From: Daniel Colascione <dancol@google.com>
To: Joel Fernandes <joel@joelfernandes.org>
Cc: David Miller <davem@davemloft.net>,
kirill@shutemov.name, linux-kernel <linux-kernel@vger.kernel.org>,
kernel-team@android.com, Minchan Kim <minchan@kernel.org>,
Ramon Pantin <pantin@google.com>,
hughd@google.com, Lokesh Gidra <lokeshgidra@google.com>,
Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
aryabinin@virtuozzo.com, luto@kernel.org, bp@alien8.de,
catalin.marinas@arm.com, chris@zankel.net,
dave.hansen@linux.intel.com, elfring@users.sourceforge.net,
fenghua.yu@intel.com, geert@linux-m68k.org, gxt@pku.edu.cn,
deller@gmx.de, mingo@redhat.com, jejb@parisc-linux.org,
jdike@addtoit.com, jonas@southpole.se, Julia.Lawall@lip6.fr,
kasan-dev@googlegroups.com, kvmarm@lists.cs.columbia.edu,
lftan@altera.com, linux-alpha@vger.kernel.org,
linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-m68k@lists.linux-m68k.org, linux-mips@linux-mips.org,
linux-mm <linux-mm@kvack.org>,
linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org,
linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org,
jcmvbkbc@gmail.com, nios2-dev@lists.rocketboards.org,
Peter Zijlstra <peterz@infradead.org>,
richard@nod.at
Subject: Re: [PATCH v2 2/2] mm: speed up mremap by 500x on large regions
Date: Fri, 12 Oct 2018 18:54:33 -0700 [thread overview]
Message-ID: <CAKOZues25aaKz3_AiyfJ=r2QBd5MghgY3ky_ptg4Z8=ST4DCgw@mail.gmail.com> (raw)
In-Reply-To: <20181013014429.GB207108@joelaf.mtv.corp.google.com>
I wonder whether it makes sense to expose to userspace somehow whether
mremap is "fast" for a particular architecture. If a feature relies on
fast mremap, it might be better for some userland component to disable
that feature entirely rather than blindly use mremap and end up
performing very poorly. If we're disabling fast mremap when THP is
enabled, the userland component can't just rely on an architecture
switch and some kind of runtime feature detection becomes even more
important.
On Fri, Oct 12, 2018 at 6:44 PM, Joel Fernandes <joel@joelfernandes.org> wrote:
> On Fri, Oct 12, 2018 at 06:39:45PM -0700, Daniel Colascione wrote:
>> Not 32-bit ARM?
>
> Well, I didn't want to enable every possible architecture we could in a
> single go. Certainly arm32 can be a follow on enablement as can be other
> architectures. The point of this series is to upstream this feature and
> enable a hand-picked few architectures as a first step.
>
> thanks,
>
> - Joel
>
next prev parent reply other threads:[~2018-10-13 1:54 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-12 1:37 [PATCH v2 1/2] treewide: remove unused address argument from pte_alloc functions Joel Fernandes (Google)
2018-10-12 1:37 ` [PATCH v2 2/2] mm: speed up mremap by 500x on large regions Joel Fernandes (Google)
2018-10-12 11:30 ` Kirill A. Shutemov
2018-10-12 11:36 ` Kirill A. Shutemov
2018-10-12 12:50 ` Joel Fernandes
2018-10-12 13:19 ` Kirill A. Shutemov
2018-10-12 16:57 ` Joel Fernandes
2018-10-12 21:33 ` Kirill A. Shutemov
2018-10-12 18:18 ` David Miller
2018-10-13 1:35 ` Joel Fernandes
2018-10-13 1:39 ` Daniel Colascione
2018-10-13 1:44 ` Joel Fernandes
2018-10-13 1:54 ` Daniel Colascione [this message]
2018-10-13 2:10 ` Joel Fernandes
2018-10-13 2:25 ` Daniel Colascione
2018-10-13 17:50 ` Joel Fernandes
2018-10-12 18:02 ` David Miller
2018-10-12 14:09 ` Anton Ivanov
2018-10-12 14:37 ` Kirill A. Shutemov
2018-10-12 14:48 ` Anton Ivanov
2018-10-12 16:42 ` Anton Ivanov
2018-10-12 16:50 ` Joel Fernandes
2018-10-12 16:58 ` Anton Ivanov
2018-10-12 17:06 ` Joel Fernandes
2018-10-12 21:40 ` Kirill A. Shutemov
2018-10-13 6:10 ` Anton Ivanov
2018-10-15 7:10 ` Christian Borntraeger
2018-10-15 8:18 ` Martin Schwidefsky
2018-10-16 2:08 ` Joel Fernandes
2018-10-12 11:09 ` [PATCH v2 1/2] treewide: remove unused address argument from pte_alloc functions Kirill A. Shutemov
2018-10-12 16:37 ` Joel Fernandes
2018-10-12 13:56 ` Anton Ivanov
2018-10-12 16:34 ` Joel Fernandes
2018-10-12 16:38 ` Julia Lawall
2018-10-12 16:46 ` Joel Fernandes
2018-10-12 18:51 ` SF Markus Elfring
2018-10-12 19:42 ` Joel Fernandes
2018-10-13 9:22 ` SF Markus Elfring
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