8:10 a.m.
[Using `pahole' and friends - see
http://git.kernel.org/?p=linux/kernel/git/acme/pahole.git;a=summary and
https://ols2006.108.redhat.com/2007/Reprints/melo-Reprint.pdf ]
These are all on x86-64. You'll get slightly different results on a 32
bit arch.
Largest structures, by size:
qemud_vm_def: 16608 4
qemud_vm_os_def: 16436 1
_testConn: 14504 2
qemud_vm: 12368 2
qemud_network: 8240 0
qemud_vm_disk_def: 4376 2
qemud_driver: 4192 1
qemud_vm_net_def: 4136 2
xenXMConfCache: 4112 0
_virProxyFullPacket: 4096 0
_xmlParserCtxt: 696 5
_virDriver: 432 1
utsname: 390 0
_testDom: 360 0
_xmlXPathContext: 352 4
xenUnifiedDriver: 328 0
dirent: 280 0
_xmlSAXHandler: 256 1
_IO_FILE: 216 2
_xenUnifiedPrivate: 192 1
qemud_network_def: 192 2
_xmlDoc: 168 2
_virConnect: 168 0
_testNet: 156 0
Structures with holes which could be made smaller by packaging (third
number is how many bytes you'd save per allocation):
qemud_vm 12368 12360 8
qemud_vm_def 16608 16600 8
private_data 56 48 8
remote_domain_get_info_ret 40 32 8
XDR 48 40 8
xen_v0_vcpuinfo 40 32 8
_xmlValidCtxt 112 104 8
_xmlEntity 136 128 8
_xmlParserCtxt 696 672 24
_testConn 14504 14496 8
_xmlURI 80 72 8
_xmlXPathObject 72 56 16
_xmlXPathParserContext 80 72 8
_xmlXPathContext 352 336 16
_xmlError 88 80 8
_xmlAttr 96 88 8
_xmlDoc 168 160 8
_xmlNode 120 112 8
_IO_FILE 216 208 8
_virDomainInfo 40 32 8
Longest functions (NB: long functions are not a bad thing -- read Steve
McConnell).
qemudParseVMDef: 9680
doRemoteOpen: 6631
xenXMParseXMLToConfig: 5678
xenXMDomainFormatXML: 5678
xend_parse_sexp_desc: 5424
qemudBuildCommandLine: 5204
virDomainParseXMLDesc: 3503
qemudGenerateXML: 2556
__virErrorMsg: 2332
testOpenFromFile: 2210
call: 2206
qemudStartNetworkDaemon: 2105
virDomainParseXMLOSDescHVM: 2078
qemudParseNetworkDef: 2023
xenHypervisorMakeCapabilitiesXML: 1838
virDomainParseXMLDiskDesc: 1686
qemudStartVMDaemon: 1683
xenXMConfigCacheRefresh: 1547
xenXMParseXMLDisk: 1545
virConfParseValue: 1516
virConfParse: 1457
qemudScanConfigDir: 1396
testLoadNetwork: 1353
dhcpStartDhcpDaemon: 1259
virXen_getvcpusinfo: 1257
testLoadDomain: 1244
qemudDomainSave: 1194
virDomainParseXMLIfDesc: 1164
xenHypervisorInit: 1104
xenXMDomainDefineXML: 1083
iptablesAddRemoveRule: 1081
testOpen: 1075
Functions with the most variables (perhaps a better indicator of
"complexity", I know that doRemoteOpen is a bloody complicated function
for example):
xenXMDomainFormatXML: 18
virDomainParseXMLDesc: 18
doRemoteOpen: 18
testLoadDomain: 17
xenHypervisorMakeCapabilitiesXML: 16
testLoadNetwork: 15
xenXMParseXMLDisk: 14
xenStoreLookupByName: 13
xend_parse_sexp_desc: 13
virDomainParseXMLDiskDesc: 13
testOpenFromFile: 12
qemudBuildCommandLine: 12
xenStoreDomainGetNetworkID: 10
xenDaemonDomainGetVcpus: 10
virDomainParseXMLOSDescHVM: 10
qemudParseInterfaceXML: 10
xenXMParseXMLVif: 9
xenXMParseXMLToConfig: 9
xenXMDomainDefineXML: 9
query_parse: 9
iptablesAddRemoveRule: 9
xenStoreListDomains: 8
xenHypervisorLookupDomainByUUID: 8
xenHypervisorInit: 8
xenDaemonListDomainsOld: 8
virDomainParseXMLOSDescPV: 8
virDomainParseXMLIfDesc: 8
testNetworkDumpXML: 8
testDomainDumpXML: 8
qemudNetworkIfaceConnect: 8
qemudGenerateXML: 8
qemudDomainSave: 8
Functions with more than one "goto" label:
qemudAddIptablesRules: 10
doRemoteOpen: 4
xenDaemonOpen: 3
qemudStartNetworkDaemon: 3
qemudExtractVersionInfo: 3
xenXMDomainFormatXML: 2
xenHypervisorInit: 2
xend_parse_sexp_desc: 2
virParseXMLDevice: 2
__virGetNetwork: 2
__virGetDomain: 2
virDomainXMLDevID: 2
remoteForkDaemon: 2
query_parse: 2
qemudStartup: 2
qemudNetworkIfaceConnect: 2
qemudGenerateXML: 2
qemudBuildCommandLine: 2
negotiate_gnutls_on_connection: 2
Functions with the most parameters (in C these are dangerous because of
C's lousy typechecking):
__virRaiseError: 12
xenXMConfigSetIntFromXPath: 8
xenUnifiedDomainMigratePrepare: 8
xenDaemonDomainMigratePrepare: 8
__virDomainMigratePrepare: 8
remoteDomainMigratePrepare: 8
qemudReadMonitorOutput: 8
call: 8
xenXMConfigSetStringFromXPath: 7
xenUnifiedDomainMigratePerform: 7
xenDaemonDomainMigratePerform: 7
_virExec: 7
__virDomainMigratePerform: 7
remoteDomainMigratePerform: 7
xenUnifiedDomainMigrateFinish: 6
xend_op_ext2: 6
virXen_getvcpusinfo: 6
virExecNonBlock: 6
virExec: 6
virDomainParseXMLOSDescHVM: 6
__virDomainMigrateFinish: 6
virDomainMigrate: 6
remoteDomainMigrateFinish: 6
All global variables (nothing wrong with global variables, I say):
extern unsigned int __invalid_size_argument_for_IOC; /* 0 */
struct qemu_feature_flags arch_info_i686_flags[4]; /* 0 */
struct qemu_feature_flags arch_info_x86_64_flags[3]; /* 0 */
struct qemud_driver * qemu_driver; /* 0 */
struct qemu_arch_info qemudArchs[7]; /* 1 */
extern struct _IO_FILE * stderr; /* 9 */
extern struct _IO_FILE * stdin; /* 23 */
extern struct _IO_FILE * stdout; /* 23 */
enum /**/ virDrvOpenRemoteFlags; /* 0 */
struct xenUnifiedDriver xenDaemonDriver; /* 1 */
struct xenUnifiedDriver xenHypervisorDriver; /* 1 */
struct xenUnifiedDriver xenProxyDriver; /* 1 */
struct xenUnifiedDriver xenStoreDriver; /* 1 */
struct xenUnifiedDriver xenXMDriver; /* 1 */
extern xmlFreeFunc xmlFree; /* 3 */
extern xmlMallocFunc xmlMalloc; /* 0 */
Rich.
--
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