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Date: Sat, 4 Oct 2014 08:13:36 +0900 From: Mike Hommey <mh@...ndium.org> To: Andrea Arcangeli <aarcange@...hat.com> Cc: qemu-devel@...gnu.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-api@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, Andres Lagar-Cavilla <andreslc@...gle.com>, Dave Hansen <dave@...1.net>, Paolo Bonzini <pbonzini@...hat.com>, Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>, Andy Lutomirski <luto@...capital.net>, Andrew Morton <akpm@...ux-foundation.org>, Sasha Levin <sasha.levin@...cle.com>, Hugh Dickins <hughd@...gle.com>, Peter Feiner <pfeiner@...gle.com>, "\\\"Dr. David Alan Gilbert\\\"" <dgilbert@...hat.com>, Christopher Covington <cov@...eaurora.org>, Johannes Weiner <hannes@...xchg.org>, Android Kernel Team <kernel-team@...roid.com>, Robert Love <rlove@...gle.com>, Dmitry Adamushko <dmitry.adamushko@...il.com>, Neil Brown <neilb@...e.de>, Taras Glek <tglek@...illa.com>, Jan Kara <jack@...e.cz>, KOSAKI Motohiro <kosaki.motohiro@...il.com>, Michel Lespinasse <walken@...gle.com>, Minchan Kim <minchan@...nel.org>, Keith Packard <keithp@...thp.com>, "Huangpeng (Peter)" <peter.huangpeng@...wei.com>, Isaku Yamahata <yamahata@...inux.co.jp>, Anthony Liguori <anthony@...emonkey.ws>, Stefan Hajnoczi <stefanha@...il.com>, Wenchao Xia <wenchaoqemu@...il.com>, Andrew Jones <drjones@...hat.com>, Juan Quintela <quintela@...hat.com> Subject: Re: [PATCH 08/17] mm: madvise MADV_USERFAULT On Fri, Oct 03, 2014 at 07:07:58PM +0200, Andrea Arcangeli wrote: > MADV_USERFAULT is a new madvise flag that will set VM_USERFAULT in the > vma flags. Whenever VM_USERFAULT is set in an anonymous vma, if > userland touches a still unmapped virtual address, a sigbus signal is > sent instead of allocating a new page. The sigbus signal handler will > then resolve the page fault in userland by calling the > remap_anon_pages syscall. What does "unmapped virtual address" mean in this context? Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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