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author | jeff <jeff@FreeBSD.org> | 2009-06-23 22:42:39 +0000 |
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committer | jeff <jeff@FreeBSD.org> | 2009-06-23 22:42:39 +0000 |
commit | 5bc3a65e406b90cd9e2a47b79117e453bdb56413 (patch) | |
tree | 5644c551dea0298e335cc77383345323c6eb3662 /sys/i386/xen | |
parent | d8bf8e1e8ad280542b4de90763d6d552c4f27b3a (diff) | |
download | FreeBSD-src-5bc3a65e406b90cd9e2a47b79117e453bdb56413.zip FreeBSD-src-5bc3a65e406b90cd9e2a47b79117e453bdb56413.tar.gz |
Implement a facility for dynamic per-cpu variables.
- Modules and kernel code alike may use DPCPU_DEFINE(),
DPCPU_GET(), DPCPU_SET(), etc. akin to the statically defined
PCPU_*. Requires only one extra instruction more than PCPU_* and is
virtually the same as __thread for builtin and much faster for shared
objects. DPCPU variables can be initialized when defined.
- Modules are supported by relocating the module's per-cpu linker set
over space reserved in the kernel. Modules may fail to load if there
is insufficient space available.
- Track space available for modules with a one-off extent allocator.
Free may block for memory to allocate space for an extent.
Reviewed by: jhb, rwatson, kan, sam, grehan, marius, marcel, stas
Diffstat (limited to 'sys/i386/xen')
-rw-r--r-- | sys/i386/xen/mp_machdep.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/i386/xen/mp_machdep.c b/sys/i386/xen/mp_machdep.c index f16d25f..3aa03ce 100644 --- a/sys/i386/xen/mp_machdep.c +++ b/sys/i386/xen/mp_machdep.c @@ -744,6 +744,7 @@ start_all_aps(void) /* Get per-cpu data */ pc = &__pcpu[bootAP]; pcpu_init(pc, bootAP, sizeof(struct pcpu)); + dpcpu_init((void *)kmem_alloc(kernel_map, DPCPU_SIZE), bootAP); pc->pc_apic_id = cpu_apic_ids[bootAP]; pc->pc_prvspace = pc; pc->pc_curthread = 0; |