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util: Add virHostCPUGetHaltPollTime
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>
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@ -2376,6 +2376,7 @@ virHookPresent;
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# util/virhostcpu.h
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# util/virhostcpu.h
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virHostCPUGetAvailableCPUsBitmap;
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virHostCPUGetAvailableCPUsBitmap;
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virHostCPUGetCount;
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virHostCPUGetCount;
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virHostCPUGetHaltPollTime;
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virHostCPUGetInfo;
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virHostCPUGetInfo;
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virHostCPUGetKVMMaxVCPUs;
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virHostCPUGetKVMMaxVCPUs;
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virHostCPUGetMap;
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virHostCPUGetMap;
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@ -1535,3 +1535,42 @@ virHostCPUGetSignature(char **signature)
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}
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}
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#endif /* __linux__ */
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#endif /* __linux__ */
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int
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virHostCPUGetHaltPollTime(pid_t pid,
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unsigned long long *haltPollSuccess,
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unsigned long long *haltPollFail)
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{
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g_autofree char *pidToStr = NULL;
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g_autofree char *debugFsPath = NULL;
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g_autofree char *kvmPath = NULL;
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struct dirent *ent = NULL;
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g_autoptr(DIR) dir = NULL;
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bool found = false;
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if (!(debugFsPath = virFileFindMountPoint("debugfs")))
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return -1;
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kvmPath = g_strdup_printf("%s/%s", debugFsPath, "kvm");
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if (virDirOpenQuiet(&dir, kvmPath) != 1)
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return -1;
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pidToStr = g_strdup_printf("%lld-", (long long)pid);
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while (virDirRead(dir, &ent, NULL) > 0) {
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if (STRPREFIX(ent->d_name, pidToStr)) {
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found = true;
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break;
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}
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}
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if (!found)
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return -1;
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if (virFileReadValueUllongQuiet(haltPollSuccess, "%s/%s/%s", kvmPath,
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ent->d_name, "halt_poll_success_ns") < 0 ||
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virFileReadValueUllongQuiet(haltPollFail, "%s/%s/%s", kvmPath,
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ent->d_name, "halt_poll_fail_ns") < 0)
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return -1;
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return 0;
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}
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@ -83,3 +83,7 @@ int virHostCPUGetMSR(unsigned long index,
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virHostCPUTscInfo *virHostCPUGetTscInfo(void);
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virHostCPUTscInfo *virHostCPUGetTscInfo(void);
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int virHostCPUGetSignature(char **signature);
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int virHostCPUGetSignature(char **signature);
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int virHostCPUGetHaltPollTime(pid_t pid,
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unsigned long long *haltPollSuccess,
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unsigned long long *haltPollFail);
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