From: Stephen Hemminger <stephen@networkplumber.org>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
"dev@dpdk.org" <dev@dpdk.org>,
"marcel@redhat.com" <marcel@redhat.com>,
Changchun Ouyang <changchun.ouyang@intel.com>
Subject: Re: [dpdk-dev] [PATCH v7 4/8] vhost: rxtx: use queue id instead of constant ring index
Date: Wed, 21 Oct 2015 08:47:47 -0700 [thread overview]
Message-ID: <20151021084747.6c2ca303@xeon-e3> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB97725836AB321F@irsmsx105.ger.corp.intel.com>
On Wed, 21 Oct 2015 09:38:37 +0000
"Ananyev, Konstantin" <konstantin.ananyev@intel.com> wrote:
> > > minor nits:
> > > * this doesn't need to be marked as always inline,
> > > that is as they say in English "shooting a fly with a bazooka"
> > Stephen:
> > always_inline "forces" the compiler to inline this function, like a macro.
> > When should it be used or is it not preferred at all?
>
> I also don't understand what's wrong with using 'always_inline' here.
> As I understand the author wants compiler to *always inline* that function.
> So seems perfectly ok to use it here.
> As I remember just 'inline' is sort of recommendation that compiler is free to ignore.
> Konstantin
I follow Linux/Linus advice and resist the urge to add strong inlining.
The compiler does a good job of deciding to inline, and many times
the reason it chooses for not inlining are quite good like:
- the code is on an unlikely branch
- register pressure means inlining would mean the code would be worse
Therefore my rules are:
* only use inline for small functions. Let compiler decide on larger static funcs
* write code where most functions are static (localized scope) where compiler
can decide
* reserve always inline for things that access hardware and would break if not inlined.
next prev parent reply other threads:[~2015-10-21 15:47 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-21 3:48 [dpdk-dev] [PATCH v7 0/8] vhost-user multiple queues enabling Yuanhan Liu
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 1/8] vhost-user: add protocol features support Yuanhan Liu
2015-10-22 9:52 ` Xie, Huawei
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 2/8] vhost-user: add VHOST_USER_GET_QUEUE_NUM message Yuanhan Liu
2015-10-22 9:38 ` Xie, Huawei
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 3/8] vhost: vring queue setup for multiple queue support Yuanhan Liu
2015-10-21 4:45 ` Stephen Hemminger
2015-10-21 6:52 ` Yuanhan Liu
2015-10-22 9:49 ` Xie, Huawei
2015-10-22 11:30 ` Yuanhan Liu
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 4/8] vhost: rxtx: use queue id instead of constant ring index Yuanhan Liu
2015-10-21 4:43 ` Stephen Hemminger
2015-10-21 6:54 ` Yuanhan Liu
2015-10-21 7:16 ` Xie, Huawei
2015-10-21 9:38 ` Ananyev, Konstantin
2015-10-21 15:47 ` Stephen Hemminger [this message]
2015-10-21 15:52 ` Thomas Monjalon
2015-10-21 15:57 ` Bruce Richardson
2015-10-21 15:55 ` Bruce Richardson
2015-10-21 16:29 ` Ananyev, Konstantin
2015-10-21 10:31 ` Michael S. Tsirkin
2015-10-21 12:48 ` Yuanhan Liu
2015-10-21 14:26 ` Michael S. Tsirkin
2015-10-21 14:59 ` Yuanhan Liu
2015-10-22 9:49 ` Yuanhan Liu
2015-10-22 11:32 ` Michael S. Tsirkin
2015-10-22 14:07 ` Yuanhan Liu
2015-10-22 14:19 ` Michael S. Tsirkin
2015-10-23 8:02 ` Yuanhan Liu
2015-10-24 2:34 ` Flavio Leitner
2015-10-24 17:47 ` Michael S. Tsirkin
2015-10-28 20:30 ` Flavio Leitner
2015-10-28 21:12 ` Michael S. Tsirkin
2015-11-16 22:20 ` Flavio Leitner
2015-11-17 8:23 ` Michael S. Tsirkin
2015-11-17 9:24 ` Jason Wang
2015-11-17 22:49 ` Flavio Leitner
2015-10-22 7:26 ` Xie, Huawei
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 5/8] virtio: fix deadloop due to reading virtio_net_config incorrectly Yuanhan Liu
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 6/8] vhost-user: enable vhost-user multiple queue Yuanhan Liu
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 7/8] vhost: add VHOST_USER_SET_VRING_ENABLE message Yuanhan Liu
2015-10-21 3:48 ` [dpdk-dev] [PATCH v7 8/8] doc: update release note for vhost-user mq support Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 0/8] vhost-user multiple queues enabling Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 1/8] vhost-user: add protocol features support Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 2/8] vhost-user: add VHOST_USER_GET_QUEUE_NUM message Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 3/8] vhost: vring queue setup for multiple queue support Yuanhan Liu
2015-10-26 5:24 ` Tetsuya Mukawa
2015-10-26 5:42 ` Yuanhan Liu
2015-10-27 6:20 ` Tetsuya Mukawa
2015-10-27 9:17 ` Michael S. Tsirkin
2015-10-27 9:30 ` Yuanhan Liu
2015-10-27 9:42 ` Michael S. Tsirkin
2015-10-27 9:51 ` Thomas Monjalon
2015-10-27 9:55 ` Michael S. Tsirkin
2015-10-27 10:41 ` Xie, Huawei
2015-10-27 9:53 ` Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 4/8] vhost: rxtx: use queue id instead of constant ring index Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 5/8] virtio: fix deadloop due to reading virtio_net_config incorrectly Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 6/8] vhost: add VHOST_USER_SET_VRING_ENABLE message Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 7/8] vhost-user: enable vhost-user multiple queue Yuanhan Liu
2015-10-22 12:35 ` [dpdk-dev] [PATCH v8 8/8] doc: update release note for vhost-user mq support Yuanhan Liu
2015-10-26 20:22 ` Thomas Monjalon
2015-10-27 9:38 ` Yuanhan Liu
2015-10-26 1:36 ` [dpdk-dev] [PATCH v8 0/8] vhost-user multiple queues enabling Xie, Huawei
2015-10-26 3:09 ` Yuanhan Liu
2015-10-26 20:26 ` Thomas Monjalon
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=20151021084747.6c2ca303@xeon-e3 \
--to=stephen@networkplumber.org \
--cc=changchun.ouyang@intel.com \
--cc=dev@dpdk.org \
--cc=konstantin.ananyev@intel.com \
--cc=marcel@redhat.com \
--cc=mst@redhat.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).