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Pad struct pcpu so that its size is denominator of PAGE_SIZE. This
is done to reduce memory waste in UMA_PCPU_ZONE zones.

Sponsored by:	Nginx, Inc.
This commit is contained in:
glebius 2013-04-08 19:19:10 +00:00
parent 7f9db020a2
commit 8c6eba117e
8 changed files with 57 additions and 13 deletions
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4
sys/amd64/include/pcpu.h
View File

@ -77,7 +77,9 @@
/* Pointer to the CPU TSS descriptor */ \
struct system_segment_descriptor *pc_tss; \
u_int pc_cmci_mask /* MCx banks for CMCI */ \
PCPU_XEN_FIELDS
PCPU_XEN_FIELDS; \
char __pad[293] /* be divisor of PAGE_SIZE \
after cache alignment */
#ifdef _KERNEL

7
sys/arm/include/pcpu.h
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@ -48,12 +48,13 @@ struct vmspace;
unsigned int pc_vfpmvfr0; \
unsigned int pc_vfpmvfr1; \
struct thread *pc_vfpcthread; \
struct pmap *pc_curpmap;
struct pmap *pc_curpmap; \
char __pad[133]
#else
#define PCPU_MD_FIELDS
#define PCPU_MD_FIELDS \
char __pad[157]
#endif
#ifdef _KERNEL
struct pcb;

10
sys/i386/include/pcpu.h
View File

@ -74,18 +74,22 @@ struct shadow_time_info {
int pc_resched_irq; \
int pc_callfunc_irq; \
int pc_virq_to_irq[NR_VIRQS]; \
int pc_ipi_to_irq[NR_IPIS]
int pc_ipi_to_irq[NR_IPIS]; \
char __pad[77]
#elif defined(XENHVM)
#define PCPU_XEN_FIELDS \
; \
unsigned int pc_last_processed_l1i; \
unsigned int pc_last_processed_l2i
unsigned int pc_last_processed_l2i; \
char __pad[229]
#else /* !XEN && !XENHVM */
#define PCPU_XEN_FIELDS
#define PCPU_XEN_FIELDS \
; \
char __pad[237]
#endif

3
sys/ia64/include/pcpu.h
View File

@ -64,7 +64,8 @@ struct pcpu_md {
#define PCPU_MD_FIELDS \
uint32_t pc_acpi_id; /* ACPI CPU id. */ \
struct pcpu_md pc_md /* MD fields. */
struct pcpu_md pc_md; /* MD fields. */ \
char __pad[1265]
#ifdef _KERNEL

18
sys/mips/include/pcpu.h
View File

@ -33,13 +33,29 @@
#include <machine/pte.h>
#define PCPU_MD_FIELDS \
#define PCPU_MD_COMMON_FIELDS \
pd_entry_t *pc_segbase; /* curthread segbase */ \
struct pmap *pc_curpmap; /* pmap of curthread */ \
u_int32_t pc_next_asid; /* next ASID to alloc */ \
u_int32_t pc_asid_generation; /* current ASID generation */ \
u_int pc_pending_ipis; /* IPIs pending to this CPU */
#ifdef __mips_n64
#define PCPU_MD_MIPS64_FIELDS \
PCPU_MD_COMMON_FIELDS \
char __pad[61]
#else
#define PCPU_MD_MIPS32_FIELDS \
PCPU_MD_COMMON_FIELDS \
char __pad[133]
#endif
#ifdef __mips_n64
#define PCPU_MD_FIELDS PCPU_MD_MIPS64_FIELDS
#else
#define PCPU_MD_FIELDS PCPU_MD_MIPS32_FIELDS
#endif
#ifdef _KERNEL
extern char pcpu_space[MAXCPU][PAGE_SIZE * 2];

9
sys/powerpc/include/pcpu.h
View File

@ -51,13 +51,15 @@ struct pmap;
register_t pc_disisave[CPUSAVE_LEN]; \
register_t pc_dbsave[CPUSAVE_LEN];
#define PCPU_MD_AIM32_FIELDS
#define PCPU_MD_AIM32_FIELDS \
/* char __pad[0] */
#define PCPU_MD_AIM64_FIELDS \
struct slb pc_slb[64]; \
struct slb **pc_userslb; \
register_t pc_slbsave[18]; \
uint8_t pc_slbstack[1024];
uint8_t pc_slbstack[1024]; \
char __pad[1137]
#ifdef __powerpc64__
#define PCPU_MD_AIM_FIELDS PCPU_MD_AIM64_FIELDS
@ -76,7 +78,8 @@ struct pmap;
register_t pc_booke_tlbsave[BOOKE_TLBSAVE_LEN]; \
register_t pc_booke_tlb_level; \
uint32_t *pc_booke_tlb_lock; \
int pc_tid_next;
int pc_tid_next; \
char __pad[173]
/* Definitions for register offsets within the exception tmp save areas */
#define CPUSAVE_R27 0 /* where r27 gets saved */

3
sys/sparc64/include/pcpu.h
View File

@ -60,7 +60,8 @@ struct pmap;
u_int pc_node; \
u_int pc_tlb_ctx; \
u_int pc_tlb_ctx_max; \
u_int pc_tlb_ctx_min
u_int pc_tlb_ctx_min; \
char __pad[405]
#ifdef _KERNEL

16
sys/sys/pcpu.h
View File

@ -180,6 +180,14 @@ struct pcpu {
PCPU_MD_FIELDS;
} __aligned(CACHE_LINE_SIZE);
#ifdef CTASSERT
/*
* To minimize memory waste in per-cpu UMA zones, size of struct pcpu
* should be denominator of PAGE_SIZE.
*/
CTASSERT((PAGE_SIZE / sizeof(struct pcpu)) * sizeof(struct pcpu) == PAGE_SIZE);
#endif
#ifdef _KERNEL
STAILQ_HEAD(cpuhead, pcpu);
@ -194,6 +202,14 @@ extern struct pcpu *cpuid_to_pcpu[];
#endif
#define curvidata PCPU_GET(vidata)
/* Accessor to elements allocated via UMA_ZONE_PCPU zone. */
static inline void *
zpcpu_get(void *base)
{
return ((char *)(base) + sizeof(struct pcpu) * curcpu);
}
/*
* Machine dependent callouts. cpu_pcpu_init() is responsible for
* initializing machine dependent fields of struct pcpu, and