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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-MIME-Autoconverted: from quoted-printable to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 16GAghbC009128 X-loop: libvir-list@redhat.com Cc: yubihong@huawei.com, pkrempa@redhat.com, mprivozn@redhat.com, yangfei85@huawei.com, xiexiangyou@huawei.com, liangpeng10@huawei.com X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=libvir-list-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1626432179169100001 Content-Type: text/plain; charset="utf-8" Add helper function virGetCpuHaltPollTime 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 --- src/libvirt_private.syms | 1 + src/util/virutil.c | 43 ++++++++++++++++++++++++++++++++++++++++ src/util/virutil.h | 4 ++++ 3 files changed, 48 insertions(+) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 68e4b6aab8..64aff4eca4 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -3479,6 +3479,7 @@ virDoesUserExist; virDoubleToStr; virFormatIntDecimal; virFormatIntPretty; +virGetCpuHaltPollTime; virGetDeviceID; virGetDeviceUnprivSGIO; virGetGroupID; diff --git a/src/util/virutil.c b/src/util/virutil.c index 311cbbf93a..f5304644c0 100644 --- a/src/util/virutil.c +++ b/src/util/virutil.c @@ -1936,3 +1936,46 @@ virPipeNonBlock(int fds[2]) { return virPipeImpl(fds, true, true); } + +int +virGetCpuHaltPollTime(pid_t pid, + unsigned long long *haltPollSuccess, + unsigned long long *haltPollFail) +{ + g_autofree char *pidToStr =3D NULL; + g_autofree char *debugFsPath =3D NULL; + g_autofree char *completePath =3D NULL; + struct dirent *ent =3D NULL; + g_autoptr(DIR) dir =3D NULL; + int ret =3D -1; + bool found =3D false; + + if (!(debugFsPath =3D virFileFindMountPoint("debugfs"))) + return ret; + + completePath =3D g_strdup_printf("%s/%s", debugFsPath, "kvm"); + if (virDirOpenIfExists(&dir, completePath) !=3D 1) + return ret; + + pidToStr =3D g_strdup_printf("%d%c", pid, '-'); + while (virDirRead(dir, &ent, NULL) > 0) { + if (STRPREFIX(ent->d_name, pidToStr)) { + found =3D true; + break; + } + } + + if (!found) + return ret; + + if (virFileReadValueUllong(haltPollSuccess, "%s/%s/%s", completePath, + ent->d_name, "halt_poll_success_ns") < 0 + || virFileReadValueUllong(haltPollFail, "%s/%s/%s", completePath, + ent->d_name, "halt_poll_fail_ns") < 0) { + return ret; + } + + ret =3D 0; + + return ret; +} diff --git a/src/util/virutil.h b/src/util/virutil.h index 854b494890..03b225185f 100644 --- a/src/util/virutil.h +++ b/src/util/virutil.h @@ -225,3 +225,7 @@ int virPipeQuiet(int fds[2]); * Returns: -1 on error, 0 on success */ int virPipeNonBlock(int fds[2]); + +int virGetCpuHaltPollTime(pid_t pid, + unsigned long long *haltPollSuccess, + unsigned long long *haltPollFail); --=20 2.23.0