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sysprof/lib/sources/sp-memory-source.c
Christian Hergert 52f411e1de memory: add memory source for basic mem stats
2018-10-12 17:11:42 -07:00

495 lines
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/* sp-memory-source.c
*
* Copyright 2018 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"
#define G_LOG_DOMAIN "sp-memory-source"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include "sp-clock.h"
#include "sources/sp-memory-source.h"
#define BUF_SIZE 4096
struct _SpMemorySource
{
GObject parent_instance;
/* Capture writer to deliver samples */
SpCaptureWriter *writer;
/* 4k stat buffer for reading proc */
gchar *stat_buf;
/* Array of MemStat */
GArray *mem_stats;
/* Timeout to perform polling */
guint timer_source;
};
typedef struct
{
GPid pid;
int stat_fd;
/* Keep in this order, so we can address from total */
SpCaptureCounterValue mem_total;
SpCaptureCounterValue mem_avail;
SpCaptureCounterValue mem_free;
/* Keep in this order, so we can address from size */
SpCaptureCounterValue mem_size;
SpCaptureCounterValue mem_resident;
SpCaptureCounterValue mem_shared;
SpCaptureCounterValue mem_text;
SpCaptureCounterValue mem_data;
guint counter_ids[5];
} MemStat;
static void source_iface_init (SpSourceInterface *iface);
G_DEFINE_TYPE_WITH_CODE (SpMemorySource, sp_memory_source, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (SP_TYPE_SOURCE, source_iface_init))
static GHashTable *keys;
static void
mem_stat_open (MemStat *st)
{
g_assert (st != NULL);
g_assert (st->stat_fd == -1);
if (st->pid != -1)
{
g_autofree gchar *path = g_strdup_printf ("/proc/%d/statm", st->pid);
if (-1 == (st->stat_fd = open (path, O_RDONLY)))
g_warning ("Failed to access statm for pid %d", st->pid);
}
else
{
st->stat_fd = open ("/proc/meminfo", O_RDONLY);
}
}
static void
mem_stat_close (MemStat *st)
{
g_assert (st != NULL);
if (st->stat_fd != -1)
{
close (st->stat_fd);
st->stat_fd = -1;
}
}
static void
mem_stat_parse_statm (MemStat *st,
gchar *buf)
{
g_assert (st != NULL);
sscanf (buf,
"%"G_GINT64_FORMAT" "
"%"G_GINT64_FORMAT" "
"%"G_GINT64_FORMAT" "
"%"G_GINT64_FORMAT" "
"%*1c "
"%"G_GINT64_FORMAT,
&st->mem_size.v64,
&st->mem_resident.v64,
&st->mem_shared.v64,
&st->mem_text.v64,
&st->mem_data.v64);
}
static void
mem_stat_parse_meminfo (MemStat *st,
gchar *buf)
{
gchar *bufptr = buf;
gchar *save = NULL;
g_assert (st != NULL);
for (;;)
{
goffset off;
gchar *key;
gchar *value;
gchar *unit;
gint64 v64;
gint64 *v64ptr;
/* Get the data key name */
if (!(key = strtok_r (bufptr, " \n\t:", &save)))
break;
bufptr = NULL;
/* Offset from self to save value. Stop after getting to
* last value we care about.
*/
if (!(off = GPOINTER_TO_UINT (g_hash_table_lookup (keys, key))))
break;
/* Get the data value */
if (!(value = strtok_r (bufptr, " \n\t:", &save)))
break;
/* Parse the numeric value of this column */
v64 = g_ascii_strtoll (value, NULL, 10);
if ((v64 == G_MININT64 || v64 == G_MAXINT64) && errno == ERANGE)
break;
/* Get the data unit */
unit = strtok_r (bufptr, " \n\t:", &save);
if (g_strcmp0 (unit, "kB") == 0)
v64 *= 1024;
else if (g_strcmp0 (unit, "mB") == 0)
v64 *= 1024 * 1024;
v64ptr = (gint64 *)(gpointer)(((gchar *)st) + off);
*v64ptr = v64;
}
}
static void
mem_stat_poll (MemStat *st,
gchar *stat_buf)
{
gssize r;
g_assert (st != NULL);
g_assert (st->stat_fd != -1);
/* Seek to begin of FD to reset the proc read */
if ((r = lseek (st->stat_fd, 0, SEEK_SET)) < 0)
return;
/* Now read the updated proc buffer */
if ((r = read (st->stat_fd, stat_buf, BUF_SIZE)) < 0)
return;
if (r < BUF_SIZE)
stat_buf[r] = '\0';
stat_buf[BUF_SIZE-1] = '\0';
if (st->pid == -1)
mem_stat_parse_meminfo (st, stat_buf);
else
mem_stat_parse_statm (st, stat_buf);
}
static void
mem_stat_publish (MemStat *st,
SpCaptureWriter *writer,
gint64 current_time)
{
g_assert (st != NULL);
g_assert (writer != NULL);
sp_capture_writer_set_counters (writer,
current_time,
-1,
st->pid,
st->counter_ids,
st->pid == -1 ? &st->mem_total : &st->mem_size,
st->pid == -1 ? 3 : 5);
}
/**
* sp_memory_source_new:
*
* Create a new #SpMemorySource.
*
* Use this source to record basic memory statistics about the system
* such as Available, Free, and Total Memory.
*
* Returns: (transfer full): a newly created #SpMemorySource
* Since: 3.32
*/
SpSource *
sp_memory_source_new (void)
{
return g_object_new (SP_TYPE_MEMORY_SOURCE, NULL);
}
static void
sp_memory_source_finalize (GObject *object)
{
SpMemorySource *self = (SpMemorySource *)object;
if (self->timer_source != 0)
{
g_source_remove (self->timer_source);
self->timer_source = 0;
}
g_clear_pointer (&self->stat_buf, g_free);
g_clear_pointer (&self->writer, sp_capture_writer_unref);
g_clear_pointer (&self->mem_stats, g_array_unref);
G_OBJECT_CLASS (sp_memory_source_parent_class)->finalize (object);
}
static void
sp_memory_source_class_init (SpMemorySourceClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = sp_memory_source_finalize;
keys = g_hash_table_new (g_str_hash, g_str_equal);
#define ADD_OFFSET(n,o) \
g_hash_table_insert (keys, (gchar *)n, GUINT_TO_POINTER (o))
ADD_OFFSET ("MemTotal", G_STRUCT_OFFSET (MemStat, mem_total));
ADD_OFFSET ("MemFree", G_STRUCT_OFFSET (MemStat, mem_free));
ADD_OFFSET ("MemAvailable", G_STRUCT_OFFSET (MemStat, mem_avail));
#undef ADD_OFFSET
}
static void
sp_memory_source_init (SpMemorySource *self)
{
self->stat_buf = g_malloc (BUF_SIZE);
self->mem_stats = g_array_new (FALSE, FALSE, sizeof (MemStat));
}
static void
sp_memory_source_set_writer (SpSource *source,
SpCaptureWriter *writer)
{
SpMemorySource *self = (SpMemorySource *)source;
g_assert (SP_IS_SOURCE (self));
g_assert (writer != NULL);
g_assert (self->writer == NULL);
self->writer = sp_capture_writer_ref (writer);
}
static void
sp_memory_source_prepare (SpSource *source)
{
SpMemorySource *self = (SpMemorySource *)source;
g_assert (SP_IS_MEMORY_SOURCE (self));
g_assert (self->writer != NULL);
/* If no pids are registered, setup a system memory stat */
if (self->mem_stats->len == 0)
{
MemStat st = {0};
st.pid = -1;
st.stat_fd = -1;
g_array_append_val (self->mem_stats, st);
}
/* Open FDs to all the necessary files in proc. We will re-use
* them to avoid re-opening files later.
*/
for (guint i = 0; i < self->mem_stats->len; i++)
{
MemStat *st = &g_array_index (self->mem_stats, MemStat, i);
SpCaptureCounter counters[5];
guint base;
mem_stat_open (st);
for (guint j = 0; j < G_N_ELEMENTS (counters); j++)
g_strlcpy (counters[j].category, "Memory", sizeof counters[j].category);
if (st->pid == -1)
{
base = sp_capture_writer_request_counter (self->writer, 3);
g_strlcpy (counters[0].name, "Total", sizeof counters[0].name);
g_strlcpy (counters[1].name, "Available", sizeof counters[1].name);
g_strlcpy (counters[2].name, "Free", sizeof counters[2].name);
g_strlcpy (counters[0].description, "", sizeof counters[0].description);
g_strlcpy (counters[1].description, "", sizeof counters[1].description);
g_strlcpy (counters[2].description, "", sizeof counters[2].description);
counters[0].id = st->counter_ids[0] = base;
counters[1].id = st->counter_ids[1] = base + 1;
counters[2].id = st->counter_ids[2] = base + 2;
counters[0].type = SP_CAPTURE_COUNTER_INT64;
counters[1].type = SP_CAPTURE_COUNTER_INT64;
counters[2].type = SP_CAPTURE_COUNTER_INT64;
counters[0].value.v64 = 0;
counters[1].value.v64 = 0;
counters[2].value.v64 = 0;
sp_capture_writer_define_counters (self->writer,
SP_CAPTURE_CURRENT_TIME,
-1,
-1,
counters,
3);
}
else
{
base = sp_capture_writer_request_counter (self->writer, 5);
g_strlcpy (counters[0].name, "Size", sizeof counters[0].name);
g_strlcpy (counters[1].name, "Resident", sizeof counters[1].name);
g_strlcpy (counters[2].name, "Shared", sizeof counters[2].name);
g_strlcpy (counters[3].name, "Text", sizeof counters[3].name);
g_strlcpy (counters[4].name, "Data", sizeof counters[4].name);
g_strlcpy (counters[0].description, "", sizeof counters[0].description);
g_strlcpy (counters[1].description, "", sizeof counters[1].description);
g_strlcpy (counters[2].description, "", sizeof counters[2].description);
g_strlcpy (counters[3].description, "", sizeof counters[3].description);
g_strlcpy (counters[4].description, "", sizeof counters[4].description);
counters[0].id = st->counter_ids[0] = base;
counters[1].id = st->counter_ids[1] = base + 1;
counters[2].id = st->counter_ids[2] = base + 2;
counters[3].id = st->counter_ids[3] = base + 3;
counters[4].id = st->counter_ids[4] = base + 4;
counters[0].type = SP_CAPTURE_COUNTER_INT64;
counters[1].type = SP_CAPTURE_COUNTER_INT64;
counters[2].type = SP_CAPTURE_COUNTER_INT64;
counters[3].type = SP_CAPTURE_COUNTER_INT64;
counters[4].type = SP_CAPTURE_COUNTER_INT64;
counters[0].value.v64 = 0;
counters[1].value.v64 = 0;
counters[2].value.v64 = 0;
counters[3].value.v64 = 0;
counters[4].value.v64 = 0;
sp_capture_writer_define_counters (self->writer,
SP_CAPTURE_CURRENT_TIME,
-1,
st->pid,
counters,
5);
}
}
sp_source_emit_ready (SP_SOURCE (self));
}
static gboolean
sp_memory_source_timer_cb (SpMemorySource *self)
{
gint64 current_time;
g_assert (SP_IS_MEMORY_SOURCE (self));
g_assert (self->writer != NULL);
current_time = sp_clock_get_current_time ();
for (guint i = 0; i < self->mem_stats->len; i++)
{
MemStat *st = &g_array_index (self->mem_stats, MemStat, i);
mem_stat_poll (st, self->stat_buf);
mem_stat_publish (st, self->writer, current_time);
}
return G_SOURCE_CONTINUE;
}
static void
sp_memory_source_start (SpSource *source)
{
SpMemorySource *self = (SpMemorySource *)source;
g_assert (SP_IS_MEMORY_SOURCE (self));
/* Poll 20x/sec for memory stats */
self->timer_source = g_timeout_add_full (G_PRIORITY_HIGH,
1000 / 20,
(GSourceFunc)sp_memory_source_timer_cb,
self,
NULL);
}
static void
sp_memory_source_stop (SpSource *source)
{
SpMemorySource *self = (SpMemorySource *)source;
g_assert (SP_IS_MEMORY_SOURCE (self));
if (self->timer_source != 0)
{
g_source_remove (self->timer_source);
self->timer_source = 0;
}
for (guint i = 0; i < self->mem_stats->len; i++)
{
MemStat *st = &g_array_index (self->mem_stats, MemStat, i);
mem_stat_close (st);
}
sp_source_emit_finished (source);
}
static void
sp_memory_source_add_pid (SpSource *source,
GPid pid)
{
SpMemorySource *self = (SpMemorySource *)source;
MemStat st = {0};
g_assert (SP_IS_MEMORY_SOURCE (self));
st.pid = pid;
st.stat_fd = -1;
g_array_append_val (self->mem_stats, st);
}
static void
source_iface_init (SpSourceInterface *iface)
{
iface->set_writer = sp_memory_source_set_writer;
iface->prepare = sp_memory_source_prepare;
iface->start = sp_memory_source_start;
iface->stop = sp_memory_source_stop;
iface->add_pid = sp_memory_source_add_pid;
}
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