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Message-Id: <1585892447-32059-7-git-send-email-iamjoonsoo.kim@lge.com>
Date: Fri, 3 Apr 2020 14:40:44 +0900
From: js1304@...il.com
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>,
Hugh Dickins <hughd@...gle.com>,
Minchan Kim <minchan@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>,
Mel Gorman <mgorman@...hsingularity.net>, kernel-team@....com,
Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v5 06/10] mm/swap: implement workingset detection for anonymous LRU
From: Joonsoo Kim <iamjoonsoo.kim@....com>
This patch implements workingset detection for anonymous LRU.
All the infrastructure is implemented by the previous patches so this patch
just activates the workingset detection by installing/retrieving
the shadow entry.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
include/linux/swap.h | 6 ++++++
mm/memory.c | 8 ++++++++
mm/swap.c | 3 +--
mm/swap_state.c | 22 ++++++++++++++++++++--
mm/vmscan.c | 7 +++++--
5 files changed, 40 insertions(+), 6 deletions(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index eea0700..97e8a2e 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -408,6 +408,7 @@ extern struct address_space *swapper_spaces[];
extern unsigned long total_swapcache_pages(void);
extern void show_swap_cache_info(void);
extern int add_to_swap(struct page *page);
+extern void *get_shadow_from_swap_cache(swp_entry_t entry);
extern int add_to_swap_cache(struct page *page, swp_entry_t entry,
struct vm_area_struct *vma, gfp_t gfp, void **shadowp);
extern int __add_to_swap_cache(struct page *page, swp_entry_t entry);
@@ -566,6 +567,11 @@ static inline int add_to_swap(struct page *page)
return 0;
}
+static inline void *get_shadow_from_swap_cache(swp_entry_t entry)
+{
+ return NULL;
+}
+
static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
struct vm_area_struct *vma, gfp_t gfp, void **shadowp)
{
diff --git a/mm/memory.c b/mm/memory.c
index 127379a..9effb23 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2945,6 +2945,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
int locked;
int exclusive = 0;
vm_fault_t ret = 0;
+ void *shadow = NULL;
if (!pte_unmap_same(vma->vm_mm, vmf->pmd, vmf->pte, vmf->orig_pte))
goto out;
@@ -2983,6 +2984,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
__SetPageLocked(page);
__SetPageSwapBacked(page);
set_page_private(page, entry.val);
+ shadow = get_shadow_from_swap_cache(entry);
lru_cache_add_anon(page);
swap_readpage(page, true);
}
@@ -3099,6 +3101,12 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
mem_cgroup_commit_charge(page, memcg, true, false);
}
+ if (shadow) {
+ workingset_refault(page, shadow);
+ if (PageActive(page) && PageLRU(page))
+ activate_page(page);
+ }
+
swap_free(entry);
if (mem_cgroup_swap_full(page) ||
(vma->vm_flags & VM_LOCKED) || PageMlocked(page))
diff --git a/mm/swap.c b/mm/swap.c
index d14a2fd..d9f2005 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -394,8 +394,7 @@ void mark_page_accessed(struct page *page)
else
__lru_cache_activate_page(page);
ClearPageReferenced(page);
- if (page_is_file_cache(page))
- workingset_activation(page);
+ workingset_activation(page);
}
if (page_is_idle(page))
clear_page_idle(page);
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 1db73a2..de994f9 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -107,6 +107,20 @@ void show_swap_cache_info(void)
printk("Total swap = %lukB\n", total_swap_pages << (PAGE_SHIFT - 10));
}
+void *get_shadow_from_swap_cache(swp_entry_t entry)
+{
+ struct address_space *address_space = swap_address_space(entry);
+ pgoff_t idx = swp_offset(entry);
+ struct page *page;
+
+ page = find_get_entry(address_space, idx);
+ if (xa_is_value(page))
+ return page;
+ if (page)
+ put_page(page);
+ return NULL;
+}
+
/*
* add_to_swap_cache resembles add_to_page_cache_locked on swapper_space,
* but sets SwapCache flag and private instead of mapping and index.
@@ -393,6 +407,7 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
struct page *found_page = NULL, *new_page = NULL;
struct swap_info_struct *si;
int err;
+ void *shadow;
*new_page_allocated = false;
do {
@@ -448,12 +463,15 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
/* May fail (-ENOMEM) if XArray node allocation failed. */
__SetPageLocked(new_page);
__SetPageSwapBacked(new_page);
+ shadow = NULL;
err = add_to_swap_cache(new_page, entry, vma,
- gfp_mask & GFP_KERNEL, NULL);
+ gfp_mask & GFP_KERNEL, &shadow);
if (likely(!err)) {
/* Initiate read into locked page */
SetPageWorkingset(new_page);
- lru_cache_add_anon(new_page);
+ if (shadow)
+ workingset_refault(new_page, shadow);
+ lru_cache_add(new_page);
*new_page_allocated = true;
return new_page;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d46e3e5..d8aa42a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -853,6 +853,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
{
unsigned long flags;
int refcount;
+ void *shadow = NULL;
BUG_ON(!PageLocked(page));
BUG_ON(mapping != page_mapping(page));
@@ -895,12 +896,13 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
if (PageSwapCache(page)) {
swp_entry_t swap = { .val = page_private(page) };
mem_cgroup_swapout(page, swap);
- __delete_from_swap_cache(page, swap, NULL);
+ if (reclaimed && !mapping_exiting(mapping))
+ shadow = workingset_eviction(page, target_memcg);
+ __delete_from_swap_cache(page, swap, shadow);
xa_unlock_irqrestore(&mapping->i_pages, flags);
put_swap_page(page, swap);
} else {
void (*freepage)(struct page *);
- void *shadow = NULL;
freepage = mapping->a_ops->freepage;
/*
@@ -1462,6 +1464,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
SetPageActive(page);
stat->nr_activate[type] += nr_pages;
count_memcg_page_event(page, PGACTIVATE);
+ workingset_activation(page);
}
keep_locked:
unlock_page(page);
--
2.7.4
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