From: Cliff Wickman <cpw@sgi.com>
To: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: kumagai-atsushi@mxc.nes.nec.co.jp, d.hatayama@jp.fujitsu.com,
kexec@lists.infradead.org
Subject: Re: [PATCH 1/2 V2] raw i/o and root device to use less memory
Date: Mon, 13 Jan 2014 07:30:33 -0600 [thread overview]
Message-ID: <20140113133033.GA917@sgi.com> (raw)
In-Reply-To: <20140113105831.57412728@holzheu>
On Mon, Jan 13, 2014 at 10:58:31AM +0100, Michael Holzheu wrote:
> On Fri, 10 Jan 2014 11:58:30 -0600
> Cliff Wickman <cpw@sgi.com> wrote:
>
> [snip]
>
> > Use O_DIRECT (raw) i/o for the dump and for the bitmaps file, so that writing
> > to those files does not allocate kernel memory for page cache.
>
> Hello Cliff,
>
> Have you tested O_DIRECT together with the new vmcore mmap interface?
> IIRC when we tried O_DIRECT together with mmap for some reason it did
> not work.
>
> Michael
Hi Michael,
How new of a kernel do I need? i.e. how 'new' of an mmap interface?
The latest kernel I used was 3.0.93 (sle11sp3).
And makedumpfile was 1.5.5.
-Cliff
--
Cliff Wickman
SGI
cpw@sgi.com
(651) 683-3824
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next prev parent reply other threads:[~2014-01-13 13:30 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-31 23:30 [PATCH 0/2] makedumpfile: for large memories cpw
2013-12-31 23:34 ` [PATCH 1/2] makedumpfile: raw i/o and use of root device Cliff Wickman
2013-12-31 23:36 ` [PATCH 2/2] makedumpfile: exclude unused vmemmap pages Cliff Wickman
2014-01-06 9:27 ` [PATCH 0/2] makedumpfile: for large memories Atsushi Kumagai
2014-01-09 0:25 ` Cliff Wickman
2014-01-10 7:48 ` Atsushi Kumagai
2014-01-10 18:23 ` Cliff Wickman
2014-01-14 12:59 ` HATAYAMA Daisuke
2014-01-07 10:14 ` HATAYAMA Daisuke
2014-01-10 17:58 ` [PATCH 1/2 V2] raw i/o and root device to use less memory Cliff Wickman
2014-01-13 9:58 ` Michael Holzheu
2014-01-13 13:30 ` Cliff Wickman [this message]
2014-01-13 15:02 ` Michael Holzheu
2014-01-10 18:00 ` [PATCH 2/2 V2] exclude unused vmemmap pages Cliff Wickman
2014-01-14 11:33 ` [PATCH 0/2] makedumpfile: for large memories HATAYAMA Daisuke
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