of features

[Namhyung Kim]

>From now on each feature information is processed and saved in perf
header so that it can be used wherever needed.  The BRANCH_STACK
feature is an exception since it needs nothing to be done.

Cc: Stephane Eranian <eranian@google.com>
Cc: Robert Richter <robert.richter@amd.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.c | 318 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 307 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 43425b75f0c9..9c6ab1b52a07 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -21,6 +21,7 @@
 #include "debug.h"
 #include "cpumap.h"
 #include "pmu.h"
+#include "strbuf.h"
 
 static bool no_buildid_cache = false;
 
@@ -1638,6 +1639,99 @@ static int process_build_id(struct perf_file_section *section,
 	return 0;
 }
 
+static int process_hostname(struct perf_file_section *section __unused,
+			    struct perf_header *ph,
+			    int feat __unused, int fd, void *data __used)
+{
+	ph->info.hostname = do_read_string(fd, ph);
+	return ph->info.hostname ? 0 : -ENOMEM;
+}
+
+static int process_osrelease(struct perf_file_section *section __unused,
+			     struct perf_header *ph,
+			     int feat __unused, int fd, void *data __used)
+{
+	ph->info.os_release = do_read_string(fd, ph);
+	return ph->info.os_release ? 0 : -ENOMEM;
+}
+
+static int process_version(struct perf_file_section *section __unused,
+			   struct perf_header *ph,
+			   int feat __unused, int fd, void *data __used)
+{
+	ph->info.version = do_read_string(fd, ph);
+	return ph->info.version ? 0 : -ENOMEM;
+}
+
+static int process_arch(struct perf_file_section *section __unused,
+			struct perf_header *ph,
+			int feat __unused, int fd, void *data __used)
+{
+	ph->info.arch = do_read_string(fd, ph);
+	return ph->info.arch ? 0 : -ENOMEM;
+}
+
+static int process_nrcpus(struct perf_file_section *section __unused,
+			  struct perf_header *ph,
+			  int feat __unused, int fd, void *data __used)
+{
+	size_t ret;
+	u32 nr;
+
+	ret = read(fd, &nr, sizeof(nr));
+	if (ret != sizeof(nr))
+		return -1;
+
+	if (ph->needs_swap)
+		nr = bswap_32(nr);
+
+	ph->info.nr_cpus_online = nr;
+
+	ret = read(fd, &nr, sizeof(nr));
+	if (ret != sizeof(nr))
+		return -1;
+
+	if (ph->needs_swap)
+		nr = bswap_32(nr);
+
+	ph->info.nr_cpus_avail = nr;
+	return 0;
+}
+
+static int process_cpudesc(struct perf_file_section *section __unused,
+			   struct perf_header *ph,
+			   int feat __unused, int fd, void *data __used)
+{
+	ph->info.cpu_desc = do_read_string(fd, ph);
+	return ph->info.cpu_desc ? 0 : -ENOMEM;
+}
+
+static int process_cpuid(struct perf_file_section *section __unused,
+			 struct perf_header *ph,
+			 int feat __unused, int fd, void *data __used)
+{
+	ph->info.cpuid = do_read_string(fd, ph);
+	return ph->info.cpuid ? 0 : -ENOMEM;
+}
+
+static int process_total_mem(struct perf_file_section *section __unused,
+			     struct perf_header *ph,
+			     int feat __unused, int fd, void *data __used)
+{
+	uint64_t mem;
+	size_t ret;
+
+	ret = read(fd, &mem, sizeof(mem));
+	if (ret != sizeof(mem))
+		return -1;
+
+	if (ph->needs_swap)
+		mem = bswap_64(mem);
+
+	ph->info.total_mem = mem;
+	return 0;
+}
+
 static struct perf_evsel *
 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
 {
@@ -1688,6 +1782,208 @@ process_event_desc(struct perf_file_section *section __unused,
 	return 0;
 }
 
+static int process_cmdline(struct perf_file_section *section __unused,
+			   struct perf_header *ph,
+			   int feat __unused, int fd, void *data __used)
+{
+	size_t ret;
+	char *str;
+	u32 nr, i;
+	struct strbuf sb;
+
+	ret = read(fd, &nr, sizeof(nr));
+	if (ret != sizeof(nr))
+		return -1;
+
+	if (ph->needs_swap)
+		nr = bswap_32(nr);
+
+	ph->info.nr_cmdline = nr;
+	strbuf_init(&sb, 128);
+
+	for (i = 0; i < nr; i++) {
+		str = do_read_string(fd, ph);
+		if (!str)
+			goto error;
+
+		/* include a NULL character at the end */
+		strbuf_add(&sb, str, strlen(str) + 1);
+		free(str);
+	}
+	ph->info.cmdline = strbuf_detach(&sb, NULL);
+	return 0;
+
+error:
+	strbuf_release(&sb);
+	return -1;
+}
+
+static int process_cpu_topology(struct perf_file_section *section __unused,
+				struct perf_header *ph,
+				int feat __unused, int fd, void *data __used)
+{
+	size_t ret;
+	u32 nr, i;
+	char *str;
+	struct strbuf sb;
+
+	ret = read(fd, &nr, sizeof(nr));
+	if (ret != sizeof(nr))
+		return -1;
+
+	if (ph->needs_swap)
+		nr = bswap_32(nr);
+
+	ph->info.nr_sibling_cores = nr;
+	strbuf_init(&sb, 128);
+
+	for (i = 0; i < nr; i++) {
+		str = do_read_string(fd, ph);
+		if (!str)
+			goto error;
+
+		/* include a NULL character at the end */
+		strbuf_add(&sb, str, strlen(str) + 1);
+		free(str);
+	}
+	ph->info.sibling_cores = strbuf_detach(&sb, NULL);
+
+	ret = read(fd, &nr, sizeof(nr));
+	if (ret != sizeof(nr))
+		return -1;
+
+	if (ph->needs_swap)
+		nr = bswap_32(nr);
+
+	ph->info.nr_sibling_threads = nr;
+
+	for (i = 0; i < nr; i++) {
+		str = do_read_string(fd, ph);
+		if (!str)
+			goto error;
+
+		/* include a NULL character at the end */
+		strbuf_add(&sb, str, strlen(str) + 1);
+		free(str);
+	}
+	ph->info.sibling_threads = strbuf_detach(&sb, NULL);
+	return 0;
+
+error:
+	strbuf_release(&sb);
+	return -1;
+}
+
+static int process_numa_topology(struct perf_file_section *section __unused,
+				 struct perf_header *ph,
+				 int feat __unused, int fd, void *data __used)
+{
+	size_t ret;
+	u32 nr, node, i;
+	char *str;
+	uint64_t mem_total, mem_free;
+	struct strbuf sb;
+
+	/* nr nodes */
+	ret = read(fd, &nr, sizeof(nr));
+	if (ret != sizeof(nr))
+		goto error;
+
+	if (ph->needs_swap)
+		nr = bswap_32(nr);
+
+	ph->info.nr_numa_nodes = nr;
+	strbuf_init(&sb, 256);
+
+	for (i = 0; i < nr; i++) {
+		/* node number */
+		ret = read(fd, &node, sizeof(node));
+		if (ret != sizeof(node))
+			goto error;
+
+		ret = read(fd, &mem_total, sizeof(u64));
+		if (ret != sizeof(u64))
+			goto error;
+
+		ret = read(fd, &mem_free, sizeof(u64));
+		if (ret != sizeof(u64))
+			goto error;
+
+		if (ph->needs_swap) {
+			node = bswap_32(node);
+			mem_total = bswap_64(mem_total);
+			mem_free = bswap_64(mem_free);
+		}
+
+		strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
+			    node, mem_total, mem_free);
+
+		str = do_read_string(fd, ph);
+		if (!str)
+			goto error;
+
+		/* include a NULL character at the end */
+		strbuf_add(&sb, str, strlen(str) + 1);
+		free(str);
+	}
+	ph->info.numa_nodes = strbuf_detach(&sb, NULL);
+	return 0;
+
+error:
+	strbuf_release(&sb);
+	return -1;
+}
+
+static int process_pmu_mappings(struct perf_file_section *section __unused,
+				struct perf_header *ph,
+				int feat __unused, int fd, void *data __used)
+{
+	size_t ret;
+	char *name;
+	u32 pmu_num;
+	u32 type;
+	struct strbuf sb;
+
+	ret = read(fd, &pmu_num, sizeof(pmu_num));
+	if (ret != sizeof(pmu_num))
+		return -1;
+
+	if (ph->needs_swap)
+		pmu_num = bswap_32(pmu_num);
+
+	if (!pmu_num) {
+		pr_debug("pmu mappings not available\n");
+		return 0;
+	}
+
+	ph->info.nr_pmu_mappings = pmu_num;
+	strbuf_init(&sb, 128);
+
+	while (pmu_num) {
+		if (read(fd, &type, sizeof(type)) != sizeof(type))
+			goto error;
+		if (ph->needs_swap)
+			type = bswap_32(type);
+
+		name = do_read_string(fd, ph);
+		if (!name)
+			goto error;
+
+		strbuf_addf(&sb, "%u:%s", type, name);
+		/* include a NULL character at the end */
+		strbuf_add(&sb, "", 1);
+
+		free(name);
+		pmu_num--;
+	}
+	ph->info.pmu_mappings = strbuf_detach(&sb, NULL);
+	return 0;
+
+error:
+	strbuf_release(&sb);
+	return -1;
+}
+
 struct feature_ops {
 	int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
 	void (*print)(struct perf_header *h, int fd, FILE *fp);
@@ -1704,7 +2000,7 @@ struct feature_ops {
 		.process = process_##func }
 #define FEAT_OPF(n, func) \
 	[n] = { .name = #n, .write = write_##func, .print = print_##func, \
-		.full_only = true }
+		.process = process_##func, .full_only = true }
 
 /* feature_ops not implemented: */
 #define print_tracing_data	NULL
@@ -1713,20 +2009,20 @@ struct feature_ops {
 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
 	FEAT_OPP(HEADER_TRACING_DATA,	tracing_data),
 	FEAT_OPP(HEADER_BUILD_ID,	build_id),
-	FEAT_OPA(HEADER_HOSTNAME,	hostname),
-	FEAT_OPA(HEADER_OSRELEASE,	osrelease),
-	FEAT_OPA(HEADER_VERSION,	version),
-	FEAT_OPA(HEADER_ARCH,		arch),
-	FEAT_OPA(HEADER_NRCPUS,		nrcpus),
-	FEAT_OPA(HEADER_CPUDESC,	cpudesc),
-	FEAT_OPA(HEADER_CPUID,		cpuid),
-	FEAT_OPA(HEADER_TOTAL_MEM,	total_mem),
+	FEAT_OPP(HEADER_HOSTNAME,	hostname),
+	FEAT_OPP(HEADER_OSRELEASE,	osrelease),
+	FEAT_OPP(HEADER_VERSION,	version),
+	FEAT_OPP(HEADER_ARCH,		arch),
+	FEAT_OPP(HEADER_NRCPUS,		nrcpus),
+	FEAT_OPP(HEADER_CPUDESC,	cpudesc),
+	FEAT_OPP(HEADER_CPUID,		cpuid),
+	FEAT_OPP(HEADER_TOTAL_MEM,	total_mem),
 	FEAT_OPP(HEADER_EVENT_DESC,	event_desc),
-	FEAT_OPA(HEADER_CMDLINE,	cmdline),
+	FEAT_OPP(HEADER_CMDLINE,	cmdline),
 	FEAT_OPF(HEADER_CPU_TOPOLOGY,	cpu_topology),
 	FEAT_OPF(HEADER_NUMA_TOPOLOGY,	numa_topology),
 	FEAT_OPA(HEADER_BRANCH_STACK,	branch_stack),
-	FEAT_OPA(HEADER_PMU_MAPPINGS,	pmu_mappings),
+	FEAT_OPP(HEADER_PMU_MAPPINGS,	pmu_mappings),
 };
 
 struct header_print_data {
-- 
1.7.11.4

[PATCH 6/7] perf header: Use pre-processed header info when printing

[Namhyung Kim]

>From now on each feature information is processed and saved in perf
header so that it can be used for printing.  The event desc and branch
stack features are not touched since they're not saved.

Cc: Stephane Eranian <eranian@google.com>
Cc: Robert Richter <robert.richter@amd.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.c | 196 ++++++++++++++---------------------------------
 1 file changed, 57 insertions(+), 139 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9c6ab1b52a07..2cc0954d984c 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1073,118 +1073,73 @@ static int write_branch_stack(int fd __used, struct perf_header *h __used,
 	return 0;
 }
 
-static void print_hostname(struct perf_header *ph, int fd, FILE *fp)
+static void print_hostname(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	char *str = do_read_string(fd, ph);
-	fprintf(fp, "# hostname : %s\n", str);
-	free(str);
+	fprintf(fp, "# hostname : %s\n", ph->info.hostname);
 }
 
-static void print_osrelease(struct perf_header *ph, int fd, FILE *fp)
+static void print_osrelease(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	char *str = do_read_string(fd, ph);
-	fprintf(fp, "# os release : %s\n", str);
-	free(str);
+	fprintf(fp, "# os release : %s\n", ph->info.os_release);
 }
 
-static void print_arch(struct perf_header *ph, int fd, FILE *fp)
+static void print_arch(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	char *str = do_read_string(fd, ph);
-	fprintf(fp, "# arch : %s\n", str);
-	free(str);
+	fprintf(fp, "# arch : %s\n", ph->info.arch);
 }
 
-static void print_cpudesc(struct perf_header *ph, int fd, FILE *fp)
+static void print_cpudesc(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	char *str = do_read_string(fd, ph);
-	fprintf(fp, "# cpudesc : %s\n", str);
-	free(str);
+	fprintf(fp, "# cpudesc : %s\n", ph->info.cpu_desc);
 }
 
-static void print_nrcpus(struct perf_header *ph, int fd, FILE *fp)
+static void print_nrcpus(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	ssize_t ret;
-	u32 nr;
-
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		nr = -1; /* interpreted as error */
-
-	if (ph->needs_swap)
-		nr = bswap_32(nr);
-
-	fprintf(fp, "# nrcpus online : %u\n", nr);
-
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		nr = -1; /* interpreted as error */
-
-	if (ph->needs_swap)
-		nr = bswap_32(nr);
-
-	fprintf(fp, "# nrcpus avail : %u\n", nr);
+	fprintf(fp, "# nrcpus online : %u\n", ph->info.nr_cpus_online);
+	fprintf(fp, "# nrcpus avail : %u\n", ph->info.nr_cpus_avail);
 }
 
-static void print_version(struct perf_header *ph, int fd, FILE *fp)
+static void print_version(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	char *str = do_read_string(fd, ph);
-	fprintf(fp, "# perf version : %s\n", str);
-	free(str);
+	fprintf(fp, "# perf version : %s\n", ph->info.version);
 }
 
-static void print_cmdline(struct perf_header *ph, int fd, FILE *fp)
+static void print_cmdline(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	ssize_t ret;
+	int nr, i;
 	char *str;
-	u32 nr, i;
 
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		return;
-
-	if (ph->needs_swap)
-		nr = bswap_32(nr);
+	nr = ph->info.nr_cmdline;
+	str = ph->info.cmdline;
 
 	fprintf(fp, "# cmdline : ");
 
 	for (i = 0; i < nr; i++) {
-		str = do_read_string(fd, ph);
 		fprintf(fp, "%s ", str);
-		free(str);
+		str += strlen(str) + 1;
 	}
 	fputc('\n', fp);
 }
 
-static void print_cpu_topology(struct perf_header *ph, int fd, FILE *fp)
+static void print_cpu_topology(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	ssize_t ret;
-	u32 nr, i;
+	int nr, i;
 	char *str;
 
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		return;
-
-	if (ph->needs_swap)
-		nr = bswap_32(nr);
+	nr = ph->info.nr_sibling_cores;
+	str = ph->info.sibling_cores;
 
 	for (i = 0; i < nr; i++) {
-		str = do_read_string(fd, ph);
 		fprintf(fp, "# sibling cores   : %s\n", str);
-		free(str);
+		str += strlen(str) + 1;
 	}
 
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		return;
-
-	if (ph->needs_swap)
-		nr = bswap_32(nr);
+	nr = ph->info.nr_sibling_threads;
+	str = ph->info.sibling_threads;
 
 	for (i = 0; i < nr; i++) {
-		str = do_read_string(fd, ph);
 		fprintf(fp, "# sibling threads : %s\n", str);
-		free(str);
+		str += strlen(str) + 1;
 	}
 }
 
@@ -1345,82 +1300,52 @@ static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
 	free_event_desc(events);
 }
 
-static void print_total_mem(struct perf_header *h __used, int fd, FILE *fp)
+static void print_total_mem(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	uint64_t mem;
-	ssize_t ret;
-
-	ret = read(fd, &mem, sizeof(mem));
-	if (ret != sizeof(mem))
-		goto error;
-
-	if (h->needs_swap)
-		mem = bswap_64(mem);
-
-	fprintf(fp, "# total memory : %"PRIu64" kB\n", mem);
-	return;
-error:
-	fprintf(fp, "# total memory : unknown\n");
+	fprintf(fp, "# total memory : %Lu kB\n", ph->info.total_mem);
 }
 
-static void print_numa_topology(struct perf_header *h __used, int fd, FILE *fp)
+static void print_numa_topology(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	ssize_t ret;
 	u32 nr, c, i;
-	char *str;
+	char *str, *tmp;
 	uint64_t mem_total, mem_free;
 
 	/* nr nodes */
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		goto error;
-
-	if (h->needs_swap)
-		nr = bswap_32(nr);
+	nr = ph->info.nr_numa_nodes;
+	str = ph->info.numa_nodes;
 
 	for (i = 0; i < nr; i++) {
-
 		/* node number */
-		ret = read(fd, &c, sizeof(c));
-		if (ret != (ssize_t)sizeof(c))
+		c = strtoul(str, &tmp, 0);
+		if (*tmp != ':')
 			goto error;
 
-		if (h->needs_swap)
-			c = bswap_32(c);
-
-		ret = read(fd, &mem_total, sizeof(u64));
-		if (ret != sizeof(u64))
+		str = tmp + 1;
+		mem_total = strtoull(str, &tmp, 0);
+		if (*tmp != ':')
 			goto error;
 
-		ret = read(fd, &mem_free, sizeof(u64));
-		if (ret != sizeof(u64))
+		str = tmp + 1;
+		mem_free = strtoull(str, &tmp, 0);
+		if (*tmp != ':')
 			goto error;
 
-		if (h->needs_swap) {
-			mem_total = bswap_64(mem_total);
-			mem_free = bswap_64(mem_free);
-		}
-
 		fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
 			    " free = %"PRIu64" kB\n",
-			c,
-			mem_total,
-			mem_free);
+			c, mem_total, mem_free);
 
-		str = do_read_string(fd, h);
+		str = tmp + 1;
 		fprintf(fp, "# node%u cpu list : %s\n", c, str);
-		free(str);
 	}
 	return;
 error:
 	fprintf(fp, "# numa topology : not available\n");
 }
 
-static void print_cpuid(struct perf_header *ph, int fd, FILE *fp)
+static void print_cpuid(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	char *str = do_read_string(fd, ph);
-	fprintf(fp, "# cpuid : %s\n", str);
-	free(str);
+	fprintf(fp, "# cpuid : %s\n", ph->info.cpuid);
 }
 
 static void print_branch_stack(struct perf_header *ph __used, int fd __used,
@@ -1429,39 +1354,32 @@ static void print_branch_stack(struct perf_header *ph __used, int fd __used,
 	fprintf(fp, "# contains samples with branch stack\n");
 }
 
-static void print_pmu_mappings(struct perf_header *ph, int fd, FILE *fp)
+static void print_pmu_mappings(struct perf_header *ph, int fd __used, FILE *fp)
 {
 	const char *delimiter = "# pmu mappings: ";
-	char *name;
-	int ret;
+	char *str, *tmp;
 	u32 pmu_num;
 	u32 type;
 
-	ret = read(fd, &pmu_num, sizeof(pmu_num));
-	if (ret != sizeof(pmu_num))
-		goto error;
-
-	if (ph->needs_swap)
-		pmu_num = bswap_32(pmu_num);
-
+	pmu_num = ph->info.nr_pmu_mappings;
 	if (!pmu_num) {
 		fprintf(fp, "# pmu mappings: not available\n");
 		return;
 	}
 
+	str = ph->info.pmu_mappings;
+
 	while (pmu_num) {
-		if (read(fd, &type, sizeof(type)) != sizeof(type))
-			break;
-		if (ph->needs_swap)
-			type = bswap_32(type);
+		type = strtoul(str, &tmp, 0);
+		if (*tmp != ':')
+			goto error;
+
+		str = tmp + 1;
+		fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
 
-		name = do_read_string(fd, ph);
-		if (!name)
-			break;
-		pmu_num--;
-		fprintf(fp, "%s%s = %" PRIu32, delimiter, name, type);
-		free(name);
 		delimiter = ", ";
+		str += strlen(str) + 1;
+		pmu_num--;
 	}
 
 	fprintf(fp, "\n");
-- 
1.7.11.4

[PATCH 7/7] perf header: Remove unused @feat arg from ->process callback

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

As the @feat arg is not used anywhere, get rid of it from the signature.

Cc: Stephane Eranian <eranian@google.com>
Cc: Robert Richter <robert.richter@amd.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.c | 59 ++++++++++++++++++++----------------------------
 1 file changed, 25 insertions(+), 34 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 2cc0954d984c..06ecd577d1b8 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1541,16 +1541,15 @@ out:
 }
 
 static int process_tracing_data(struct perf_file_section *section __unused,
-			      struct perf_header *ph __unused,
-			      int feat __unused, int fd, void *data)
+				struct perf_header *ph __unused, int fd,
+				void *data)
 {
 	trace_report(fd, data, false);
 	return 0;
 }
 
 static int process_build_id(struct perf_file_section *section,
-			    struct perf_header *ph,
-			    int feat __unused, int fd, void *data __used)
+			    struct perf_header *ph, int fd, void *data __used)
 {
 	if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
 		pr_debug("Failed to read buildids, continuing...\n");
@@ -1558,40 +1557,35 @@ static int process_build_id(struct perf_file_section *section,
 }
 
 static int process_hostname(struct perf_file_section *section __unused,
-			    struct perf_header *ph,
-			    int feat __unused, int fd, void *data __used)
+			    struct perf_header *ph, int fd, void *data __used)
 {
 	ph->info.hostname = do_read_string(fd, ph);
 	return ph->info.hostname ? 0 : -ENOMEM;
 }
 
 static int process_osrelease(struct perf_file_section *section __unused,
-			     struct perf_header *ph,
-			     int feat __unused, int fd, void *data __used)
+			     struct perf_header *ph, int fd, void *data __used)
 {
 	ph->info.os_release = do_read_string(fd, ph);
 	return ph->info.os_release ? 0 : -ENOMEM;
 }
 
 static int process_version(struct perf_file_section *section __unused,
-			   struct perf_header *ph,
-			   int feat __unused, int fd, void *data __used)
+			   struct perf_header *ph, int fd, void *data __used)
 {
 	ph->info.version = do_read_string(fd, ph);
 	return ph->info.version ? 0 : -ENOMEM;
 }
 
 static int process_arch(struct perf_file_section *section __unused,
-			struct perf_header *ph,
-			int feat __unused, int fd, void *data __used)
+			struct perf_header *ph, int fd, void *data __used)
 {
 	ph->info.arch = do_read_string(fd, ph);
 	return ph->info.arch ? 0 : -ENOMEM;
 }
 
 static int process_nrcpus(struct perf_file_section *section __unused,
-			  struct perf_header *ph,
-			  int feat __unused, int fd, void *data __used)
+			  struct perf_header *ph, int fd, void *data __used)
 {
 	size_t ret;
 	u32 nr;
@@ -1617,24 +1611,21 @@ static int process_nrcpus(struct perf_file_section *section __unused,
 }
 
 static int process_cpudesc(struct perf_file_section *section __unused,
-			   struct perf_header *ph,
-			   int feat __unused, int fd, void *data __used)
+			   struct perf_header *ph, int fd, void *data __used)
 {
 	ph->info.cpu_desc = do_read_string(fd, ph);
 	return ph->info.cpu_desc ? 0 : -ENOMEM;
 }
 
 static int process_cpuid(struct perf_file_section *section __unused,
-			 struct perf_header *ph,
-			 int feat __unused, int fd, void *data __used)
+			 struct perf_header *ph, int fd, void *data __used)
 {
 	ph->info.cpuid = do_read_string(fd, ph);
 	return ph->info.cpuid ? 0 : -ENOMEM;
 }
 
 static int process_total_mem(struct perf_file_section *section __unused,
-			     struct perf_header *ph,
-			     int feat __unused, int fd, void *data __used)
+			     struct perf_header *ph, int fd, void *data __used)
 {
 	uint64_t mem;
 	size_t ret;
@@ -1664,7 +1655,8 @@ perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
 }
 
 static void
-perf_evlist__set_event_name(struct perf_evlist *evlist, struct perf_evsel *event)
+perf_evlist__set_event_name(struct perf_evlist *evlist,
+			    struct perf_evsel *event)
 {
 	struct perf_evsel *evsel;
 
@@ -1683,15 +1675,15 @@ perf_evlist__set_event_name(struct perf_evlist *evlist, struct perf_evsel *event
 
 static int
 process_event_desc(struct perf_file_section *section __unused,
-		   struct perf_header *header, int feat __unused, int fd,
-		   void *data __used)
+		   struct perf_header *header, int fd, void *data __used)
 {
-	struct perf_session *session = container_of(header, struct perf_session, header);
+	struct perf_session *session;
 	struct perf_evsel *evsel, *events = read_event_desc(header, fd);
 
 	if (!events)
 		return 0;
 
+	session = container_of(header, struct perf_session, header);
 	for (evsel = events; evsel->attr.size; evsel++)
 		perf_evlist__set_event_name(session->evlist, evsel);
 
@@ -1701,8 +1693,7 @@ process_event_desc(struct perf_file_section *section __unused,
 }
 
 static int process_cmdline(struct perf_file_section *section __unused,
-			   struct perf_header *ph,
-			   int feat __unused, int fd, void *data __used)
+			   struct perf_header *ph, int fd, void *data __used)
 {
 	size_t ret;
 	char *str;
@@ -1737,8 +1728,8 @@ error:
 }
 
 static int process_cpu_topology(struct perf_file_section *section __unused,
-				struct perf_header *ph,
-				int feat __unused, int fd, void *data __used)
+				struct perf_header *ph, int fd,
+				void *data __used)
 {
 	size_t ret;
 	u32 nr, i;
@@ -1793,8 +1784,8 @@ error:
 }
 
 static int process_numa_topology(struct perf_file_section *section __unused,
-				 struct perf_header *ph,
-				 int feat __unused, int fd, void *data __used)
+				 struct perf_header *ph, int fd,
+				 void *data __used)
 {
 	size_t ret;
 	u32 nr, node, i;
@@ -1853,8 +1844,8 @@ error:
 }
 
 static int process_pmu_mappings(struct perf_file_section *section __unused,
-				struct perf_header *ph,
-				int feat __unused, int fd, void *data __used)
+				struct perf_header *ph, int fd,
+				void *data __used)
 {
 	size_t ret;
 	char *name;
@@ -1906,7 +1897,7 @@ struct feature_ops {
 	int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
 	void (*print)(struct perf_header *h, int fd, FILE *fp);
 	int (*process)(struct perf_file_section *section,
-		       struct perf_header *h, int feat, int fd, void *data);
+		       struct perf_header *h, int fd, void *data);
 	const char *name;
 	bool full_only;
 };
@@ -2420,7 +2411,7 @@ static int perf_file_section__process(struct perf_file_section *section,
 	if (!feat_ops[feat].process)
 		return 0;
 
-	return feat_ops[feat].process(section, ph, feat, fd, data);
+	return feat_ops[feat].process(section, ph, fd, data);
 }
 
 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
-- 
1.7.11.4

[tip:perf/core] perf header: Use evlist-> nr_entries on write_event_desc()

[tip-bot for Namhyung Kim]

Commit-ID:  74ba9e11f02a4ce0c7708dc77d1756b93065e440
Gitweb:     http://git.kernel.org/tip/74ba9e11f02a4ce0c7708dc77d1756b93065e440
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Wed, 5 Sep 2012 14:02:47 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 5 Sep 2012 17:46:03 -0300

perf header: Use evlist->nr_entries on write_event_desc()

Number of events (evsels) in a evlist is kept on nr_entries field
so that we don't need to recalculate it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1346821373-31621-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/header.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9696e64..a124b93 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -610,11 +610,10 @@ static int write_event_desc(int fd, struct perf_header *h __used,
 			    struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel;
-	u32 nre = 0, nri, sz;
+	u32 nre, nri, sz;
 	int ret;
 
-	list_for_each_entry(evsel, &evlist->entries, node)
-		nre++;
+	nre = evlist->nr_entries;
 
 	/*
 	 * write number of events

[tip:perf/core] perf header: Set tracepoint event name only if not set

[tip-bot for Namhyung Kim]

Commit-ID:  618a3f1d30ea0ee2ff3a88661b8d6a4035123211
Gitweb:     http://git.kernel.org/tip/618a3f1d30ea0ee2ff3a88661b8d6a4035123211
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Wed, 5 Sep 2012 14:02:48 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 5 Sep 2012 17:46:34 -0300

perf header: Set tracepoint event name only if not set

The event name can be set already by processing a event_desc data.

So check it before setting to prevent possible leak.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1346821373-31621-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/header.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index a124b93..05c9310 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2314,7 +2314,7 @@ static int perf_evlist__set_tracepoint_names(struct perf_evlist *evlist,
 	struct perf_evsel *pos;
 
 	list_for_each_entry(pos, &evlist->entries, node) {
-		if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
+		if (pos->attr.type == PERF_TYPE_TRACEPOINT && !pos->name &&
 		    perf_evsel__set_tracepoint_name(pos, pevent))
 			return -1;
 	}

[tip:perf/core] perf header: Swap pmu mapping numbers if needed

[tip-bot for Namhyung Kim]

Commit-ID:  be4a2dedf6816871349fbddd018f266e93e3c22d
Gitweb:     http://git.kernel.org/tip/be4a2dedf6816871349fbddd018f266e93e3c22d
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Wed, 5 Sep 2012 14:02:49 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 5 Sep 2012 17:47:11 -0300

perf header: Swap pmu mapping numbers if needed

Like others, the numbers can be saved in a different endian format than
a host machine.  Swap them if needed.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Link: http://lkml.kernel.org/r/1346821373-31621-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/header.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 05c9310..43425b7 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1440,6 +1440,9 @@ static void print_pmu_mappings(struct perf_header *ph, int fd, FILE *fp)
 	if (ret != sizeof(pmu_num))
 		goto error;
 
+	if (ph->needs_swap)
+		pmu_num = bswap_32(pmu_num);
+
 	if (!pmu_num) {
 		fprintf(fp, "# pmu mappings: not available\n");
 		return;
@@ -1448,6 +1451,9 @@ static void print_pmu_mappings(struct perf_header *ph, int fd, FILE *fp)
 	while (pmu_num) {
 		if (read(fd, &type, sizeof(type)) != sizeof(type))
 			break;
+		if (ph->needs_swap)
+			type = bswap_32(type);
+
 		name = do_read_string(fd, ph);
 		if (!name)
 			break;