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From: Richard Kennedy on 26 Jul 2010 05:00
Re-order structure 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(a)rsk.demon.co.uk>

---
patch against v2.6.35-rc6
compiled & tested on x86_64

regards
Richard


diff --git a/include/linux/timer.h b/include/linux/timer.h
index ea965b8..14a6fd4 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -24,9 +24,9 @@ struct timer_list {
int slack;

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


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