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Date: Wed, 12 Nov 2008 13:45:12 +0100 (CET)
From: Andi Kleen <andi@...stfloor.org>
To: mingo@...e.hu, linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH] [4/4] SCHED: Use a lookup array in sd_level_to_string
Generates better/shorter code. Doesn't matter much because it's only
a SCHED_DEBUG function.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
kernel/sched.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)
Index: linux-2.6.28-rc4-test/kernel/sched.c
===================================================================
--- linux-2.6.28-rc4-test.orig/kernel/sched.c 2008-11-12 12:36:23.000000000 +0100
+++ linux-2.6.28-rc4-test/kernel/sched.c 2008-11-12 12:43:58.000000000 +0100
@@ -6629,24 +6629,17 @@
static inline const char *sd_level_to_string(enum sched_domain_level lvl)
{
- switch (lvl) {
- case SD_LV_NONE:
- return "NONE";
- case SD_LV_SIBLING:
- return "SIBLING";
- case SD_LV_MC:
- return "MC";
- case SD_LV_CPU:
- return "CPU";
- case SD_LV_NODE:
- return "NODE";
- case SD_LV_ALLNODES:
- return "ALLNODES";
- case SD_LV_MAX:
- return "MAX";
-
- }
- return "MAX";
+ static const char *lva[] = {
+#define T(x) [SD_LV_ ## x ] = #T
+ T(NONE),
+ T(SIBLING),
+ T(MC),
+ T(CPU),
+ T(NODE),
+ T(ALLNODES),
+#undef T
+ };
+ return (unsigned)lvl < ARRAY_SIZE(lva) ? lva[lvl] : "MAX";
}
static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
--
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