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Re: [Qemu-devel] [PATCH 21/29] exec: only check relevant bitmaps for cle

From: Fam Zheng
Subject: Re: [Qemu-devel] [PATCH 21/29] exec: only check relevant bitmaps for cleanliness
Date: Tue, 26 May 2015 19:31:37 +0800
User-agent: Mutt/1.5.23 (2014-03-12)

On Mon, 04/27 18:28, Paolo Bonzini wrote:
> Most of the time, not all bitmaps have to be marked as dirty;
> do not do anything if the interesting ones are already dirty.
> Previously, any clean bitmap would have cause all the bitmaps to be
> marked dirty.
> In fact, unless running TCG most of the time bitmap operations need
> not be done at all, because memory_region_is_logging returns zero.
> In this case, skip the call to cpu_physical_memory_range_includes_clean
> altogether as well.
> With this patch, cpu_physical_memory_set_dirty_range is called
> unconditionally, so there need not be anymore a separate call to
> xen_modified_memory.
> Signed-off-by: Paolo Bonzini <address@hidden>

Reviewed-by: Fam Zheng <address@hidden>

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