linux-kernel - Re: [PATCH] mm: memory: Force-inline PTE/PMD zapping functions for performance

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Message-ID: <c441e6ee-3118-4603-8c77-c5b2ef40982b@redhat.com>
Date: Mon, 4 Aug 2025 14:51:00 +0200
From: David Hildenbrand <david@...hat.com>
To: Li Qiang <liqiang01@...inos.cn>, akpm@...ux-foundation.org
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com, vbabka@...e.cz,
 rppt@...nel.org, surenb@...gle.com, mhocko@...e.com
Subject: Re: [PATCH] mm: memory: Force-inline PTE/PMD zapping functions for
 performance

On 04.08.25 14:39, Li Qiang wrote:
> This change converts several critical page table zapping functions from
> `inline` to `__always_inline`, resulting in measurable performance
> improvements in process spawning workloads.
> 
> Performance Impact (Intel Xeon Gold 6430 2.1GHz):
> - UnixBench 'context1' test shows ~6% improvement (single-core)
> - UnixBench  shows ~0.6% improvement (single-core)
> - mm/memory.o size reduced by 2.49% (70190 -> 68445 bytes)
> - Net code reduction of 1745 bytes (add/remove: 211/166)
> 
> The modified functions form a hot path during process teardown:
> 1. zap_present_ptes()
> 2. do_zap_pte_range()
> 3. zap_pte_range()
> 4. zap_pmd_range()
> 
> Signed-off-by: Li Qiang <liqiang01@...inos.cn>
> ---

What's the object file size change?

-- 
Cheers,

David / dhildenb