From: Aaron Lu <aaron.lu@intel.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"Paweł Staszewski" <pstaszewski@itcare.pl>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Eric Dumazet" <eric.dumazet@gmail.com>,
"Tariq Toukan" <tariqt@mellanox.com>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
"Yoel Caspersen" <yoel@kviknet.dk>,
"Mel Gorman" <mgorman@techsingularity.net>,
"Saeed Mahameed" <saeedm@mellanox.com>,
"Michal Hocko" <mhocko@suse.com>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Alexander Duyck" <alexander.h.duyck@linux.intel.com>
Subject: [PATCH v2 2/2] mm/page_alloc: use a single function to free page
Date: Tue, 6 Nov 2018 13:30:37 +0800 [thread overview]
Message-ID: <20181106053037.GD6203@intel.com> (raw)
In-Reply-To: <20181105085820.6341-2-aaron.lu@intel.com>
We have multiple places of freeing a page, most of them doing similar
things and a common function can be used to reduce code duplicate.
It also avoids bug fixed in one function but left in another.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
---
v2: move comments close to code as suggested by Dave.
mm/page_alloc.c | 36 ++++++++++++++++--------------------
1 file changed, 16 insertions(+), 20 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 91a9a6af41a2..4faf6b7bf225 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4425,9 +4425,17 @@ unsigned long get_zeroed_page(gfp_t gfp_mask)
}
EXPORT_SYMBOL(get_zeroed_page);
-void __free_pages(struct page *page, unsigned int order)
+static inline void free_the_page(struct page *page, unsigned int order, int nr)
{
- if (put_page_testzero(page)) {
+ VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
+
+ /*
+ * Free a page by reducing its ref count by @nr.
+ * If its refcount reaches 0, then according to its order:
+ * order0: send to PCP;
+ * high order: directly send to Buddy.
+ */
+ if (page_ref_sub_and_test(page, nr)) {
if (order == 0)
free_unref_page(page);
else
@@ -4435,6 +4443,10 @@ void __free_pages(struct page *page, unsigned int order)
}
}
+void __free_pages(struct page *page, unsigned int order)
+{
+ free_the_page(page, order, 1);
+}
EXPORT_SYMBOL(__free_pages);
void free_pages(unsigned long addr, unsigned int order)
@@ -4481,16 +4493,7 @@ static struct page *__page_frag_cache_refill(struct page_frag_cache *nc,
void __page_frag_cache_drain(struct page *page, unsigned int count)
{
- VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
-
- if (page_ref_sub_and_test(page, count)) {
- unsigned int order = compound_order(page);
-
- if (order == 0)
- free_unref_page(page);
- else
- __free_pages_ok(page, order);
- }
+ free_the_page(page, compound_order(page), count);
}
EXPORT_SYMBOL(__page_frag_cache_drain);
@@ -4555,14 +4558,7 @@ void page_frag_free(void *addr)
{
struct page *page = virt_to_head_page(addr);
- if (unlikely(put_page_testzero(page))) {
- unsigned int order = compound_order(page);
-
- if (order == 0)
- free_unref_page(page);
- else
- __free_pages_ok(page, order);
- }
+ free_the_page(page, compound_order(page), 1);
}
EXPORT_SYMBOL(page_frag_free);
--
2.17.2
next prev parent reply other threads:[~2018-11-06 5:30 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-05 8:58 [PATCH 1/2] mm/page_alloc: free order-0 pages through PCP in page_frag_free() Aaron Lu
2018-11-05 8:58 ` [PATCH 2/2] mm/page_alloc: use a single function to free page Aaron Lu
2018-11-05 16:39 ` Dave Hansen
2018-11-06 5:30 ` Aaron Lu [this message]
2018-11-06 8:16 ` [PATCH v2 " Vlastimil Babka
2018-11-06 8:47 ` Aaron Lu
2018-11-06 9:32 ` Vlastimil Babka
2018-11-06 11:20 ` Aaron Lu
2018-11-06 11:31 ` [PATCH v3 " Aaron Lu
2018-11-06 12:06 ` Vlastimil Babka
2018-11-05 9:26 ` [PATCH 1/2] mm/page_alloc: free order-0 pages through PCP in page_frag_free() Vlastimil Babka
2018-11-05 9:26 ` Mel Gorman
2018-11-05 9:55 ` Jesper Dangaard Brouer
2018-11-05 10:46 ` Ilias Apalodimas
2018-11-05 15:44 ` Alexander Duyck
2018-11-10 23:54 ` Paweł Staszewski
2018-11-11 23:05 ` Alexander Duyck
2018-11-12 0:39 ` Paweł Staszewski
2018-11-12 15:30 ` Alexander Duyck
2018-11-12 15:44 ` Eric Dumazet
2018-11-12 17:06 ` Paweł Staszewski
2018-11-12 17:01 ` Paweł Staszewski
2018-11-05 16:37 ` Dave Hansen
2018-11-06 5:28 ` [PATCH v2 " Aaron Lu
2018-11-07 9:59 ` Tariq Toukan
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