From: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: aliguori@us.ibm.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH -V3 7/8] hw/9pfs: Add new virtfs option cache=none to skip host page cache
Date: Mon, 14 Mar 2011 00:34:24 +0530 [thread overview]
Message-ID: <87y64iq1tz.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <AANLkTimC3bxPiGuw39ydCi2bgCdOK7rYZhd_XdR+u4e_@mail.gmail.com>
On Sun, 13 Mar 2011 17:23:50 +0000, Stefan Hajnoczi <stefanha@gmail.com> wrote:
> On Sat, Mar 5, 2011 at 5:52 PM, Aneesh Kumar K.V
> <aneesh.kumar@linux.vnet.ibm.com> wrote:
> > cache=none implies the file are opened in the host with O_SYNC open flag
>
> O_SYNC does not bypass the host page cache. It ensures that writes
> only complete once data has been written to the disk.
>
> O_DIRECT is a hint to bypass the host page cache when possible.
>
> A boolean on|off option would be nicer than an option that takes the
> special string "none". For example, direct=on|off. It also makes the
> code nicer by using bools instead of strdup strings that get leaked.
>
What i wanted is the O_SYNC behavior. Well the comment should be updated. I
want to make sure that we don't have dirty data in host page cache after
a write. It is always good to make read hit the page cache
-aneesh
next prev parent reply other threads:[~2011-03-13 19:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-05 17:52 [Qemu-devel] [PATCH -V3 1/8] hw/9pfs: Add V9fsfidmap in preparation for adding fd reclaim Aneesh Kumar K.V
2011-03-05 17:52 ` [Qemu-devel] [PATCH -V3 2/8] hw/9pfs: Add file descriptor reclaim support Aneesh Kumar K.V
2011-03-13 16:08 ` Stefan Hajnoczi
2011-03-13 18:57 ` Aneesh Kumar K. V
2011-03-14 10:13 ` Stefan Hajnoczi
2011-03-15 8:35 ` Aneesh Kumar K. V
2011-03-05 17:52 ` [Qemu-devel] [PATCH -V3 3/8] hw/9pfs: Use v9fs_do_close instead of close Aneesh Kumar K.V
2011-03-13 16:10 ` Stefan Hajnoczi
2011-03-13 18:58 ` Aneesh Kumar K. V
2011-03-05 17:52 ` [Qemu-devel] [PATCH -V3 4/8] hw/9pfs: Implement syncfs Aneesh Kumar K.V
2011-03-13 16:24 ` Stefan Hajnoczi
2011-03-13 18:59 ` Aneesh Kumar K. V
2011-03-05 17:52 ` [Qemu-devel] [PATCH -V3 5/8] hw/9pfs: Add open flag to fid Aneesh Kumar K.V
2011-03-13 16:38 ` Stefan Hajnoczi
2011-03-13 19:01 ` Aneesh Kumar K. V
2011-03-05 17:52 ` [Qemu-devel] [PATCH -V3 6/8] hw/9pfs: Add directory reclaim support Aneesh Kumar K.V
2011-03-13 16:42 ` Stefan Hajnoczi
2011-03-13 19:02 ` Aneesh Kumar K. V
2011-03-05 17:52 ` [Qemu-devel] [PATCH -V3 7/8] hw/9pfs: Add new virtfs option cache=none to skip host page cache Aneesh Kumar K.V
2011-03-13 17:23 ` Stefan Hajnoczi
2011-03-13 19:04 ` Aneesh Kumar K. V [this message]
2011-03-13 20:57 ` Stefan Hajnoczi
2011-03-15 8:36 ` Aneesh Kumar K. V
2011-03-14 10:20 ` Stefan Hajnoczi
2011-03-15 9:19 ` Aneesh Kumar K. V
2011-03-15 11:11 ` Stefan Hajnoczi
2011-03-15 12:30 ` Aneesh Kumar K. V
2011-03-16 8:59 ` Stefan Hajnoczi
2011-03-05 17:52 ` [Qemu-devel] [PATCH -V3 8/8] hw/9pfs: Skip file system sync if we have specified cache=none option Aneesh Kumar K.V
2011-03-13 15:46 ` [Qemu-devel] [PATCH -V3 1/8] hw/9pfs: Add V9fsfidmap in preparation for adding fd reclaim Stefan Hajnoczi
2011-03-13 19:06 ` Aneesh Kumar K. V
2011-03-13 20:53 ` Stefan Hajnoczi
2011-03-14 10:23 ` Stefan Hajnoczi
2011-03-15 9:20 ` Aneesh Kumar K. V
2011-03-15 10:38 ` Stefan Hajnoczi
2011-03-15 12:27 ` Aneesh Kumar K. V
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