Merge tag 'qga-pull-2025-01-06' of https://github.com/kostyanf14/qemu into staging

qga-pull-2025-01-06

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* tag 'qga-pull-2025-01-06' of https://github.com/kostyanf14/qemu:
  qemu-ga: Optimize freeze-hook script logic of logging error
  qga: implement a 'guest-get-load' command

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

meson.build

@@ -2646,6 +2646,7 @@ config_host_data.set('CONFIG_SETNS', cc.has_function('setns') and cc.has_functio
 config_host_data.set('CONFIG_SYNCFS', cc.has_function('syncfs'))
 config_host_data.set('CONFIG_SYNC_FILE_RANGE', cc.has_function('sync_file_range'))
 config_host_data.set('CONFIG_TIMERFD', cc.has_function('timerfd_create'))
+config_host_data.set('CONFIG_GETLOADAVG', cc.has_function('getloadavg'))
 config_host_data.set('HAVE_COPY_FILE_RANGE', cc.has_function('copy_file_range'))
 config_host_data.set('HAVE_GETIFADDRS', cc.has_function('getifaddrs'))
 config_host_data.set('HAVE_GLIB_WITH_SLICE_ALLOCATOR', glib_has_gslice)

qga/commands-posix.c

@@ -1368,3 +1368,23 @@ char *qga_get_host_name(Error **errp)
 
     return g_steal_pointer(&hostname);
 }
+
+#ifdef CONFIG_GETLOADAVG
+GuestLoadAverage *qmp_guest_get_load(Error **errp)
+{
+    double loadavg[3];
+    GuestLoadAverage *ret = NULL;
+
+    if (getloadavg(loadavg, G_N_ELEMENTS(loadavg)) < 0) {
+        error_setg_errno(errp, errno,
+                         "cannot query load average");
+        return NULL;
+    }
+
+    ret = g_new0(GuestLoadAverage, 1);
+    ret->load1m = loadavg[0];
+    ret->load5m = loadavg[1];
+    ret->load15m = loadavg[2];
+    return ret;
+}
+#endif

qga/qapi-schema.json

@@ -1843,6 +1843,43 @@
   'if': 'CONFIG_LINUX'
 }
 
+
+##
+# @GuestLoadAverage:
+#
+# Statistics about process load information
+#
+# @load1m: 1-minute load avage
+#
+# @load5m: 5-minute load avage
+#
+# @load15m: 15-minute load avage
+#
+# Since: 10.0
+##
+{ 'struct': 'GuestLoadAverage',
+  'data': {
+      'load1m': 'number',
+      'load5m': 'number',
+      'load15m': 'number'
+  },
+  'if': 'CONFIG_GETLOADAVG'
+}
+
+##
+# @guest-get-load:
+#
+# Retrieve CPU process load information
+#
+# Returns: load information
+#
+# Since: 10.0
+##
+{ 'command': 'guest-get-load',
+  'returns': 'GuestLoadAverage',
+  'if': 'CONFIG_GETLOADAVG'
+}
+
 ##
 # @GuestNetworkRoute:
 #

scripts/qemu-guest-agent/fsfreeze-hook

@@ -19,15 +19,43 @@ is_ignored_file() {
     return 1
 }
 
+USE_SYSLOG=0
+# if log file is not writable, fallback to syslog
+[ ! -w "$LOGFILE" ] && USE_SYSLOG=1
+# try to update log file and fallback to syslog if it fails
+touch "$LOGFILE" &>/dev/null || USE_SYSLOG=1
+
+# Ensure the log file is writable, fallback to syslog if not
+log_message() {
+    local message="$1"
+    if [ "$USE_SYSLOG" -eq 0 ]; then
+        printf "%s: %s\n" "$(date)" "$message" >>"$LOGFILE"
+    else
+        logger -t qemu-ga-freeze-hook "$message"
+    fi
+}
+
 # Iterate executables in directory "fsfreeze-hook.d" with the specified args
 [ ! -d "$FSFREEZE_D" ] && exit 0
+
 for file in "$FSFREEZE_D"/* ; do
     is_ignored_file "$file" && continue
     [ -x "$file" ] || continue
-    printf "$(date): execute $file $@\n" >>$LOGFILE
-    "$file" "$@" >>$LOGFILE 2>&1
-    STATUS=$?
-    printf "$(date): $file finished with status=$STATUS\n" >>$LOGFILE
+
+    log_message "Executing $file $@"
+    if [ "$USE_SYSLOG" -eq 0 ]; then
+        "$file" "$@" >>"$LOGFILE" 2>&1
+        STATUS=$?
+    else
+        "$file" "$@" 2>&1 | logger -t qemu-ga-freeze-hook
+        STATUS=${PIPESTATUS[0]}
+    fi
+
+    if [ $STATUS -ne 0 ]; then
+        log_message "Error: $file finished with status=$STATUS"
+    else
+        log_message "$file finished successfully"
+    fi
 done
 
 exit 0