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libsysprof: add kallsyms to capture file

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This can be used by the kernel symbol resolver to resolve symbols on a
different machine than where the capture is performed.
This commit is contained in:
Christian Hergert
2019-05-27 17:18:20 -07:00
parent 318e9e300c
commit b8c30e3285
1 changed files with 36 additions and 5 deletions
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41
src/libsysprof/sysprof-proc-source.c
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@ -51,6 +51,7 @@ struct _SysprofProcSource
GObject parent_instance;
SysprofCaptureWriter *writer;
GArray *pids;
gint kallsyms_fd;
};
static void source_iface_init (SysprofSourceInterface *iface);
@ -406,16 +407,24 @@ sysprof_proc_source_get_process_info_cb (GObject *object,
g_assert (SYSPROF_IS_HELPERS (helpers));
g_assert (G_IS_ASYNC_RESULT (result));
g_assert (SYSPROF_IS_PROC_SOURCE (self));
g_assert (self->kallsyms_fd == -1);
if (!sysprof_helpers_get_process_info_finish (helpers, result, &info, &error))
{
sysprof_source_emit_failed (SYSPROF_SOURCE (self), error);
return;
}
else
{
sysprof_proc_source_populate (self, info);
sysprof_source_emit_finished (SYSPROF_SOURCE (self));
}
sysprof_proc_source_populate (self, info);
/* TODO: Make this optional? */
sysprof_helpers_get_proc_fd (helpers,
"/proc/kallsyms",
NULL,
&self->kallsyms_fd,
NULL);
sysprof_source_emit_finished (SYSPROF_SOURCE (self));
}
static void
@ -441,6 +450,21 @@ sysprof_proc_source_stop (SysprofSource *source)
g_assert (SYSPROF_IS_PROC_SOURCE (self));
/* We opened kallsyms when starting the capture, now read it and
* save it to the end of the file.
*/
if (self->kallsyms_fd != -1)
{
sysprof_capture_writer_add_file_fd (self->writer,
SYSPROF_CAPTURE_CURRENT_TIME,
-1,
-1,
"/proc/kallsyms",
self->kallsyms_fd);
close (self->kallsyms_fd);
self->kallsyms_fd = -1;
}
g_clear_pointer (&self->writer, sysprof_capture_writer_unref);
}
@ -491,6 +515,12 @@ sysprof_proc_source_finalize (GObject *object)
{
SysprofProcSource *self = (SysprofProcSource *)object;
if (self->kallsyms_fd != -1)
{
close (self->kallsyms_fd);
self->kallsyms_fd = -1;
}
g_clear_pointer (&self->writer, sysprof_capture_writer_unref);
g_clear_pointer (&self->pids, g_array_unref);
@ -509,6 +539,7 @@ static void
sysprof_proc_source_init (SysprofProcSource *self)
{
self->pids = g_array_new (FALSE, FALSE, sizeof (GPid));
self->kallsyms_fd = -1;
}
SysprofSource *