[tip:perf/core] perf machine: Move kernel mmap name into struct machine

[tip-bot for Jiri Olsa]

Commit-ID:  8c7f1bb37b29f140e08175132f3abb4d5ad229fc
Gitweb:     https://git.kernel.org/tip/8c7f1bb37b29f140e08175132f3abb4d5ad229fc
Author:     Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Thu, 15 Feb 2018 13:26:30 +0100
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 16 Feb 2018 14:25:57 -0300

perf machine: Move kernel mmap name into struct machine

It simplifies and centralizes the code. The kernel mmap name is set for
machine type, which we know from the beginning, so there's no reason to
generate it every time we need it.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20180215122635.24029-5-jolsa@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/build-id.c | 10 +++----
 tools/perf/util/event.c    |  5 +---
 tools/perf/util/machine.c  | 67 +++++++++++++++++++++++-----------------------
 tools/perf/util/machine.h  |  3 +--
 tools/perf/util/symbol.c   |  3 +--
 5 files changed, 39 insertions(+), 49 deletions(-)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 7f85536..537eadd 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -316,7 +316,6 @@ static int machine__write_buildid_table(struct machine *machine,
 					struct feat_fd *fd)
 {
 	int err = 0;
-	char nm[PATH_MAX];
 	struct dso *pos;
 	u16 kmisc = PERF_RECORD_MISC_KERNEL,
 	    umisc = PERF_RECORD_MISC_USER;
@@ -338,9 +337,8 @@ static int machine__write_buildid_table(struct machine *machine,
 			name = pos->short_name;
 			name_len = pos->short_name_len;
 		} else if (dso__is_kcore(pos)) {
-			machine__mmap_name(machine, nm, sizeof(nm));
-			name = nm;
-			name_len = strlen(nm);
+			name = machine->mmap_name;
+			name_len = strlen(name);
 		} else {
 			name = pos->long_name;
 			name_len = pos->long_name_len;
@@ -813,12 +811,10 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine)
 	bool is_kallsyms = dso__is_kallsyms(dso);
 	bool is_vdso = dso__is_vdso(dso);
 	const char *name = dso->long_name;
-	char nm[PATH_MAX];
 
 	if (dso__is_kcore(dso)) {
 		is_kallsyms = true;
-		machine__mmap_name(machine, nm, sizeof(nm));
-		name = nm;
+		name = machine->mmap_name;
 	}
 	return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
 				     dso->nsinfo, is_kallsyms, is_vdso);
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 44e603c..4644e75 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -894,8 +894,6 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 				       struct machine *machine)
 {
 	size_t size;
-	const char *mmap_name;
-	char name_buff[PATH_MAX];
 	struct map *map = machine__kernel_map(machine);
 	struct kmap *kmap;
 	int err;
@@ -918,7 +916,6 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 		return -1;
 	}
 
-	mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 	if (machine__is_host(machine)) {
 		/*
 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
@@ -931,7 +928,7 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 
 	kmap = map__kmap(map);
 	size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
-			"%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
+			"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
 	size = PERF_ALIGN(size, sizeof(u64));
 	event->mmap.header.type = PERF_RECORD_MMAP;
 	event->mmap.header.size = (sizeof(event->mmap) -
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index c976384..b1f1961 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -48,6 +48,27 @@ static void machine__threads_init(struct machine *machine)
 	}
 }
 
+static int machine__set_mmap_name(struct machine *machine)
+{
+	if (machine__is_host(machine)) {
+		if (symbol_conf.vmlinux_name)
+			machine->mmap_name = strdup(symbol_conf.vmlinux_name);
+		else
+			machine->mmap_name = strdup("[kernel.kallsyms]");
+	} else if (machine__is_default_guest(machine)) {
+		if (symbol_conf.default_guest_vmlinux_name)
+			machine->mmap_name = strdup(symbol_conf.default_guest_vmlinux_name);
+		else
+			machine->mmap_name = strdup("[guest.kernel.kallsyms]");
+	} else {
+		if (asprintf(&machine->mmap_name, "[guest.kernel.kallsyms.%d]",
+			 machine->pid) < 0)
+			machine->mmap_name = NULL;
+	}
+
+	return machine->mmap_name ? 0 : -ENOMEM;
+}
+
 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
 {
 	int err = -ENOMEM;
@@ -75,6 +96,9 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
 	if (machine->root_dir == NULL)
 		return -ENOMEM;
 
+	if (machine__set_mmap_name(machine))
+		goto out;
+
 	if (pid != HOST_KERNEL_ID) {
 		struct thread *thread = machine__findnew_thread(machine, -1,
 								pid);
@@ -92,8 +116,10 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
 	err = 0;
 
 out:
-	if (err)
+	if (err) {
 		zfree(&machine->root_dir);
+		zfree(&machine->mmap_name);
+	}
 	return 0;
 }
 
@@ -186,6 +212,7 @@ void machine__exit(struct machine *machine)
 	dsos__exit(&machine->dsos);
 	machine__exit_vdso(machine);
 	zfree(&machine->root_dir);
+	zfree(&machine->mmap_name);
 	zfree(&machine->current_tid);
 
 	for (i = 0; i < THREADS__TABLE_SIZE; i++) {
@@ -328,20 +355,6 @@ void machines__process_guests(struct machines *machines,
 	}
 }
 
-char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
-{
-	if (machine__is_host(machine))
-		snprintf(bf, size, "[%s]", "kernel.kallsyms");
-	else if (machine__is_default_guest(machine))
-		snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
-	else {
-		snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
-			 machine->pid);
-	}
-
-	return bf;
-}
-
 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 {
 	struct rb_node *node;
@@ -777,25 +790,13 @@ size_t machine__fprintf(struct machine *machine, FILE *fp)
 
 static struct dso *machine__get_kernel(struct machine *machine)
 {
-	const char *vmlinux_name = NULL;
+	const char *vmlinux_name = machine->mmap_name;
 	struct dso *kernel;
 
 	if (machine__is_host(machine)) {
-		vmlinux_name = symbol_conf.vmlinux_name;
-		if (!vmlinux_name)
-			vmlinux_name = DSO__NAME_KALLSYMS;
-
 		kernel = machine__findnew_kernel(machine, vmlinux_name,
 						 "[kernel]", DSO_TYPE_KERNEL);
 	} else {
-		char bf[PATH_MAX];
-
-		if (machine__is_default_guest(machine))
-			vmlinux_name = symbol_conf.default_guest_vmlinux_name;
-		if (!vmlinux_name)
-			vmlinux_name = machine__mmap_name(machine, bf,
-							  sizeof(bf));
-
 		kernel = machine__findnew_kernel(machine, vmlinux_name,
 						 "[guest.kernel]",
 						 DSO_TYPE_GUEST_KERNEL);
@@ -1295,7 +1296,6 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
 					      union perf_event *event)
 {
 	struct map *map;
-	char kmmap_prefix[PATH_MAX];
 	enum dso_kernel_type kernel_type;
 	bool is_kernel_mmap;
 
@@ -1303,15 +1303,14 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
 	if (machine__uses_kcore(machine))
 		return 0;
 
-	machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 	if (machine__is_host(machine))
 		kernel_type = DSO_TYPE_KERNEL;
 	else
 		kernel_type = DSO_TYPE_GUEST_KERNEL;
 
 	is_kernel_mmap = memcmp(event->mmap.filename,
-				kmmap_prefix,
-				strlen(kmmap_prefix) - 1) == 0;
+				machine->mmap_name,
+				strlen(machine->mmap_name) - 1) == 0;
 	if (event->mmap.filename[0] == '/' ||
 	    (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 		map = machine__findnew_module_map(machine, event->mmap.start,
@@ -1322,7 +1321,7 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
 		map->end = map->start + event->mmap.len;
 	} else if (is_kernel_mmap) {
 		const char *symbol_name = (event->mmap.filename +
-				strlen(kmmap_prefix));
+				strlen(machine->mmap_name));
 		/*
 		 * Should be there already, from the build-id table in
 		 * the header.
@@ -1363,7 +1362,7 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
 		up_read(&machine->dsos.lock);
 
 		if (kernel == NULL)
-			kernel = machine__findnew_dso(machine, kmmap_prefix);
+			kernel = machine__findnew_dso(machine, machine->mmap_name);
 		if (kernel == NULL)
 			goto out_problem;
 
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 5ce860b..cb0a20f 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -43,6 +43,7 @@ struct machine {
 	bool		  comm_exec;
 	bool		  kptr_restrict_warned;
 	char		  *root_dir;
+	char		  *mmap_name;
 	struct threads    threads[THREADS__TABLE_SIZE];
 	struct vdso_info  *vdso_info;
 	struct perf_env   *env;
@@ -142,8 +143,6 @@ struct machine *machines__find(struct machines *machines, pid_t pid);
 struct machine *machines__findnew(struct machines *machines, pid_t pid);
 
 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size);
-char *machine__mmap_name(struct machine *machine, char *bf, size_t size);
-
 void machines__set_comm_exec(struct machines *machines, bool comm_exec);
 
 struct machine *machine__new_host(void);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index e366e30..a1a312d 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1958,8 +1958,7 @@ static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
 		pr_debug("Using %s for symbols\n", kallsyms_filename);
 	if (err > 0 && !dso__is_kcore(dso)) {
 		dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
-		machine__mmap_name(machine, path, sizeof(path));
-		dso__set_long_name(dso, strdup(path), true);
+		dso__set_long_name(dso, machine->mmap_name, false);
 		map__fixup_start(map);
 		map__fixup_end(map);
 	}