From: Jan Kara <jack@suse.cz>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Pankaj Gupta <pagupta@redhat.com>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
KVM list <kvm@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux ACPI <linux-acpi@vger.kernel.org>,
Qemu Developers <qemu-devel@nongnu.org>,
linux-ext4 <linux-ext4@vger.kernel.org>,
linux-xfs <linux-xfs@vger.kernel.org>,
Ross Zwisler <zwisler@kernel.org>,
Vishal L Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Christoph Hellwig <hch@infradead.org>,
Len Brown <lenb@kernel.org>, Jan Kara <jack@suse.cz>,
Theodore Ts'o <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
lcapitulino@redhat.com, Kevin Wolf <kwolf@redhat.com>,
Igor Mammedov <imammedo@redhat.com>, jmoyer <jmoyer@redhat.com>,
Nitesh Narayan Lal <nilal@redhat.com>,
Rik van Riel <riel@surriel.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
David Hildenbrand <david@redhat.com>, david <david@fromorbit.com>,
cohuck@redhat.com, Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
Paolo Bonzini <pbonzini@redhat.com>,
kilobyte@angband.pl, yuval.shaia@oracle.com
Subject: Re: [PATCH v5 1/6] libnvdimm: nd_region flush callback support
Date: Fri, 12 Apr 2019 10:32:30 +0200 [thread overview]
Message-ID: <20190412083230.GA29850@quack2.suse.cz> (raw)
In-Reply-To: <CAPcyv4i1FjBzfcWtzeCvj-giHa9xaX0dMQ==q4LZC_L8VEqkHg@mail.gmail.com>
On Thu 11-04-19 07:51:48, Dan Williams wrote:
> On Tue, Apr 9, 2019 at 9:09 PM Pankaj Gupta <pagupta@redhat.com> wrote:
> > + } else {
> > + if (nd_region->flush(nd_region))
> > + rc = -EIO;
>
> Given the common case wants to be fast and synchronous I think we
> should try to avoid retpoline overhead by default. So something like
> this:
>
> if (nd_region->flush == generic_nvdimm_flush)
> rc = generic_nvdimm_flush(...);
I'd either add a comment about avoiding retpoline overhead here or just
make ->flush == NULL mean generic_nvdimm_flush(). Just so that people don't
get confused by the code.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2019-04-12 8:32 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-10 4:08 [PATCH v5 0/6] virtio pmem driver Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 1/6] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-04-11 14:51 ` Dan Williams
2019-04-11 15:57 ` [Qemu-devel] " Pankaj Gupta
2019-04-11 16:09 ` Dan Williams
2019-04-11 16:23 ` Pankaj Gupta
2019-04-12 8:32 ` Jan Kara [this message]
2019-04-12 13:12 ` Jeff Moyer
2019-04-18 6:27 ` [Qemu-devel] " Pankaj Gupta
2019-04-18 16:05 ` Dan Williams
2019-04-18 16:10 ` Jeff Moyer
2019-04-18 16:18 ` Christoph Hellwig
2019-04-18 18:14 ` Dan Williams
2019-04-22 15:51 ` Jeff Moyer
2019-04-22 19:44 ` Dan Williams
2019-04-22 21:03 ` Jeff Moyer
2019-04-23 4:07 ` Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 2/5] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-04-10 12:24 ` Cornelia Huck
2019-04-10 14:38 ` Yuval Shaia
2019-04-10 15:44 ` Pankaj Gupta
2019-04-10 15:38 ` Pankaj Gupta
2019-04-10 13:12 ` Michael S. Tsirkin
2019-04-10 14:03 ` [Qemu-devel] " Pankaj Gupta
2019-04-10 14:31 ` Cornelia Huck
2019-04-10 16:46 ` Michael S. Tsirkin
2019-04-10 16:52 ` Cornelia Huck
2019-04-10 14:41 ` Yuval Shaia
2019-04-10 4:08 ` [PATCH v5 3/6] libnvdimm: add dax_dev sync flag Pankaj Gupta
2019-04-10 8:28 ` Jan Kara
2019-04-10 8:38 ` Pankaj Gupta
2019-04-11 14:56 ` Dan Williams
2019-04-11 15:39 ` Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 4/6] dax: check synchronous mapping is supported Pankaj Gupta
2019-04-10 8:25 ` Jan Kara
2019-04-10 8:31 ` Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 5/6] ext4: disable map_sync for async flush Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 6/6] xfs: " Pankaj Gupta
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=20190412083230.GA29850@quack2.suse.cz \
--to=jack@suse.cz \
--cc=aarcange@redhat.com \
--cc=adilger.kernel@dilger.ca \
--cc=cohuck@redhat.com \
--cc=dan.j.williams@intel.com \
--cc=darrick.wong@oracle.com \
--cc=dave.jiang@intel.com \
--cc=david@fromorbit.com \
--cc=david@redhat.com \
--cc=hch@infradead.org \
--cc=imammedo@redhat.com \
--cc=jasowang@redhat.com \
--cc=jmoyer@redhat.com \
--cc=kilobyte@angband.pl \
--cc=kvm@vger.kernel.org \
--cc=kwolf@redhat.com \
--cc=lcapitulino@redhat.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nvdimm@lists.01.org \
--cc=linux-xfs@vger.kernel.org \
--cc=mst@redhat.com \
--cc=nilal@redhat.com \
--cc=pagupta@redhat.com \
--cc=pbonzini@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=riel@surriel.com \
--cc=rjw@rjwysocki.net \
--cc=stefanha@redhat.com \
--cc=tytso@mit.edu \
--cc=virtualization@lists.linux-foundation.org \
--cc=vishal.l.verma@intel.com \
--cc=willy@infradead.org \
--cc=xiaoguangrong.eric@gmail.com \
--cc=yuval.shaia@oracle.com \
--cc=zwisler@kernel.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 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).