From: Michal Hocko <mhocko@kernel.org>
To: "Harrosh, Boaz" <Boaz.Harrosh@netapp.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Mike Kravetz <mike.kravetz@oracle.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Hugh Dickins <hughd@google.com>,
Dan Williams <dan.j.williams@intel.com>,
Matthew Wilcox <willy@infradead.org>,
Toshi Kani <toshi.kani@hpe.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH] mm: align anon mmap for THP
Date: Mon, 14 Jan 2019 19:02:30 +0100 [thread overview]
Message-ID: <20190114180230.GN21345@dhcp22.suse.cz> (raw)
In-Reply-To: <MWHPR06MB289605B9E1B4234674CB87E2EE800@MWHPR06MB2896.namprd06.prod.outlook.com>
On Mon 14-01-19 16:54:02, Harrosh, Boaz wrote:
> Michal Hocko <mhocko@kernel.org> wrote:
[...]
> >> We run with our own compiled Kernel on various distros, THP is configured
> >> in but mmap against /dev/shm/ never gives me Huge pages. Does it only
> >> work with unanimous mmap ? (I think it is mount dependent which is not
> >> in the application control)
> >
> > If you are talking about THP then you have to enable huge pages for the
> > mapping AFAIR.
>
> This is exactly what I was looking to achieve but was not able to do. Most probably
> a stupid omission on my part, but just to show that it is not that trivial and strait
> out-of-the-man-page way to do it. (Would love a code snippet if you ever wrote one?)
Have you tried
mount -t tmpfs -o huge=always none $MNT_POINT ?
It is true that man pages are silent about this but at least Documentation/admin-guide/mm/transhuge.rst
has an information. Time to send a patch to man pages I would say.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2019-01-14 18:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-11 20:10 Mike Kravetz
2019-01-11 21:55 ` Kirill A. Shutemov
2019-01-11 23:28 ` Mike Kravetz
2019-01-14 13:50 ` Kirill A. Shutemov
2019-01-14 16:29 ` Harrosh, Boaz
2019-01-14 16:40 ` Michal Hocko
2019-01-14 16:54 ` Harrosh, Boaz
2019-01-14 18:02 ` Michal Hocko [this message]
2019-01-14 15:35 ` Steven Sistare
2019-01-14 16:40 ` Harrosh, Boaz
2019-01-14 18:54 ` Mike Kravetz
2019-01-14 19:26 ` Steven Sistare
2019-01-15 8:24 ` Kirill A. Shutemov
2019-01-15 18:08 ` Mike Kravetz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190114180230.GN21345@dhcp22.suse.cz \
--to=mhocko@kernel.org \
--cc=Boaz.Harrosh@netapp.com \
--cc=akpm@linux-foundation.org \
--cc=dan.j.williams@intel.com \
--cc=hughd@google.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=kirill@shutemov.name \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mike.kravetz@oracle.com \
--cc=toshi.kani@hpe.com \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox