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From: | Alberto Garcia |
Subject: | Re: [Qemu-block] [PATCH v14 1/1] qcow2: skip writing zero buffers to empty COW areas |
Date: | Wed, 22 May 2019 13:33:41 +0200 |
User-agent: | Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu) |
On Thu 16 May 2019 04:27:49 PM CEST, Anton Nefedov wrote: > If COW areas of the newly allocated clusters are zeroes on the backing > image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be > used on the whole cluster instead of writing explicit zero buffers later > in perform_cow(). > > iotest 060: > write to the discarded cluster does not trigger COW anymore. > Use a backing image instead. > > Signed-off-by: Anton Nefedov <address@hidden> Reviewed-by: Alberto Garcia <address@hidden> Berto
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