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/* sp-callgraph-profile.c
*
* Copyright (C) 2016 Christian Hergert <christian@hergert.me>
*
* 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/>.
*/
/* Sysprof -- Sampling, systemwide CPU profiler
* Copyright 2009-2012 Soeren Sandmann and others
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <glib/gi18n.h>
#include <string.h>
#include <unistd.h>
#include "sp-address.h"
#include "callgraph/sp-callgraph-profile.h"
#include "callgraph/sp-callgraph-profile-private.h"
#include "capture/sp-capture-reader.h"
#include "symbols/sp-elf-symbol-resolver.h"
#include "symbols/sp-jitmap-symbol-resolver.h"
#include "util/sp-map-lookaside.h"
#include "symbols/sp-kernel-symbol-resolver.h"
#include "util/sp-selection.h"
#include "util/stackstash.h"
#define CHECK_CANCELLABLE_INTERVAL 100
struct _SpCallgraphProfile
{
GObject parent_instance;
SpCaptureReader *reader;
SpSelection *selection;
StackStash *stash;
GStringChunk *symbols;
GHashTable *tags;
};
typedef struct
{
SpCaptureReader *reader;
SpSelection *selection;
} Generate;
static void profile_iface_init (SpProfileInterface *iface);
G_DEFINE_TYPE_EXTENDED (SpCallgraphProfile, sp_callgraph_profile, G_TYPE_OBJECT, 0,
G_IMPLEMENT_INTERFACE (SP_TYPE_PROFILE, profile_iface_init))
enum {
PROP_0,
PROP_SELECTION,
N_PROPS
};
static GParamSpec *properties [N_PROPS];
SpProfile *
sp_callgraph_profile_new (void)
{
return g_object_new (SP_TYPE_CALLGRAPH_PROFILE, NULL);
}
SpProfile *
sp_callgraph_profile_new_with_selection (SpSelection *selection)
{
return g_object_new (SP_TYPE_CALLGRAPH_PROFILE,
"selection", selection,
NULL);
}
static void
sp_callgraph_profile_finalize (GObject *object)
{
SpCallgraphProfile *self = (SpCallgraphProfile *)object;
g_clear_pointer (&self->symbols, g_string_chunk_free);
g_clear_pointer (&self->stash, stack_stash_unref);
g_clear_pointer (&self->reader, sp_capture_reader_unref);
g_clear_pointer (&self->tags, g_hash_table_unref);
g_clear_object (&self->selection);
G_OBJECT_CLASS (sp_callgraph_profile_parent_class)->finalize (object);
}
static void
sp_callgraph_profile_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
SpCallgraphProfile *self = SP_CALLGRAPH_PROFILE (object);
switch (prop_id)
{
case PROP_SELECTION:
g_value_set_object (value, self->selection);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
sp_callgraph_profile_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
SpCallgraphProfile *self = SP_CALLGRAPH_PROFILE (object);
switch (prop_id)
{
case PROP_SELECTION:
self->selection = g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
sp_callgraph_profile_class_init (SpCallgraphProfileClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = sp_callgraph_profile_finalize;
object_class->get_property = sp_callgraph_profile_get_property;
object_class->set_property = sp_callgraph_profile_set_property;
properties [PROP_SELECTION] =
g_param_spec_object ("selection",
"Selection",
"The selection for filtering the callgraph",
SP_TYPE_SELECTION,
(G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
g_object_class_install_properties (object_class, N_PROPS, properties);
}
static void
sp_callgraph_profile_init (SpCallgraphProfile *self)
{
self->symbols = g_string_chunk_new (getpagesize ());
self->tags = g_hash_table_new (g_str_hash, g_str_equal);
}
static void
sp_callgraph_profile_set_reader (SpProfile *profile,
SpCaptureReader *reader)
{
SpCallgraphProfile *self = (SpCallgraphProfile *)profile;
g_assert (SP_IS_CALLGRAPH_PROFILE (self));
g_assert (reader != NULL);
g_clear_pointer (&self->reader, sp_capture_reader_unref);
self->reader = sp_capture_reader_ref (reader);
}
static const gchar *
sp_callgraph_profile_intern_string_take (SpCallgraphProfile *self,
gchar *str)
{
const gchar *ret;
g_assert (SP_IS_CALLGRAPH_PROFILE (self));
g_assert (str != NULL);
ret = g_string_chunk_insert_const (self->symbols, str);
g_free (str);
return ret;
}
static const gchar *
sp_callgraph_profile_intern_string (SpCallgraphProfile *self,
const gchar *str)
{
g_assert (SP_IS_CALLGRAPH_PROFILE (self));
g_assert (str != NULL);
return g_string_chunk_insert_const (self->symbols, str);
}
static void
sp_callgraph_profile_generate_worker (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
SpCallgraphProfile *self = source_object;
Generate *gen = task_data;
SpCaptureReader *reader;
SpSelection *selection;
g_autoptr(GArray) resolved = NULL;
g_autoptr(GHashTable) maps_by_pid = NULL;
g_autoptr(GHashTable) cmdlines = NULL;
g_autoptr(GPtrArray) resolvers = NULL;
SpCaptureFrameType type;
StackStash *stash = NULL;
StackStash *resolved_stash = NULL;
guint count = 0;
gboolean ret = FALSE;
g_assert (G_IS_TASK (task));
g_assert (gen != NULL);
g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
reader = gen->reader;
selection = gen->selection;
maps_by_pid = g_hash_table_new_full (NULL, NULL, NULL, (GDestroyNotify)sp_map_lookaside_free);
cmdlines = g_hash_table_new (NULL, NULL);
stash = stack_stash_new (NULL);
resolved_stash = stack_stash_new (NULL);
resolvers = g_ptr_array_new_with_free_func (g_object_unref);
g_ptr_array_add (resolvers, sp_kernel_symbol_resolver_new ());
g_ptr_array_add (resolvers, sp_elf_symbol_resolver_new ());
g_ptr_array_add (resolvers, sp_jitmap_symbol_resolver_new ());
for (guint j = 0; j < resolvers->len; j++)
{
SpSymbolResolver *resolver = g_ptr_array_index (resolvers, j);
sp_capture_reader_reset (reader);
sp_symbol_resolver_load (resolver, reader);
}
sp_capture_reader_reset (reader);
/*
* The resolved pointer array is where we stash the names for the
* instruction pointers to pass to the stash stack. All the strings
* need to be deduplicated so that pointer comparison works as if we
* did instruction-pointer comparison.
*/
resolved = g_array_new (FALSE, TRUE, sizeof (guint64));
while (sp_capture_reader_peek_type (reader, &type))
{
const SpCaptureProcess *pr;
const gchar *cmdline;
if (type != SP_CAPTURE_FRAME_PROCESS)
{
if (!sp_capture_reader_skip (reader))
goto failure;
continue;
}
if (NULL == (pr = sp_capture_reader_read_process (reader)))
goto failure;
cmdline = g_strdup_printf ("[%s]", pr->cmdline);
g_hash_table_insert (cmdlines,
GINT_TO_POINTER (pr->frame.pid),
(gchar *)sp_callgraph_profile_intern_string (self, cmdline));
}
if (g_task_return_error_if_cancelled (task))
goto cleanup;
sp_capture_reader_reset (reader);
/*
* Walk through all of the sample events and resolve instruction-pointers
* to symbol names by loading the particular map and extracting the symbol
* name. If we wanted to support dynamic systems, we'd want to extend this
* to parse information from captured data about the languages jit'd code.
*/
while (sp_capture_reader_peek_type (reader, &type))
{
SpAddressContext last_context = SP_ADDRESS_CONTEXT_NONE;
const SpCaptureSample *sample;
StackNode *node;
StackNode *iter;
const gchar *cmdline;
guint len = 5;
if (type != SP_CAPTURE_FRAME_SAMPLE)
{
if (!sp_capture_reader_skip (reader))
goto failure;
continue;
}
if (++count == CHECK_CANCELLABLE_INTERVAL)
{
if (g_task_return_error_if_cancelled (task))
goto cleanup;
}
if (NULL == (sample = sp_capture_reader_read_sample (reader)))
goto failure;
if (!sp_selection_contains (selection, sample->frame.time))
continue;
if (sample->n_addrs == 0)
continue;
cmdline = g_hash_table_lookup (cmdlines, GINT_TO_POINTER (sample->frame.pid));
#if 0
/* This assertion appears to hold true, but since we're taking in
* untrusted data from capture files, it's not safe to assume. But in
* practice it is.
*/
g_assert (sp_address_is_context_switch (sample->addrs[0], &last_context));
last_context = SP_ADDRESS_CONTEXT_NONE;
#endif
node = stack_stash_add_trace (stash, sample->addrs, sample->n_addrs, 1);
for (iter = node; iter != NULL; iter = iter->parent)
len++;
if (G_UNLIKELY (resolved->len < len))
g_array_set_size (resolved, len);
len = 0;
for (iter = node; iter != NULL; iter = iter->parent)
{
SpAddressContext context = SP_ADDRESS_CONTEXT_NONE;
SpAddress address = iter->data;
const gchar *symbol = NULL;
if (sp_address_is_context_switch (address, &context))
{
if (last_context)
symbol = sp_address_context_to_string (last_context);
else
symbol = NULL;
last_context = context;
}
else
{
for (guint j = 0; j < resolvers->len; j++)
{
SpSymbolResolver *resolver = g_ptr_array_index (resolvers, j);
GQuark tag = 0;
gchar *str;
str = sp_symbol_resolver_resolve_with_context (resolver,
sample->frame.time,
sample->frame.pid,
last_context,
address,
&tag);
if (str != NULL)
{
symbol = sp_callgraph_profile_intern_string_take (self, str);
if (tag != 0)
g_hash_table_insert (self->tags, (gchar *)symbol, GSIZE_TO_POINTER (tag));
break;
}
}
}
if (symbol != NULL)
g_array_index (resolved, SpAddress, len++) = POINTER_TO_U64 (symbol);
}
if (last_context && last_context != SP_ADDRESS_CONTEXT_USER)
{
/* Kernel threads do not have a user part, so we end up here
* without ever getting a user context. If this happens,
* add the '- - kernel - - ' name, so that kernel threads
* are properly blamed on the kernel
*/
const gchar *name = sp_address_context_to_string (last_context);
g_array_index (resolved, SpAddress, len++) = POINTER_TO_U64 (name);
}
if (cmdline != NULL)
g_array_index (resolved, guint64, len++) = POINTER_TO_U64 (cmdline);
g_array_index (resolved, guint64, len++) = POINTER_TO_U64 ("[Everything]");
stack_stash_add_trace (resolved_stash, (SpAddress *)(gpointer)resolved->data, len, 1);
}
ret = TRUE;
failure:
if (ret == FALSE)
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"%s",
_("Sysprof was unable to generate a callgraph from the system capture."));
else
g_task_return_pointer (task, g_steal_pointer (&resolved_stash), (GDestroyNotify)stack_stash_unref);
cleanup:
g_clear_pointer (&resolved_stash, stack_stash_unref);
g_clear_pointer (&stash, stack_stash_unref);
}
static void
generate_free (Generate *generate)
{
sp_capture_reader_unref (generate->reader);
g_clear_object (&generate->selection);
g_slice_free (Generate, generate);
}
static void
sp_callgraph_profile_generate (SpProfile *profile,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
SpCallgraphProfile *self = (SpCallgraphProfile *)profile;
Generate *gen;
g_autoptr(GTask) task = NULL;
g_assert (SP_IS_CALLGRAPH_PROFILE (self));
g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
gen = g_slice_new0 (Generate);
gen->reader = sp_capture_reader_copy (self->reader);
gen->selection = sp_selection_copy (self->selection);
task = g_task_new (self, cancellable, callback, user_data);
g_task_set_task_data (task, gen, (GDestroyNotify)generate_free);
g_task_run_in_thread (task, sp_callgraph_profile_generate_worker);
}
static gboolean
sp_callgraph_profile_generate_finish (SpProfile *profile,
GAsyncResult *result,
GError **error)
{
SpCallgraphProfile *self = (SpCallgraphProfile *)profile;
StackStash *stash;
g_assert (SP_IS_CALLGRAPH_PROFILE (self));
g_assert (G_IS_TASK (result));
stash = g_task_propagate_pointer (G_TASK (result), error);
if (stash != NULL)
{
if (stash != self->stash)
{
g_clear_pointer (&self->stash, stack_stash_unref);
self->stash = g_steal_pointer (&stash);
}
g_clear_pointer (&stash, stack_stash_unref);
return TRUE;
}
return FALSE;
}
static void
profile_iface_init (SpProfileInterface *iface)
{
iface->generate = sp_callgraph_profile_generate;
iface->generate_finish = sp_callgraph_profile_generate_finish;
iface->set_reader = sp_callgraph_profile_set_reader;
}
StackStash *
sp_callgraph_profile_get_stash (SpCallgraphProfile *self)
{
g_return_val_if_fail (SP_IS_CALLGRAPH_PROFILE (self), NULL);
return self->stash;
}
GQuark
sp_callgraph_profile_get_tag (SpCallgraphProfile *self,
const gchar *symbol)
{
g_return_val_if_fail (SP_IS_CALLGRAPH_PROFILE (self), 0);
return GPOINTER_TO_SIZE (g_hash_table_lookup (self->tags, symbol));
}
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