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Re: [Qemu-devel] [PATCH] blockdev: acquire aio_context for bitmap add/re
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From: |
Vladimir Sementsov-Ogievskiy |
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Subject: |
Re: [Qemu-devel] [PATCH] blockdev: acquire aio_context for bitmap add/remove |
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Date: |
Wed, 6 Feb 2019 17:19:17 +0000 |
add Paolo
06.02.2019 20:02, John Snow wrote:
> When bitmaps are persistent, they may incur a disk read or write when bitmaps
> are added or removed. For configurations like virtio-dataplane, failing to
> acquire this lock will abort QEMU when disk IO occurs.
>
> We used to acquire aio_context as part of the bitmap lookup, so re-introduce
> the lock for just the cases that have an IO penalty.
>
> Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1672010
> Reported-By: Aihua Liang <address@hidden>
> Signed-off-by: John Snow <address@hidden>
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Best regards,
Vladimir