Commit 86141027 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Merge tag 'perf-core-for-mingo-4.18-20180523' of... 

Merge tag 'perf-core-for-mingo-4.18-20180523' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux

 into perf/core

Pull perf/core improvements from Arnaldo Carvalho de Melo:

- Create extra kernel maps to help in decoding samples in x86 PTI entry
  trampolines (Adrian Hunter)

- Copy x86 PTI entry trampoline sections in the kcore copy used for
  annotation and intel_pt CPU traces decoding (Adrian Hunter)

- Support 'perf annotate --group' for non-explicit recorded event
  "groups", showing multiple columns, one for each event, just like
  when dealing with explicit event groups (those enclosed with {}) (Jin Yao)

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parents 2996123e 22916fdb

tools/perf/arch/x86/util/Build

+2 −0
Original line number Diff line number Diff line
@@ -4,6 +4,8 @@ libperf-y += pmu.o 
libperf-y += kvm-stat.o

libperf-y += perf_regs.o

libperf-y += group.o

libperf-y += machine.o

libperf-y += event.o



libperf-$(CONFIG_DWARF) += dwarf-regs.o

libperf-$(CONFIG_BPF_PROLOGUE) += dwarf-regs.o

tools/perf/arch/x86/util/event.c

0 → 100644
+76 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <linux/types.h>

#include <linux/string.h>



#include "../../util/machine.h"

#include "../../util/tool.h"

#include "../../util/map.h"

#include "../../util/util.h"

#include "../../util/debug.h"



#if defined(__x86_64__)



int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,

				       perf_event__handler_t process,

				       struct machine *machine)

{

	int rc = 0;

	struct map *pos;

	struct map_groups *kmaps = &machine->kmaps;

	struct maps *maps = &kmaps->maps;

	union perf_event *event = zalloc(sizeof(event->mmap) +

					 machine->id_hdr_size);



	if (!event) {

		pr_debug("Not enough memory synthesizing mmap event "

			 "for extra kernel maps\n");

		return -1;

	}



	for (pos = maps__first(maps); pos; pos = map__next(pos)) {

		struct kmap *kmap;

		size_t size;



		if (!__map__is_extra_kernel_map(pos))

			continue;



		kmap = map__kmap(pos);



		size = sizeof(event->mmap) - sizeof(event->mmap.filename) +

		       PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +

		       machine->id_hdr_size;



		memset(event, 0, size);



		event->mmap.header.type = PERF_RECORD_MMAP;



		/*

		 * kernel uses 0 for user space maps, see kernel/perf_event.c

		 * __perf_event_mmap

		 */

		if (machine__is_host(machine))

			event->header.misc = PERF_RECORD_MISC_KERNEL;

		else

			event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;



		event->mmap.header.size = size;



		event->mmap.start = pos->start;

		event->mmap.len   = pos->end - pos->start;

		event->mmap.pgoff = pos->pgoff;

		event->mmap.pid   = machine->pid;



		strlcpy(event->mmap.filename, kmap->name, PATH_MAX);



		if (perf_tool__process_synth_event(tool, event, machine,

						   process) != 0) {

			rc = -1;

			break;

		}

	}



	free(event);

	return rc;

}



#endif

tools/perf/arch/x86/util/machine.c

0 → 100644
+103 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <linux/types.h>

#include <linux/string.h>

#include <stdlib.h>



#include "../../util/machine.h"

#include "../../util/map.h"

#include "../../util/symbol.h"

#include "../../util/sane_ctype.h"



#include <symbol/kallsyms.h>



#if defined(__x86_64__)



struct extra_kernel_map_info {

	int cnt;

	int max_cnt;

	struct extra_kernel_map *maps;

	bool get_entry_trampolines;

	u64 entry_trampoline;

};



static int add_extra_kernel_map(struct extra_kernel_map_info *mi, u64 start,

				u64 end, u64 pgoff, const char *name)

{

	if (mi->cnt >= mi->max_cnt) {

		void *buf;

		size_t sz;



		mi->max_cnt = mi->max_cnt ? mi->max_cnt * 2 : 32;

		sz = sizeof(struct extra_kernel_map) * mi->max_cnt;

		buf = realloc(mi->maps, sz);

		if (!buf)

			return -1;

		mi->maps = buf;

	}



	mi->maps[mi->cnt].start = start;

	mi->maps[mi->cnt].end   = end;

	mi->maps[mi->cnt].pgoff = pgoff;

	strlcpy(mi->maps[mi->cnt].name, name, KMAP_NAME_LEN);



	mi->cnt += 1;



	return 0;

}



static int find_extra_kernel_maps(void *arg, const char *name, char type,

				  u64 start)

{

	struct extra_kernel_map_info *mi = arg;



	if (!mi->entry_trampoline && kallsyms2elf_binding(type) == STB_GLOBAL &&

	    !strcmp(name, "_entry_trampoline")) {

		mi->entry_trampoline = start;

		return 0;

	}



	if (is_entry_trampoline(name)) {

		u64 end = start + page_size;



		return add_extra_kernel_map(mi, start, end, 0, name);

	}



	return 0;

}



int machine__create_extra_kernel_maps(struct machine *machine,

				      struct dso *kernel)

{

	struct extra_kernel_map_info mi = { .cnt = 0, };

	char filename[PATH_MAX];

	int ret;

	int i;



	machine__get_kallsyms_filename(machine, filename, PATH_MAX);



	if (symbol__restricted_filename(filename, "/proc/kallsyms"))

		return 0;



	ret = kallsyms__parse(filename, &mi, find_extra_kernel_maps);

	if (ret)

		goto out_free;



	if (!mi.entry_trampoline)

		goto out_free;



	for (i = 0; i < mi.cnt; i++) {

		struct extra_kernel_map *xm = &mi.maps[i];



		xm->pgoff = mi.entry_trampoline;

		ret = machine__create_extra_kernel_map(machine, kernel, xm);

		if (ret)

			goto out_free;

	}



	machine->trampolines_mapped = mi.cnt;

out_free:

	free(mi.maps);

	return ret;

}



#endif

tools/perf/builtin-annotate.c

+7 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ struct perf_annotate { 
	bool	   print_line;

	bool	   skip_missing;

	bool	   has_br_stack;

	bool	   group_set;

	const char *sym_hist_filter;

	const char *cpu_list;

	DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
@@ -508,6 +509,9 @@ int cmd_annotate(int argc, const char **argv) 
		    "Don't shorten the displayed pathnames"),

	OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,

		    "Skip symbols that cannot be annotated"),

	OPT_BOOLEAN_SET(0, "group", &symbol_conf.event_group,

			&annotate.group_set,

			"Show event group information together"),

	OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),

	OPT_CALLBACK(0, "symfs", NULL, "directory",

		     "Look for files with symbols relative to this directory",
@@ -570,6 +574,9 @@ int cmd_annotate(int argc, const char **argv) 
	annotate.has_br_stack = perf_header__has_feat(&annotate.session->header,

						      HEADER_BRANCH_STACK);



	if (annotate.group_set)

		perf_evlist__force_leader(annotate.session->evlist);



	ret = symbol__annotation_init();

	if (ret < 0)

		goto out_delete;

tools/perf/builtin-report.c

+2 −11
Original line number Diff line number Diff line
@@ -194,20 +194,11 @@ out: 
	return err;

}



/*

 * Events in data file are not collect in groups, but we still want

 * the group display. Set the artificial group and set the leader's

 * forced_leader flag to notify the display code.

 */

static void setup_forced_leader(struct report *report,

				struct perf_evlist *evlist)

{

	if (report->group_set && !evlist->nr_groups) {

		struct perf_evsel *leader = perf_evlist__first(evlist);



		perf_evlist__set_leader(evlist);

		leader->forced_leader = true;

	}

	if (report->group_set)

		perf_evlist__force_leader(evlist);

}



static int process_feature_event(struct perf_tool *tool,

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