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From: Peter Xu <peterx@redhat.com>
To: guangrong.xiao@gmail.com
Cc: kvm@vger.kernel.org, mst@redhat.com, mtosatti@redhat.com,
	Xiao Guangrong <xiaoguangrong@tencent.com>,
	dgilbert@redhat.com, qemu-devel@nongnu.org, wei.w.wang@intel.com,
	jiang.biao2@zte.com.cn, pbonzini@redhat.com
Subject: Re: [PATCH] migration: fix saving normal page even if it's been compressed
Date: Wed, 2 May 2018 10:46:53 +0800	[thread overview]
Message-ID: <20180502024653.GB25938@xz-mi> (raw)
In-Reply-To: <20180428081045.8878-1-xiaoguangrong@tencent.com>

On Sat, Apr 28, 2018 at 04:10:45PM +0800, guangrong.xiao@gmail.com wrote:
> From: Xiao Guangrong <xiaoguangrong@tencent.com>
> 
> Fix the bug introduced by da3f56cb2e767016 (migration: remove
> ram_save_compressed_page()), It should be 'return' rather than
> 'res'
> 
> Sorry for this stupid mistake :(
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>

Reviewed-by: Peter Xu <peterx@redhat.com>

So is that only a performance degradation without this fix (since
AFAIU the compressing pages will be sent twice)?  Thanks,

> ---
>  migration/ram.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/migration/ram.c b/migration/ram.c
> index 01cc815410..699546cc43 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -1490,7 +1490,7 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
>       * CPU resource.
>       */
>      if (block == rs->last_sent_block && save_page_use_compression(rs)) {
> -        res = compress_page_with_multi_thread(rs, block, offset);
> +        return compress_page_with_multi_thread(rs, block, offset);
>      }
>  
>      return ram_save_page(rs, pss, last_stage);
> -- 
> 2.14.3
> 

-- 
Peter Xu

WARNING: multiple messages have this Message-ID
From: Peter Xu <peterx@redhat.com>
To: guangrong.xiao@gmail.com
Cc: pbonzini@redhat.com, mst@redhat.com, mtosatti@redhat.com,
	qemu-devel@nongnu.org, kvm@vger.kernel.org, dgilbert@redhat.com,
	jiang.biao2@zte.com.cn, wei.w.wang@intel.com,
	Xiao Guangrong <xiaoguangrong@tencent.com>
Subject: Re: [Qemu-devel] [PATCH] migration: fix saving normal page even if it's been compressed
Date: Wed, 2 May 2018 10:46:53 +0800	[thread overview]
Message-ID: <20180502024653.GB25938@xz-mi> (raw)
In-Reply-To: <20180428081045.8878-1-xiaoguangrong@tencent.com>

On Sat, Apr 28, 2018 at 04:10:45PM +0800, guangrong.xiao@gmail.com wrote:
> From: Xiao Guangrong <xiaoguangrong@tencent.com>
> 
> Fix the bug introduced by da3f56cb2e767016 (migration: remove
> ram_save_compressed_page()), It should be 'return' rather than
> 'res'
> 
> Sorry for this stupid mistake :(
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>

Reviewed-by: Peter Xu <peterx@redhat.com>

So is that only a performance degradation without this fix (since
AFAIU the compressing pages will be sent twice)?  Thanks,

> ---
>  migration/ram.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/migration/ram.c b/migration/ram.c
> index 01cc815410..699546cc43 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -1490,7 +1490,7 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
>       * CPU resource.
>       */
>      if (block == rs->last_sent_block && save_page_use_compression(rs)) {
> -        res = compress_page_with_multi_thread(rs, block, offset);
> +        return compress_page_with_multi_thread(rs, block, offset);
>      }
>  
>      return ram_save_page(rs, pss, last_stage);
> -- 
> 2.14.3
> 

-- 
Peter Xu

  reply	other threads:[~2018-05-02  2:46 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-28  8:10 [PATCH] migration: fix saving normal page even if it's been compressed guangrong.xiao
2018-04-28  8:10 ` [Qemu-devel] " guangrong.xiao
2018-05-02  2:46 ` Peter Xu [this message]
2018-05-02  2:46   ` Peter Xu
2018-05-02 15:30   ` Dr. David Alan Gilbert
2018-05-02 15:30     ` [Qemu-devel] " Dr. David Alan Gilbert
2018-05-03  2:21     ` Peter Xu
2018-05-03  2:21       ` [Qemu-devel] " Peter Xu
2018-05-03  3:13   ` Xiao Guangrong
2018-05-03  3:13     ` [Qemu-devel] " Xiao Guangrong

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