From: Matt Mackall <mpm@selenic.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH 5/8] base-small: shrink UID hash
Date: Mon, 31 Jan 2005 01:25:52 -0600 [thread overview]
Message-ID: <6.687457650@selenic.com> (raw)
In-Reply-To: <5.687457650@selenic.com>
CONFIG_BASE_SMALL reduce UID lookup hash
Signed-off-by: Matt Mackall <mpm@selenic.com>
Index: tq/kernel/user.c
===================================================================
--- tq.orig/kernel/user.c 2005-01-25 09:31:58.000000000 -0800
+++ tq/kernel/user.c 2005-01-26 13:11:10.000000000 -0800
@@ -18,7 +18,8 @@
* UID task count cache, to get fast user lookup in "alloc_uid"
* when changing user ID's (ie setuid() and friends).
*/
-#define UIDHASH_BITS 8
+
+#define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8)
#define UIDHASH_SZ (1 << UIDHASH_BITS)
#define UIDHASH_MASK (UIDHASH_SZ - 1)
#define __uidhashfn(uid) (((uid >> UIDHASH_BITS) + uid) & UIDHASH_MASK)
next prev parent reply other threads:[~2005-01-31 7:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-31 7:25 [PATCH 0/8] base-small: CONFIG_BASE_SMALL for small systems Matt Mackall
2005-01-31 7:25 ` [PATCH 1/8] base-small: introduce the CONFIG_BASE_SMALL flag Matt Mackall
2005-01-31 7:25 ` [PATCH 2/8] base-small: shrink major_names hash Matt Mackall
2005-01-31 7:25 ` [PATCH 3/8] base-small: shrink chrdevs hash Matt Mackall
2005-01-31 7:25 ` [PATCH 4/8] base-small: shrink PID tables Matt Mackall
2005-01-31 7:25 ` Matt Mackall [this message]
2005-01-31 7:25 ` [PATCH 6/8] base-small: shrink futex queues Matt Mackall
2005-01-31 7:25 ` [PATCH 7/8] base-small: shrink timer hashes Matt Mackall
2005-01-31 7:25 ` [PATCH 8/8] base-small: shrink console buffer Matt Mackall
2005-02-01 0:55 ` [PATCH 0/8] base-small: CONFIG_BASE_SMALL for small systems Horst von Brand
2005-02-01 4:18 ` Matt Mackall
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