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slavio_timer: avoid structure holes spotted by pahole 

Report from pahole on amd64 host:
struct SLAVIO_TIMERState {
	SysBusDevice               busdev;               /*     0  5648 */
	/* --- cacheline 88 boundary (5632 bytes) was 16 bytes ago --- */
	uint32_t                   num_cpus;             /*  5648     4 */

	/* XXX 4 bytes hole, try to pack */

	CPUTimerState              cputimer[17];         /*  5656   816 */
	/* --- cacheline 101 boundary (6464 bytes) was 8 bytes ago --- */
	uint32_t                   cputimer_mode;        /*  6472     4 */

	/* size: 6480, cachelines: 102 */
	/* sum members: 6472, holes: 1, sum holes: 4 */
	/* padding: 4 */
	/* last cacheline: 16 bytes */
};	/* definitions: 1 */

struct CPUTimerState {
	qemu_irq                   irq;                  /*     0     8 */
	ptimer_state *             timer;                /*     8     8 */
	uint32_t                   count;                /*    16     4 */
	uint32_t                   counthigh;            /*    20     4 */
	uint32_t                   reached;              /*    24     4 */

	/* XXX 4 bytes hole, try to pack */

	uint64_t                   limit;                /*    32     8 */
	uint32_t                   running;              /*    40     4 */

	/* size: 48, cachelines: 1 */
	/* sum members: 40, holes: 1, sum holes: 4 */
	/* padding: 4 */
	/* last cacheline: 48 bytes */
};	/* definitions: 1 */

Fix by rearranging the structures to avoid padding.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2011-08-07 19:00:23 +00:00
parent 94ac5cd20c
commit f90074f493
1 changed files with 3 additions and 3 deletions
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6
hw/slavio_timer.c
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@ -48,16 +48,16 @@ typedef struct CPUTimerState {
qemu_irq irq;
ptimer_state *timer;
uint32_t count, counthigh, reached;
uint64_t limit;
// processor only
/* processor only */
uint32_t running;
uint64_t limit;
} CPUTimerState;
typedef struct SLAVIO_TIMERState {
SysBusDevice busdev;
uint32_t num_cpus;
CPUTimerState cputimer[MAX_CPUS + 1];
uint32_t cputimer_mode;
CPUTimerState cputimer[MAX_CPUS + 1];
} SLAVIO_TIMERState;
typedef struct TimerContext {