csky: add page fault perf event support (0eaf50de) · Commits · 戴 / test

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>

arch/csky/mm/fault.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -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;

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