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SubjectRe: [PATCH 1/1] csky: add page fault perf event support
Looks good, nice Job, Maomao

On Thu, Apr 18, 2019 at 02:20:40PM +0800, Mao Han wrote:
> 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>
> ---
> arch/csky/mm/fault.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
> index e1725f8..d07141d 100644
> --- a/arch/csky/mm/fault.c
> +++ b/arch/csky/mm/fault.c
> @@ -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 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
> 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;
> --
> 2.7.4
>

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