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From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:51 -0500
Subject: mm/swap: Convert to percpu locked
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.9-rt3.tar.xz
Replace global locks (get_cpu + local_irq_save) with "local_locks()".
Currently there is one of for "rotate" and one for "swap".
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/swap.h | 2 ++
mm/compaction.c | 6 ++++--
mm/page_alloc.c | 3 ++-
mm/swap.c | 38 ++++++++++++++++++++++----------------
4 files changed, 30 insertions(+), 19 deletions(-)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -12,6 +12,7 @@
#include <linux/fs.h>
#include <linux/atomic.h>
#include <linux/page-flags.h>
+#include <linux/locallock.h>
#include <asm/page.h>
struct notifier_block;
@@ -329,6 +330,7 @@ extern unsigned long nr_free_pagecache_p
/* linux/mm/swap.c */
+DECLARE_LOCAL_IRQ_LOCK(swapvec_lock);
extern void lru_cache_add(struct page *);
extern void lru_cache_add_anon(struct page *page);
extern void lru_cache_add_file(struct page *page);
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2229,10 +2229,12 @@ compact_zone(struct compact_control *cc,
block_start_pfn(cc->migrate_pfn, cc->order);
if (last_migrated_pfn < current_block_start) {
- cpu = get_cpu();
+ cpu = get_cpu_light();
+ local_lock_irq(swapvec_lock);
lru_add_drain_cpu(cpu);
+ local_unlock_irq(swapvec_lock);
drain_local_pages(cc->zone);
- put_cpu();
+ put_cpu_light();
/* No more flushing until we migrate again */
last_migrated_pfn = 0;
}
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7583,8 +7583,9 @@ void __init free_area_init(unsigned long
static int page_alloc_cpu_dead(unsigned int cpu)
{
-
+ local_lock_irq_on(swapvec_lock, cpu);
lru_add_drain_cpu(cpu);
+ local_unlock_irq_on(swapvec_lock, cpu);
drain_pages(cpu);
/*
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -33,6 +33,7 @@
#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>
@@ -51,6 +52,8 @@ static DEFINE_PER_CPU(struct pagevec, lr
#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
@@ -253,11 +256,11 @@ void rotate_reclaimable_page(struct 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);
}
}
@@ -307,12 +310,13 @@ 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);
}
}
@@ -334,7 +338,7 @@ 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;
/*
@@ -356,7 +360,7 @@ static void __lru_cache_activate_page(st
}
}
- put_cpu_var(lru_add_pvec);
+ put_locked_var(swapvec_lock, lru_add_pvec);
}
/*
@@ -398,12 +402,12 @@ 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);
}
/**
@@ -581,9 +585,9 @@ void lru_add_drain_cpu(int cpu)
unsigned long flags;
/* No harm done if a racing interrupt already did this */
- local_irq_save(flags);
+ local_lock_irqsave(rotate_lock, flags);
pagevec_move_tail(pvec);
- local_irq_restore(flags);
+ local_unlock_irqrestore(rotate_lock, flags);
}
pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
@@ -615,11 +619,12 @@ void deactivate_file_page(struct page *p
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);
}
}
@@ -634,19 +639,20 @@ void mark_page_lazyfree(struct page *pag
{
if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
!PageSwapCache(page) && !PageUnevictable(page)) {
- struct pagevec *pvec = &get_cpu_var(lru_lazyfree_pvecs);
+ struct pagevec *pvec = &get_locked_var(swapvec_lock,
+ lru_lazyfree_pvecs);
get_page(page);
if (!pagevec_add(pvec, page) || PageCompound(page))
pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
- put_cpu_var(lru_lazyfree_pvecs);
+ put_locked_var(swapvec_lock, lru_lazyfree_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);
}
#ifdef CONFIG_SMP
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