[PATCH 3/5] perf header: Make feat_ops->print use processed result

[Namhyung Kim <namhyung@kernel.org>]

Now we have all of necessary information in the perf_header so just
use it for printing.

Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/header.c |  219 +++++++++++++++++++---------------------------
 1 file changed, 92 insertions(+), 127 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 1a30f2831616..9ab1803d601d 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -6,6 +6,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <linux/list.h>
 #include <linux/kernel.h>
 #include <linux/bitops.h>
@@ -972,118 +973,104 @@ 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->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->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->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->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->nr_cpus_online);
+	fprintf(fp, "# nrcpus avail : %u\n", ph->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->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;
 	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);
+	int i;
 
 	fprintf(fp, "# cmdline : ");
 
-	for (i = 0; i < nr; i++) {
-		str = do_read_string(fd, ph);
+	str = ph->cmdline;
+	for (i = 0; i < ph->cmdline_argc; i++) {
+		/* each argv is null-terminated */
 		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)
+#define TOPO_STR_DELIM ':'
+
+/* For string formatting, see process_cpu_topology() */
+static void print_cpu_topology(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	ssize_t ret;
 	u32 nr, i;
 	char *str;
+	char *delim;
 
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		return;
+	str = ph->cpu_topology;
 
-	if (ph->needs_swap)
-		nr = bswap_32(nr);
+	nr = strtoul(str, &delim, 0);
+	if (*delim != TOPO_STR_DELIM)
+		return;
 
+	str = delim + 1;
 	for (i = 0; i < nr; i++) {
-		str = do_read_string(fd, ph);
+		char c;
+
+		delim = strpbrk(str, ":\n");
+		if (!delim)
+			return;
+
+		c = *delim;
+		*delim = '\0';
 		fprintf(fp, "# sibling cores   : %s\n", str);
-		free(str);
+		*delim = c;
+
+		str = delim + 1;
 	}
 
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		return;
+	BUG_ON(*(str-1) != '\n');
 
-	if (ph->needs_swap)
-		nr = bswap_32(nr);
+	nr = strtoul(str, &delim, 0);
+	if (*delim != TOPO_STR_DELIM)
+		return;
 
+	str = delim + 1;
 	for (i = 0; i < nr; i++) {
-		str = do_read_string(fd, ph);
+		char c;
+
+		delim = strpbrk(str, ":\n");
+		if (!delim)
+			return;
+
+		c = *delim;
+		*delim = '\0';
 		fprintf(fp, "# sibling threads : %s\n", str);
-		free(str);
+		*delim = c;
+
+		str = delim + 1;
 	}
 }
 
@@ -1126,82 +1113,61 @@ static void print_event_desc(struct perf_header *ph, int fd __used, FILE *fp)
 	}
 }
 
-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 : %"PRIu64" kB\n", ph->total_mem);
 }
 
-static void print_numa_topology(struct perf_header *h __used, int fd, FILE *fp)
+/* For string formatting, see process_numa_topology() */
+static void print_numa_topology(struct perf_header *ph, int fd __used, FILE *fp)
 {
-	ssize_t ret;
-	u32 nr, c, i;
+	u32 nr, i, node;
+	u64 mem_total, mem_free;
 	char *str;
-	uint64_t mem_total, mem_free;
+	char *delim;
 
-	/* nr nodes */
-	ret = read(fd, &nr, sizeof(nr));
-	if (ret != (ssize_t)sizeof(nr))
-		goto error;
+	str = ph->numa_topology;
 
-	if (h->needs_swap)
-		nr = bswap_32(nr);
+	nr = strtoul(str, &delim, 0);
+	if (*delim != '\n')
+		return;
 
+	str = delim + 1;
 	for (i = 0; i < nr; i++) {
+		char c;
 
-		/* node number */
-		ret = read(fd, &c, sizeof(c));
-		if (ret != (ssize_t)sizeof(c))
-			goto error;
+		node = strtoul(str, &delim, 0);
+		if (*delim != TOPO_STR_DELIM)
+			return;
 
-		if (h->needs_swap)
-			c = bswap_32(c);
+		str = delim + 1;
+		mem_total = strtoull(str, &delim, 0);
+		if (*delim != TOPO_STR_DELIM)
+			return;
 
-		ret = read(fd, &mem_total, sizeof(u64));
-		if (ret != sizeof(u64))
-			goto error;
+		str = delim + 1;
+		mem_free = strtoull(str, &delim, 0);
+		if (*delim != TOPO_STR_DELIM)
+			return;
 
-		ret = read(fd, &mem_free, sizeof(u64));
-		if (ret != sizeof(u64))
-			goto error;
-
-		if (h->needs_swap) {
-			mem_total = bswap_64(mem_total);
-			mem_free = bswap_64(mem_free);
-		}
+		delim = strchr(str, '\n');
+		if (!delim)
+			return;
 
+		c = *delim;
+		*delim = '\0';
 		fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
-			    " free = %"PRIu64" kB\n",
-			c,
-			mem_total,
-			mem_free);
+			" free = %"PRIu64" kB\n", node, mem_total, mem_free);
+		fprintf(fp, "# node%u cpu list : %s\n", node, str);
+		*delim = c;
 
-		str = do_read_string(fd, h);
-		fprintf(fp, "# node%u cpu list : %s\n", c, str);
-		free(str);
+		str = delim + 1;
 	}
-	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->cpuid);
 }
 
 static void print_branch_stack(struct perf_header *ph __used, int fd __used,
@@ -1492,7 +1458,6 @@ error:
 }
 
 #define TOPO_STR_LEN  ((size_t) 256)
-#define TOPO_STR_DELIM ':'
 
 #define check_topo_len(topo, allocated, used, len)			\
 ({									\
-- 
1.7.9.2