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bh=d6c9Dh6DpJEE7vEzrUk2dji3IV6ZaqsRoo9BP1lAldQ=; b=X0xR77XvHbUP3YlKCHPMeizR/vsdVhyCvuz5qifyICVa2S/LxAbK9S5EBweztzafsIwsNL U74XEK8LpAaKakFvAf4CZ68Zzbw1VVTMROF6ImWO+oa841XTT78g0SI4t/oIdda8UPs/yw 7/i0pSkaDeAkupKqh8GSHsh5mCQ3MzI= X-MC-Unique: 9Tuc5BycMvyNk_hQ3Rmf7w-1 From: Konstantin Kostiuk To: qemu-devel@nongnu.org, Peter Maydell , Richard Henderson Subject: [PULL 3/3] qga: add command 'guest-get-cpustats' Date: Wed, 13 Jul 2022 13:19:08 +0300 Message-Id: <20220713101908.2212307-4-kkostiuk@redhat.com> In-Reply-To: <20220713101908.2212307-1-kkostiuk@redhat.com> References: <20220713101908.2212307-1-kkostiuk@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=kkostiuk@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1657708144071100001 From: zhenwei pi A vCPU thread always reaches 100% utilization when: - guest uses idle=3Dpoll - disable HLT vm-exit - enable MWAIT Add new guest agent command 'guest-get-cpustats' to get guest CPU statistics, we can know the guest workload and how busy the CPU is. Reviewed-by: Marc-Andr=C3=A9 Lureau Signed-off-by: zhenwei pi Message-Id: <20220707005602.696557-3-pizhenwei@bytedance.com> Reviewed-by: Konstantin Kostiuk Signed-off-by: Konstantin Kostiuk --- qga/commands-posix.c | 89 ++++++++++++++++++++++++++++++++++++++++++++ qga/commands-win32.c | 6 +++ qga/qapi-schema.json | 81 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 176 insertions(+) diff --git a/qga/commands-posix.c b/qga/commands-posix.c index 0469dc409d..f18530d85f 100644 --- a/qga/commands-posix.c +++ b/qga/commands-posix.c @@ -2893,6 +2893,90 @@ GuestDiskStatsInfoList *qmp_guest_get_diskstats(Erro= r **errp) return guest_get_diskstats(errp); } =20 +GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp) +{ + GuestCpuStatsList *head =3D NULL, **tail =3D &head; + const char *cpustats =3D "/proc/stat"; + int clk_tck =3D sysconf(_SC_CLK_TCK); + FILE *fp; + size_t n; + char *line =3D NULL; + + fp =3D fopen(cpustats, "r"); + if (fp =3D=3D NULL) { + error_setg_errno(errp, errno, "open(\"%s\")", cpustats); + return NULL; + } + + while (getline(&line, &n, fp) !=3D -1) { + GuestCpuStats *cpustat =3D NULL; + GuestLinuxCpuStats *linuxcpustat; + int i; + unsigned long user, system, idle, iowait, irq, softirq, steal, gue= st; + unsigned long nice, guest_nice; + char name[64]; + + i =3D sscanf(line, "%s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu", + name, &user, &nice, &system, &idle, &iowait, &irq, &sof= tirq, + &steal, &guest, &guest_nice); + + /* drop "cpu 1 2 3 ...", get "cpuX 1 2 3 ..." only */ + if ((i =3D=3D EOF) || strncmp(name, "cpu", 3) || (name[3] =3D=3D '= \0')) { + continue; + } + + if (i < 5) { + slog("Parsing cpu stat from %s failed, see \"man proc\"", cpus= tats); + break; + } + + cpustat =3D g_new0(GuestCpuStats, 1); + cpustat->type =3D GUEST_CPU_STATS_TYPE_LINUX; + + linuxcpustat =3D &cpustat->u.q_linux; + linuxcpustat->cpu =3D atoi(&name[3]); + linuxcpustat->user =3D user * 1000 / clk_tck; + linuxcpustat->nice =3D nice * 1000 / clk_tck; + linuxcpustat->system =3D system * 1000 / clk_tck; + linuxcpustat->idle =3D idle * 1000 / clk_tck; + + if (i > 5) { + linuxcpustat->has_iowait =3D true; + linuxcpustat->iowait =3D iowait * 1000 / clk_tck; + } + + if (i > 6) { + linuxcpustat->has_irq =3D true; + linuxcpustat->irq =3D irq * 1000 / clk_tck; + linuxcpustat->has_softirq =3D true; + linuxcpustat->softirq =3D softirq * 1000 / clk_tck; + } + + if (i > 8) { + linuxcpustat->has_steal =3D true; + linuxcpustat->steal =3D steal * 1000 / clk_tck; + } + + if (i > 9) { + linuxcpustat->has_guest =3D true; + linuxcpustat->guest =3D guest * 1000 / clk_tck; + } + + if (i > 10) { + linuxcpustat->has_guest =3D true; + linuxcpustat->guest =3D guest * 1000 / clk_tck; + linuxcpustat->has_guestnice =3D true; + linuxcpustat->guestnice =3D guest_nice * 1000 / clk_tck; + } + + QAPI_LIST_APPEND(tail, cpustat); + } + + free(line); + fclose(fp); + return head; +} + #else /* defined(__linux__) */ =20 void qmp_guest_suspend_disk(Error **errp) @@ -3247,6 +3331,11 @@ GuestDiskStatsInfoList *qmp_guest_get_diskstats(Erro= r **errp) return NULL; } =20 +GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp) +{ + error_setg(errp, QERR_UNSUPPORTED); + return NULL; +} =20 #endif /* CONFIG_FSFREEZE */ =20 diff --git a/qga/commands-win32.c b/qga/commands-win32.c index 36f94c0f9c..7ed7664715 100644 --- a/qga/commands-win32.c +++ b/qga/commands-win32.c @@ -2543,3 +2543,9 @@ GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error= **errp) error_setg(errp, QERR_UNSUPPORTED); return NULL; } + +GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp) +{ + error_setg(errp, QERR_UNSUPPORTED); + return NULL; +} diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json index 9fa20e791b..869399ea1a 100644 --- a/qga/qapi-schema.json +++ b/qga/qapi-schema.json @@ -1576,3 +1576,84 @@ { 'command': 'guest-get-diskstats', 'returns': ['GuestDiskStatsInfo'] } + +## +# @GuestCpuStatsType: +# +# An enumeration of OS type +# +# Since: 7.1 +## +{ 'enum': 'GuestCpuStatsType', + 'data': [ 'linux' ] } + + +## +# @GuestLinuxCpuStats: +# +# CPU statistics of Linux +# +# @cpu: CPU index in guest OS +# +# @user: Time spent in user mode +# +# @nice: Time spent in user mode with low priority (nice) +# +# @system: Time spent in system mode +# +# @idle: Time spent in the idle task +# +# @iowait: Time waiting for I/O to complete (since Linux 2.5.41) +# +# @irq: Time servicing interrupts (since Linux 2.6.0-test4) +# +# @softirq: Time servicing softirqs (since Linux 2.6.0-test4) +# +# @steal: Stolen time by host (since Linux 2.6.11) +# +# @guest: ime spent running a virtual CPU for guest operating systems under +# the control of the Linux kernel (since Linux 2.6.24) +# +# @guestnice: Time spent running a niced guest (since Linux 2.6.33) +# +# Since: 7.1 +## +{ 'struct': 'GuestLinuxCpuStats', + 'data': {'cpu': 'int', + 'user': 'uint64', + 'nice': 'uint64', + 'system': 'uint64', + 'idle': 'uint64', + '*iowait': 'uint64', + '*irq': 'uint64', + '*softirq': 'uint64', + '*steal': 'uint64', + '*guest': 'uint64', + '*guestnice': 'uint64' + } } + +## +# @GuestCpuStats: +# +# Get statistics of each CPU in millisecond. +# +# - @linux: Linux style CPU statistics +# +# Since: 7.1 +## +{ 'union': 'GuestCpuStats', + 'base': { 'type': 'GuestCpuStatsType' }, + 'discriminator': 'type', + 'data': { 'linux': 'GuestLinuxCpuStats' } } + +## +# @guest-get-cpustats: +# +# Retrieve information about CPU stats. +# Returns: List of CPU stats of guest. +# +# Since: 7.1 +## +{ 'command': 'guest-get-cpustats', + 'returns': ['GuestCpuStats'] +} --=20 2.25.1