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csky: add page fault perf event support 

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>
hifive-unleashed-5.2
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;