Add --line option to support showing probable source-code lines.
perf probe --line SRC:LN[-LN|+NUM]
or
perf probe --line FUNC[:LN[-LN|+NUM]]
This option shows source-code with line number if the line can
be probed. Lines without line number (and blue color) means that
the line can not be probed, because debuginfo doesn't have the
information of those lines.
The argument specifies the range of lines, "source.c:100-120"
shows lines between 100th to l20th in source.c file. And
"func:10+20" shows 20 lines from 10th line of func function.
e.g.
# ./perf probe --line kernel/sched.c:1080
<kernel/sched.c:1080>
*
* called with rq->lock held and irqs disabled
*/
static void hrtick_start(struct rq *rq, u64 delay)
{
struct hrtimer *timer = &rq->hrtick_timer;
1086 ktime_t time = ktime_add_ns(timer->base->get_time(), delay);
hrtimer_set_expires(timer, time);
1090 if (rq == this_rq()) {
1091 hrtimer_restart(timer);
1092 } else if (!rq->hrtick_csd_pending) {
1093 __smp_call_function_single(cpu_of(rq), &rq->hrtick_csd,
1094 rq->hrtick_csd_pending = 1;
If you specifying function name, this shows function-relative
line number.
# ./perf probe --line schedule
<schedule:0>
asmlinkage void __sched schedule(void)
1 {
struct task_struct *prev, *next;
unsigned long *switch_count;
struct rq *rq;
int cpu;
need_resched:
preempt_disable();
9 cpu = smp_processor_id();
10 rq = cpu_rq(cpu);
11 rcu_sched_qs(cpu);
12 prev = rq->curr;
13 switch_count = &prev->nivcsw;
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <
20100106144534.27218.77939.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
'perf probe' [options] --del='[GROUP:]EVENT' [...]
or
'perf probe' --list
+or
+'perf probe' --line='FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]'
DESCRIPTION
-----------
--list::
List up current probe events.
+-L::
+--line=::
+ Show source code lines which can be probed. This needs an argument
+ which specifies a range of the source code.
+
PROBE SYNTAX
------------
Probe points are defined by following syntax.
It is also possible to specify a probe point by the source line number by using 'SRC:ALN' syntax, where 'SRC' is the source file path and 'ALN' is the line number.
'ARG' specifies the arguments of this probe point. You can use the name of local variable, or kprobe-tracer argument format (e.g. $retval, %ax, etc).
+LINE SYNTAX
+-----------
+Line range is descripted by following syntax.
+
+ "FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]"
+
+FUNC specifies the function name of showing lines. 'RLN' is the start line
+number from function entry line, and 'RLN2' is the end line number. As same as
+probe syntax, 'SRC' means the source file path, 'ALN' is start line number,
+and 'ALN2' is end line number in the file. It is also possible to specify how
+many lines to show by using 'NUM'.
+So, "source.c:100-120" shows lines between 100th to l20th in source.c file. And "func:10+20" shows 20 lines from 10th line of func function.
+
SEE ALSO
--------
linkperf:perf-trace[1], linkperf:perf-record[1]
bool need_dwarf;
bool list_events;
bool force_add;
+ bool show_lines;
int nr_probe;
struct probe_point probes[MAX_PROBES];
struct strlist *dellist;
struct perf_session *psession;
struct map *kmap;
+ struct line_range line_range;
} session;
return 0;
}
+static int opt_show_lines(const struct option *opt __used,
+ const char *str, int unset __used)
+{
+ if (str)
+ parse_line_range_desc(str, &session.line_range);
+ INIT_LIST_HEAD(&session.line_range.line_list);
+ session.show_lines = true;
+ return 0;
+}
/* Currently just checking function name from symbol map */
static void evaluate_probe_point(struct probe_point *pp)
{
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
"perf probe --list",
+ "perf probe --line 'LINEDESC'",
NULL
};
opt_add_probe_event),
OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
" with existing name"),
+#ifndef NO_LIBDWARF
+ OPT_CALLBACK('L', "line", NULL,
+ "FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]",
+ "Show source code lines.", opt_show_lines),
+#endif
OPT_END()
};
+/* Initialize symbol maps for vmlinux */
+static void init_vmlinux(void)
+{
+ symbol_conf.sort_by_name = true;
+ if (symbol_conf.vmlinux_name == NULL)
+ symbol_conf.try_vmlinux_path = true;
+ else
+ pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
+ if (symbol__init() < 0)
+ die("Failed to init symbol map.");
+ session.psession = perf_session__new(NULL, O_WRONLY, false);
+ if (session.psession == NULL)
+ die("Failed to init perf_session.");
+ session.kmap = session.psession->vmlinux_maps[MAP__FUNCTION];
+ if (!session.kmap)
+ die("Could not find kernel map.\n");
+}
+
int cmd_probe(int argc, const char **argv, const char *prefix __used)
{
int i, ret;
parse_probe_event_argv(argc, argv);
}
- if ((!session.nr_probe && !session.dellist && !session.list_events))
+ if ((!session.nr_probe && !session.dellist && !session.list_events &&
+ !session.show_lines))
usage_with_options(probe_usage, options);
if (debugfs_valid_mountpoint(debugfs_path) < 0)
" --add/--del.\n");
usage_with_options(probe_usage, options);
}
+ if (session.show_lines) {
+ pr_warning(" Error: Don't use --list with --line.\n");
+ usage_with_options(probe_usage, options);
+ }
show_perf_probe_events();
return 0;
}
+#ifndef NO_LIBDWARF
+ if (session.show_lines) {
+ if (session.nr_probe != 0 || session.dellist) {
+ pr_warning(" Error: Don't use --line with"
+ " --add/--del.\n");
+ usage_with_options(probe_usage, options);
+ }
+ init_vmlinux();
+ fd = open_vmlinux();
+ if (fd < 0)
+ die("Could not open debuginfo file.");
+ ret = find_line_range(fd, &session.line_range);
+ if (ret <= 0)
+ die("Source line is not found.\n");
+ close(fd);
+ show_line_range(&session.line_range);
+ return 0;
+ }
+#endif
+
if (session.dellist) {
del_trace_kprobe_events(session.dellist);
strlist__delete(session.dellist);
return 0;
}
- /* Initialize symbol maps for vmlinux */
- symbol_conf.sort_by_name = true;
- if (symbol_conf.vmlinux_name == NULL)
- symbol_conf.try_vmlinux_path = true;
- if (symbol__init() < 0)
- die("Failed to init symbol map.");
- session.psession = perf_session__new(NULL, O_WRONLY, false);
- if (session.psession == NULL)
- die("Failed to init perf_session.");
- session.kmap = session.psession->vmlinux_maps[MAP__FUNCTION];
- if (!session.kmap)
- die("Could not find kernel map.\n");
+ /* Add probes */
+ init_vmlinux();
if (session.need_dwarf)
#ifdef NO_LIBDWARF
#include "strlist.h"
#include "debug.h"
#include "cache.h"
+#include "color.h"
#include "parse-events.h" /* For debugfs_path */
#include "probe-event.h"
return ret;
}
+void parse_line_range_desc(const char *arg, struct line_range *lr)
+{
+ const char *ptr;
+ char *tmp;
+ /*
+ * <Syntax>
+ * SRC:SLN[+NUM|-ELN]
+ * FUNC[:SLN[+NUM|-ELN]]
+ */
+ ptr = strchr(arg, ':');
+ if (ptr) {
+ lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0);
+ if (*tmp == '+')
+ lr->end = lr->start + (unsigned int)strtoul(tmp + 1,
+ &tmp, 0);
+ else if (*tmp == '-')
+ lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0);
+ else
+ lr->end = 0;
+ pr_debug("Line range is %u to %u\n", lr->start, lr->end);
+ if (lr->end && lr->start > lr->end)
+ semantic_error("Start line must be smaller"
+ " than end line.");
+ if (*tmp != '\0')
+ semantic_error("Tailing with invalid character '%d'.",
+ *tmp);
+ tmp = strndup(arg, (ptr - arg));
+ } else
+ tmp = strdup(arg);
+
+ if (strchr(tmp, '.'))
+ lr->file = tmp;
+ else
+ lr->function = tmp;
+}
+
/* Check the name is good for event/group */
static bool check_event_name(const char *name)
{
close(fd);
}
+#define LINEBUF_SIZE 256
+
+static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num)
+{
+ char buf[LINEBUF_SIZE];
+ const char *color = PERF_COLOR_BLUE;
+
+ if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
+ goto error;
+ if (!skip) {
+ if (show_num)
+ fprintf(stdout, "%7u %s", l, buf);
+ else
+ color_fprintf(stdout, color, " %s", buf);
+ }
+
+ while (strlen(buf) == LINEBUF_SIZE - 1 &&
+ buf[LINEBUF_SIZE - 2] != '\n') {
+ if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
+ goto error;
+ if (!skip) {
+ if (show_num)
+ fprintf(stdout, "%s", buf);
+ else
+ color_fprintf(stdout, color, "%s", buf);
+ }
+ }
+ return;
+error:
+ if (feof(fp))
+ die("Source file is shorter than expected.");
+ else
+ die("File read error: %s", strerror(errno));
+}
+
+void show_line_range(struct line_range *lr)
+{
+ unsigned int l = 1;
+ struct line_node *ln;
+ FILE *fp;
+
+ setup_pager();
+
+ if (lr->function)
+ fprintf(stdout, "<%s:%d>\n", lr->function,
+ lr->start - lr->offset);
+ else
+ fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
+
+ fp = fopen(lr->path, "r");
+ if (fp == NULL)
+ die("Failed to open %s: %s", lr->path, strerror(errno));
+ /* Skip to starting line number */
+ while (l < lr->start)
+ show_one_line(fp, l++, true, false);
+
+ list_for_each_entry(ln, &lr->line_list, list) {
+ while (ln->line > l)
+ show_one_line(fp, (l++) - lr->offset, false, false);
+ show_one_line(fp, (l++) - lr->offset, false, true);
+ }
+ fclose(fp);
+}
#include "probe-finder.h"
#include "strlist.h"
+extern void parse_line_range_desc(const char *arg, struct line_range *lr);
extern void parse_perf_probe_event(const char *str, struct probe_point *pp,
bool *need_dwarf);
extern int synthesize_perf_probe_point(struct probe_point *pp);
bool force_add);
extern void del_trace_kprobe_events(struct strlist *dellist);
extern void show_perf_probe_events(void);
+extern void show_line_range(struct line_range *lr);
/* Maximum index number of event-name postfix */
#define MAX_EVENT_INDEX 1024
return found;
}
+static int cu_get_filename(Dwarf_Die cu_die, Dwarf_Unsigned fno, char **buf)
+{
+ Dwarf_Signed cnt, i;
+ char **srcs;
+ int ret = 0;
+
+ if (!buf || !fno)
+ return -EINVAL;
+
+ ret = dwarf_srcfiles(cu_die, &srcs, &cnt, &__dw_error);
+ if (ret == DW_DLV_OK) {
+ if ((Dwarf_Unsigned)cnt > fno - 1) {
+ *buf = strdup(srcs[fno - 1]);
+ ret = 0;
+ pr_debug("found filename: %s\n", *buf);
+ } else
+ ret = -ENOENT;
+ for (i = 0; i < cnt; i++)
+ dwarf_dealloc(__dw_debug, srcs[i], DW_DLA_STRING);
+ dwarf_dealloc(__dw_debug, srcs, DW_DLA_LIST);
+ } else
+ ret = -EINVAL;
+ return ret;
+}
+
/* Compare diename and tname */
static int die_compare_name(Dwarf_Die dw_die, const char *tname)
{
}
/* Find probe point from its line number */
-static void find_by_line(struct probe_finder *pf)
+static void find_probe_point_by_line(struct probe_finder *pf)
{
Dwarf_Signed cnt, i, clm;
Dwarf_Line *lines;
pf->fno = die_get_decl_file(dlink->die);
pf->lno = die_get_decl_line(dlink->die)
+ pp->line;
- find_by_line(pf);
+ find_probe_point_by_line(pf);
return 1;
}
if (die_inlined_subprogram(dlink->die)) {
return 0;
}
-static void find_by_func(struct probe_finder *pf)
+static void find_probe_point_by_func(struct probe_finder *pf)
{
search_die_from_children(pf->cu_die, probefunc_callback, pf);
}
if (ret == DW_DLV_NO_ENTRY)
pf.cu_base = 0;
if (pp->function)
- find_by_func(&pf);
+ find_probe_point_by_func(&pf);
else {
pf.lno = pp->line;
- find_by_line(&pf);
+ find_probe_point_by_line(&pf);
}
}
dwarf_dealloc(__dw_debug, pf.cu_die, DW_DLA_DIE);
return pp->found;
}
+
+static void line_range_add_line(struct line_range *lr, unsigned int line)
+{
+ struct line_node *ln;
+ struct list_head *p;
+
+ /* Reverse search, because new line will be the last one */
+ list_for_each_entry_reverse(ln, &lr->line_list, list) {
+ if (ln->line < line) {
+ p = &ln->list;
+ goto found;
+ } else if (ln->line == line) /* Already exist */
+ return ;
+ }
+ /* List is empty, or the smallest entry */
+ p = &lr->line_list;
+found:
+ pr_debug("Debug: add a line %u\n", line);
+ ln = zalloc(sizeof(struct line_node));
+ DIE_IF(ln == NULL);
+ ln->line = line;
+ INIT_LIST_HEAD(&ln->list);
+ list_add(&ln->list, p);
+}
+
+/* Find line range from its line number */
+static void find_line_range_by_line(struct line_finder *lf)
+{
+ Dwarf_Signed cnt, i;
+ Dwarf_Line *lines;
+ Dwarf_Unsigned lineno = 0;
+ Dwarf_Unsigned fno;
+ Dwarf_Addr addr;
+ int ret;
+
+ ret = dwarf_srclines(lf->cu_die, &lines, &cnt, &__dw_error);
+ DIE_IF(ret != DW_DLV_OK);
+
+ for (i = 0; i < cnt; i++) {
+ ret = dwarf_line_srcfileno(lines[i], &fno, &__dw_error);
+ DIE_IF(ret != DW_DLV_OK);
+ if (fno != lf->fno)
+ continue;
+
+ ret = dwarf_lineno(lines[i], &lineno, &__dw_error);
+ DIE_IF(ret != DW_DLV_OK);
+ if (lf->lno_s > lineno || lf->lno_e < lineno)
+ continue;
+
+ /* Filter line in the function address range */
+ if (lf->addr_s && lf->addr_e) {
+ ret = dwarf_lineaddr(lines[i], &addr, &__dw_error);
+ DIE_IF(ret != DW_DLV_OK);
+ if (lf->addr_s > addr || lf->addr_e <= addr)
+ continue;
+ }
+ line_range_add_line(lf->lr, (unsigned int)lineno);
+ }
+ dwarf_srclines_dealloc(__dw_debug, lines, cnt);
+ if (!list_empty(&lf->lr->line_list))
+ lf->found = 1;
+}
+
+/* Search function from function name */
+static int linefunc_callback(struct die_link *dlink, void *data)
+{
+ struct line_finder *lf = (struct line_finder *)data;
+ struct line_range *lr = lf->lr;
+ Dwarf_Half tag;
+ int ret;
+
+ ret = dwarf_tag(dlink->die, &tag, &__dw_error);
+ DIE_IF(ret == DW_DLV_ERROR);
+ if (tag == DW_TAG_subprogram &&
+ die_compare_name(dlink->die, lr->function) == 0) {
+ /* Get the address range of this function */
+ ret = dwarf_highpc(dlink->die, &lf->addr_e, &__dw_error);
+ if (ret == DW_DLV_OK)
+ ret = dwarf_lowpc(dlink->die, &lf->addr_s, &__dw_error);
+ DIE_IF(ret == DW_DLV_ERROR);
+ if (ret == DW_DLV_NO_ENTRY) {
+ lf->addr_s = 0;
+ lf->addr_e = 0;
+ }
+
+ lf->fno = die_get_decl_file(dlink->die);
+ lr->offset = die_get_decl_line(dlink->die);;
+ lf->lno_s = lr->offset + lr->start;
+ if (!lr->end)
+ lf->lno_e = (Dwarf_Unsigned)-1;
+ else
+ lf->lno_e = lr->offset + lr->end;
+ lr->start = lf->lno_s;
+ lr->end = lf->lno_e;
+ find_line_range_by_line(lf);
+ /* If we find a target function, this should be end. */
+ lf->found = 1;
+ return 1;
+ }
+ return 0;
+}
+
+static void find_line_range_by_func(struct line_finder *lf)
+{
+ search_die_from_children(lf->cu_die, linefunc_callback, lf);
+}
+
+int find_line_range(int fd, struct line_range *lr)
+{
+ Dwarf_Half addr_size = 0;
+ Dwarf_Unsigned next_cuh = 0;
+ int ret;
+ struct line_finder lf = {.lr = lr};
+
+ ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
+ if (ret != DW_DLV_OK)
+ return -ENOENT;
+
+ while (!lf.found) {
+ /* Search CU (Compilation Unit) */
+ ret = dwarf_next_cu_header(__dw_debug, NULL, NULL, NULL,
+ &addr_size, &next_cuh, &__dw_error);
+ DIE_IF(ret == DW_DLV_ERROR);
+ if (ret == DW_DLV_NO_ENTRY)
+ break;
+
+ /* Get the DIE(Debugging Information Entry) of this CU */
+ ret = dwarf_siblingof(__dw_debug, 0, &lf.cu_die, &__dw_error);
+ DIE_IF(ret != DW_DLV_OK);
+
+ /* Check if target file is included. */
+ if (lr->file)
+ lf.fno = cu_find_fileno(lf.cu_die, lr->file);
+
+ if (!lr->file || lf.fno) {
+ if (lr->function)
+ find_line_range_by_func(&lf);
+ else {
+ lf.lno_s = lr->start;
+ if (!lr->end)
+ lf.lno_e = (Dwarf_Unsigned)-1;
+ else
+ lf.lno_e = lr->end;
+ find_line_range_by_line(&lf);
+ }
+ /* Get the real file path */
+ if (lf.found)
+ cu_get_filename(lf.cu_die, lf.fno, &lr->path);
+ }
+ dwarf_dealloc(__dw_debug, lf.cu_die, DW_DLA_DIE);
+ }
+ ret = dwarf_finish(__dw_debug, &__dw_error);
+ DIE_IF(ret != DW_DLV_OK);
+ return lf.found;
+}
+
char *probes[MAX_PROBES]; /* Output buffers (will be allocated)*/
};
+/* Line number container */
+struct line_node {
+ struct list_head list;
+ unsigned int line;
+};
+
+/* Line range */
+struct line_range {
+ char *file; /* File name */
+ char *function; /* Function name */
+ unsigned int start; /* Start line number */
+ unsigned int end; /* End line number */
+ unsigned int offset; /* Start line offset */
+ char *path; /* Real path name */
+ struct list_head line_list; /* Visible lines */
+};
+
#ifndef NO_LIBDWARF
extern int find_probepoint(int fd, struct probe_point *pp);
+extern int find_line_range(int fd, struct line_range *lr);
/* Workaround for undefined _MIPS_SZLONG bug in libdwarf.h: */
#ifndef _MIPS_SZLONG
char *buf; /* Current output buffer */
int len; /* Length of output buffer */
};
+
+struct line_finder {
+ struct line_range *lr; /* Target line range */
+
+ Dwarf_Unsigned fno; /* File number */
+ Dwarf_Unsigned lno_s; /* Start line number */
+ Dwarf_Unsigned lno_e; /* End line number */
+ Dwarf_Addr addr_s; /* Start address */
+ Dwarf_Addr addr_e; /* End address */
+ Dwarf_Die cu_die; /* Current CU */
+ int found;
+};
+
#endif /* NO_LIBDWARF */
#endif /*_PROBE_FINDER_H */
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff