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sparc/mm/fault_32.c: Port OOM changes to do_sparc_fault
Commitd065bd810b
(mm: retry page fault when blocking on disk transfer) and commit37b23e0525
(x86,mm: make pagefault killable) The above commits introduced changes into the x86 pagefault handler for making the page fault handler retryable as well as killable. These changes reduce the mmap_sem hold time, which is crucial during OOM killer invocation. Port these changes to 32-bit sparc. Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
7358e51082
commit
c29554f53e
1 changed files with 30 additions and 7 deletions
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@ -225,6 +225,8 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
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unsigned long g2;
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int from_user = !(regs->psr & PSR_PS);
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int fault, code;
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unsigned int flags = (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
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(write ? FAULT_FLAG_WRITE : 0));
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if(text_fault)
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address = regs->pc;
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@ -251,6 +253,7 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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retry:
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down_read(&mm->mmap_sem);
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/*
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@ -289,7 +292,11 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
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* make sure we exit gracefully rather than endlessly redo
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* the fault.
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*/
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fault = handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0);
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fault = handle_mm_fault(mm, vma, address, flags);
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if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
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return;
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if (unlikely(fault & VM_FAULT_ERROR)) {
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if (fault & VM_FAULT_OOM)
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goto out_of_memory;
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@ -297,13 +304,29 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
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goto do_sigbus;
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BUG();
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}
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if (flags & FAULT_FLAG_ALLOW_RETRY) {
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if (fault & VM_FAULT_MAJOR) {
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current->maj_flt++;
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
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1, regs, address);
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} else {
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current->min_flt++;
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
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1, regs, address);
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}
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if (fault & VM_FAULT_RETRY) {
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flags &= ~FAULT_FLAG_ALLOW_RETRY;
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/* No need to up_read(&mm->mmap_sem) as we would
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* have already released it in __lock_page_or_retry
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* in mm/filemap.c.
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*/
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goto retry;
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}
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}
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up_read(&mm->mmap_sem);
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return;
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