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Commit a288bd65 authored by Richard Kennedy's avatar Richard Kennedy Committed by Rusty Russell
Browse files

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: default avatarRichard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 9b73a584

include/linux/module.h

+7 −6
Original line number Diff line number Diff line
@@ -368,34 +368,35 @@ struct module 
	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