The patch titled
timer_list: remove alignment padding on 64 bit when CONFIG_TIMER_STATS
has been added to the -mm tree. Its filename is
timer_list-remove-alignment-padding-on-64-bit-when-config_timer_stats.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: timer_list: remove alignment padding on 64 bit when CONFIG_TIMER_STATS
From: Richard Kennedy <richard@xxxxxxxxxxxxxxx>
Reorder 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@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/timer.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/timer.h~timer_list-remove-alignment-padding-on-64-bit-when-config_timer_stats include/linux/timer.h
--- a/include/linux/timer.h~timer_list-remove-alignment-padding-on-64-bit-when-config_timer_stats
+++ a/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;
_
Patches currently in -mm which might be from richard@xxxxxxxxxxxxxxx are
timer_list-remove-alignment-padding-on-64-bit-when-config_timer_stats.patch
buffer_head-remove-redundant-test-from-wait_on_buffer.patch
writeback-reduce-calls-to-global_page_state-in-balance_dirty_pages.patch
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