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Message-ID: <20090601205019.GA7805@ghostprotocols.net>
Date: Mon, 1 Jun 2009 17:50:19 -0300
From: Arnaldo Carvalho de Melo <acme@...hat.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: Mike Galbraith <efault@....de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Thomas Gleixner <tglx@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH tip 1/2] perf_counter tools: Use hex2u64 in more places
This has also a nice side effect, tools built on newer systems such as
fedora 10 again work on systems with older versions of glibc:
My workstation:
[acme@...pio ~]$ rpm -q glibc.x86_64
glibc-2.9-3.x86_64
Test machine:
[acme@...lia ~]$ rpm -q glibc.x86_64
glibc-2.5-24
Before:
[acme@...lia ~]$ perf
perf: /lib64/libc.so.6: version `GLIBC_2.7' not found (required by perf)
[acme@...lia ~]$ nm `which perf` | grep GLIBC_2\.7
U __isoc99_sscanf@@GLIBC_2.7
[acme@...lia ~]$
After:
[acme@...lia ~]$ perf
usage: perf [--version] [--help] COMMAND [ARGS]
The most commonly used perf commands are:
record Run a command and record its profile into perf.data
report Read perf.data (created by perf record) and display the
profile
stat Run a command and gather performance counter statistics
top Run a command and profile it
See 'perf help COMMAND' for more information on a specific command.
[acme@...lia ~]$ nm `which perf` | grep GLIBC_2\.7
[acme@...lia ~]$
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
Documentation/perf_counter/Makefile | 2 +
Documentation/perf_counter/builtin-record.c | 56 +++++++++++++----------
Documentation/perf_counter/builtin-report.c | 1 +
Documentation/perf_counter/util/parse-events.c | 27 +++++++-----
Documentation/perf_counter/util/symbol.c | 38 +---------------
5 files changed, 54 insertions(+), 70 deletions(-)
diff --git a/Documentation/perf_counter/Makefile b/Documentation/perf_counter/Makefile
index 416ab11..3b8275f 100644
--- a/Documentation/perf_counter/Makefile
+++ b/Documentation/perf_counter/Makefile
@@ -296,6 +296,7 @@ LIB_H += util/quote.h
LIB_H += util/util.h
LIB_H += util/help.h
LIB_H += util/strbuf.h
+LIB_H += util/string.h
LIB_H += util/run-command.h
LIB_H += util/sigchain.h
LIB_H += util/symbol.h
@@ -315,6 +316,7 @@ LIB_OBJS += util/rbtree.o
LIB_OBJS += util/run-command.o
LIB_OBJS += util/quote.o
LIB_OBJS += util/strbuf.o
+LIB_OBJS += util/string.o
LIB_OBJS += util/usage.o
LIB_OBJS += util/wrapper.o
LIB_OBJS += util/sigchain.o
diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index 23d1224..5aee047 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -5,6 +5,7 @@
#include "util/util.h"
#include "util/parse-options.h"
#include "util/parse-events.h"
+#include "util/string.h"
#include <sched.h>
@@ -165,12 +166,10 @@ static pid_t pid_synthesize_comm_event(pid_t pid)
{
struct comm_event comm_ev;
char filename[PATH_MAX];
- pid_t spid, ppid;
char bf[BUFSIZ];
- int fd, nr, ret;
- char comm[18];
+ int fd, ret;
size_t size;
- char state;
+ char *field, *sep;
snprintf(filename, sizeof(filename), "/proc/%d/stat", pid);
@@ -185,20 +184,22 @@ static pid_t pid_synthesize_comm_event(pid_t pid)
}
close(fd);
+ /* 9027 (cat) R 6747 9027 6747 34816 9027 ... */
memset(&comm_ev, 0, sizeof(comm_ev));
- nr = sscanf(bf, "%d %s %c %d %d ",
- &spid, comm, &state, &ppid, &comm_ev.pid);
- if (nr != 5) {
- fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
- filename);
- exit(EXIT_FAILURE);
- }
+ field = strchr(bf, '(');
+ if (field == NULL)
+ goto out_failure;
+ sep = strchr(++field, ')');
+ if (sep == NULL)
+ goto out_failure;
+ size = sep - field;
+ memcpy(comm_ev.comm, field, size++);
+ field = strchr(sep + 4, ' ');
+ if (field == NULL)
+ goto out_failure;
+ comm_ev.pid = atoi(++field);
comm_ev.header.type = PERF_EVENT_COMM;
comm_ev.tid = pid;
- size = strlen(comm);
- comm[--size] = '\0'; /* Remove the ')' at the end */
- --size; /* Remove the '(' at the begin */
- memcpy(comm_ev.comm, comm + 1, size);
size = ALIGN(size, sizeof(uint64_t));
comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
@@ -208,6 +209,11 @@ static pid_t pid_synthesize_comm_event(pid_t pid)
exit(-1);
}
return comm_ev.pid;
+out_failure:
+ fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
+ filename);
+ exit(EXIT_FAILURE);
+ return -1;
}
static void pid_synthesize_mmap_events(pid_t pid, pid_t pgid)
@@ -223,23 +229,25 @@ static void pid_synthesize_mmap_events(pid_t pid, pid_t pgid)
exit(EXIT_FAILURE);
}
while (1) {
- char bf[BUFSIZ];
- unsigned char vm_read, vm_write, vm_exec, vm_mayshare;
+ char bf[BUFSIZ], *pbf = bf;
struct mmap_event mmap_ev = {
.header.type = PERF_EVENT_MMAP,
};
- unsigned long ino;
- int major, minor;
+ int n;
size_t size;
if (fgets(bf, sizeof(bf), fp) == NULL)
break;
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
- sscanf(bf, "%llx-%llx %c%c%c%c %llx %x:%x %lu",
- &mmap_ev.start, &mmap_ev.len,
- &vm_read, &vm_write, &vm_exec, &vm_mayshare,
- &mmap_ev.pgoff, &major, &minor, &ino);
- if (vm_exec == 'x') {
+ n = hex2u64(pbf, &mmap_ev.start);
+ if (n < 0)
+ continue;
+ pbf += n + 1;
+ n = hex2u64(pbf, &mmap_ev.len);
+ if (n < 0)
+ continue;
+ pbf += n + 3;
+ if (*pbf == 'x') { /* vm_exec */
char *execname = strrchr(bf, ' ');
if (execname == NULL || execname[1] != '/')
diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
index 4705679..7973092 100644
--- a/Documentation/perf_counter/builtin-report.c
+++ b/Documentation/perf_counter/builtin-report.c
@@ -5,6 +5,7 @@
#include "util/cache.h"
#include "util/rbtree.h"
#include "util/symbol.h"
+#include "util/string.h"
#include "perf.h"
diff --git a/Documentation/perf_counter/util/parse-events.c b/Documentation/perf_counter/util/parse-events.c
index 88c903e..2fdfd1d 100644
--- a/Documentation/perf_counter/util/parse-events.c
+++ b/Documentation/perf_counter/util/parse-events.c
@@ -4,6 +4,7 @@
#include "parse-options.h"
#include "parse-events.h"
#include "exec_cmd.h"
+#include "string.h"
int nr_counters;
@@ -105,22 +106,26 @@ static __u64 match_event_symbols(const char *str)
__u64 config, id;
int type;
unsigned int i;
- char mask_str[4];
+ const char *sep, *pstr;
- if (sscanf(str, "r%llx", &config) == 1)
+ if (str[0] == 'r' && hex2u64(str + 1, &config) > 0)
return config | PERF_COUNTER_RAW_MASK;
- switch (sscanf(str, "%d:%llu:%2s", &type, &id, mask_str)) {
- case 3:
- if (strchr(mask_str, 'k'))
+ pstr = str;
+ sep = strchr(pstr, ':');
+ if (sep) {
+ type = atoi(pstr);
+ pstr = sep + 1;
+ id = atoi(pstr);
+ sep = strchr(pstr, ':');
+ if (sep) {
+ pstr = sep + 1;
+ if (strchr(pstr, 'k'))
event_mask[nr_counters] |= EVENT_MASK_USER;
- if (strchr(mask_str, 'u'))
+ if (strchr(pstr, 'u'))
event_mask[nr_counters] |= EVENT_MASK_KERNEL;
- case 2:
- return EID(type, id);
-
- default:
- break;
+ }
+ return EID(type, id);
}
for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
diff --git a/Documentation/perf_counter/util/symbol.c b/Documentation/perf_counter/util/symbol.c
index 4728121..31e8fae 100644
--- a/Documentation/perf_counter/util/symbol.c
+++ b/Documentation/perf_counter/util/symbol.c
@@ -1,5 +1,6 @@
#include "util.h"
#include "../perf.h"
+#include "string.h"
#include "symbol.h"
#include <libelf.h>
@@ -122,39 +123,6 @@ size_t dso__fprintf(struct dso *self, FILE *fp)
return ret;
}
-static int hex(char ch)
-{
- if ((ch >= '0') && (ch <= '9'))
- return ch - '0';
- if ((ch >= 'a') && (ch <= 'f'))
- return ch - 'a' + 10;
- if ((ch >= 'A') && (ch <= 'F'))
- return ch - 'A' + 10;
- return -1;
-}
-
-/*
- * While we find nice hex chars, build a long_val.
- * Return number of chars processed.
- */
-static int hex2long(char *ptr, unsigned long *long_val)
-{
- const char *p = ptr;
- *long_val = 0;
-
- while (*p) {
- const int hex_val = hex(*p);
-
- if (hex_val < 0)
- break;
-
- *long_val = (*long_val << 4) | hex_val;
- p++;
- }
-
- return p - ptr;
-}
-
static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter)
{
struct rb_node *nd, *prevnd;
@@ -166,7 +134,7 @@ static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter)
goto out_failure;
while (!feof(file)) {
- unsigned long start;
+ __u64 start;
struct symbol *sym;
int line_len, len;
char symbol_type;
@@ -180,7 +148,7 @@ static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter)
line[--line_len] = '\0'; /* \n */
- len = hex2long(line, &start);
+ len = hex2u64(line, &start);
len++;
if (len + 2 >= line_len)
--
1.6.0.6
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