From: Mike Kravetz <mike.kravetz@oracle.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Pavel Emelyanov <xemul@parallels.com>,
zhang.zhanghailiang@huawei.com,
Dave Hansen <dave.hansen@intel.com>,
Rik van Riel <riel@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Huangpeng (Peter)" <peter.huangpeng@huawei.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Bamvor Zhang Jian <bamvor.zhangjian@linaro.org>,
Bharata B Rao <bharata@linux.vnet.ibm.com>,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH 00/12] userfaultfd non-x86 and selftest updates for 4.2.0+
Date: Wed, 30 Sep 2015 14:56:19 -0700 [thread overview]
Message-ID: <560C5A83.9080103@oracle.com> (raw)
In-Reply-To: <1441745010-14314-1-git-send-email-aarcange@redhat.com>
On 09/08/2015 01:43 PM, Andrea Arcangeli wrote:
> Here are some pending updates for userfaultfd mostly to the self test,
> the rest are cleanups.
I have a potential use case for userfualtfd. So, I started experimenting
with the self test code. I replaced the posix_memalign() calls to allocate
area_src and area_dst with mmap(). mmap(MAP_PRIVATE | MAP_ANONYMOUS) works
as expected. However, mmap(MAP_SHARED | MAP_ANONYMOUS) causes the test to
fail without any errros from the userfaultfd APIs.
--------------------
running userfaultfd
--------------------
nr_pages: 32768, nr_pages_per_cpu: 8192
bounces: 31, mode: rnd racing ver poll, page_nr 31523 wrong count 0 1
I would expect some type of error from the ioctl() that registers the
range, or perhaps the poll/copy code? Just curious about the expected
behavior.
FYI - My use case is for hugetlbfs. I would like a mechanism to catch all
new huge page allocations as a result of page faults. I have some very
rough code to extend userfualtfd and add the required functionality to
hugetlbfs. Still working on it.
--
Mike Kravetz
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next prev parent reply other threads:[~2015-09-30 21:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-08 20:43 [PATCH 00/12] userfaultfd non-x86 and selftest updates for 4.2.0+ Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 01/12] userfaultfd: selftest: update userfaultfd x86 32bit syscall number Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 02/12] userfaultfd: Revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key" Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 03/12] userfaultfd: selftests: vm: pick up sanitized kernel headers Andrea Arcangeli
2015-09-09 2:48 ` Michael Ellerman
2015-09-08 20:43 ` [PATCH 04/12] userfaultfd: selftest: headers fixup Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 05/12] userfaultfd: selftest: only warn if __NR_userfaultfd is undefined Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 06/12] userfaultfd: selftest: avoid my_bcmp false positives with powerpc Andrea Arcangeli
2015-09-09 2:50 ` Michael Ellerman
2015-09-09 17:02 ` Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 07/12] userfaultfd: selftest: Fix compiler warnings on 32-bit Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 08/12] userfaultfd: selftest: return an error if BOUNCE_VERIFY fails Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 09/12] userfaultfd: selftest: don't error out if pthread_mutex_t isn't identical Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 10/12] userfaultfd: powerpc: Bump up __NR_syscalls to account for __NR_userfaultfd Andrea Arcangeli
2015-09-09 2:48 ` Michael Ellerman
2015-09-08 20:43 ` [PATCH 11/12] userfaultfd: powerpc: implement syscall Andrea Arcangeli
2015-09-08 20:43 ` [PATCH 12/12] userfaultfd: register uapi generic syscall (aarch64) Andrea Arcangeli
2015-09-15 20:02 ` Andrew Morton
2015-09-15 20:20 ` Mathieu Desnoyers
2015-09-15 20:47 ` Andrea Arcangeli
2015-09-30 21:56 ` Mike Kravetz [this message]
2015-10-01 0:06 ` [PATCH 00/12] userfaultfd non-x86 and selftest updates for 4.2.0+ Andrea Arcangeli
2015-10-01 0:42 ` Mike Kravetz
2015-10-01 16:04 ` Andrea Arcangeli
2015-10-01 16:45 ` Mike Kravetz
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