module: remove 64 bit alignment padding from struct module with CONFIG_TRACE*
Reorder struct module to remove 24 bytes of alignment padding on 64 bit
builds when the CONFIG_TRACE options are selected. This allows the
structure to fit into one fewer cache lines, and its size drops from 592
to 568 on x86_64.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/include/linux/module.h b/include/linux/module.h
index 23996ad..65cc6cc 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -368,34 +368,35 @@
struct module_notes_attrs *notes_attrs;
#endif
+ /* The command line arguments (may be mangled). People like
+ keeping pointers to this stuff */
+ char *args;
+
#ifdef CONFIG_SMP
/* Per-cpu data. */
void __percpu *percpu;
unsigned int percpu_size;
#endif
- /* The command line arguments (may be mangled). People like
- keeping pointers to this stuff */
- char *args;
#ifdef CONFIG_TRACEPOINTS
- struct tracepoint * const *tracepoints_ptrs;
unsigned int num_tracepoints;
+ struct tracepoint * const *tracepoints_ptrs;
#endif
#ifdef HAVE_JUMP_LABEL
struct jump_entry *jump_entries;
unsigned int num_jump_entries;
#endif
#ifdef CONFIG_TRACING
- const char **trace_bprintk_fmt_start;
unsigned int num_trace_bprintk_fmt;
+ const char **trace_bprintk_fmt_start;
#endif
#ifdef CONFIG_EVENT_TRACING
struct ftrace_event_call **trace_events;
unsigned int num_trace_events;
#endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
- unsigned long *ftrace_callsites;
unsigned int num_ftrace_callsites;
+ unsigned long *ftrace_callsites;
#endif
#ifdef CONFIG_MODULE_UNLOAD