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powerpc: Mark some variables in the page fault path __read_mostly 

Using perf to trace L1 dcache misses and dumping data addresses I found a few
variables taking a lot of misses. Since they are almost never written, they
should go into the __read_mostly section.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-01-12 00:50:14 +00:00 committed by Benjamin Herrenschmidt
parent 61c03ddbdf
commit 5be3492f97
2 changed files with 8 additions and 8 deletions
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14
arch/powerpc/kernel/traps.c
View File

@ -60,13 +60,13 @@
#endif
#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
int (*__debugger)(struct pt_regs *regs);
int (*__debugger_ipi)(struct pt_regs *regs);
int (*__debugger_bpt)(struct pt_regs *regs);
int (*__debugger_sstep)(struct pt_regs *regs);
int (*__debugger_iabr_match)(struct pt_regs *regs);
int (*__debugger_dabr_match)(struct pt_regs *regs);
int (*__debugger_fault_handler)(struct pt_regs *regs);
int (*__debugger)(struct pt_regs *regs) __read_mostly;
int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly;
int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly;
int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly;
int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly;
int (*__debugger_dabr_match)(struct pt_regs *regs) __read_mostly;
int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly;
EXPORT_SYMBOL(__debugger);
EXPORT_SYMBOL(__debugger_ipi);

2
arch/powerpc/xmon/xmon.c
View File

@ -61,7 +61,7 @@ static int xmon_owner;
static int xmon_gate;
#endif /* CONFIG_SMP */
static unsigned long in_xmon = 0;
static unsigned long in_xmon __read_mostly = 0;
static unsigned long adrs;
static int size = 1;