From: Laurent Dufour <ldufour@linux.vnet.ibm.com> To: paulmck@linux.vnet.ibm.com, peterz@infradead.org, akpm@linux-foundation.org, kirill@shutemov.name, ak@linux.intel.com, mhocko@kernel.org, dave@stgolabs.net, jack@suse.cz Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, haren@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com, npiggin@gmail.com, bsingharora@gmail.com Subject: [RFC v3 14/17] x86/mm: Update the handle_speculative_fault's path Date: Thu, 27 Apr 2017 17:52:53 +0200 [thread overview] Message-ID: <1493308376-23851-15-git-send-email-ldufour@linux.vnet.ibm.com> (raw) In-Reply-To: <1493308376-23851-1-git-send-email-ldufour@linux.vnet.ibm.com> If handle_speculative_fault failed due to a VM ERROR, we try again the slow path to allow the signal to be delivered. Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> --- arch/x86/mm/fault.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index ee6d8799d958..8f3bd8a53d66 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -1320,10 +1320,14 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code, fault = handle_speculative_fault(mm, address, flags & ~FAULT_FLAG_ALLOW_RETRY); - if (fault & VM_FAULT_RETRY) - goto retry; - - goto done; + /* + * We also check against VM_FAULT_ERROR because we have to + * raise a signal by calling later mm_fault_error() which + * requires the vma pointer to be set. So in that case, + * we fall through the normal path. + */ + if (!(fault & VM_FAULT_RETRY || fault & VM_FAULT_ERROR)) + goto done; } /* @@ -1429,20 +1433,13 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code, return; } - if (unlikely(fault & VM_FAULT_RETRY)) { - if (fatal_signal_pending(current)) - return; - - goto done; - } - up_read(&mm->mmap_sem); -done: if (unlikely(fault & VM_FAULT_ERROR)) { mm_fault_error(regs, error_code, address, vma, fault); return; } +done: /* * Major/minor page fault accounting. If any of the events * returned VM_FAULT_MAJOR, we account it as a major fault. -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Laurent Dufour <ldufour@linux.vnet.ibm.com> To: paulmck@linux.vnet.ibm.com, peterz@infradead.org, akpm@linux-foundation.org, kirill@shutemov.name, ak@linux.intel.com, mhocko@kernel.org, dave@stgolabs.net, jack@suse.cz Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, haren@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com, npiggin@gmail.com, bsingharora@gmail.com Subject: [RFC v3 14/17] x86/mm: Update the handle_speculative_fault's path Date: Thu, 27 Apr 2017 17:52:53 +0200 [thread overview] Message-ID: <1493308376-23851-15-git-send-email-ldufour@linux.vnet.ibm.com> (raw) In-Reply-To: <1493308376-23851-1-git-send-email-ldufour@linux.vnet.ibm.com> If handle_speculative_fault failed due to a VM ERROR, we try again the slow path to allow the signal to be delivered. Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> --- arch/x86/mm/fault.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index ee6d8799d958..8f3bd8a53d66 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -1320,10 +1320,14 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code, fault = handle_speculative_fault(mm, address, flags & ~FAULT_FLAG_ALLOW_RETRY); - if (fault & VM_FAULT_RETRY) - goto retry; - - goto done; + /* + * We also check against VM_FAULT_ERROR because we have to + * raise a signal by calling later mm_fault_error() which + * requires the vma pointer to be set. So in that case, + * we fall through the normal path. + */ + if (!(fault & VM_FAULT_RETRY || fault & VM_FAULT_ERROR)) + goto done; } /* @@ -1429,20 +1433,13 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code, return; } - if (unlikely(fault & VM_FAULT_RETRY)) { - if (fatal_signal_pending(current)) - return; - - goto done; - } - up_read(&mm->mmap_sem); -done: if (unlikely(fault & VM_FAULT_ERROR)) { mm_fault_error(regs, error_code, address, vma, fault); return; } +done: /* * Major/minor page fault accounting. If any of the events * returned VM_FAULT_MAJOR, we account it as a major fault. -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-04-27 15:53 UTC|newest] Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-27 15:52 [RFC v3 00/17] Speculative page faults Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 01/17] mm: Dont assume page-table invariance during faults Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 02/17] mm: Prepare for FAULT_FLAG_SPECULATIVE Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 03/17] mm: Introduce pte_spinlock Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-30 4:47 ` Matthew Wilcox 2017-04-30 4:47 ` Matthew Wilcox 2017-05-03 13:01 ` Laurent Dufour 2017-05-03 13:01 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 04/17] mm: VMA sequence count Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 05/17] RCU free VMAs Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 18:28 ` Paul E. McKenney 2017-04-27 18:28 ` Paul E. McKenney 2017-04-30 4:57 ` Matthew Wilcox 2017-04-30 4:57 ` Matthew Wilcox 2017-04-30 5:05 ` Matthew Wilcox 2017-04-30 5:05 ` Matthew Wilcox 2017-05-03 7:23 ` Laurent Dufour 2017-05-03 7:23 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 06/17] mm: Provide speculative fault infrastructure Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 07/17] mm,x86: Add speculative pagefault handling Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 08/17] mm/spf: Try spin lock in speculative path Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 09/17] mm/spf: Fix fe.sequence init in __handle_mm_fault() Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 10/17] mm/spf: don't set fault entry's fields if locking failed Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 11/17] mm/spf; fix lock dependency against mapping->i_mmap_rwsem Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 12/17] mm/spf: Protect changes to vm_flags Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 13/17] mm/spf Protect vm_policy's changes against speculative pf Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour [this message] 2017-04-27 15:52 ` [RFC v3 14/17] x86/mm: Update the handle_speculative_fault's path Laurent Dufour 2017-04-27 15:52 ` [RFC v3 15/17] mm/spf: Add check on the VMA's flags Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 16/17] mm: protect madvise vs speculative pf Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour 2017-04-27 15:52 ` [RFC v3 17/17] mm/spf: protect mremap() against " Laurent Dufour 2017-04-27 15:52 ` Laurent Dufour
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