atm: idt77252: fix a memleak in open_card_ubr0

[platform/kernel/linux-rpi.git] / mm / vmstat.c

diff --git a/mm/vmstat.c b/mm/vmstat.c
index c280463..00e81e9 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -26,8 +26,8 @@
 #include <linux/writeback.h>
 #include <linux/compaction.h>
 #include <linux/mm_inline.h>
-#include <linux/page_ext.h>
 #include <linux/page_owner.h>
+#include <linux/sched/isolation.h>
 
 #include "internal.h"
 
@@ -1180,6 +1180,9 @@ const char * const vmstat_text[] = {
        "nr_zspages",
 #endif
        "nr_free_cma",
+#ifdef CONFIG_UNACCEPTED_MEMORY
+       "nr_unaccepted",
+#endif
 
        /* enum numa_stat_item counters */
 #ifdef CONFIG_NUMA
@@ -2022,6 +2025,20 @@ static void vmstat_shepherd(struct work_struct *w)
        for_each_online_cpu(cpu) {
                struct delayed_work *dw = &per_cpu(vmstat_work, cpu);
 
+               /*
+                * In kernel users of vmstat counters either require the precise value and
+                * they are using zone_page_state_snapshot interface or they can live with
+                * an imprecision as the regular flushing can happen at arbitrary time and
+                * cumulative error can grow (see calculate_normal_threshold).
+                *
+                * From that POV the regular flushing can be postponed for CPUs that have
+                * been isolated from the kernel interference without critical
+                * infrastructure ever noticing. Skip regular flushing from vmstat_shepherd
+                * for all isolated CPUs to avoid interference with the isolated workload.
+                */
+               if (cpu_is_isolated(cpu))
+                       continue;
+
                if (!delayed_work_pending(dw) && need_update(cpu))
                        queue_delayed_work_on(cpu, mm_percpu_wq, dw, 0);