Apply preempt_rt patch-4.9-rt1.patch.xz

[zynq/linux.git] / mm / swap.c

diff --git a/mm/swap.c b/mm/swap.c
index 4dcf852e1e6d8f2e9f0eeca9ee39f620ea972957..69c3a5b2406092e99f83773073e932f37610e6ce 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -32,6 +32,7 @@
 #include <linux/memcontrol.h>
 #include <linux/gfp.h>
 #include <linux/uio.h>
+#include <linux/locallock.h>
 #include <linux/hugetlb.h>
 #include <linux/page_idle.h>
 
@@ -50,6 +51,8 @@ static DEFINE_PER_CPU(struct pagevec, lru_deactivate_pvecs);
 #ifdef CONFIG_SMP
 static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs);
 #endif
+static DEFINE_LOCAL_IRQ_LOCK(rotate_lock);
+DEFINE_LOCAL_IRQ_LOCK(swapvec_lock);
 
 /*
  * This path almost never happens for VM activity - pages are normally
@@ -240,11 +243,11 @@ void rotate_reclaimable_page(struct page *page)
                unsigned long flags;
 
                get_page(page);
-               local_irq_save(flags);
+               local_lock_irqsave(rotate_lock, flags);
                pvec = this_cpu_ptr(&lru_rotate_pvecs);
                if (!pagevec_add(pvec, page) || PageCompound(page))
                        pagevec_move_tail(pvec);
-               local_irq_restore(flags);
+               local_unlock_irqrestore(rotate_lock, flags);
        }
 }
 
@@ -294,12 +297,13 @@ void activate_page(struct page *page)
 {
        page = compound_head(page);
        if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-               struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
+               struct pagevec *pvec = &get_locked_var(swapvec_lock,
+                                                      activate_page_pvecs);
 
                get_page(page);
                if (!pagevec_add(pvec, page) || PageCompound(page))
                        pagevec_lru_move_fn(pvec, __activate_page, NULL);
-               put_cpu_var(activate_page_pvecs);
+               put_locked_var(swapvec_lock, activate_page_pvecs);
        }
 }
 
@@ -326,7 +330,7 @@ void activate_page(struct page *page)
 
 static void __lru_cache_activate_page(struct page *page)
 {
-       struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
+       struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
        int i;
 
        /*
@@ -348,7 +352,7 @@ static void __lru_cache_activate_page(struct page *page)
                }
        }
 
-       put_cpu_var(lru_add_pvec);
+       put_locked_var(swapvec_lock, lru_add_pvec);
 }
 
 /*
@@ -390,12 +394,12 @@ EXPORT_SYMBOL(mark_page_accessed);
 
 static void __lru_cache_add(struct page *page)
 {
-       struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
+       struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
 
        get_page(page);
        if (!pagevec_add(pvec, page) || PageCompound(page))
                __pagevec_lru_add(pvec);
-       put_cpu_var(lru_add_pvec);
+       put_locked_var(swapvec_lock, lru_add_pvec);
 }
 
 /**
@@ -593,9 +597,15 @@ void lru_add_drain_cpu(int cpu)
                unsigned long flags;
 
                /* No harm done if a racing interrupt already did this */
-               local_irq_save(flags);
+#ifdef CONFIG_PREEMPT_RT_BASE
+               local_lock_irqsave_on(rotate_lock, flags, cpu);
                pagevec_move_tail(pvec);
-               local_irq_restore(flags);
+               local_unlock_irqrestore_on(rotate_lock, flags, cpu);
+#else
+               local_lock_irqsave(rotate_lock, flags);
+               pagevec_move_tail(pvec);
+               local_unlock_irqrestore(rotate_lock, flags);
+#endif
        }
 
        pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
@@ -627,11 +637,12 @@ void deactivate_file_page(struct page *page)
                return;
 
        if (likely(get_page_unless_zero(page))) {
-               struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs);
+               struct pagevec *pvec = &get_locked_var(swapvec_lock,
+                                                      lru_deactivate_file_pvecs);
 
                if (!pagevec_add(pvec, page) || PageCompound(page))
                        pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL);
-               put_cpu_var(lru_deactivate_file_pvecs);
+               put_locked_var(swapvec_lock, lru_deactivate_file_pvecs);
        }
 }
 
@@ -646,27 +657,31 @@ void deactivate_file_page(struct page *page)
 void deactivate_page(struct page *page)
 {
        if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
-               struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs);
+               struct pagevec *pvec = &get_locked_var(swapvec_lock,
+                                                      lru_deactivate_pvecs);
 
                get_page(page);
                if (!pagevec_add(pvec, page) || PageCompound(page))
                        pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
-               put_cpu_var(lru_deactivate_pvecs);
+               put_locked_var(swapvec_lock, lru_deactivate_pvecs);
        }
 }
 
 void lru_add_drain(void)
 {
-       lru_add_drain_cpu(get_cpu());
-       put_cpu();
+       lru_add_drain_cpu(local_lock_cpu(swapvec_lock));
+       local_unlock_cpu(swapvec_lock);
 }
 
-static void lru_add_drain_per_cpu(struct work_struct *dummy)
+#ifdef CONFIG_PREEMPT_RT_BASE
+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
 {
-       lru_add_drain();
+       local_lock_on(swapvec_lock, cpu);
+       lru_add_drain_cpu(cpu);
+       local_unlock_on(swapvec_lock, cpu);
 }
 
-static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
+#else
 
 /*
  * lru_add_drain_wq is used to do lru_add_drain_all() from a WQ_MEM_RECLAIM
@@ -686,6 +701,22 @@ static int __init lru_init(void)
 }
 early_initcall(lru_init);
 
+static void lru_add_drain_per_cpu(struct work_struct *dummy)
+{
+       lru_add_drain();
+}
+
+static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
+{
+       struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
+
+       INIT_WORK(work, lru_add_drain_per_cpu);
+       queue_work_on(cpu, lru_add_drain_wq, work);
+       cpumask_set_cpu(cpu, has_work);
+}
+#endif
+
 void lru_add_drain_all(void)
 {
        static DEFINE_MUTEX(lock);
@@ -697,21 +728,18 @@ void lru_add_drain_all(void)
        cpumask_clear(&has_work);
 
        for_each_online_cpu(cpu) {
-               struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
-
                if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) ||
                    pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) ||
                    pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) ||
                    pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) ||
-                   need_activate_page_drain(cpu)) {
-                       INIT_WORK(work, lru_add_drain_per_cpu);
-                       queue_work_on(cpu, lru_add_drain_wq, work);
-                       cpumask_set_cpu(cpu, &has_work);
-               }
+                   need_activate_page_drain(cpu))
+                       remote_lru_add_drain(cpu, &has_work);
        }
 
+#ifndef CONFIG_PREEMPT_RT_BASE
        for_each_cpu(cpu, &has_work)
                flush_work(&per_cpu(lru_add_drain_work, cpu));
+#endif
 
        put_online_cpus();
        mutex_unlock(&lock);