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

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Message-ID: <04103944-bb22-45c4-8fe8-2a0a6554a289@suse.cz>
Date: Mon, 4 Aug 2025 15:15:42 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: David Hildenbrand <david@...hat.com>, 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, rppt@...nel.org,
 surenb@...gle.com, mhocko@...e.com
Subject: Re: [PATCH] mm: memory: Force-inline PTE/PMD zapping functions for
 performance

On 8/4/25 14:51, David Hildenbrand wrote:
> 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?

The output of ./scripts/bloat-o-meter would be the most informative.