From: "Michal Suchánek" <msuchanek@suse.de>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Oliver <oohall@gmail.com>, Jan Kara <jack@suse.cz>,
linux-nvdimm@lists.01.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>, Ross Zwisler <zwisler@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH 2/2] mm/dax: Don't enable huge dax mapping by default
Date: Wed, 6 Mar 2019 12:44:53 +0100 [thread overview]
Message-ID: <20190306124453.126d36d8@naga.suse.cz> (raw)
In-Reply-To: <87k1hc8iqa.fsf@linux.ibm.com>
On Wed, 06 Mar 2019 14:47:33 +0530
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
> Dan Williams <dan.j.williams@intel.com> writes:
>
> > On Thu, Feb 28, 2019 at 1:40 AM Oliver <oohall@gmail.com> wrote:
> >>
> >> On Thu, Feb 28, 2019 at 7:35 PM Aneesh Kumar K.V
> >> <aneesh.kumar@linux.ibm.com> wrote:
> Also even if the user decided to not use THP, by
> echo "never" > transparent_hugepage/enabled , we should continue to map
> dax fault using huge page on platforms that can support huge pages.
Is this a good idea?
This knob is there for a reason. In some situations having huge pages
can severely impact performance of the system (due to host-guest
interaction or whatever) and the ability to really turn off all THP
would be important in those cases, right?
Thanks
Michal
next prev parent reply other threads:[~2019-03-06 11:44 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-28 8:35 [PATCH 1/2] fs/dax: deposit pagetable even when installing zero page Aneesh Kumar K.V
2019-02-28 8:35 ` [PATCH 2/2] mm/dax: Don't enable huge dax mapping by default Aneesh Kumar K.V
2019-02-28 9:40 ` Jan Kara
2019-02-28 12:32 ` Aneesh Kumar K.V
2019-02-28 9:40 ` Oliver
2019-02-28 12:43 ` Aneesh Kumar K.V
2019-02-28 16:45 ` Dan Williams
2019-03-06 9:17 ` Aneesh Kumar K.V
2019-03-06 11:44 ` Michal Suchánek [this message]
2019-03-06 12:45 ` Aneesh Kumar K.V
2019-03-06 13:06 ` Kirill A. Shutemov
2019-03-13 16:07 ` Dan Williams
2019-03-19 8:44 ` Kirill A. Shutemov
2019-03-19 15:36 ` Dan Williams
2019-03-13 16:02 ` Dan Williams
2019-03-14 3:45 ` Aneesh Kumar K.V
2019-03-14 4:02 ` Dan Williams
2019-03-20 8:06 ` Aneesh Kumar K.V
2019-03-20 8:09 ` Aneesh Kumar K.V
2019-03-20 15:34 ` Dan Williams
2019-03-20 20:57 ` Dan Williams
2019-03-21 3:08 ` Oliver
2019-03-21 3:12 ` Dan Williams
2019-02-28 9:21 ` [PATCH 1/2] fs/dax: deposit pagetable even when installing zero page Jan Kara
2019-02-28 12:34 ` Aneesh Kumar K.V
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