From: David Hildenbrand <david@redhat.com>
To: Li Qiang <liqiang01@kylinos.cn>, akpm@linux-foundation.org
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com,
vbabka@suse.cz, rppt@kernel.org, surenb@google.com,
mhocko@suse.com
Subject: Re: [PATCH] mm: memory: Force-inline PTE/PMD zapping functions for performance
Date: Mon, 4 Aug 2025 14:51:00 +0200 [thread overview]
Message-ID: <c441e6ee-3118-4603-8c77-c5b2ef40982b@redhat.com> (raw)
In-Reply-To: <20250804123923.296230-1-liqiang01@kylinos.cn>
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@kylinos.cn>
> ---
What's the object file size change?
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-08-04 12:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-04 12:39 [PATCH] mm: memory: Force-inline PTE/PMD zapping functions for performance Li Qiang
2025-08-04 12:51 ` David Hildenbrand [this message]
2025-08-04 13:01 ` Nadav Amit
2025-08-04 13:30 ` David Hildenbrand
2025-08-05 12:04 ` Li Qiang
2025-08-05 13:15 ` Vlastimil Babka
2025-08-06 5:40 ` [PATCH] mm: memory: Force-inline PTE/PMD zapping functions Li Qiang
2025-08-05 13:35 ` [PATCH] mm: memory: Force-inline PTE/PMD zapping functions for performance Lorenzo Stoakes
2025-08-06 5:51 ` Li Qiang
2025-08-07 10:25 ` Vlastimil Babka
2025-08-04 13:15 ` Vlastimil Babka
2025-08-04 13:29 ` Lorenzo Stoakes
2025-08-04 13:59 ` Lorenzo Stoakes
2025-08-04 14:41 ` Vlastimil Babka
2025-08-04 14:50 ` Nadav Amit
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