netdev - [PATCH 02/24] net, diet: Reduce NAPI hash table for CONFIG_BASE

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Date:	Mon,  5 May 2014 15:25:51 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, tom.zanussi@...ux.intel.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 02/24] net, diet: Reduce NAPI hash table for CONFIG_BASE_SMALL

From: Andi Kleen <ak@...ux.intel.com>

For really small kernels, use only 3 bits for the hash table.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 net/core/dev.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index d2c8a06..c6cbe69 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -175,7 +175,14 @@ EXPORT_SYMBOL(dev_base_lock);
 static DEFINE_SPINLOCK(napi_hash_lock);
 
 static unsigned int napi_gen_id;
-static DEFINE_HASHTABLE(napi_hash, 8);
+
+#ifdef CONFIG_BASE_SMALL
+#define NAPI_HASH_BITS 3
+#else
+#define NAPI_HASH_BITS 8
+#endif
+
+static DEFINE_HASHTABLE(napi_hash, NAPI_HASH_BITS);
 
 static seqcount_t devnet_rename_seq;
 
-- 
1.9.0

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