netdev - [PATCH v2 5/8] page_frag_cache: Save memory on small machines

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Message-Id: <20180322153157.10447-6-willy@infradead.org>
Date:   Thu, 22 Mar 2018 08:31:54 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>, netdev@...r.kernel.org,
        linux-mm@...ck.org, Jesper Dangaard Brouer <brouer@...hat.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v2 5/8] page_frag_cache: Save memory on small machines

From: Matthew Wilcox <mawilcox@...rosoft.com>

Only allocate a single page if CONFIG_BASE_SMALL is set.

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 include/linux/mm_types.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index a63b138ad1a4..0defff9e3c0e 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -216,7 +216,11 @@ struct page {
 #endif
 } _struct_page_alignment;
 
+#if CONFIG_BASE_SMALL
+#define PAGE_FRAG_CACHE_MAX_SIZE	PAGE_SIZE
+#else
 #define PAGE_FRAG_CACHE_MAX_SIZE	__ALIGN_MASK(32768, ~PAGE_MASK)
+#endif
 #define PAGE_FRAG_CACHE_MAX_ORDER	get_order(PAGE_FRAG_CACHE_MAX_SIZE)
 #define PFC_MEMALLOC			(1U << 31)
 
-- 
2.16.2