irqbalance/bugfix-fix-new-irqs-in-hotplug-keep-stay-on-one-numa.patch

From feeb95206e1f178e2bbf0393483861f364bd7d5b Mon Sep 17 00:00:00 2001
From: liuchao173 <liuchao173@huawei.com>
Date: Wed, 23 Oct 2019 11:38:17 +0000
Subject: [PATCH] irqbalance: fix new irqs in hotplug keep stay on one numa node

	when the number of cpus is huge, hotplug occurs and new irqs will stay on one numa node
---
 classify.c       | 25 +++++++++++++++++++++++++
 procinterrupts.c | 24 +++++++++++++++++++++---
 rules_config.c   |  4 ++++
 3 files changed, 50 insertions(+), 3 deletions(-)

diff --git a/classify.c b/classify.c
index 3681c48..54f27f0 100644
--- a/classify.c
+++ b/classify.c
@@ -38,6 +38,7 @@ static GList *banned_irqs = NULL;
 GList *cl_banned_irqs = NULL;
 static GList *cl_banned_modules = NULL;
 GList *vm_banned_irqs = NULL;
+extern int need_add_single;
 
 pthread_mutex_t cl_banned_list_mutex = PTHREAD_MUTEX_INITIALIZER;
 pthread_mutex_t vm_banned_list_mutex = PTHREAD_MUTEX_INITIALIZER;
@@ -646,6 +647,21 @@ static int check_for_irq_ban(char *path __attribute__((unused)), int irq, GList
 	return 0;
 }
 
+int is_proc_irq_info_exist(int irq, GList *tmp_list)
+{
+	GList *entry;
+	struct irq_info find;
+
+	if (!tmp_list) {
+		return 1;
+	}
+
+	find.irq = irq;
+	entry = g_list_find_custom(tmp_list, &find, compare_ints);
+
+	return entry ? 1 : 0;
+}
+
 /*
  * Figures out which interrupt(s) relate to the device we"re looking at in dirname
  */
@@ -686,6 +702,12 @@ struct irq_info *build_one_dev_entry(const char *dirname, GList *tmp_list)
 					add_banned_irq(irqnum, &banned_irqs, 0);
 					continue;
 				}
+				if (!is_proc_irq_info_exist(irqnum, tmp_list)) {
+					continue;
+				}
+				if (need_add_single && need_add_single != irqnum) {
+					continue;
+				}
 				hint.irq = irqnum;
 				hint.type = IRQ_TYPE_MSIX;
 				new = add_one_irq_to_db(devpath, &hint, &pol);
@@ -723,6 +745,9 @@ struct irq_info *build_one_dev_entry(const char *dirname, GList *tmp_list)
 			add_banned_irq(irqnum, &banned_irqs, 0);
 			goto done;
 		}
+		if (!is_proc_irq_info_exist(irqnum, tmp_list)) {
+			goto done;
+		}
 
 		hint.irq = irqnum;
 		hint.type = IRQ_TYPE_LEGACY;
diff --git a/procinterrupts.c b/procinterrupts.c
index c32c1b2..f0dd608 100644
--- a/procinterrupts.c
+++ b/procinterrupts.c
@@ -43,6 +43,7 @@
 static int proc_int_has_msi = 0;
 static int msi_found_in_sysfs = 0;
 extern int ban_pci_assigned_irq;
+int need_add_single = 0;
 
 #ifdef AARCH64
 struct irq_match {
@@ -361,9 +362,10 @@ void parse_proc_interrupts(void)
 		uint64_t count;
 		char *c, *c2;
 		struct irq_info *info;
-		struct irq_info tmp_info;
-		char savedline[1024];
+		struct irq_info tmp_info = {0};
+		char *savedline = NULL;
 		char dirname[PATH_MAX] = {'\0'};
+		struct irq_info *lookup;
 
 		if (getline(&line, &size, file)<=0)
 			break;
@@ -383,7 +385,9 @@ void parse_proc_interrupts(void)
 		if (!c)
 			continue;
 
-		strncpy(savedline, line, sizeof(savedline)-1);
+		savedline = strdup(line);
+		if (!savedline)
+			continue;
 
 		*c = 0;
 		c++;
@@ -391,23 +395,36 @@ void parse_proc_interrupts(void)
 
 		info = get_irq_info(number);
 		if (!info) {
+			init_irq_class_and_type(savedline, &tmp_info, number);
 			find_irq_dev_path(number, dirname, PATH_MAX);
 			if (strlen(dirname) > 0) {
+				need_add_single = number;
 				info = build_one_dev_entry(dirname, NULL);
+				need_add_single = 0;
+				lookup = get_irq_info(number);
+				if (lookup != NULL) {
+					lookup->existing = 1;
+					set_usr_irq_policy(tmp_info.name, lookup);
+				}
 				log(TO_CONSOLE, LOG_INFO, "new IRQ %d added into database, dirname %s\n", number, dirname);
 			} else {
-				init_irq_class_and_type(savedline, &tmp_info, number);
 				info = add_new_irq(number, &tmp_info, NULL);
 			}
+			if (tmp_info.name) {
+				free(tmp_info.name);
+				tmp_info.name = NULL;
+			}
 
 			if (info) {
 				force_rebalance_irq(info, NULL);
 				log(TO_CONSOLE, LOG_INFO, "new IRQ %d added into rebalance list\n", number);
 			} else {
 				need_rescan = 1;
+				free(savedline);
 				break;
 			}
 		}
+		free(savedline);
 		info->existing = 1;
 
 		if (ban_pci_assigned_irq) {
diff --git a/rules_config.c b/rules_config.c
index 767e9e1..9313fc6 100644
--- a/rules_config.c
+++ b/rules_config.c
@@ -43,6 +43,10 @@ void set_usr_irq_policy(char *name, struct irq_info *info)
 {
 	USER_IRQ_POLICY *user_policy;
 
+	if (user_policy_list == NULL) {
+		return;
+	}
+
 	user_policy = get_usr_irq_policy(name);
 	if (user_policy != NULL) {
 		if (user_policy->numa_node_set) {
-- 
2.19.1