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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1749737416; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=K25AQ0jG/1dILnpNLBeLaYv9CgmEZeofJrQZApgFM+E=; b=Gl21sfuev6tUgYyY8GJQPqw+tB0/EmI4/H9lY1zE75sQXiWC5CNHYMt8fylER/c5YUJr5v Ky2c8fZNbCAAYCeArGPuNc9lwkRJkhgKZR1yOhqcVal80MUi6mpyjMR4btt9LN+//fRjFa tUmZN9fMtq4F29d7CQqjBbza/oPFQKk= X-MC-Unique: cIcbvmG9MB62adA6z8fObA-1 X-Mimecast-MFC-AGG-ID: cIcbvmG9MB62adA6z8fObA_1749737345 From: Konstantin Kostiuk To: qemu-devel@nongnu.org, Peter Maydell , Stefan Hajnoczi Subject: [PULL 1/2] qga-win: implement a 'guest-get-load' command Date: Thu, 12 Jun 2025 17:08:56 +0300 Message-ID: <20250612140857.47286-2-kkostiuk@redhat.com> In-Reply-To: <20250612140857.47286-1-kkostiuk@redhat.com> References: <20250612140857.47286-1-kkostiuk@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 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=170.10.129.124; envelope-from=kkostiuk@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1749737528460124100 Windows has no native equivalent API, but it would be possible to simulate it as illustrated here (BSD-3-Clause): https://github.com/giampaolo/psutil/pull/1485 Reviewed-by: Daniel P. Berrang=C3=A9 Tested-by: Dehan Meng Reviewed-by: Yan Vugenfirer Signed-off-by: Konstantin Kostiuk --- qga/commands-win32.c | 148 +++++++++++++++++++++++++++++++++++++++++ qga/guest-agent-core.h | 10 +++ qga/main.c | 39 +++++++++++ qga/meson.build | 2 +- qga/qapi-schema.json | 9 ++- 5 files changed, 205 insertions(+), 3 deletions(-) diff --git a/qga/commands-win32.c b/qga/commands-win32.c index d4482538ec..8227480810 100644 --- a/qga/commands-win32.c +++ b/qga/commands-win32.c @@ -27,6 +27,7 @@ #include #include #include +#include =20 #include "guest-agent-core.h" #include "vss-win32.h" @@ -119,6 +120,28 @@ static OpenFlags guest_file_open_modes[] =3D { {"a+b", FILE_GENERIC_APPEND | GENERIC_READ, OPEN_ALWAYS } }; =20 +/* + * We use an exponentially weighted moving average, just like Unix systems= do + * https://en.wikipedia.org/wiki/Load_(computing)#Unix-style_load_calculat= ion + * + * These constants serve as the damping factor and are calculated with + * 1 / exp(sampling interval in seconds / window size in seconds) + * + * This formula comes from linux's include/linux/sched/loadavg.h + * https://github.com/torvalds/linux/blob/345671ea0f9258f410eb057b9ced9cef= bbe5dc78/include/linux/sched/loadavg.h#L20-L23 + */ +#define LOADAVG_FACTOR_1F 0.9200444146293232478931553241 +#define LOADAVG_FACTOR_5F 0.9834714538216174894737477501 +#define LOADAVG_FACTOR_15F 0.9944598480048967508795473394 +/* + * The time interval in seconds between taking load counts, same as Linux + */ +#define LOADAVG_SAMPLING_INTERVAL 5 + +double load_avg_1m; +double load_avg_5m; +double load_avg_15m; + #define debug_error(msg) do { \ char *suffix =3D g_win32_error_message(GetLastError()); \ g_debug("%s: %s", (msg), suffix); \ @@ -2444,3 +2467,128 @@ char *qga_get_host_name(Error **errp) =20 return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL); } + + +static VOID CALLBACK load_avg_callback(PVOID hCounter, BOOLEAN timedOut) +{ + PDH_FMT_COUNTERVALUE displayValue; + double currentLoad; + PDH_STATUS err; + + err =3D PdhGetFormattedCounterValue( + (PDH_HCOUNTER)hCounter, PDH_FMT_DOUBLE, 0, &displayValue); + /* Skip updating the load if we can't get the value successfully */ + if (err !=3D ERROR_SUCCESS) { + slog("PdhGetFormattedCounterValue failed to get load value with 0x= %lx", + err); + return; + } + currentLoad =3D displayValue.doubleValue; + + load_avg_1m =3D load_avg_1m * LOADAVG_FACTOR_1F + currentLoad * \ + (1.0 - LOADAVG_FACTOR_1F); + load_avg_5m =3D load_avg_5m * LOADAVG_FACTOR_5F + currentLoad * \ + (1.0 - LOADAVG_FACTOR_5F); + load_avg_15m =3D load_avg_15m * LOADAVG_FACTOR_15F + currentLoad * \ + (1.0 - LOADAVG_FACTOR_15F); +} + +static BOOL init_load_avg_counter(Error **errp) +{ + CONST WCHAR *szCounterPath =3D L"\\System\\Processor Queue Length"; + PDH_STATUS status; + BOOL ret; + HQUERY hQuery; + HCOUNTER hCounter; + HANDLE event; + HANDLE waitHandle; + + status =3D PdhOpenQueryW(NULL, 0, &hQuery); + if (status !=3D ERROR_SUCCESS) { + /* + * If the function fails, the return value is a system error code = or + * a PDH error code. error_setg_win32 cant translate PDH error code + * properly, so just report it as is. + */ + error_setg_win32(errp, (DWORD)status, + "PdhOpenQueryW failed with 0x%lx", status); + return FALSE; + } + + status =3D PdhAddEnglishCounterW(hQuery, szCounterPath, 0, &hCounter); + if (status !=3D ERROR_SUCCESS) { + error_setg_win32(errp, (DWORD)status, + "PdhAddEnglishCounterW failed with 0x%lx. Performance counters= may be disabled.", + status); + PdhCloseQuery(hQuery); + return FALSE; + } + + event =3D CreateEventW(NULL, FALSE, FALSE, L"LoadUpdateEvent"); + if (event =3D=3D NULL) { + error_setg_win32(errp, GetLastError(), "Create LoadUpdateEvent fai= led"); + PdhCloseQuery(hQuery); + return FALSE; + } + + status =3D PdhCollectQueryDataEx(hQuery, LOADAVG_SAMPLING_INTERVAL, ev= ent); + if (status !=3D ERROR_SUCCESS) { + error_setg_win32(errp, (DWORD)status, + "PdhCollectQueryDataEx failed with 0x%lx", status= ); + CloseHandle(event); + PdhCloseQuery(hQuery); + return FALSE; + } + + ret =3D RegisterWaitForSingleObject( + &waitHandle, + event, + (WAITORTIMERCALLBACK)load_avg_callback, + (PVOID)hCounter, + INFINITE, + WT_EXECUTEDEFAULT); + + if (ret =3D=3D 0) { + error_setg_win32(errp, GetLastError(), + "RegisterWaitForSingleObject failed"); + CloseHandle(event); + PdhCloseQuery(hQuery); + return FALSE; + } + + ga_set_load_avg_wait_handle(ga_state, waitHandle); + ga_set_load_avg_event(ga_state, event); + ga_set_load_avg_pdh_query(ga_state, hQuery); + + return TRUE; +} + +GuestLoadAverage *qmp_guest_get_load(Error **errp) +{ + /* + * The load average logic calls PerformaceCounterAPI, which can result + * in a performance penalty. This avoids running the load average logic + * until a management application actually requests it. The load avera= ge + * will not initially be very accurate, but assuming that any interest= ed + * management application will request it repeatedly throughout the li= fetime + * of the VM, this seems like a good mitigation. + */ + if (ga_get_load_avg_pdh_query(ga_state) =3D=3D NULL) { + /* set initial values */ + load_avg_1m =3D 0; + load_avg_5m =3D 0; + load_avg_15m =3D 0; + + if (init_load_avg_counter(errp) =3D=3D false) { + return NULL; + } + } + + GuestLoadAverage *ret =3D NULL; + + ret =3D g_new0(GuestLoadAverage, 1); + ret->load1m =3D load_avg_1m; + ret->load5m =3D load_avg_5m; + ret->load15m =3D load_avg_15m; + return ret; +} diff --git a/qga/guest-agent-core.h b/qga/guest-agent-core.h index a536d07d0d..d9f3922adf 100644 --- a/qga/guest-agent-core.h +++ b/qga/guest-agent-core.h @@ -13,6 +13,10 @@ #ifndef GUEST_AGENT_CORE_H #define GUEST_AGENT_CORE_H =20 +#ifdef _WIN32 +#include +#endif + #include "qapi/qmp-registry.h" #include "qga-qapi-types.h" =20 @@ -41,6 +45,12 @@ void ga_set_response_delimited(GAState *s); bool ga_is_frozen(GAState *s); void ga_set_frozen(GAState *s); void ga_unset_frozen(GAState *s); +#ifdef _WIN32 +void ga_set_load_avg_event(GAState *s, HANDLE event); +void ga_set_load_avg_wait_handle(GAState *s, HANDLE wait_handle); +void ga_set_load_avg_pdh_query(GAState *s, HQUERY query); +HQUERY ga_get_load_avg_pdh_query(GAState *s); +#endif const char *ga_fsfreeze_hook(GAState *s); int64_t ga_get_fd_handle(GAState *s, Error **errp); int ga_parse_whence(GuestFileWhence *whence, Error **errp); diff --git a/qga/main.c b/qga/main.c index 72c39b042f..6c02f3ec38 100644 --- a/qga/main.c +++ b/qga/main.c @@ -33,6 +33,7 @@ #include "qemu-version.h" #ifdef _WIN32 #include +#include #include "qga/service-win32.h" #include "qga/vss-win32.h" #endif @@ -105,6 +106,9 @@ struct GAState { GAService service; HANDLE wakeup_event; HANDLE event_log; + HANDLE load_avg_wait_handle; + HANDLE load_avg_event; + HQUERY load_avg_pdh_query; #endif bool delimit_response; bool frozen; @@ -582,6 +586,25 @@ const char *ga_fsfreeze_hook(GAState *s) } #endif =20 +#ifdef _WIN32 +void ga_set_load_avg_wait_handle(GAState *s, HANDLE wait_handle) +{ + s->load_avg_wait_handle =3D wait_handle; +} +void ga_set_load_avg_event(GAState *s, HANDLE event) +{ + s->load_avg_event =3D event; +} +void ga_set_load_avg_pdh_query(GAState *s, HQUERY query) +{ + s->load_avg_pdh_query =3D query; +} +HQUERY ga_get_load_avg_pdh_query(GAState *s) +{ + return s->load_avg_pdh_query; +} +#endif + static void become_daemon(const char *pidfile) { #ifndef _WIN32 @@ -1402,6 +1425,10 @@ static GAState *initialize_agent(GAConfig *config, i= nt socket_activation) g_debug("Guest agent version %s started", QEMU_FULL_VERSION); =20 #ifdef _WIN32 + s->load_avg_wait_handle =3D INVALID_HANDLE_VALUE; + s->load_avg_event =3D INVALID_HANDLE_VALUE; + s->load_avg_pdh_query =3D NULL; + s->event_log =3D RegisterEventSource(NULL, "qemu-ga"); if (!s->event_log) { g_autofree gchar *errmsg =3D g_win32_error_message(GetLastError()); @@ -1506,6 +1533,18 @@ static void cleanup_agent(GAState *s) #ifdef _WIN32 CloseHandle(s->wakeup_event); CloseHandle(s->event_log); + + if (s->load_avg_wait_handle !=3D INVALID_HANDLE_VALUE) { + UnregisterWait(s->load_avg_wait_handle); + } + + if (s->load_avg_event !=3D INVALID_HANDLE_VALUE) { + CloseHandle(s->load_avg_event); + } + + if (s->load_avg_pdh_query) { + PdhCloseQuery(s->load_avg_pdh_query); + } #endif if (s->command_state) { ga_command_state_cleanup_all(s->command_state); diff --git a/qga/meson.build b/qga/meson.build index 587ec4e5e8..89a4a8f713 100644 --- a/qga/meson.build +++ b/qga/meson.build @@ -95,7 +95,7 @@ gen_tlb =3D [] qga_libs =3D [] if host_os =3D=3D 'windows' qga_libs +=3D ['-lws2_32', '-lwinmm', '-lpowrprof', '-lwtsapi32', '-lwin= inet', '-liphlpapi', '-lnetapi32', - '-lsetupapi', '-lcfgmgr32', '-luserenv'] + '-lsetupapi', '-lcfgmgr32', '-luserenv', '-lpdh' ] if have_qga_vss qga_libs +=3D ['-lole32', '-loleaut32', '-lshlwapi', '-lstdc++', '-Wl,= --enable-stdcall-fixup'] subdir('vss-win32') diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json index 5316bfacbf..6d770f7b8e 100644 --- a/qga/qapi-schema.json +++ b/qga/qapi-schema.json @@ -1880,7 +1880,7 @@ 'load5m': 'number', 'load15m': 'number' }, - 'if': 'CONFIG_GETLOADAVG' + 'if': { 'any': ['CONFIG_WIN32', 'CONFIG_GETLOADAVG'] } } =20 ## @@ -1888,13 +1888,18 @@ # # Retrieve CPU process load information # +# .. note:: Windows does not have load average API, so QGA emulates it by +# calculating the average CPU usage in the last 1, 5, 15 minutes +# similar as Linux does this. +# Calculation starts from the first time this command is called. +# # Returns: load information # # Since: 10.0 ## { 'command': 'guest-get-load', 'returns': 'GuestLoadAverage', - 'if': 'CONFIG_GETLOADAVG' + 'if': { 'any': ['CONFIG_WIN32', 'CONFIG_GETLOADAVG'] } } =20 ## --=20 2.48.1 From nobody Sat Nov 15 15:30:22 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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charset="utf-8" Tested-by: Dehan Meng Reviewed-by: Yan Vugenfirer Signed-off-by: Konstantin Kostiuk --- tests/unit/test-qga.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tests/unit/test-qga.c b/tests/unit/test-qga.c index 541b08a5e7..587e30c7e4 100644 --- a/tests/unit/test-qga.c +++ b/tests/unit/test-qga.c @@ -332,6 +332,22 @@ static void test_qga_get_fsinfo(gconstpointer fix) } } =20 +static void test_qga_get_load(gconstpointer fix) +{ + const TestFixture *fixture =3D fix; + g_autoptr(QDict) ret =3D NULL; + QDict *load; + + ret =3D qmp_fd(fixture->fd, "{'execute': 'guest-get-load'}"); + g_assert_nonnull(ret); + qmp_assert_no_error(ret); + + load =3D qdict_get_qdict(ret, "return"); + g_assert(qdict_haskey(load, "load1m")); + g_assert(qdict_haskey(load, "load5m")); + g_assert(qdict_haskey(load, "load15m")); +} + static void test_qga_get_memory_block_info(gconstpointer fix) { const TestFixture *fixture =3D fix; @@ -1105,6 +1121,7 @@ int main(int argc, char **argv) g_test_add_data_func("/qga/get-vcpus", &fix, test_qga_get_vcpus); } g_test_add_data_func("/qga/get-fsinfo", &fix, test_qga_get_fsinfo); + g_test_add_data_func("/qga/get-load", &fix, test_qga_get_load); g_test_add_data_func("/qga/get-memory-block-info", &fix, test_qga_get_memory_block_info); g_test_add_data_func("/qga/get-memory-blocks", &fix, --=20 2.48.1