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authorPaul Mundt <lethal@linux-sh.org>2009-06-25 02:30:10 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-06-25 02:30:10 +0900
commit7433ab770327b471399f7b5baacad78e160b5393 (patch)
treeaad14b4baa2f3e39e4116a72244f03c886cdc49e /arch/sh/mm/fault_32.c
parentd94d4adb7dd05b4e25f3c317a1b932ec74272a12 (diff)
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sh: Hook up page fault events for software perf counters.
This adds page fault instrumentation for the software performance counters. Follows the x86 and powerpc changes. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm/fault_32.c')
-rw-r--r--arch/sh/mm/fault_32.c61
1 files changed, 32 insertions, 29 deletions
diff --git a/arch/sh/mm/fault_32.c b/arch/sh/mm/fault_32.c
index cc8ddbdf3d7a..71925946f1e1 100644
--- a/arch/sh/mm/fault_32.c
+++ b/arch/sh/mm/fault_32.c
@@ -15,12 +15,28 @@
#include <linux/mm.h>
#include <linux/hardirq.h>
#include <linux/kprobes.h>
-#include <linux/marker.h>
+#include <linux/perf_counter.h>
#include <asm/io_trapped.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
+{
+ int ret = 0;
+
+#ifdef CONFIG_KPROBES
+ if (!user_mode(regs)) {
+ preempt_disable();
+ if (kprobe_running() && kprobe_fault_handler(regs, trap))
+ ret = 1;
+ preempt_enable();
+ }
+#endif
+
+ return ret;
+}
+
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
@@ -87,13 +103,16 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
return;
}
+ mm = tsk->mm;
+
+ if (unlikely(notify_page_fault(regs, lookup_exception_vector())))
+ return;
+
/* Only enable interrupts if they were on before the fault */
- if ((regs->sr & SR_IMASK) != SR_IMASK) {
- trace_hardirqs_on();
+ if ((regs->sr & SR_IMASK) != SR_IMASK)
local_irq_enable();
- }
- mm = tsk->mm;
+ perf_swcounter_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
/*
* If we're in an interrupt or have no user
@@ -141,10 +160,15 @@ survive:
goto do_sigbus;
BUG();
}
- if (fault & VM_FAULT_MAJOR)
+ if (fault & VM_FAULT_MAJOR) {
tsk->maj_flt++;
- else
+ perf_swcounter_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0,
+ regs, address);
+ } else {
tsk->min_flt++;
+ perf_swcounter_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0,
+ regs, address);
+ }
up_read(&mm->mmap_sem);
return;
@@ -245,22 +269,6 @@ do_sigbus:
goto no_context;
}
-static inline int notify_page_fault(struct pt_regs *regs, int trap)
-{
- int ret = 0;
-
-#ifdef CONFIG_KPROBES
- if (!user_mode(regs)) {
- preempt_disable();
- if (kprobe_running() && kprobe_fault_handler(regs, trap))
- ret = 1;
- preempt_enable();
- }
-#endif
-
- return ret;
-}
-
/*
* Called with interrupts disabled.
*/
@@ -273,12 +281,7 @@ asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs,
pmd_t *pmd;
pte_t *pte;
pte_t entry;
- int ret = 0;
-
- if (notify_page_fault(regs, lookup_exception_vector()))
- goto out;
-
- ret = 1;
+ int ret = 1;
/*
* We don't take page faults for P1, P2, and parts of P4, these