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| author | Gleb Smirnoff <glebius@FreeBSD.org> | 2013-04-08 19:19:10 +0000 |
|---|---|---|
| committer | Gleb Smirnoff <glebius@FreeBSD.org> | 2013-04-08 19:19:10 +0000 |
| commit | 17dece86fefee7a36604c5ebc9b7dd7f96bc6ebf (patch) | |
| tree | 417e1a1bd53ca195c061caab891a3d8d940beb2b /sys/sys | |
| parent | ad97af7ebdd3833d5b5803324c3c460606a0c626 (diff) | |
| download | src-17dece86fefee7a36604c5ebc9b7dd7f96bc6ebf.tar.gz src-17dece86fefee7a36604c5ebc9b7dd7f96bc6ebf.zip | |
Merge from projects/counters:
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.
Notes
Notes:
svn path=/head/; revision=249265
Diffstat (limited to 'sys/sys')
| -rw-r--r-- | sys/sys/pcpu.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/sys/sys/pcpu.h b/sys/sys/pcpu.h index e86038565755..c73cc5364a62 100644 --- a/sys/sys/pcpu.h +++ b/sys/sys/pcpu.h @@ -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 |