From: "H. Peter Anvin" <hpa@zytor.com>
To: Ethan Zhao <haifeng.zhao@linux.intel.com>, Xin Li <xin@zytor.com>,
Ethan Zhao <etzhao@outlook.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: tglx@linutronix.de, dave.hansen@linux.intel.com, x86@kernel.org,
andrew.cooper3@citrix.com, mingo@redhat.com, bp@alien8.de
Subject: Re: [PATCH] x86/fred: Optimize the FRED entry by prioritizing high-probability event dispatching
Date: Fri, 17 Jan 2025 08:24:43 -0800 [thread overview]
Message-ID: <c111ecfe-9055-46f3-8bd0-808a4dc039dd@zytor.com> (raw)
In-Reply-To: <33b89995-b638-4a6b-a75f-8278562237c4@linux.intel.com>
>
> In short, seems that __builtin_expect not work with switch(), at least for
> gcc version 8.5.0 20210514(RHEL).
>
For forward-facing optimizations, please don't use an ancient version of
gcc as the benchmark.
-hpa
next prev parent reply other threads:[~2025-01-17 16:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-16 6:51 [PATCH] x86/fred: Optimize the FRED entry by prioritizing high-probability event dispatching Ethan Zhao
2025-01-16 7:27 ` Xin Li
2025-01-16 9:22 ` Ethan Zhao
2025-01-16 13:03 ` Ethan Zhao
2025-01-16 13:48 ` Xin Li
2025-01-17 0:37 ` Ethan Zhao
2025-01-17 1:21 ` H. Peter Anvin
2025-01-17 3:04 ` Ethan Zhao
2025-01-17 4:19 ` Ethan Zhao
2025-01-17 4:43 ` Xin Li
2025-01-17 5:18 ` Ethan Zhao
2025-01-17 5:54 ` Xin Li
2025-01-17 6:58 ` Ethan Zhao
2025-01-17 16:17 ` H. Peter Anvin
2025-01-17 16:23 ` H. Peter Anvin
2025-01-18 4:00 ` Ethan Zhao
2025-01-17 16:24 ` H. Peter Anvin [this message]
2025-01-18 3:29 ` Ethan Zhao
2025-01-18 3:41 ` H. Peter Anvin
2025-01-18 4:06 ` Ethan Zhao
2025-01-18 4:09 ` H. Peter Anvin
2025-01-18 5:55 ` Ethan Zhao
2025-01-18 4:14 ` H. Peter Anvin
2025-01-18 6:02 ` Ethan Zhao
2025-01-16 15:08 ` Nikolay Borisov
2025-01-16 18:45 ` Xin Li
2025-01-17 0:40 ` Ethan Zhao
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