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From: WANG Rui <r@hev.cc>
To: usama.arif@linux.dev
Cc: Liam.Howlett@oracle.com, ajd@linux.ibm.com,
	akpm@linux-foundation.org, anshuman.khandual@arm.com,
	apopple@nvidia.com, baohua@kernel.org,
	baolin.wang@linux.alibaba.com, brauner@kernel.org,
	catalin.marinas@arm.com, david@kernel.org, dev.jain@arm.com,
	hannes@cmpxchg.org, jack@suse.cz, kas@kernel.org,
	kees@kernel.org, kernel-team@meta.com, kevin.brodsky@arm.com,
	lance.yang@linux.dev, linux-arm-kernel@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, lorenzo.stoakes@oracle.com,
	npache@redhat.com, rmclure@linux.ibm.com, ryan.roberts@arm.com,
	shakeel.butt@linux.dev, viro@zeniv.linux.org.uk, will@kernel.org,
	willy@infradead.org, ziy@nvidia.com, WANG Rui <r@hev.cc>
Subject: [PATCH 3/4] elf: align ET_DYN base to exec folio order for contpte mapping
Date: Fri, 13 Mar 2026 22:42:13 +0800	[thread overview]
Message-ID: <20260313144213.95686-1-r@hev.cc> (raw)
In-Reply-To: <20260310145406.3073394-4-usama.arif@linux.dev>

Hi Usama,

Glad to see you're pushing on this, I'm also following it. I first noticed this when rustc's perf regressed after a binutils upgrade. I'm trying to make ld.so to aware THP and adjust PT_LOAD alignment to increase the chances of shared libraries being mapped by THP [1]. As you're probably seen, I'm doing something similar in the kernel to improve it for executables [2].

> +			if (exec_folio_order())
> +				alignment = max(alignment,
> +					(unsigned long)PAGE_SIZE << exec_folio_order());

I’m curious, does it make sense to add some constraints here, like only increasing p_align when the segment length, virtual address, and file offset are all huge-aligned, as I did in my patch? This has come up several times in the glibc review, where increasing alignment was noted to reduce ASLR entropy.

[1] https://sourceware.org/pipermail/libc-alpha/2026-March/175776.html
[2] https://lore.kernel.org/linux-fsdevel/20260313005211.882831-1-r@hev.cc

Thanks,
Rui


  reply	other threads:[~2026-03-13 14:42 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-10 14:51 [PATCH 0/4] arm64/mm: contpte-sized exec folios for 16K and 64K pages Usama Arif
2026-03-10 14:51 ` [PATCH 1/4] arm64: request contpte-sized folios for exec memory Usama Arif
2026-03-19  7:35   ` David Hildenbrand (Arm)
2026-03-10 14:51 ` [PATCH 2/4] mm: bypass mmap_miss heuristic for VM_EXEC readahead Usama Arif
2026-03-18 16:43   ` Jan Kara
2026-03-19  7:37     ` David Hildenbrand (Arm)
2026-03-10 14:51 ` [PATCH 3/4] elf: align ET_DYN base to exec folio order for contpte mapping Usama Arif
2026-03-13 14:42   ` WANG Rui [this message]
2026-03-13 19:47     ` Usama Arif
2026-03-14  2:10       ` hev
2026-03-10 14:51 ` [PATCH 4/4] mm: align file-backed mmap to exec folio order in thp_get_unmapped_area Usama Arif
2026-03-14  3:47   ` WANG Rui
2026-03-13 13:20 ` [PATCH 0/4] arm64/mm: contpte-sized exec folios for 16K and 64K pages David Hildenbrand (Arm)
2026-03-13 19:59   ` Usama Arif
2026-03-16 16:06     ` David Hildenbrand (Arm)
2026-03-18 10:41       ` Usama Arif
2026-03-18 12:41         ` David Hildenbrand (Arm)
2026-03-13 16:33 ` Ryan Roberts
2026-03-13 20:55   ` Usama Arif
2026-03-18 10:52     ` Usama Arif
2026-03-19  7:40       ` David Hildenbrand (Arm)
2026-03-14 13:20   ` WANG Rui
2026-03-13 16:35 ` hev
2026-03-14  9:50 ` WANG Rui
2026-03-18 10:57   ` Usama Arif
2026-03-18 11:46     ` WANG Rui

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