Commit d0959024 authored Oct 20, 2010 by Richard Kennedy Committed by Thomas Gleixner Oct 21, 2010

timer_list: Remove alignment padding on 64 bit when CONFIG_TIMER_STATS



Reorder struct timer_list to remove 8 bytes of alignment padding on 64
bit builds when CONFIG_TIMER_STATS is selected.

timer_list is widely used across the kernel so many structures will
benefit and shrink in size.

For example, with my config on x86_64
	per_cpu_dm_data shrinks from 136 to 128 bytes
and
	ahci_port_priv shrinks from 1032 to 968 bytes.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent a386b5af

include/linux/timer.h

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -24,9 +24,9 @@ struct timer_list {
	int slack;		int slack;

	#ifdef CONFIG_TIMER_STATS		#ifdef CONFIG_TIMER_STATS
			int start_pid;
	void *start_site;		void *start_site;
	char start_comm[16];		char start_comm[16];
	int start_pid;
	#endif		#endif
	#ifdef CONFIG_LOCKDEP		#ifdef CONFIG_LOCKDEP
	struct lockdep_map lockdep_map;		struct lockdep_map lockdep_map;

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