mirror of
https://github.com/varun-r-mallya/sysprof.git
synced 2025-12-31 20:36:25 +00:00
libsysprof: add instrument to record scheduler switching
This is to allow us to look at what processes were running when as a way to get a high-level overview of usage.
This commit is contained in:
Christian Hergert
@ -50,6 +50,7 @@ libsysprof_public_sources = [
|
||||
'sysprof-proxied-instrument.c',
|
||||
'sysprof-recording.c',
|
||||
'sysprof-sampler.c',
|
||||
'sysprof-scheduler-details.c',
|
||||
'sysprof-spawnable.c',
|
||||
'sysprof-subprocess-output.c',
|
||||
'sysprof-symbol.c',
|
||||
@ -114,6 +115,7 @@ libsysprof_public_headers = [
|
||||
'sysprof-proxied-instrument.h',
|
||||
'sysprof-recording.h',
|
||||
'sysprof-sampler.h',
|
||||
'sysprof-scheduler-details.h',
|
||||
'sysprof-spawnable.h',
|
||||
'sysprof-subprocess-output.h',
|
||||
'sysprof-symbol.h',
|
||||
|
||||
397
src/libsysprof/sysprof-scheduler-details.c
Normal file
397
src/libsysprof/sysprof-scheduler-details.c
Normal file
@ -0,0 +1,397 @@
|
||||
/* sysprof-scheduler-details.c
|
||||
*
|
||||
* Copyright 2023 Christian Hergert <chergert@redhat.com>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-3.0-or-later
|
||||
*/
|
||||
|
||||
#include "config.h"
|
||||
|
||||
#include "sysprof-instrument-private.h"
|
||||
#include "sysprof-perf-event-stream-private.h"
|
||||
#include "sysprof-scheduler-details.h"
|
||||
#include "sysprof-recording-private.h"
|
||||
|
||||
#include "line-reader-private.h"
|
||||
|
||||
struct _SysprofSchedulerDetails
|
||||
{
|
||||
SysprofInstrument parent_instance;
|
||||
|
||||
SysprofRecording *recording;
|
||||
DexFuture *cancellable;
|
||||
GPtrArray *streams;
|
||||
gint64 *last_switch_times;
|
||||
|
||||
gint64 started_at;
|
||||
gint64 ended_at;
|
||||
|
||||
gint64 sched_switch_id;
|
||||
gint64 prev_comm_offset;
|
||||
gint64 prev_pid_offset;
|
||||
gint64 prev_state_offset;
|
||||
};
|
||||
|
||||
struct _SysprofSchedulerDetailsClass
|
||||
{
|
||||
SysprofInstrumentClass parent_class;
|
||||
};
|
||||
|
||||
G_DEFINE_FINAL_TYPE (SysprofSchedulerDetails, sysprof_scheduler_details, SYSPROF_TYPE_INSTRUMENT)
|
||||
|
||||
static void
|
||||
sysprof_scheduler_details_event_cb (const SysprofPerfEvent *event,
|
||||
guint cpu,
|
||||
gpointer user_data)
|
||||
{
|
||||
SysprofSchedulerDetails *self = user_data;
|
||||
const guint8 *raw;
|
||||
gint64 begin, end;
|
||||
glong prev_state;
|
||||
char prev_comm[16];
|
||||
char name[8];
|
||||
GPid prev_pid;
|
||||
|
||||
g_assert (SYSPROF_IS_SCHEDULER_DETAILS (self));
|
||||
|
||||
if (event->header.type != PERF_RECORD_SAMPLE)
|
||||
return;
|
||||
|
||||
begin = self->last_switch_times[cpu];
|
||||
end = event->tracepoint.time;
|
||||
|
||||
if (begin == 0)
|
||||
goto finish;
|
||||
|
||||
if (self->started_at == 0 || end < self->started_at)
|
||||
return;
|
||||
|
||||
if (self->ended_at != 0 && begin > self->ended_at)
|
||||
return;
|
||||
|
||||
raw = event->tracepoint.raw;
|
||||
|
||||
memcpy (&prev_pid, raw + self->prev_pid_offset, sizeof prev_pid);
|
||||
memcpy (&prev_state, raw + self->prev_state_offset, sizeof prev_state);
|
||||
memcpy (&prev_comm[0], raw + self->prev_comm_offset, sizeof prev_comm);
|
||||
|
||||
prev_comm[sizeof prev_comm-1] = 0;
|
||||
|
||||
g_snprintf (name, sizeof name, "CPU %u", cpu);
|
||||
|
||||
sysprof_capture_writer_add_mark (self->recording->writer,
|
||||
begin,
|
||||
cpu,
|
||||
event->tracepoint.pid,
|
||||
end - begin,
|
||||
"Scheduler",
|
||||
name,
|
||||
prev_comm);
|
||||
|
||||
finish:
|
||||
self->last_switch_times[cpu] = end;
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_scheduler_details_parse_field (SysprofSchedulerDetails *self,
|
||||
char **parts)
|
||||
{
|
||||
G_GNUC_UNUSED gboolean _signed = FALSE;
|
||||
gint64 offset = -1;
|
||||
gint64 size = 0;
|
||||
|
||||
g_assert (SYSPROF_IS_SCHEDULER_DETAILS (self));
|
||||
g_assert (parts != NULL);
|
||||
|
||||
for (guint i = 1; parts[i]; i++)
|
||||
{
|
||||
if (g_str_has_prefix (parts[i], "offset:"))
|
||||
offset = g_ascii_strtoll (parts[i] + strlen ("offset:"), NULL, 10);
|
||||
else if (g_str_has_prefix (parts[i], "size:"))
|
||||
size = g_ascii_strtoll (parts[i] + strlen ("size:"), NULL, 10);
|
||||
else if (g_str_has_prefix (parts[i], "signed:"))
|
||||
_signed = parts[i][strlen ("signed:")] == '1';
|
||||
}
|
||||
|
||||
if (offset == -1)
|
||||
return;
|
||||
|
||||
if (g_str_equal (parts[0], "field:char prev_comm[16];"))
|
||||
{
|
||||
if (size == 16)
|
||||
self->prev_comm_offset = offset;
|
||||
}
|
||||
else if (g_str_equal (parts[0], "field:pid_t prev_pid;"))
|
||||
{
|
||||
if (size == 4)
|
||||
self->prev_pid_offset = offset;
|
||||
}
|
||||
else if (g_str_equal (parts[0], "field:long prev_state;"))
|
||||
{
|
||||
if (size == sizeof (glong))
|
||||
self->prev_state_offset = offset;
|
||||
}
|
||||
}
|
||||
|
||||
static gboolean
|
||||
sysprof_scheduler_details_parse_format (SysprofSchedulerDetails *self,
|
||||
char *format)
|
||||
{
|
||||
LineReader reader;
|
||||
char *line;
|
||||
gsize line_len;
|
||||
|
||||
g_assert (SYSPROF_IS_SCHEDULER_DETAILS (self));
|
||||
g_assert (format != NULL);
|
||||
|
||||
line_reader_init (&reader, format, -1);
|
||||
|
||||
while ((line = line_reader_next (&reader, &line_len)))
|
||||
{
|
||||
line[line_len] = 0;
|
||||
|
||||
if (g_str_has_prefix (line, "ID: "))
|
||||
{
|
||||
if (!(self->sched_switch_id = g_ascii_strtoll (line + strlen ("ID: "), NULL, 10)))
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
if (g_str_has_prefix (line, "\t"))
|
||||
{
|
||||
g_auto(GStrv) parts = g_strsplit (g_strstrip (line), "\t", 0);
|
||||
|
||||
sysprof_scheduler_details_parse_field (self, parts);
|
||||
}
|
||||
}
|
||||
|
||||
return self->sched_switch_id > 0 &&
|
||||
self->prev_comm_offset > 0 &&
|
||||
self->prev_state_offset > 0 &&
|
||||
self->prev_pid_offset > 0;
|
||||
}
|
||||
|
||||
static DexFuture *
|
||||
sysprof_scheduler_details_prepare_fiber (gpointer user_data)
|
||||
{
|
||||
SysprofSchedulerDetails *self = user_data;
|
||||
g_autoptr(GDBusConnection) bus = NULL;
|
||||
g_autoptr(GPtrArray) futures = NULL;
|
||||
g_autoptr(GVariant) format_reply = NULL;
|
||||
g_autoptr(GError) error = NULL;
|
||||
g_autofree char *format = NULL;
|
||||
int n_cpu;
|
||||
|
||||
g_assert (SYSPROF_IS_SCHEDULER_DETAILS (self));
|
||||
g_assert (SYSPROF_IS_RECORDING (self->recording));
|
||||
|
||||
if (!(bus = dex_await_object (dex_bus_get (G_BUS_TYPE_SYSTEM), &error)))
|
||||
goto handle_error;
|
||||
|
||||
if (!(format_reply = dex_await_variant (dex_dbus_connection_call (bus,
|
||||
"org.gnome.Sysprof3",
|
||||
"/org/gnome/Sysprof3",
|
||||
"org.gnome.Sysprof3.Service",
|
||||
"GetProcFile",
|
||||
g_variant_new ("(^ay)", "/sys/kernel/debug/tracing/events/sched/sched_switch/format"),
|
||||
G_VARIANT_TYPE ("(ay)"),
|
||||
G_DBUS_CALL_FLAGS_ALLOW_INTERACTIVE_AUTHORIZATION,
|
||||
G_MAXINT),
|
||||
&error)))
|
||||
goto handle_error;
|
||||
|
||||
g_variant_get (format_reply, "(^ay)", &format);
|
||||
|
||||
if (!sysprof_scheduler_details_parse_format (self, format))
|
||||
{
|
||||
error = g_error_new_literal (G_IO_ERROR,
|
||||
G_IO_ERROR_INVALID_DATA,
|
||||
"Could not parse data in tracepoint format");
|
||||
goto handle_error;
|
||||
}
|
||||
|
||||
futures = g_ptr_array_new_with_free_func (dex_unref);
|
||||
n_cpu = g_get_num_processors ();
|
||||
|
||||
self->last_switch_times = g_new0 (gint64, n_cpu);
|
||||
|
||||
for (int cpu = 0; cpu < n_cpu; cpu++)
|
||||
{
|
||||
struct perf_event_attr attr = {0};
|
||||
|
||||
attr.type = PERF_TYPE_TRACEPOINT;
|
||||
attr.type = PERF_TYPE_TRACEPOINT;
|
||||
attr.sample_type = PERF_SAMPLE_RAW |
|
||||
PERF_SAMPLE_IP |
|
||||
PERF_SAMPLE_TID |
|
||||
PERF_SAMPLE_IDENTIFIER |
|
||||
PERF_SAMPLE_TIME;
|
||||
attr.config = self->sched_switch_id;
|
||||
attr.sample_period = 1;
|
||||
|
||||
#ifdef HAVE_PERF_CLOCKID
|
||||
attr.clockid = sysprof_clock;
|
||||
attr.use_clockid = 1;
|
||||
#endif
|
||||
|
||||
attr.size = sizeof attr;
|
||||
|
||||
g_ptr_array_add (futures,
|
||||
sysprof_perf_event_stream_new (bus,
|
||||
&attr,
|
||||
cpu,
|
||||
-1,
|
||||
0,
|
||||
sysprof_scheduler_details_event_cb,
|
||||
self,
|
||||
NULL));
|
||||
}
|
||||
|
||||
/* Create perf stream per-cpu to get sched:sched_switch */
|
||||
if (!dex_await (dex_future_allv ((DexFuture **)futures->pdata, futures->len), &error))
|
||||
goto handle_error;
|
||||
|
||||
for (int i = 0; i < futures->len; i++)
|
||||
{
|
||||
DexFuture *future = g_ptr_array_index (futures, i);
|
||||
g_autoptr(SysprofPerfEventStream) stream = dex_await_object (dex_ref (future), NULL);
|
||||
|
||||
g_assert (stream != NULL);
|
||||
g_assert (SYSPROF_IS_PERF_EVENT_STREAM (stream));
|
||||
|
||||
/* We'll start processing these once start_time is set
|
||||
* for recording. That way we don't miss anything when
|
||||
* racing to record.
|
||||
*/
|
||||
if (sysprof_perf_event_stream_enable (stream, NULL))
|
||||
g_ptr_array_add (self->streams, g_object_ref (stream));
|
||||
}
|
||||
|
||||
return dex_future_new_for_boolean (TRUE);
|
||||
|
||||
handle_error:
|
||||
g_assert (error != NULL);
|
||||
|
||||
_sysprof_recording_diagnostic (self->recording,
|
||||
"Scheduler",
|
||||
"Failed to register scheduler tracepoints: %s",
|
||||
error->message);
|
||||
|
||||
return dex_future_new_for_error (g_steal_pointer (&error));
|
||||
}
|
||||
|
||||
static DexFuture *
|
||||
sysprof_scheduler_details_prepare (SysprofInstrument *instrument,
|
||||
SysprofRecording *recording)
|
||||
{
|
||||
SysprofSchedulerDetails *self = (SysprofSchedulerDetails *)instrument;
|
||||
|
||||
g_assert (SYSPROF_IS_SCHEDULER_DETAILS (self));
|
||||
g_assert (SYSPROF_IS_RECORDING (recording));
|
||||
|
||||
g_set_object (&self->recording, recording);
|
||||
|
||||
return dex_scheduler_spawn (NULL, 0,
|
||||
sysprof_scheduler_details_prepare_fiber,
|
||||
g_object_ref (self),
|
||||
g_object_unref);
|
||||
}
|
||||
|
||||
static DexFuture *
|
||||
sysprof_scheduler_details_record_fiber (gpointer user_data)
|
||||
{
|
||||
SysprofSchedulerDetails *self = user_data;
|
||||
|
||||
g_assert (SYSPROF_IS_SCHEDULER_DETAILS (self));
|
||||
g_assert (SYSPROF_IS_RECORDING (self->recording));
|
||||
g_assert (DEX_IS_FUTURE (self->cancellable));
|
||||
|
||||
self->started_at = SYSPROF_CAPTURE_CURRENT_TIME;
|
||||
dex_await (dex_ref (self->cancellable), NULL);
|
||||
self->ended_at = SYSPROF_CAPTURE_CURRENT_TIME;
|
||||
|
||||
return dex_future_new_for_boolean (TRUE);
|
||||
}
|
||||
|
||||
static DexFuture *
|
||||
sysprof_scheduler_details_record (SysprofInstrument *instrument,
|
||||
SysprofRecording *recording,
|
||||
GCancellable *cancellable)
|
||||
{
|
||||
SysprofSchedulerDetails *self = (SysprofSchedulerDetails *)instrument;
|
||||
|
||||
g_assert (SYSPROF_IS_SCHEDULER_DETAILS (self));
|
||||
g_assert (SYSPROF_IS_RECORDING (recording));
|
||||
g_assert (recording == self->recording);
|
||||
g_assert (self->cancellable == NULL);
|
||||
|
||||
self->cancellable = dex_cancellable_new_from_cancellable (cancellable);
|
||||
|
||||
return dex_scheduler_spawn (NULL, 0,
|
||||
sysprof_scheduler_details_record_fiber,
|
||||
g_object_ref (self),
|
||||
g_object_unref);
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_scheduler_details_dispose (GObject *object)
|
||||
{
|
||||
SysprofSchedulerDetails *self = (SysprofSchedulerDetails *)object;
|
||||
|
||||
if (self->streams != NULL)
|
||||
{
|
||||
for (guint i = 0; i < self->streams->len; i++)
|
||||
{
|
||||
SysprofPerfEventStream *stream = g_ptr_array_index (self->streams, i);
|
||||
sysprof_perf_event_stream_disable (stream, NULL);
|
||||
}
|
||||
|
||||
g_clear_pointer (&self->streams, g_ptr_array_unref);
|
||||
}
|
||||
|
||||
g_clear_object (&self->recording);
|
||||
g_clear_pointer (&self->last_switch_times, g_free);
|
||||
dex_clear (&self->cancellable);
|
||||
|
||||
G_OBJECT_CLASS (sysprof_scheduler_details_parent_class)->dispose (object);
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_scheduler_details_class_init (SysprofSchedulerDetailsClass *klass)
|
||||
{
|
||||
GObjectClass *object_class = G_OBJECT_CLASS (klass);
|
||||
SysprofInstrumentClass *instrument_class = SYSPROF_INSTRUMENT_CLASS (klass);
|
||||
|
||||
object_class->dispose = sysprof_scheduler_details_dispose;
|
||||
|
||||
instrument_class->prepare = sysprof_scheduler_details_prepare;
|
||||
instrument_class->record = sysprof_scheduler_details_record;
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_scheduler_details_init (SysprofSchedulerDetails *self)
|
||||
{
|
||||
self->sched_switch_id = -1;
|
||||
self->prev_comm_offset = -1;
|
||||
self->prev_pid_offset = -1;
|
||||
self->prev_state_offset = -1;
|
||||
self->streams = g_ptr_array_new_with_free_func (g_object_unref);
|
||||
}
|
||||
|
||||
SysprofInstrument *
|
||||
sysprof_scheduler_details_new (void)
|
||||
{
|
||||
return g_object_new (SYSPROF_TYPE_SCHEDULER_DETAILS, NULL);
|
||||
}
|
||||
42
src/libsysprof/sysprof-scheduler-details.h
Normal file
42
src/libsysprof/sysprof-scheduler-details.h
Normal file
@ -0,0 +1,42 @@
|
||||
/* sysprof-scheduler-details.h
|
||||
*
|
||||
* Copyright 2023 Christian Hergert <chergert@redhat.com>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-3.0-or-later
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include "sysprof-instrument.h"
|
||||
|
||||
G_BEGIN_DECLS
|
||||
|
||||
#define SYSPROF_TYPE_SCHEDULER_DETAILS (sysprof_scheduler_details_get_type())
|
||||
#define SYSPROF_IS_SCHEDULER_DETAILS(obj) G_TYPE_CHECK_INSTANCE_TYPE(obj, SYSPROF_TYPE_SCHEDULER_DETAILS)
|
||||
#define SYSPROF_SCHEDULER_DETAILS(obj) G_TYPE_CHECK_INSTANCE_CAST(obj, SYSPROF_TYPE_SCHEDULER_DETAILS, SysprofSchedulerDetails)
|
||||
#define SYSPROF_SCHEDULER_DETAILS_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, SYSPROF_TYPE_SCHEDULER_DETAILS, SysprofSchedulerDetailsClass)
|
||||
|
||||
typedef struct _SysprofSchedulerDetails SysprofSchedulerDetails;
|
||||
typedef struct _SysprofSchedulerDetailsClass SysprofSchedulerDetailsClass;
|
||||
|
||||
SYSPROF_AVAILABLE_IN_ALL
|
||||
GType sysprof_scheduler_details_get_type (void) G_GNUC_CONST;
|
||||
SYSPROF_AVAILABLE_IN_ALL
|
||||
SysprofInstrument *sysprof_scheduler_details_new (void);
|
||||
|
||||
G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofSchedulerDetails, g_object_unref)
|
||||
|
||||
G_END_DECLS
|
||||
@ -76,6 +76,7 @@ G_BEGIN_DECLS
|
||||
# include "sysprof-proxied-instrument.h"
|
||||
# include "sysprof-recording.h"
|
||||
# include "sysprof-sampler.h"
|
||||
# include "sysprof-scheduler-details.h"
|
||||
# include "sysprof-spawnable.h"
|
||||
# include "sysprof-subprocess-output.h"
|
||||
# include "sysprof-symbol.h"
|
||||
|
||||
@ -203,6 +203,8 @@ main (int argc,
|
||||
if (memprof)
|
||||
sysprof_profiler_add_instrument (profiler, sysprof_malloc_tracing_new ());
|
||||
|
||||
sysprof_profiler_add_instrument (profiler, sysprof_scheduler_details_new ());
|
||||
|
||||
if (tracer)
|
||||
sysprof_profiler_add_instrument (profiler, sysprof_tracer_new ());
|
||||
else
|
||||
|
||||
Reference in New Issue
Block a user