Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
>
> The patch makes add_to_page_cache_locked() cleaner:
> - unindent most code of the function by inverting one condition;
> - streamline code no-error path;
> - move insert error path outside normal code path;
> - call radix_tree_preload_end() earlier;
>
> No functional changes.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> ---
...
> + spin_lock_irq(&mapping->tree_lock);
> + error = radix_tree_insert(&mapping->page_tree, offset, page);
> + radix_tree_preload_end();
> + if (unlikely(!error))
> + goto err_insert;
Nadav Shemer noticed mistake here. It should be 'if (unlikely(error))'.
I've missed this during becase it was fixed by other patch in my
thp-pagecache series.
Fixed patch is below. Retested with this patchset applied only.
Looks okay now.
Sorry for this.
---
>From 0c74a39660f41a6c9504e3b4ec7a1ba3433af2a3 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Date: Thu, 23 May 2013 16:08:12 +0300
Subject: [PATCH] mm: cleanup add_to_page_cache_locked()
The patch makes add_to_page_cache_locked() cleaner:
- unindent most code of the function by inverting one condition;
- streamline code no-error path;
- move insert error path outside normal code path;
- call radix_tree_preload_end() earlier;
No functional changes.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
mm/filemap.c | 48 +++++++++++++++++++++++++-----------------------
1 file changed, 25 insertions(+), 23 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index f6fe61f..f1ca99c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -467,32 +467,34 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
error = mem_cgroup_cache_charge(page, current->mm,
gfp_mask & GFP_RECLAIM_MASK);
if (error)
- goto out;
+ return error;
error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM);
- if (error == 0) {
- page_cache_get(page);
- page->mapping = mapping;
- page->index = offset;
-
- spin_lock_irq(&mapping->tree_lock);
- error = radix_tree_insert(&mapping->page_tree, offset, page);
- if (likely(!error)) {
- mapping->nrpages++;
- __inc_zone_page_state(page, NR_FILE_PAGES);
- spin_unlock_irq(&mapping->tree_lock);
- trace_mm_filemap_add_to_page_cache(page);
- } else {
- page->mapping = NULL;
- /* Leave page->index set: truncation relies upon it */
- spin_unlock_irq(&mapping->tree_lock);
- mem_cgroup_uncharge_cache_page(page);
- page_cache_release(page);
- }
- radix_tree_preload_end();
- } else
+ if (error) {
mem_cgroup_uncharge_cache_page(page);
-out:
+ return error;
+ }
+
+ page_cache_get(page);
+ page->mapping = mapping;
+ page->index = offset;
+
+ spin_lock_irq(&mapping->tree_lock);
+ error = radix_tree_insert(&mapping->page_tree, offset, page);
+ radix_tree_preload_end();
+ if (unlikely(error))
+ goto err_insert;
+ mapping->nrpages++;
+ __inc_zone_page_state(page, NR_FILE_PAGES);
+ spin_unlock_irq(&mapping->tree_lock);
+ trace_mm_filemap_add_to_page_cache(page);
+ return 0;
+err_insert:
+ page->mapping = NULL;
+ /* Leave page->index set: truncation relies upon it */
+ spin_unlock_irq(&mapping->tree_lock);
+ mem_cgroup_uncharge_cache_page(page);
+ page_cache_release(page);
return error;
}
EXPORT_SYMBOL(add_to_page_cache_locked);
--
Kirill A. Shutemov
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