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Re: [Qemu-devel] [v8 Patch 0/6]Qemu: Host pagecache setting from cmdline
From: |
Zhi Yong Wu |
Subject: |
Re: [Qemu-devel] [v8 Patch 0/6]Qemu: Host pagecache setting from cmdline and monitor |
Date: |
Fri, 4 Nov 2011 10:29:41 +0800 |
On Sun, Oct 30, 2011 at 6:33 PM, Supriya Kannery
<address@hidden> wrote:
> Currently cache setting of a block device cannot be changed
> without restarting a running VM. Following patchset is for
> enabling dynamic change of cache setting for block devices
> through qemu monitor. Code changes are based on patches
> from Christoph Hellwig and Prerna Saxena.
>
> This patchset introduces
> a. monitor command 'block_set_hostcache' using which host
> pagecache setting for a block device can be changed
> dynamically.
I got a bit confusion. Is it used to change host pagecache setting on
hyperviser or on guest?
This block device said by you is for guest, right?
> b. a new option for setting host cache from qemu
> commandline option -drive "hostcache=on/off".
> c. BDRVReopenState, a generic structure which can be
> extended by each of the block drivers to reopen
> respective image files.
> Extension of this structure for drivers raw-posix
> is done here.
> d. 'hostcache and 'cache' options when used together,
> cache=xx will override hostcache=yy.
>
> v8:
> 1. Mandate implementation of all three reopen
> related functions by block drivers.
> 2. If 'cache=xx' and 'hostcache=yy' specified
> in cmdline, 'cache=' overrides 'hostcache='.
>
>
> v7:
> 1. Added structure BDRVReopenState to support safe
> reopening of image files.
> 2. Implemented reopen functions for raw-posix driver
>
> v6:
> 1. "block_set_hostcache" to replace "block_set" command
>
> v5:
> 1. Defined qerror class for incorrect command syntax.
> 2. Changed error_report() calls to qerror_report()
>
> v4:
> Added 'hostcache' option to '-drive' commandline option.
>
> v3:
> 1. Command "block_set" for changing various block params
> 2. Enhanced info-block to display hostcache setting
> 3. Added qmp interfaces for setting and querying hostcache
>
> v2:
> 1. Support of dynamic cache change only for hostcache.
> 2. Monitor command "hostcache_get" added to display cache setting
> 3. Backed off the changes for display of cache setting in "info block"
>
> v1:
> Dynamic cache change through monitor
>
> New block command added:
> "block_set_hostcache"
> -- Sets hostcache parameter for block device while guest is running.
>
> Usage:
> block_set_hostcache <device> <option>
> <device> = block device
> <option> = on/off
>
>
> New 'hostcache' option added to -drive:
> -drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]\n"
> ....
> " [,readonly=on|off][,hostcache=on|off]\n"
>
> qemu/block.c | 79 +++++++++++++++++++++++++++++++++++++++--------
> qemu/block.h | 3 ++
> qemu/block/raw-posix.c | 57 +++++++++++++++++++++++++++++++++++++++++
> qemu/block/raw.c | 23 +++++++++++++++-
> qemu/block_int.h | 16 +++++++++++
> qemu/blockdev.c | 7 +++++
> qemu/qemu-common.h | 1
> qemu/qemu-config.c | 4 ++
> qemu/qemu-options.hx | 2 -
> qemu/qerror.c | 8 +++++
> qemu/qerror.h | 6 ++++
> qemu/qmp-commands.hx | 4 ++
> 14 files changed, 194 insertions(+), 16 deletions(-)
> ~
> ~
> ~
> ~
> ~
> ~
> ~
> ~
> ~
> ~
> "txt" 13L, 574C
>
>
>
>
>
>
>
--
Regards,
Zhi Yong Wu
- Re: [Qemu-devel] [v8 Patch 0/6]Qemu: Host pagecache setting from cmdline and monitor,
Zhi Yong Wu <=