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Subject[PATCH 2/8] mm, truncate: Do not check mapping for every page being truncated
Date
During truncation, the mapping has already been checked for shmem and dax
so it's known that workingset_update_node is required. This patch avoids
the checks on mapping for each page being truncated. In all other cases,
a lookup helper is used to determine if workingset_update_node() needs
to be called. The one danger is that the API is slightly harder to use as
calling workingset_update_node directly without checking for dax or shmem
mappings could lead to surprises. However, the API rarely needs to be used
and hopefully the comment is enough to give people the hint.

sparsetruncate (tiny)
4.14.0-rc4 4.14.0-rc4
oneirq-v1r1 pickhelper-v1r1
Min Time 141.00 ( 0.00%) 140.00 ( 0.71%)
1st-qrtle Time 142.00 ( 0.00%) 141.00 ( 0.70%)
2nd-qrtle Time 142.00 ( 0.00%) 142.00 ( 0.00%)
3rd-qrtle Time 143.00 ( 0.00%) 143.00 ( 0.00%)
Max-90% Time 144.00 ( 0.00%) 144.00 ( 0.00%)
Max-95% Time 147.00 ( 0.00%) 145.00 ( 1.36%)
Max-99% Time 195.00 ( 0.00%) 191.00 ( 2.05%)
Max Time 230.00 ( 0.00%) 205.00 ( 10.87%)
Amean Time 144.37 ( 0.00%) 143.82 ( 0.38%)
Stddev Time 10.44 ( 0.00%) 9.00 ( 13.74%)
Coeff Time 7.23 ( 0.00%) 6.26 ( 13.41%)
Best99%Amean Time 143.72 ( 0.00%) 143.34 ( 0.26%)
Best95%Amean Time 142.37 ( 0.00%) 142.00 ( 0.26%)
Best90%Amean Time 142.19 ( 0.00%) 141.85 ( 0.24%)
Best75%Amean Time 141.92 ( 0.00%) 141.58 ( 0.24%)
Best50%Amean Time 141.69 ( 0.00%) 141.31 ( 0.27%)
Best25%Amean Time 141.38 ( 0.00%) 140.97 ( 0.29%)

As you'd expect, the gain is marginal but it can be detected. The differences
in bonnie are all within the noise which is not surprising given the impact
on the microbenchmark.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
include/linux/swap.h | 11 +++++++++++
mm/filemap.c | 7 ++++---
mm/workingset.c | 8 +-------
3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 8a807292037f..78ecacb52095 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -292,8 +292,19 @@ struct vma_swap_readahead {
void *workingset_eviction(struct address_space *mapping, struct page *page);
bool workingset_refault(void *shadow);
void workingset_activation(struct page *page);
+
+/* Do not use directly, use workingset_lookup_update */
void workingset_update_node(struct radix_tree_node *node, void *private);

+/* Returns workingset_update_node() if the mapping has shadow entries. */
+#define workingset_lookup_update(mapping) \
+({ \
+ radix_tree_update_node_t __helper = workingset_update_node; \
+ if (dax_mapping(mapping) || shmem_mapping(mapping)) \
+ __helper = NULL; \
+ __helper; \
+})
+
/* linux/mm/page_alloc.c */
extern unsigned long totalram_pages;
extern unsigned long totalreserve_pages;
diff --git a/mm/filemap.c b/mm/filemap.c
index dba68e1d9869..d8719d755ca9 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -35,6 +35,7 @@
#include <linux/hugetlb.h>
#include <linux/memcontrol.h>
#include <linux/cleancache.h>
+#include <linux/shmem_fs.h>
#include <linux/rmap.h>
#include "internal.h"

@@ -134,7 +135,7 @@ static int page_cache_tree_insert(struct address_space *mapping,
*shadowp = p;
}
__radix_tree_replace(&mapping->page_tree, node, slot, page,
- workingset_update_node, mapping);
+ workingset_lookup_update(mapping), mapping);
mapping->nrpages++;
return 0;
}
@@ -162,7 +163,7 @@ static void page_cache_tree_delete(struct address_space *mapping,

radix_tree_clear_tags(&mapping->page_tree, node, slot);
__radix_tree_replace(&mapping->page_tree, node, slot, shadow,
- workingset_update_node, mapping);
+ workingset_lookup_update(mapping), mapping);
}

page->mapping = NULL;
@@ -360,7 +361,7 @@ page_cache_tree_delete_batch(struct address_space *mapping, int count,
}
radix_tree_clear_tags(&mapping->page_tree, iter.node, slot);
__radix_tree_replace(&mapping->page_tree, iter.node, slot, NULL,
- workingset_update_node, mapping);
+ workingset_lookup_update(mapping), mapping);
total_pages++;
}
mapping->nrpages -= total_pages;
diff --git a/mm/workingset.c b/mm/workingset.c
index 7119cd745ace..a80d52387734 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -341,12 +341,6 @@ static struct list_lru shadow_nodes;

void workingset_update_node(struct radix_tree_node *node, void *private)
{
- struct address_space *mapping = private;
-
- /* Only regular page cache has shadow entries */
- if (dax_mapping(mapping) || shmem_mapping(mapping))
- return;
-
/*
* Track non-empty nodes that contain only shadow entries;
* unlink those that contain pages or are being freed.
@@ -474,7 +468,7 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
goto out_invalid;
inc_lruvec_page_state(virt_to_page(node), WORKINGSET_NODERECLAIM);
__radix_tree_delete_node(&mapping->page_tree, node,
- workingset_update_node, mapping);
+ workingset_lookup_update(mapping), mapping);

out_invalid:
spin_unlock(&mapping->tree_lock);
--
2.14.0
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