[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] waitqueue: increase stack array
# HG changeset patch # User Olaf Hering <olaf@xxxxxxxxx> # Date 1320773665 -3600 # Node ID 455f064fe54eeb57a43aa0c45a56cc4c4847d7a0 # Parent c6f1423918baecb7a11eb7a151b9d5fb00888228 waitqueue: increase stack array In my testing 1500 bytes were not enough, at least 1800 bytes were required. Allocate a whole page for waitqueue_vcpu and use the remainder as stack array. Signed-off-by: Olaf Hering <olaf@xxxxxxxxx> diff -r c6f1423918ba -r 455f064fe54e xen/common/wait.c --- a/xen/common/wait.c +++ b/xen/common/wait.c @@ -33,7 +33,8 @@ struct waitqueue_vcpu { * hypervisor context before sleeping (descheduling), setjmp/longjmp-style. */ void *esp; - char stack[1500]; + unsigned short stack_len; + char stack[0]; #endif }; @@ -41,12 +42,13 @@ int init_waitqueue_vcpu(struct vcpu *v) { struct waitqueue_vcpu *wqv; - wqv = xzalloc(struct waitqueue_vcpu); + wqv = alloc_xenheap_page(); if ( wqv == NULL ) return -ENOMEM; INIT_LIST_HEAD(&wqv->list); wqv->vcpu = v; + wqv->stack_len = PAGE_SIZE - sizeof(*wqv); v->waitqueue_vcpu = wqv; @@ -62,7 +64,7 @@ void destroy_waitqueue_vcpu(struct vcpu return; BUG_ON(!list_empty(&wqv->list)); - xfree(wqv); + free_xenheap_page(wqv); v->waitqueue_vcpu = NULL; } @@ -114,7 +116,7 @@ static void __prepare_to_wait(struct wai : "=S" (wqv->esp) : "c" (cpu_info), "D" (wqv->stack) : "memory" ); - BUG_ON((cpu_info - (char *)wqv->esp) > sizeof(wqv->stack)); + BUG_ON((cpu_info - (char *)wqv->esp) > wqv->stack_len); } static void __finish_wait(struct waitqueue_vcpu *wqv) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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