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ZONE(9): Fix UMA_PCPU_ALLOC_SIZE

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Using CACHE_LINE_SIZE for UMA_PCPU_ALLOC_SIZE was a huge memory waste
since the backend memory allocator is page based.
This commit is contained in:
Sebastian Huber 2019-02-12 08:29:55 +01:00
parent 1c3a92d81e
commit b3bbfdfe91
2 changed files with 7 additions and 9 deletions
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12
freebsd/sys/sys/pcpu.h
View File

@ -170,6 +170,7 @@ extern uintptr_t dpcpu_off[];
#endif /* _KERNEL */ #endif /* _KERNEL */
#ifndef __rtems__
/* /*
* This structure maps out the global data that needs to be kept on a * This structure maps out the global data that needs to be kept on a
* per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR * per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR
@ -177,7 +178,6 @@ extern uintptr_t dpcpu_off[];
* defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>. * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
*/ */
struct pcpu { struct pcpu {
#ifndef __rtems__
struct thread *pc_curthread; /* Current thread */ struct thread *pc_curthread; /* Current thread */
struct thread *pc_idlethread; /* Idle thread */ struct thread *pc_idlethread; /* Idle thread */
struct thread *pc_fpcurthread; /* Fp state owner */ struct thread *pc_fpcurthread; /* Fp state owner */
@ -208,10 +208,10 @@ struct pcpu {
* if only to make kernel debugging easier. * if only to make kernel debugging easier.
*/ */
PCPU_MD_FIELDS; PCPU_MD_FIELDS;
#else /* __rtems__ */
int pc_dummy;
#endif /* __rtems__ */
} __aligned(CACHE_LINE_SIZE); } __aligned(CACHE_LINE_SIZE);
#else /* __rtems__ */
struct pcpu;
#endif /* __rtems__ */
#ifdef _KERNEL #ifdef _KERNEL
@ -227,9 +227,9 @@ extern struct pcpu *cpuid_to_pcpu[];
#endif #endif
#define curvidata PCPU_GET(vidata) #define curvidata PCPU_GET(vidata)
#ifndef __rtems__
#define UMA_PCPU_ALLOC_SIZE PAGE_SIZE #define UMA_PCPU_ALLOC_SIZE PAGE_SIZE
#ifndef __rtems__
#ifdef CTASSERT #ifdef CTASSERT
#if defined(__i386__) || defined(__amd64__) #if defined(__i386__) || defined(__amd64__)
/* Required for counters(9) to work on x86. */ /* Required for counters(9) to work on x86. */
@ -242,8 +242,6 @@ CTASSERT(sizeof(struct pcpu) == UMA_PCPU_ALLOC_SIZE);
CTASSERT((PAGE_SIZE / sizeof(struct pcpu)) * sizeof(struct pcpu) == PAGE_SIZE); CTASSERT((PAGE_SIZE / sizeof(struct pcpu)) * sizeof(struct pcpu) == PAGE_SIZE);
#endif /* UMA_PCPU_ALLOC_SIZE && x86 */ #endif /* UMA_PCPU_ALLOC_SIZE && x86 */
#endif /* CTASSERT */ #endif /* CTASSERT */
#else /* __rtems__ */
#define UMA_PCPU_ALLOC_SIZE sizeof(struct pcpu)
#endif /* __rtems__ */ #endif /* __rtems__ */
/* Accessor to elements allocated via UMA_ZONE_PCPU zone. */ /* Accessor to elements allocated via UMA_ZONE_PCPU zone. */

4
rtemsbsd/include/machine/counter.h
View File

@ -42,7 +42,7 @@ static inline uint64_t
counter_u64_read_one(uint64_t *p, int cpu) counter_u64_read_one(uint64_t *p, int cpu)
{ {
return (*((uint64_t *)((char *)p + sizeof(struct pcpu) * cpu))); return (*((uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu)));
} }
static inline uint64_t static inline uint64_t
@ -65,7 +65,7 @@ counter_u64_zero_inline(counter_u64_t c)
uint32_t cpu; uint32_t cpu;
for (cpu = 0; cpu < _SMP_Get_processor_count(); ++cpu) { for (cpu = 0; cpu < _SMP_Get_processor_count(); ++cpu) {
*((uint64_t *)((char *)c + sizeof(struct pcpu) * cpu)) = 0; *((uint64_t *)((char *)c + UMA_PCPU_ALLOC_SIZE * cpu)) = 0;
} }
} }
#endif #endif