linux/tools/perf/builtin-mem.c
Yunlong Song 62a1a63a77 perf mem: Support using -f to override perf.data file ownership
Enable perf mem to use perf.data when it is not owned by current user or
root.

Example:

 # perf mem -t load record ls
 # chown Yunlong.Song:Yunlong.Song perf.data
 # ls -al perf.data
 -rw------- 1 Yunlong.Song Yunlong.Song 16392 Apr  2 14:34 perf.data
 # id
 uid=0(root) gid=0(root) groups=0(root),64(pkcs11)

Before this patch:

 # perf mem -D report
 File perf.data not owned by current user or root (use -f to override)
 # perf mem -D -f report
   Error: unknown switch `f'

  usage: perf mem [<options>] {record|report}

     -t, --type <type>     memory operations(load,store) Default load,store
     -D, --dump-raw-samples
                           dump raw samples in ASCII
     -U, --hide-unresolved
                           Only display entries resolved to a symbol
     -i, --input <file>    input file name
     -C, --cpu <cpu>       list of cpus to profile
     -x, --field-separator <separator>
                           separator for columns, no spaces will be added
                           between columns '.' is reserved.

As shown above, the -f option does not work at all.

After this patch:

 # perf mem -D report
 File perf.data not owned by current user or root (use -f to override)
 # perf mem -D -f report
 # PID, TID, IP, ADDR, LOCAL WEIGHT, DSRC, SYMBOL
 39095 39095 0xffffffff81127e40 0x016ffff887f45148338 8 0x68100142
 /proc/kcore:perf_event_aux
 39095 39095 0xffffffff8100a3fe 0xffff89007f8cb7d0 6 0x68100142
 /proc/kcore:native_sched_clock
 39095 39095 0xffffffff81309139 0xffff88bf44c9ded8 6 0x68100142
 /proc/kcore:acpi_map_lookup
 39095 39095 0xffffffff810f8c4c 0xffff89007f8ccd88 6 0x68100142
 /proc/kcore:rcu_nmi_exit
 39095 39095 0xffffffff81136346 0xffff88fea995dd50 6 0x68100142
 /proc/kcore:unlock_page
 39095 39095 0xffffffff812a64a2 0xffff88fea995dcc8 6 0x68100142
 /proc/kcore:half_md4_transform
 39095 39095 0x7f0cf877c7e9 0x25dfb94 6 0x68100142
 /lib64/libc-2.19.so:__readdir64
 39095 39095 0x7f0cf87575a3 0x7f0cf9163731 6 0x68100142
 /lib64/libc-2.19.so:__strcoll_l
 39095 39095 0xffffffff8116910e 0xffffea01c1bfbd50 23 0x68100242
 /proc/kcore:page_remove_rmap

As shown above, the -f option really works now.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1427982439-27388-7-git-send-email-yunlong.song@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-04-02 13:18:49 -03:00

327 lines
7.2 KiB
C

#include "builtin.h"
#include "perf.h"
#include "util/parse-options.h"
#include "util/trace-event.h"
#include "util/tool.h"
#include "util/session.h"
#include "util/data.h"
#define MEM_OPERATION_LOAD 0x1
#define MEM_OPERATION_STORE 0x2
struct perf_mem {
struct perf_tool tool;
char const *input_name;
bool hide_unresolved;
bool dump_raw;
bool force;
int operation;
const char *cpu_list;
DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
};
static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
{
int rec_argc, i = 0, j;
const char **rec_argv;
int ret;
rec_argc = argc + 7; /* max number of arguments */
rec_argv = calloc(rec_argc + 1, sizeof(char *));
if (!rec_argv)
return -1;
rec_argv[i++] = "record";
if (mem->operation & MEM_OPERATION_LOAD)
rec_argv[i++] = "-W";
rec_argv[i++] = "-d";
if (mem->operation & MEM_OPERATION_LOAD) {
rec_argv[i++] = "-e";
rec_argv[i++] = "cpu/mem-loads/pp";
}
if (mem->operation & MEM_OPERATION_STORE) {
rec_argv[i++] = "-e";
rec_argv[i++] = "cpu/mem-stores/pp";
}
for (j = 1; j < argc; j++, i++)
rec_argv[i] = argv[j];
ret = cmd_record(i, rec_argv, NULL);
free(rec_argv);
return ret;
}
static int
dump_raw_samples(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_mem *mem = container_of(tool, struct perf_mem, tool);
struct addr_location al;
const char *fmt;
if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
fprintf(stderr, "problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
if (al.filtered || (mem->hide_unresolved && al.sym == NULL))
return 0;
if (al.map != NULL)
al.map->dso->hit = 1;
if (symbol_conf.field_sep) {
fmt = "%d%s%d%s0x%"PRIx64"%s0x%"PRIx64"%s%"PRIu64
"%s0x%"PRIx64"%s%s:%s\n";
} else {
fmt = "%5d%s%5d%s0x%016"PRIx64"%s0x016%"PRIx64
"%s%5"PRIu64"%s0x%06"PRIx64"%s%s:%s\n";
symbol_conf.field_sep = " ";
}
printf(fmt,
sample->pid,
symbol_conf.field_sep,
sample->tid,
symbol_conf.field_sep,
sample->ip,
symbol_conf.field_sep,
sample->addr,
symbol_conf.field_sep,
sample->weight,
symbol_conf.field_sep,
sample->data_src,
symbol_conf.field_sep,
al.map ? (al.map->dso ? al.map->dso->long_name : "???") : "???",
al.sym ? al.sym->name : "???");
return 0;
}
static int process_sample_event(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel __maybe_unused,
struct machine *machine)
{
return dump_raw_samples(tool, event, sample, machine);
}
static int report_raw_events(struct perf_mem *mem)
{
struct perf_data_file file = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
.force = mem->force,
};
int err = -EINVAL;
int ret;
struct perf_session *session = perf_session__new(&file, false,
&mem->tool);
if (session == NULL)
return -1;
if (mem->cpu_list) {
ret = perf_session__cpu_bitmap(session, mem->cpu_list,
mem->cpu_bitmap);
if (ret)
goto out_delete;
}
if (symbol__init(&session->header.env) < 0)
return -1;
printf("# PID, TID, IP, ADDR, LOCAL WEIGHT, DSRC, SYMBOL\n");
err = perf_session__process_events(session);
if (err)
return err;
return 0;
out_delete:
perf_session__delete(session);
return err;
}
static int report_events(int argc, const char **argv, struct perf_mem *mem)
{
const char **rep_argv;
int ret, i = 0, j, rep_argc;
if (mem->dump_raw)
return report_raw_events(mem);
rep_argc = argc + 3;
rep_argv = calloc(rep_argc + 1, sizeof(char *));
if (!rep_argv)
return -1;
rep_argv[i++] = "report";
rep_argv[i++] = "--mem-mode";
rep_argv[i++] = "-n"; /* display number of samples */
/*
* there is no weight (cost) associated with stores, so don't print
* the column
*/
if (!(mem->operation & MEM_OPERATION_LOAD))
rep_argv[i++] = "--sort=mem,sym,dso,symbol_daddr,"
"dso_daddr,tlb,locked";
for (j = 1; j < argc; j++, i++)
rep_argv[i] = argv[j];
ret = cmd_report(i, rep_argv, NULL);
free(rep_argv);
return ret;
}
struct mem_mode {
const char *name;
int mode;
};
#define MEM_OPT(n, m) \
{ .name = n, .mode = (m) }
#define MEM_END { .name = NULL }
static const struct mem_mode mem_modes[]={
MEM_OPT("load", MEM_OPERATION_LOAD),
MEM_OPT("store", MEM_OPERATION_STORE),
MEM_END
};
static int
parse_mem_ops(const struct option *opt, const char *str, int unset)
{
int *mode = (int *)opt->value;
const struct mem_mode *m;
char *s, *os = NULL, *p;
int ret = -1;
if (unset)
return 0;
/* str may be NULL in case no arg is passed to -t */
if (str) {
/* because str is read-only */
s = os = strdup(str);
if (!s)
return -1;
/* reset mode */
*mode = 0;
for (;;) {
p = strchr(s, ',');
if (p)
*p = '\0';
for (m = mem_modes; m->name; m++) {
if (!strcasecmp(s, m->name))
break;
}
if (!m->name) {
fprintf(stderr, "unknown sampling op %s,"
" check man page\n", s);
goto error;
}
*mode |= m->mode;
if (!p)
break;
s = p + 1;
}
}
ret = 0;
if (*mode == 0)
*mode = MEM_OPERATION_LOAD;
error:
free(os);
return ret;
}
int cmd_mem(int argc, const char **argv, const char *prefix __maybe_unused)
{
struct stat st;
struct perf_mem mem = {
.tool = {
.sample = process_sample_event,
.mmap = perf_event__process_mmap,
.mmap2 = perf_event__process_mmap2,
.comm = perf_event__process_comm,
.lost = perf_event__process_lost,
.fork = perf_event__process_fork,
.build_id = perf_event__process_build_id,
.ordered_events = true,
},
.input_name = "perf.data",
/*
* default to both load an store sampling
*/
.operation = MEM_OPERATION_LOAD | MEM_OPERATION_STORE,
};
const struct option mem_options[] = {
OPT_CALLBACK('t', "type", &mem.operation,
"type", "memory operations(load,store) Default load,store",
parse_mem_ops),
OPT_BOOLEAN('D', "dump-raw-samples", &mem.dump_raw,
"dump raw samples in ASCII"),
OPT_BOOLEAN('U', "hide-unresolved", &mem.hide_unresolved,
"Only display entries resolved to a symbol"),
OPT_STRING('i', "input", &input_name, "file",
"input file name"),
OPT_STRING('C', "cpu", &mem.cpu_list, "cpu",
"list of cpus to profile"),
OPT_STRING_NOEMPTY('x', "field-separator", &symbol_conf.field_sep,
"separator",
"separator for columns, no spaces will be added"
" between columns '.' is reserved."),
OPT_BOOLEAN('f', "force", &mem.force, "don't complain, do it"),
OPT_END()
};
const char *const mem_subcommands[] = { "record", "report", NULL };
const char *mem_usage[] = {
NULL,
NULL
};
argc = parse_options_subcommand(argc, argv, mem_options, mem_subcommands,
mem_usage, PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc || !(strncmp(argv[0], "rec", 3) || mem.operation))
usage_with_options(mem_usage, mem_options);
if (!mem.input_name || !strlen(mem.input_name)) {
if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
mem.input_name = "-";
else
mem.input_name = "perf.data";
}
if (!strncmp(argv[0], "rec", 3))
return __cmd_record(argc, argv, &mem);
else if (!strncmp(argv[0], "rep", 3))
return report_events(argc, argv, &mem);
else
usage_with_options(mem_usage, mem_options);
return 0;
}