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perf trace: Ignore "overwrite" field if present in /events/header_page 

That is not used in perf where we have the LOST events.

Without this patch we get:

[root@doppio ~]# perf lock report | head -3
  Warning: Error: expected 'data' but read 'overwrite'

So, to make the same perf command work with kernels with and without
this field, introduce variants for the parsing routines to not warn the
user in such case.

Discussed-with: Steven Rostedt <rostedt@goodmis.org>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2010-04-05 18:01:10 -03:00
parent 854c5548df
commit e9e94e3bd8
1 changed files with 34 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
tools/perf/util/trace-event-parse.c
View File

@ -37,6 +37,8 @@ int header_page_ts_offset;
int header_page_ts_size;
int header_page_size_offset;
int header_page_size_size;
int header_page_overwrite_offset;
int header_page_overwrite_size;
int header_page_data_offset;
int header_page_data_size;
@ -628,16 +630,19 @@ static int test_type(enum event_type type, enum event_type expect)
return 0;
}
static int test_type_token(enum event_type type, char *token,
enum event_type expect, const char *expect_tok)
static int __test_type_token(enum event_type type, char *token,
enum event_type expect, const char *expect_tok,
bool warn)
{
if (type != expect) {
if (warn)
warning("Error: expected type %d but read %d",
expect, type);
return -1;
}
if (strcmp(token, expect_tok) != 0) {
if (warn)
warning("Error: expected '%s' but read '%s'",
expect_tok, token);
return -1;
@ -645,6 +650,12 @@ static int test_type_token(enum event_type type, char *token,
return 0;
}
static int test_type_token(enum event_type type, char *token,
enum event_type expect, const char *expect_tok)
{
return __test_type_token(type, token, expect, expect_tok, true);
}
static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
{
enum event_type type;
@ -661,7 +672,8 @@ static int read_expect_type(enum event_type expect, char **tok)
return __read_expect_type(expect, tok, 1);
}
static int __read_expected(enum event_type expect, const char *str, int newline_ok)
static int __read_expected(enum event_type expect, const char *str,
int newline_ok, bool warn)
{
enum event_type type;
char *token;
@ -672,21 +684,26 @@ static int __read_expected(enum event_type expect, const char *str, int newline_
else
type = read_token_item(&token);
ret = test_type_token(type, token, expect, str);
ret = __test_type_token(type, token, expect, str, warn);
free_token(token);
return ret;
}
static int read_expected_warn(enum event_type expect, const char *str, bool warn)
{
return __read_expected(expect, str, 1, warn);
}
static int read_expected(enum event_type expect, const char *str)
{
return __read_expected(expect, str, 1);
return __read_expected(expect, str, 1, true);
}
static int read_expected_item(enum event_type expect, const char *str)
{
return __read_expected(expect, str, 0);
return __read_expected(expect, str, 0, true);
}
static char *event_read_name(void)
@ -3088,7 +3105,7 @@ static void print_args(struct print_arg *args)
}
static void parse_header_field(const char *field,
int *offset, int *size)
int *offset, int *size, bool warn)
{
char *token;
int type;
@ -3103,7 +3120,7 @@ static void parse_header_field(const char *field,
goto fail;
free_token(token);
if (read_expected(EVENT_ITEM, field) < 0)
if (read_expected_warn(EVENT_ITEM, field, warn) < 0)
return;
if (read_expected(EVENT_OP, ";") < 0)
return;
@ -3160,11 +3177,13 @@ int parse_header_page(char *buf, unsigned long size)
init_input_buf(buf, size);
parse_header_field("timestamp", &header_page_ts_offset,
&header_page_ts_size);
&header_page_ts_size, true);
parse_header_field("commit", &header_page_size_offset,
&header_page_size_size);
&header_page_size_size, true);
parse_header_field("overwrite", &header_page_overwrite_offset,
&header_page_overwrite_size, false);
parse_header_field("data", &header_page_data_offset,
&header_page_data_size);
&header_page_data_size, true);
return 0;
}