From: Jan Beulich <jbeulich@suse.com>
To: Demi Marie Obenour <demi@invisiblethingslab.com>
Cc: Xen developer discussion <xen-devel@lists.xenproject.org>
Subject: Re: Grant operation batching
Date: Fri, 20 May 2022 08:24:48 +0200 [thread overview]
Message-ID: <dcf54bdb-e588-430d-e2db-30b6fd4280b7@suse.com> (raw)
In-Reply-To: <YobRWXY/xVli4UUf@itl-email>
On 20.05.2022 01:22, Demi Marie Obenour wrote:
> It is well known that mapping and unmapping grants is expensive, which
> is why blkback has persistent grants. Could this cost be mitigated by
> batching, and if it was, would it affect the tradeoff of memcpy() vs
> grant table operations?
Which backend driver are you thinking about? The in-kernel Linux
xen-blkback already batches grant operations, afaics. Such
batching is helpful, but the main cost is assumed (known?) to be
with the (installing and) tearing down of the actual mappings of
the guest pages (into/)from backend address space.
Jan
next prev parent reply other threads:[~2022-05-20 6:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-19 23:22 Grant operation batching Demi Marie Obenour
2022-05-20 6:24 ` Jan Beulich [this message]
2022-05-20 12:37 ` Demi Marie Obenour
2022-05-20 12:44 ` Jan Beulich
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=dcf54bdb-e588-430d-e2db-30b6fd4280b7@suse.com \
--to=jbeulich@suse.com \
--cc=demi@invisiblethingslab.com \
--cc=xen-devel@lists.xenproject.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.