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util: Add virHostCPUGetHaltPollTime

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Add helper function virHostCPUGetHaltPollTime to obtain halt polling
time. If the kernel support halt polling time statistic, and mount
debugfs. This function will take effect on KVM VMs.

Signed-off-by: Yang Fei <yangfei85@huawei.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Yang Fei 2021-07-22 16:05:01 +08:00 committed by Michal Privoznik
parent b8674109ee
commit a90b1f24cf
3 changed files with 44 additions and 0 deletions
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1
src/libvirt_private.syms
View File

@ -2376,6 +2376,7 @@ virHookPresent;
# util/virhostcpu.h
virHostCPUGetAvailableCPUsBitmap;
virHostCPUGetCount;
virHostCPUGetHaltPollTime;
virHostCPUGetInfo;
virHostCPUGetKVMMaxVCPUs;
virHostCPUGetMap;

39
src/util/virhostcpu.c
View File

@ -1535,3 +1535,42 @@ virHostCPUGetSignature(char **signature)
}
#endif /* __linux__ */
int
virHostCPUGetHaltPollTime(pid_t pid,
unsigned long long *haltPollSuccess,
unsigned long long *haltPollFail)
{
g_autofree char *pidToStr = NULL;
g_autofree char *debugFsPath = NULL;
g_autofree char *kvmPath = NULL;
struct dirent *ent = NULL;
g_autoptr(DIR) dir = NULL;
bool found = false;
if (!(debugFsPath = virFileFindMountPoint("debugfs")))
return -1;
kvmPath = g_strdup_printf("%s/%s", debugFsPath, "kvm");
if (virDirOpenQuiet(&dir, kvmPath) != 1)
return -1;
pidToStr = g_strdup_printf("%lld-", (long long)pid);
while (virDirRead(dir, &ent, NULL) > 0) {
if (STRPREFIX(ent->d_name, pidToStr)) {
found = true;
break;
}
}
if (!found)
return -1;
if (virFileReadValueUllongQuiet(haltPollSuccess, "%s/%s/%s", kvmPath,
ent->d_name, "halt_poll_success_ns") < 0 ||
virFileReadValueUllongQuiet(haltPollFail, "%s/%s/%s", kvmPath,
ent->d_name, "halt_poll_fail_ns") < 0)
return -1;
return 0;
}

4
src/util/virhostcpu.h
View File

@ -83,3 +83,7 @@ int virHostCPUGetMSR(unsigned long index,
virHostCPUTscInfo *virHostCPUGetTscInfo(void);
int virHostCPUGetSignature(char **signature);
int virHostCPUGetHaltPollTime(pid_t pid,
unsigned long long *haltPollSuccess,
unsigned long long *haltPollFail);