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csky: add page fault perf event support

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This patch add support for page fault count, major fault count
and minorfault count. Without this patch page faults are not
sampled for perf event.

Performance counter stats for '/usr/lib/perf-test/callchain_test':
	0      page-faults               #    0.000 K/sec

Signed-off-by: Mao Han <han_mao@c-sky.com>
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
This commit is contained in:
Mao Han
2019-04-18 14:20:40 +08:00
committed by Guo Ren
parent 683fafebf9
commit 0eaf50deec
1 changed files with 10 additions and 2 deletions
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12
arch/csky/mm/fault.c
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@@ -17,6 +17,7 @@
#include <linux/vt_kern.h>
#include <linux/extable.h>
#include <linux/uaccess.h>
#include <linux/perf_event.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
@@ -106,6 +107,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
return;
}
#endif
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
/*
* If we're in an interrupt or have no user
* context, we must not take the fault..
@@ -153,10 +156,15 @@ good_area:
goto bad_area;
BUG();
}
if (fault & VM_FAULT_MAJOR)
if (fault & VM_FAULT_MAJOR) {
tsk->maj_flt++;
else
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs,
address);
} else {
tsk->min_flt++;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs,
address);
}
up_read(&mm->mmap_sem);
return;