There is now a memory limit for the poller

boot.php

@@ -1321,6 +1321,45 @@ class App {
 		return false;
 	}
 
+	/**
+	 * @brief Checks if the minimal memory is reached
+	 *
+	 * @return bool Is the memory limit reached?
+	 */
+	public function min_memory_reached() {
+		$min_memory = Config::get('system', 'min_memory', 0);
+		if ($min_memory == 0) {
+			return false;
+		}
+
+		if (!is_readable("/proc/meminfo")) {
+			return false;
+		}
+
+		$memdata = explode("\n", file_get_contents('/proc/meminfo'));
+
+		$meminfo = array();
+		foreach ($memdata as $line) {
+			list($key, $val) = explode(":", $line);
+			$meminfo[$key] = (int)trim(str_replace("kB", "", $val));
+			$meminfo[$key] = (int)($meminfo[$key] / 1024);
+		}
+
+		if (!isset($meminfo['MemAvailable']) OR !isset($meminfo['MemFree'])) {
+			return false;
+		}
+
+		$free = $meminfo['MemAvailable'] + $meminfo['MemFree'];
+
+		$reached = ($free < $min_memory);
+
+		if ($reached) {
+			logger('Minimal memory reached: '.$free.'/'.$meminfo['MemTotal'].' - limit '.$min_memory, LOGGER_DEBUG);
+		}
+
+		return $reached;
+	}
+
 	/**
 	 * @brief Checks if the maximum load is reached
 	 *

include/poller.php

@@ -41,6 +41,10 @@ function poller_run($argv, $argc){
 
 	$a->start_process();
 
+	if ($a->min_memory_reached()) {
+		return;
+	}
+
 	if (poller_max_connections_reached()) {
 		return;
 	}

mod/admin.php

@@ -731,6 +731,7 @@ function admin_page_site_post(App $a) {
 	$timeout		=	((x($_POST,'timeout'))			? intval(trim($_POST['timeout']))		: 60);
 	$maxloadavg		=	((x($_POST,'maxloadavg'))		? intval(trim($_POST['maxloadavg']))		: 50);
 	$maxloadavg_frontend	=	((x($_POST,'maxloadavg_frontend'))	? intval(trim($_POST['maxloadavg_frontend']))	: 50);
+	$min_memory		=	((x($_POST,'min_memory'))		? intval(trim($_POST['min_memory']))		: 0);
 	$optimize_max_tablesize	=	((x($_POST,'optimize_max_tablesize'))	? intval(trim($_POST['optimize_max_tablesize'])): 100);
 	$optimize_fragmentation	=	((x($_POST,'optimize_fragmentation'))	? intval(trim($_POST['optimize_fragmentation'])): 30);
 	$poco_completion	=	((x($_POST,'poco_completion'))		? intval(trim($_POST['poco_completion']))	: false);
@@ -816,6 +817,7 @@ function admin_page_site_post(App $a) {
 	set_config('system','ssl_policy',$ssl_policy);
 	set_config('system','maxloadavg',$maxloadavg);
 	set_config('system','maxloadavg_frontend',$maxloadavg_frontend);
+	set_config('system','min_memory',$min_memory);
 	set_config('system','optimize_max_tablesize',$optimize_max_tablesize);
 	set_config('system','optimize_fragmentation',$optimize_fragmentation);
 	set_config('system','poco_completion',$poco_completion);
@@ -1113,6 +1115,7 @@ function admin_page_site(App $a) {
 		'$timeout'		=> array('timeout', t("Network timeout"), (x(get_config('system','curl_timeout'))?get_config('system','curl_timeout'):60), t("Value is in seconds. Set to 0 for unlimited (not recommended).")),
 		'$maxloadavg'		=> array('maxloadavg', t("Maximum Load Average"), ((intval(get_config('system','maxloadavg')) > 0)?get_config('system','maxloadavg'):50), t("Maximum system load before delivery and poll processes are deferred - default 50.")),
 		'$maxloadavg_frontend'	=> array('maxloadavg_frontend', t("Maximum Load Average (Frontend)"), ((intval(get_config('system','maxloadavg_frontend')) > 0)?get_config('system','maxloadavg_frontend'):50), t("Maximum system load before the frontend quits service - default 50.")),
+		'$min_memory'		=> array('min_memory', t("Minimal Memory"), ((intval(get_config('system','min_memory')) > 0)?get_config('system','min_memory'):0), t("Minimal free memory in MB for the poller. Needs access to /proc/meminfo - default 0 (deactivated).")),
 		'$optimize_max_tablesize'=> array('optimize_max_tablesize', t("Maximum table size for optimization"), $optimize_max_tablesize, t("Maximum table size (in MB) for the automatic optimization - default 100 MB. Enter -1 to disable it.")),
 		'$optimize_fragmentation'=> array('optimize_fragmentation', t("Minimum level of fragmentation"), ((intval(get_config('system','optimize_fragmentation')) > 0)?get_config('system','optimize_fragmentation'):30), t("Minimum fragmenation level to start the automatic optimization - default value is 30%.")),
 

view/templates/admin_site.tpl

@@ -118,7 +118,6 @@
 	{{include file="field_input.tpl" field=$proxy}}
 	{{include file="field_input.tpl" field=$proxyuser}}
 	{{include file="field_input.tpl" field=$timeout}}
-	{{include file="field_input.tpl" field=$maxloadavg}}
 	{{include file="field_input.tpl" field=$maxloadavg_frontend}}
 	{{include file="field_input.tpl" field=$optimize_max_tablesize}}
 	{{include file="field_input.tpl" field=$optimize_fragmentation}}
@@ -146,6 +145,8 @@
 	<div class="submit"><input type="submit" name="page_site" value="{{$submit|escape:'html'}}" /></div>
 
 	<h3>{{$worker_title}}</h3>
+	{{include file="field_input.tpl" field=$maxloadavg}}
+	{{include file="field_input.tpl" field=$min_memory}}
 	{{include file="field_input.tpl" field=$worker_queues}}
 	{{include file="field_checkbox.tpl" field=$worker_dont_fork}}
 	{{include file="field_checkbox.tpl" field=$worker_fastlane}}