From: Dave Hansen <dave.hansen@intel.com>
To: Uros Bizjak <ubizjak@gmail.com>,
x86@kernel.org, xen-devel@lists.xenproject.org,
linux-kernel@vger.kernel.org
Cc: Juergen Gross <jgross@suse.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v2 0/4] Introduce %rip-relative addressing to PER_CPU_VAR macro
Date: Thu, 12 Oct 2023 13:53:47 -0700 [thread overview]
Message-ID: <3af8dcec-66ec-4bd4-b7bf-4bc6f5f3c70f@intel.com> (raw)
In-Reply-To: <20231012201743.292149-1-ubizjak@gmail.com>
On 10/12/23 13:12, Uros Bizjak wrote:
> The last patch introduces (%rip) suffix and uses it for x86_64 target,
> resulting in a small code size decrease: text data bss dec hex filename
> 25510677 4386685 808388 30705750 1d48856 vmlinux-new.o 25510629 4386685
> 808388 30705702 1d48826 vmlinux-old.o
I feel like I'm missing some of the motivation here.
50 bytes is great and all, but it isn't without the cost of changing
some rules and introducing potential PER_CPU_ARG() vs. PER_CPU_VAR()
confusion.
Are there some other side benefits? What else does this enable?
next prev parent reply other threads:[~2023-10-12 20:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-12 20:12 Uros Bizjak
2023-10-12 20:12 ` [PATCH v2 1/4] x86/percpu: Introduce PER_CPU_ARG and use it in cmpxchg{8,16}b_emu.S Uros Bizjak
2023-10-12 20:12 ` [PATCH v2 2/4] x86/percpu: Correct PER_CPU_VAR usage to include symbol and its addend Uros Bizjak
2023-10-12 20:12 ` [PATCH v2 3/4] x86/percpu, xen: " Uros Bizjak
2023-10-12 20:12 ` [PATCH v2 4/4] x86/percpu: Introduce %rip-relative addressing to PER_CPU_VAR macro Uros Bizjak
2023-10-12 20:53 ` Dave Hansen [this message]
2023-10-12 20:59 ` [PATCH v2 0/4] " Uros Bizjak
2023-10-12 21:08 ` H. Peter Anvin
2023-10-12 21:17 ` Uros Bizjak
2023-10-12 21:21 ` H. Peter Anvin
2023-10-12 22:44 ` Uros Bizjak
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=3af8dcec-66ec-4bd4-b7bf-4bc6f5f3c70f@intel.com \
--to=dave.hansen@intel.com \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=hpa@zytor.com \
--cc=jgross@suse.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=ubizjak@gmail.com \
--cc=x86@kernel.org \
--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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®