From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Will Deacon <will.deacon@arm.com>
Cc: kirill.shutemov@linux.intel.com, oleg@redhat.com, hpa@zytor.com,
luto@amacapital.net, dave.hansen@linux.intel.com, mingo@elte.hu,
minchan@kernel.org, tglx@linutronix.de, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: RE: LTP regressions due to 6dc296e7df4c ("mm: make sure all file VMAs have ->vm_ops set")
Date: Mon, 14 Sep 2015 14:57:59 +0300 (EEST) [thread overview]
Message-ID: <20150914115800.06242CE@black.fi.intel.com> (raw)
In-Reply-To: <20150914105346.GB23878@arm.com>
Will Deacon wrote:
> Hi Kirill,
>
> Your patch 6dc296e7df4c ("mm: make sure all file VMAs have ->vm_ops set")
> causes some mmap regressions in LTP, which appears to use a MAP_PRIVATE
> mmap of /dev/zero as a way to get anonymous pages in some of its tests
> (specifically mmap10 [1]).
>
> Dead simple reproducer below. Is this change in behaviour intentional?
Ouch. Of couse it's a bug.
Fix is below. I don't really like it, but I cannot find any better
solution.
next prev parent reply other threads:[~2015-09-14 11:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-14 10:53 LTP regressions due to 6dc296e7df4c ("mm: make sure all file VMAs have ->vm_ops set") Will Deacon
2015-09-14 11:57 ` Kirill A. Shutemov [this message]
2015-09-14 13:22 ` Will Deacon
2015-09-14 17:05 ` Oleg Nesterov
2015-09-14 17:46 ` Oleg Nesterov
2015-09-14 18:20 ` Kirill A. Shutemov
2015-09-15 12:12 ` Oleg Nesterov
2015-09-15 13:42 ` Kirill A. Shutemov
2015-09-15 15:13 ` Oleg Nesterov
2015-09-16 21:28 ` Andrew Morton
2015-09-17 15:37 ` Kirill A. Shutemov
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