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From: hev <r@hev.cc>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
	Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
	 Kees Cook <kees@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	 "David Hildenbrand (Arm)" <david@kernel.org>
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	 linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] binfmt_elf: Align eligible read-only PT_LOAD segments to PMD_SIZE for THP
Date: Sun, 8 Mar 2026 17:57:27 +0800	[thread overview]
Message-ID: <CAHirt9hA=yw1NDS5zz0qkLEtczu1STZFBeq+soEF0GYhN8HTBw@mail.gmail.com> (raw)
In-Reply-To: <20260304114727.384416-1-r@hev.cc>

Hi,

I ran a quick benchmark on x86_64 as well.

Machine: AMD Ryzen 9 7950X
Binutils: 2.46
GCC: 15.2.1 (built with -z,noseparate-code + --enable-host-pie)

Workload: building Linux v7.0-rc1 with x86_64_defconfig.

Without patch:

 * instructions:     8,246,133,611,932
 * cpu-cycles:       8,001,028,142,928
 * itlb-misses:      3,672,158,331
 * time elapsed:     64.66 s

With patch:

 * instructions:     8,246,025,137,750
 * cpu-cycles:       7,565,925,107,502
 * itlb-misses:      26,821,242
 * time elapsed:     61.97 s

Instructions are basically unchanged. iTLB misses drop from ~3.67B to
~26M (~99.27% reduction), which results in about a ~5.44% reduction in
cycles and ~4.18% shorter wall time for this workload.

Thanks,
Rui


  reply	other threads:[~2026-03-08  9:57 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-04 11:47 WANG Rui
2026-03-08  9:57 ` hev [this message]
2026-03-09 14:22 ` David Hildenbrand (Arm)

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