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sparc64: optimize loads in clock_sched()

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In clock sched we now have three loads:
	- Function pointer
	- quotient for multiplication
	- offset

However, it is possible to improve performance substantially, by
guaranteeing that all three loads are from the same cacheline.

By moving these three values first in sparc64_tick_ops, and by having
tick_operations 64-byte aligned we guarantee this.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Tatashin
2017-06-12 16:41:44 -04:00
committed by David S. Miller
parent b5dd4d807f
commit 178bf2b9a2
2 changed files with 12 additions and 10 deletions
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5
arch/sparc/include/asm/timer_64.h
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@@ -9,7 +9,12 @@
#include <linux/types.h>
#include <linux/init.h>
/* The most frequently accessed fields should be first,
* to fit into the same cacheline.
*/
struct sparc64_tick_ops {
unsigned long ticks_per_nsec_quotient;
unsigned long offset;
unsigned long long (*get_tick)(void);
int (*add_compare)(unsigned long);
unsigned long softint_mask;