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libsysprof-profile: setup mmap for perf mapping

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This commit is contained in:
Christian Hergert
2023-06-04 00:02:58 -07:00
parent 5b5916bdcd
commit a6ca0eb2d7
1 changed files with 29 additions and 1 deletions
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30
src/libsysprof-profile/sysprof-perf-event-stream.c
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@ -347,7 +347,31 @@ sysprof_perf_event_stream_new_cb (GObject *object,
g_variant_get (ret, "(h)", &handle); g_variant_get (ret, "(h)", &handle);
if (-1 != (fd = g_unix_fd_list_get (fd_list, handle, &error))) if (-1 != (fd = g_unix_fd_list_get (fd_list, handle, &error)))
self->perf_fd = fd; {
gsize map_size;
guint8 *map;
self->perf_fd = fd;
self->perf_fd_tag = g_source_add_unix_fd (self->source, fd, G_IO_ERR);
map_size = N_PAGES * sysprof_getpagesize () + sysprof_getpagesize ();
map = mmap (NULL, map_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if ((gpointer)map == MAP_FAILED)
{
int errsv = errno;
g_set_error_literal (&error,
G_IO_ERROR,
g_io_error_from_errno (errsv),
g_strerror (errsv));
}
else
{
self->map = (gpointer)map;
self->map_data = map + sysprof_getpagesize ();
self->tail = 0;
}
}
} }
if (error != NULL) if (error != NULL)
@ -447,6 +471,8 @@ sysprof_perf_event_stream_enable (SysprofPerfEventStream *self,
self->active = TRUE; self->active = TRUE;
g_source_modify_unix_fd (self->source, self->perf_fd_tag, G_IO_IN);
g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_ACTIVE]); g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_ACTIVE]);
return TRUE; return TRUE;
@ -473,6 +499,8 @@ sysprof_perf_event_stream_disable (SysprofPerfEventStream *self,
self->active = FALSE; self->active = FALSE;
g_source_modify_unix_fd (self->source, self->perf_fd_tag, G_IO_ERR);
g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_ACTIVE]); g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_ACTIVE]);
return TRUE; return TRUE;