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Commit 5be3492f authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
Browse files

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: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 61c03ddb

arch/powerpc/kernel/traps.c

+7 −7
Original line number Diff line number Diff line
@@ -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);

arch/powerpc/xmon/xmon.c

+1 −1
Original line number Diff line number Diff line
@@ -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;