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nexedi
tsn-measures
Commits
44a513e1
Commit
44a513e1
authored
May 01, 2020
by
Joanne Hugé
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Plain Diff
Add more comments, make graph tracer and affinity optionnal
parent
5c96fd63
Changes
3
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Showing
3 changed files
with
35 additions
and
13 deletions
+35
-13
clock-res/src/clockres.c
clock-res/src/clockres.c
+29
-10
clock-res/src/tracer.c
clock-res/src/tracer.c
+5
-2
clock-res/src/tracer.h
clock-res/src/tracer.h
+1
-1
No files found.
clock-res/src/clockres.c
View file @
44a513e1
...
...
@@ -25,6 +25,7 @@ typedef struct thread_param {
int
priority
;
int
max_cycles
;
int
enable_tracing
;
int
enable_affinity
;
uint64_t
interval
;
uint64_t
latency_threshold
;
thread_stat_t
stat
;
...
...
@@ -33,6 +34,7 @@ typedef struct thread_param {
typedef
struct
main_param
{
int
refresh_rate
;
int
enable_tracing
;
int
enable_graph
;
}
main_param_t
;
static
void
process_options
(
int
argc
,
char
*
argv
[],
thread_param_t
*
param
,
...
...
@@ -53,11 +55,13 @@ static void *timerthread(void *p) {
thread_param_t
*
param
=
(
thread_param_t
*
)
p
;
thread_stat_t
*
stat
=
&
param
->
stat
;
if
(
param
->
enable_affinity
)
{
// Set thread CPU affinity
CPU_ZERO
(
&
mask
);
CPU_SET
(
1
,
&
mask
);
if
(
sched_setaffinity
(
0
,
sizeof
(
mask
),
&
mask
))
printf
(
"Could not set CPU affinity to CPU #1
\n
"
);
}
// Set thread priority
priority
.
sched_priority
=
param
->
priority
;
...
...
@@ -67,16 +71,20 @@ static void *timerthread(void *p) {
stat
->
max_res
=
0
;
stat
->
min_res
=
UINT64_MAX
;
// Start tracing
if
(
param
->
enable_tracing
)
tracing
(
1
);
// Measurement loop
for
(
stat
->
nb_cycles
=
0
;;
stat
->
nb_cycles
++
)
{
if
(
param
->
max_cycles
&&
(
stat
->
nb_cycles
>=
param
->
max_cycles
))
break
;
// Two successive clock measurement to determine clock_gettime latency
clock_gettime
(
CLOCK_ID
,
&
previous
);
clock_gettime
(
CLOCK_ID
,
&
current
);
diff
=
calcdiff_ns
(
current
,
previous
);
// If the latency hits the tracing threshold, stop tracing
if
(
param
->
enable_tracing
&&
(
diff
>
param
->
latency_threshold
))
{
sprintf
(
time_measured_string
,
"Diff measured: %"
PRIu64
"
\n
"
,
diff
);
tracemark
(
time_measured_string
);
...
...
@@ -88,6 +96,8 @@ static void *timerthread(void *p) {
break
;
}
// Update the thread statistics, so that the non real-time
// thread can print it
stat
->
max_res
=
max
(
stat
->
max_res
,
diff
);
stat
->
min_res
=
min
(
stat
->
min_res
,
diff
);
...
...
@@ -111,14 +121,19 @@ int main(int argc, char *argv[]) {
param
.
max_cycles
=
100000
;
param
.
priority
=
99
;
param
.
enable_tracing
=
0
;
param
.
enable_affinity
=
0
;
main_param
.
enable_tracing
=
0
;
main_param
.
enable_graph
=
0
;
main_param
.
refresh_rate
=
10000
;
// Process bash options
process_options
(
argc
,
argv
,
&
param
,
&
main_param
);
// Enable ftrace
if
(
main_param
.
enable_tracing
)
{
param
.
enable_tracing
=
1
;
setup_tracer
();
setup_tracer
(
main_param
.
enable_graph
);
}
usleep
(
10000
);
...
...
@@ -149,7 +164,7 @@ int main(int argc, char *argv[]) {
static
void
process_options
(
int
argc
,
char
*
argv
[],
thread_param_t
*
param
,
main_param_t
*
main_param
)
{
for
(;;)
{
int
c
=
getopt
(
argc
,
argv
,
"l:p:i:r:
b:f
"
);
int
c
=
getopt
(
argc
,
argv
,
"l:p:i:r:
f:ag
"
);
if
(
c
==
-
1
)
break
;
...
...
@@ -163,14 +178,18 @@ static void process_options(int argc, char *argv[], thread_param_t *param,
case
'i'
:
param
->
interval
=
atoi
(
optarg
);
break
;
case
'b'
:
param
->
latency_threshold
=
atoi
(
optarg
);
break
;
case
'r'
:
main_param
->
refresh_rate
=
atoi
(
optarg
);
break
;
case
'f'
:
main_param
->
enable_tracing
=
1
;
param
->
latency_threshold
=
atoi
(
optarg
);
break
;
case
'a'
:
param
->
enable_affinity
=
1
;
break
;
case
'g'
:
main_param
->
enable_graph
=
1
;
break
;
default:
exit
(
EXIT_FAILURE
);
...
...
clock-res/src/tracer.c
View file @
44a513e1
...
...
@@ -74,7 +74,7 @@ static void setkernvar(const char *name, char *value) {
fprintf
(
stderr
,
"could not set %s to %s
\n
"
,
name
,
value
);
}
void
setup_tracer
(
void
)
{
void
setup_tracer
(
int
enable_graph
)
{
char
trace_path
[
MAX_PATH
];
char
tracemark_path
[
MAX_PATH
];
...
...
@@ -85,6 +85,9 @@ void setup_tracer(void) {
fileprefix
=
debugfileprefix
;
// Clear old traces by setting tracer to nop first
setkernvar
(
"current_tracer"
,
"nop"
);
if
(
enable_graph
)
setkernvar
(
"current_tracer"
,
"function_graph"
);
else
setkernvar
(
"current_tracer"
,
"function"
);
// Open tracing_on file
...
...
clock-res/src/tracer.h
View file @
44a513e1
#ifndef TRACER_H
#define TRACER_H
void
setup_tracer
(
void
);
void
setup_tracer
(
int
enable_graph
);
void
tracing
(
int
on
);
void
tracemark
(
char
*
s
);
...
...
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