* [PATCH 20/25] mm/sh: Use mm_fault_accounting() [not found] <20200615221607.7764-1-peterx@redhat.com> @ 2020-06-15 22:23 ` Peter Xu 2020-07-20 21:25 ` Rich Felker 0 siblings, 1 reply; 3+ messages in thread From: Peter Xu @ 2020-06-15 22:23 UTC (permalink / raw) To: linux-kernel Cc: Peter Xu, Gerald Schaefer, Andrew Morton, Linus Torvalds, Andrea Arcangeli, Yoshinori Sato, Rich Felker, linux-sh Use the new mm_fault_accounting() helper for page fault accounting. Avoid doing page fault accounting multiple times if the page fault is retried. CC: Yoshinori Sato <ysato@users.sourceforge.jp> CC: Rich Felker <dalias@libc.org> CC: linux-sh@vger.kernel.org Signed-off-by: Peter Xu <peterx@redhat.com> --- arch/sh/mm/fault.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c index 5f23d7907597..06b232973488 100644 --- a/arch/sh/mm/fault.c +++ b/arch/sh/mm/fault.c @@ -379,7 +379,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, struct task_struct *tsk; struct mm_struct *mm; struct vm_area_struct * vma; - vm_fault_t fault; + vm_fault_t fault, major = 0; unsigned int flags = FAULT_FLAG_DEFAULT; tsk = current; @@ -412,8 +412,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, if ((regs->sr & SR_IMASK) != SR_IMASK) local_irq_enable(); - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); - /* * If we're in an interrupt, have no user context or are running * with pagefaults disabled then we must not take the fault: @@ -465,21 +463,13 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, * the fault. */ fault = handle_mm_fault(vma, address, flags); + major |= fault & VM_FAULT_MAJOR; if (unlikely(fault & (VM_FAULT_RETRY | VM_FAULT_ERROR))) if (mm_fault_error(regs, error_code, address, fault)) return; if (flags & FAULT_FLAG_ALLOW_RETRY) { - if (fault & VM_FAULT_MAJOR) { - tsk->maj_flt++; - 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); - } if (fault & VM_FAULT_RETRY) { flags |= FAULT_FLAG_TRIED; @@ -493,4 +483,5 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, } up_read(&mm->mmap_sem); + mm_fault_accounting(tsk, regs, address, major); } -- 2.26.2 ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH 20/25] mm/sh: Use mm_fault_accounting() 2020-06-15 22:23 ` [PATCH 20/25] mm/sh: Use mm_fault_accounting() Peter Xu @ 2020-07-20 21:25 ` Rich Felker 2020-07-20 22:05 ` Peter Xu 0 siblings, 1 reply; 3+ messages in thread From: Rich Felker @ 2020-07-20 21:25 UTC (permalink / raw) To: Peter Xu Cc: linux-kernel, Gerald Schaefer, Andrew Morton, Linus Torvalds, Andrea Arcangeli, Yoshinori Sato, linux-sh On Mon, Jun 15, 2020 at 06:23:06PM -0400, Peter Xu wrote: > Use the new mm_fault_accounting() helper for page fault accounting. > > Avoid doing page fault accounting multiple times if the page fault is retried. > > CC: Yoshinori Sato <ysato@users.sourceforge.jp> > CC: Rich Felker <dalias@libc.org> > CC: linux-sh@vger.kernel.org > Signed-off-by: Peter Xu <peterx@redhat.com> > --- > arch/sh/mm/fault.c | 15 +++------------ > 1 file changed, 3 insertions(+), 12 deletions(-) > > diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c > index 5f23d7907597..06b232973488 100644 > --- a/arch/sh/mm/fault.c > +++ b/arch/sh/mm/fault.c > @@ -379,7 +379,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, > struct task_struct *tsk; > struct mm_struct *mm; > struct vm_area_struct * vma; > - vm_fault_t fault; > + vm_fault_t fault, major = 0; > unsigned int flags = FAULT_FLAG_DEFAULT; > > tsk = current; > @@ -412,8 +412,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, > if ((regs->sr & SR_IMASK) != SR_IMASK) > local_irq_enable(); > > - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); > - > /* > * If we're in an interrupt, have no user context or are running > * with pagefaults disabled then we must not take the fault: > @@ -465,21 +463,13 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, > * the fault. > */ > fault = handle_mm_fault(vma, address, flags); > + major |= fault & VM_FAULT_MAJOR; > > if (unlikely(fault & (VM_FAULT_RETRY | VM_FAULT_ERROR))) > if (mm_fault_error(regs, error_code, address, fault)) > return; > > if (flags & FAULT_FLAG_ALLOW_RETRY) { > - if (fault & VM_FAULT_MAJOR) { > - tsk->maj_flt++; > - 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); > - } > if (fault & VM_FAULT_RETRY) { > flags |= FAULT_FLAG_TRIED; > > @@ -493,4 +483,5 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, > } > > up_read(&mm->mmap_sem); > + mm_fault_accounting(tsk, regs, address, major); > } > -- > 2.26.2 What's the status on the rest of this series? Do you need any action from my side (arch/sh) at this time? Rich ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH 20/25] mm/sh: Use mm_fault_accounting() 2020-07-20 21:25 ` Rich Felker @ 2020-07-20 22:05 ` Peter Xu 0 siblings, 0 replies; 3+ messages in thread From: Peter Xu @ 2020-07-20 22:05 UTC (permalink / raw) To: Rich Felker Cc: linux-kernel, Gerald Schaefer, Andrew Morton, Linus Torvalds, Andrea Arcangeli, Yoshinori Sato, linux-sh Hi, Rich, On Mon, Jul 20, 2020 at 05:25:24PM -0400, Rich Felker wrote: > What's the status on the rest of this series? Do you need any action > from my side (arch/sh) at this time? This series should have been queued by Andrew in -next. So iiuc no further action is needed. Thanks for asking, -- Peter Xu ^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-06-15 22:23 ` [PATCH 20/25] mm/sh: Use mm_fault_accounting() Peter Xu
2020-07-20 21:25 ` Rich Felker
2020-07-20 22:05 ` Peter Xu
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