libvirt/src/vz/vz_utils.h

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/*
* vz_utils.h: core driver functions for managing
* Parallels Cloud Server hosts
*
* Copyright (C) 2012 Parallels, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#ifndef PARALLELS_UTILS_H
# define PARALLELS_UTILS_H
# include <Parallels.h>
# include "driver.h"
# include "conf/domain_conf.h"
# include "conf/domain_event.h"
# include "virthread.h"
# define vzParseError() \
virReportErrorHelper(VIR_FROM_TEST, VIR_ERR_OPERATION_FAILED, __FILE__, \
__FUNCTION__, __LINE__, _("Can't parse prlctl output"))
# define IS_CT(def) (def->os.type == VIR_DOMAIN_OSTYPE_EXE)
# define vzDomNotFoundError(domain) \
do { \
char uuidstr[VIR_UUID_STRING_BUFLEN]; \
virUUIDFormat(domain->uuid, uuidstr); \
virReportError(VIR_ERR_NO_DOMAIN, \
_("no domain with matching uuid '%s'"), uuidstr); \
} while (0)
# define PARALLELS_DOMAIN_ROUTED_NETWORK_NAME "Routed"
# define PARALLELS_DOMAIN_BRIDGED_NETWORK_NAME "Bridged"
struct _vzConn {
virMutex lock;
/* Immutable pointer, self-locking APIs */
virDomainObjListPtr domains;
PRL_HANDLE server;
virCapsPtr caps;
virDomainXMLOptionPtr xmlopt;
virObjectEventStatePtr domainEventState;
const char *drivername;
};
typedef struct _vzConn vzConn;
typedef struct _vzConn *vzConnPtr;
struct _vzCountersCache {
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
PRL_HANDLE stats;
virCond cond;
/* = -1 - unsubscribed
> -1 - subscribed */
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
int count;
};
typedef struct _vzCountersCache vzCountersCache;
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
struct vzDomObj {
int id;
char *uuid;
char *home;
PRL_HANDLE sdkdom;
vzCountersCache cache;
};
typedef struct vzDomObj *vzDomObjPtr;
virDomainObjPtr vzDomObjFromDomain(virDomainPtr domain);
virDomainObjPtr vzDomObjFromDomainRef(virDomainPtr domain);
char * vzGetOutput(const char *binary, ...)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_SENTINEL;
void vzDriverLock(vzConnPtr driver);
void vzDriverUnlock(vzConnPtr driver);
# define PARALLELS_BLOCK_STATS_FOREACH(OP) \
OP(rd_req, VIR_DOMAIN_BLOCK_STATS_READ_REQ, "read_requests") \
OP(rd_bytes, VIR_DOMAIN_BLOCK_STATS_READ_BYTES, "read_total") \
OP(wr_req, VIR_DOMAIN_BLOCK_STATS_WRITE_REQ, "write_requests") \
OP(wr_bytes, VIR_DOMAIN_BLOCK_STATS_WRITE_BYTES, "write_total")
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
#endif