Re: [PATCH v2] mm: thp: Set the accessed flag for old pages on access fault.
From: Will Deacon <hidden>
Date: 2012-10-19 09:10:43
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On Thu, Oct 18, 2012 at 11:05:02PM +0100, Andrew Morton wrote:
On Wed, 17 Oct 2012 16:54:02 +0100 Will Deacon [off-list ref] wrote:quoted
On x86 memory accesses to pages without the ACCESSED flag set result in the ACCESSED flag being set automatically. With the ARM architecture a page access fault is raised instead (and it will continue to be raised until the ACCESSED flag is set for the appropriate PTE/PMD). For normal memory pages, handle_pte_fault will call pte_mkyoung (effectively setting the ACCESSED flag). For transparent huge pages, pmd_mkyoung will only be called for a write fault. This patch ensures that faults on transparent hugepages which do not result in a CoW update the access flags for the faulting pmd.Confused. Where is the arm implementation of update_mmu_cache_pmd()?
Right at the end of this patch, which was posted to the ARM list yesterday: http://lists.infradead.org/pipermail/linux-arm-kernel/2012-October/126387.html Cheers, Will -- 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>