From: Kevin Wolf <kwolf@redhat.com>
To: qemu-devel@nongnu.org
Cc: kwolf@redhat.com, stefanha@gmail.com
Subject: [Qemu-devel] [RFC PATCH 0/3] qcow2: Save requests during cluster allocation
Date: Fri, 2 Mar 2012 19:48:48 +0100 [thread overview]
Message-ID: <1330714131-16908-1-git-send-email-kwolf@redhat.com> (raw)
When a write request spans both allocated and unallocated clusters, qcow2
splits the request in two parts. This is not necessary if we have sequential
writes: If the unallocated area can be allocated such that in the image file it
is adjacent to the already allocated part, a single request is enough.
Kevin Wolf (3):
qcow2: Factor out count_cow_clusters
qcow2: Add qcow2_alloc_clusters_at()
qcow2: Reduce number of I/O requests
block/qcow2-cluster.c | 274 +++++++++++++++++++++++++++++++++---------------
block/qcow2-refcount.c | 28 +++++
block/qcow2.h | 3 +
trace-events | 1 +
4 files changed, 222 insertions(+), 84 deletions(-)
--
1.7.6.5
next reply other threads:[~2012-03-02 18:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-02 18:48 Kevin Wolf [this message]
2012-03-02 18:48 ` [Qemu-devel] [PATCH 1/3] qcow2: Factor out count_cow_clusters Kevin Wolf
2012-03-02 18:48 ` [Qemu-devel] [PATCH 2/3] qcow2: Add qcow2_alloc_clusters_at() Kevin Wolf
2012-03-02 18:48 ` [Qemu-devel] [PATCH 3/3] qcow2: Reduce number of I/O requests Kevin Wolf
2012-03-09 13:08 ` [Qemu-devel] [RFC PATCH 0/3] qcow2: Save requests during cluster allocation Stefan Hajnoczi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1330714131-16908-1-git-send-email-kwolf@redhat.com \
--to=kwolf@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=stefanha@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).