Re: [libvirt] [PATCH v3 1/9] Implement public API for virDomainGetIOThreadsInfo

Add virDomainGetIOThreadsInfo in order to return a list of virDomainIOThreadsInfoPtr structures which list the IOThread ID, the CPU Affinity map, and associated resources for each IOThread for the domain. For an active domain, the live data will be returned, while for an inactive domain, the config data will be returned. The resources data is expected to be the src path for the disks that have an assigned iothread. The API supports either the --live or --config flag, but not both. Also added virDomainIOThreadsInfoFree in order to free the cpumap, list of resources, and the array entry structure. Signed-off-by: John Ferlan <jferlan(a)redhat.com&gt; --- include/libvirt/libvirt-domain.h | 23 +++++++++++- src/driver-hypervisor.h | 8 +++- src/libvirt-domain.c | 80 +++++++++++++++++++++++++++++++++++++++- src/libvirt_public.syms | 6 +++ 4 files changed, 114 insertions(+), 3 deletions(-) diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h index 4dbd7f5..9dcc424 100644 --- a/include/libvirt/libvirt-domain.h +++ b/include/libvirt/libvirt-domain.h @@ -4,7 +4,7 @@ * Description: Provides APIs for the management of domains * Author: Daniel Veillard <veillard(a)redhat.com&gt; * - * Copyright (C) 2006-2014 Red Hat, Inc. + * Copyright (C) 2006-2015 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -1568,6 +1568,27 @@ int virDomainGetEmulatorPinInfo (virDomainPtr domain, unsigned int flags); /** + * virIOThreadsInfo: + * + * The data structure for information about IOThreads in a domain + */ +typedef struct _virDomainIOThreadsInfo virDomainIOThreadsInfo; +typedef virDomainIOThreadsInfo *virDomainIOThreadsInfoPtr; +struct _virDomainIOThreadsInfo { + unsigned int iothread_id; /* IOThread ID */ + unsigned char *cpumap; /* CPU map for thread */ + int cpumaplen; /* cpumap size */ + size_t nresources; /* count of resources using IOThread */ + char **resources; /* array of resources using IOThread */ +};

+ +void virDomainIOThreadsInfoFree(virDomainIOThreadsInfoPtr info); + +int virDomainGetIOThreadsInfo(virDomainPtr domain, + virDomainIOThreadsInfoPtr **info, + unsigned int flags); + +/** * VIR_USE_CPU: * @cpumap: pointer to a bit map of real CPUs (in 8-bit bytes) (IN/OUT) * @cpu: the physical CPU number diff --git a/src/driver-hypervisor.h b/src/driver-hypervisor.h index a1198ad..2ce1a51 100644 --- a/src/driver-hypervisor.h +++ b/src/driver-hypervisor.h @@ -1,7 +1,7 @@ /* * driver-hypervisor.h: entry points for hypervisor drivers * - * Copyright (C) 2006-2014 Red Hat, Inc. + * Copyright (C) 2006-2015 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -381,6 +381,11 @@ typedef int (*virDrvDomainGetMaxVcpus)(virDomainPtr domain); typedef int +(*virDrvDomainGetIOThreadsInfo)(virDomainPtr domain, + virDomainIOThreadsInfoPtr **info, + unsigned int flags); + +typedef int (*virDrvDomainGetSecurityLabel)(virDomainPtr domain, virSecurityLabelPtr seclabel); @@ -1254,6 +1259,7 @@ struct _virHypervisorDriver { virDrvDomainGetEmulatorPinInfo domainGetEmulatorPinInfo; virDrvDomainGetVcpus domainGetVcpus; virDrvDomainGetMaxVcpus domainGetMaxVcpus; + virDrvDomainGetIOThreadsInfo domainGetIOThreadsInfo; virDrvDomainGetSecurityLabel domainGetSecurityLabel; virDrvDomainGetSecurityLabelList domainGetSecurityLabelList; virDrvNodeGetSecurityModel nodeGetSecurityModel; diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c index 492e90a..f893b35 100644 --- a/src/libvirt-domain.c +++ b/src/libvirt-domain.c @@ -1,7 +1,7 @@ /* * libvirt-domain.c: entry points for virDomainPtr APIs * - * Copyright (C) 2006-2014 Red Hat, Inc. + * Copyright (C) 2006-2015 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -7891,6 +7891,84 @@ virDomainGetMaxVcpus(virDomainPtr domain) /** + * virDomainGetIOThreadsInfo: + * @dom: a domain object + * @info: pointer to an array of virDomainIOThreadsInfo structures (OUT) + * @flags: bitwise-OR of virDomainModificationImpact + * Must not be VIR_DOMAIN_AFFECT_LIVE and + * VIR_DOMAIN_AFFECT_CONFIG concurrently. + * + * Fetch IOThreads of an active domain including the cpumap information to + * determine on which CPU the IOThread has affinity to run. + * + * Returns the number of IOThreads or -1 in case of error. + * On success, the array of information is stored into @info. The caller is + * responsible for calling virDomainIOThreadsInfoFree() on each array element, + * then calling free() on @info. On error, @info is set to NULL. + */ +int +virDomainGetIOThreadsInfo(virDomainPtr dom, + virDomainIOThreadsInfoPtr **info, + unsigned int flags) +{ + VIR_DOMAIN_DEBUG(dom, "info=%p flags=%x", info, flags); + + virResetLastError(); + + virCheckDomainReturn(dom, -1); + virCheckReadOnlyGoto(dom->conn->flags, error); + virCheckNonNullArgGoto(info, error); + *info = NULL; + + /* At most one of these two flags should be set. */ + if ((flags & VIR_DOMAIN_AFFECT_LIVE) && + (flags & VIR_DOMAIN_AFFECT_CONFIG)) { + virReportInvalidArg(flags, + _("flags 'affect live' and 'affect config' in %s " + "are mutually exclusive"), + __FUNCTION__); + goto error; + } + + if (dom->conn->driver->domainGetIOThreadsInfo) { + int ret; + ret = dom->conn->driver->domainGetIOThreadsInfo(dom, info, flags); + if (ret < 0) + goto error; + return ret; + } + + virReportUnsupportedError(); + + error: + virDispatchError(dom->conn); + return -1; +} + + +/** + * virDomainIOThreadsInfoFree: + * @info: pointer to a virDomainIOThreadsInfo object + * + * Frees the memory used by @info. + */ +void +virDomainIOThreadsInfoFree(virDomainIOThreadsInfoPtr info) +{ + size_t i; + + if (!info) + return; + + VIR_FREE(info->cpumap); + for (i = 0; i < info->nresources; i++) + VIR_FREE(info->resources[i]); + VIR_FREE(info->resources); + VIR_FREE(info); +} + + +/** * virDomainGetSecurityLabel: * @domain: a domain object * @seclabel: pointer to a virSecurityLabel structure diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms index 4ea5cff..d3ddd24 100644 --- a/src/libvirt_public.syms +++ b/src/libvirt_public.syms @@ -695,4 +695,10 @@ LIBVIRT_1.2.12 { virDomainDefineXMLFlags; } LIBVIRT_1.2.11; +LIBVIRT_1.2.13 {

+ global: + virDomainIOThreadsInfoFree; + virDomainGetIOThreadsInfo; +} LIBVIRT_1.2.12; + # .... define new API here using predicted next version number ....