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| Started by | Andrew Morton <akpm@linux-foundation.org> |
|---|---|
| First post | 2017-02-01 01:50 +0100 |
| Last post | 2017-02-01 07:40 +0100 |
| Articles | 2 — 2 participants |
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Re: [PATCH v2 2/5] userfaultfd: non-cooperative: add event for memory unmaps Andrew Morton <akpm@linux-foundation.org> - 2017-02-01 01:50 +0100
Re: [PATCH v2 2/5] userfaultfd: non-cooperative: add event for memory unmaps Mike Rapoport <rppt@linux.vnet.ibm.com> - 2017-02-01 07:40 +0100
| From | Andrew Morton <akpm@linux-foundation.org> |
|---|---|
| Date | 2017-02-01 01:50 +0100 |
| Subject | Re: [PATCH v2 2/5] userfaultfd: non-cooperative: add event for memory unmaps |
| Message-ID | <t5Rhw-7s5-5@gated-at.bofh.it> |
On Fri, 27 Jan 2017 20:44:30 +0200 Mike Rapoport <rppt@linux.vnet.ibm.com> wrote: > When a non-cooperative userfaultfd monitor copies pages in the background, > it may encounter regions that were already unmapped. Addition of > UFFD_EVENT_UNMAP allows the uffd monitor to track precisely changes in the > virtual memory layout. > > Since there might be different uffd contexts for the affected VMAs, we > first should create a temporary representation for the unmap event for each > uffd context and then notify them one by one to the appropriate userfault > file descriptors. > > The event notification occurs after the mmap_sem has been released. I was going to bug you about not updating Documentation/vm/userfaultfd.txt but the UFFD_FEATURE flags aren't documented?
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| From | Mike Rapoport <rppt@linux.vnet.ibm.com> |
|---|---|
| Date | 2017-02-01 07:40 +0100 |
| Message-ID | <t5WKd-2n7-5@gated-at.bofh.it> |
| In reply to | #1571225 |
On Tue, Jan 31, 2017 at 04:39:28PM -0800, Andrew Morton wrote: > On Fri, 27 Jan 2017 20:44:30 +0200 Mike Rapoport <rppt@linux.vnet.ibm.com> wrote: > > > When a non-cooperative userfaultfd monitor copies pages in the background, > > it may encounter regions that were already unmapped. Addition of > > UFFD_EVENT_UNMAP allows the uffd monitor to track precisely changes in the > > virtual memory layout. > > > > Since there might be different uffd contexts for the affected VMAs, we > > first should create a temporary representation for the unmap event for each > > uffd context and then notify them one by one to the appropriate userfault > > file descriptors. > > > > The event notification occurs after the mmap_sem has been released. > > I was going to bug you about not updating > Documentation/vm/userfaultfd.txt but the UFFD_FEATURE flags aren't > documented? I'm going to send the documentation update in the next few days. -- Sincerely yours, Mike.
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