From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Pedro Falcato <pfalcato@suse.de>,
"Lorenzo Stoakes (Oracle)" <ljs@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@kernel.org>, Jann Horn <jannh@google.com>,
Dev Jain <dev.jain@arm.com>, Luke Yang <luyang@redhat.com>,
jhladky@redhat.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/4] mm/mprotect: un-inline folio_pte_batch_flags()
Date: Fri, 20 Mar 2026 12:02:17 +0100 [thread overview]
Message-ID: <076b36f7-1ed3-49ce-a892-eefd189870df@kernel.org> (raw)
In-Reply-To: <tv6pcikk456ynfx7lz3lrql3yafg4njuy3bzi4v6yi5hpe27gi@hakvdy2jmewu>
>
> which the compiler FWIW tries to inline it all into one function, but then
> does a poor job at figuring things out. And the CPU gets confused too. It
> was frankly shocking how much performance I could squeeze out of a
>
> if (nr_ptes == 1) {
> /* don't bother with the loops and the funny logic */
> }
Yes, same experience with fork/munmap.
--
Cheers,
David
next prev parent reply other threads:[~2026-03-20 11:02 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-19 18:31 [PATCH 0/4] mm/mprotect: micro-optimization work Pedro Falcato
2026-03-19 18:31 ` [PATCH 1/4] mm/mprotect: encourage inlining with __always_inline Pedro Falcato
2026-03-19 18:59 ` Lorenzo Stoakes (Oracle)
2026-03-19 19:00 ` Lorenzo Stoakes (Oracle)
2026-03-19 21:28 ` David Hildenbrand (Arm)
2026-03-20 9:59 ` Pedro Falcato
2026-03-20 10:08 ` David Hildenbrand (Arm)
2026-03-19 18:31 ` [PATCH 2/4] mm/mprotect: move softleaf code out of the main function Pedro Falcato
2026-03-19 19:06 ` Lorenzo Stoakes (Oracle)
2026-03-19 21:33 ` David Hildenbrand (Arm)
2026-03-20 10:04 ` Pedro Falcato
2026-03-20 10:07 ` David Hildenbrand (Arm)
2026-03-20 10:54 ` Lorenzo Stoakes (Oracle)
2026-03-19 18:31 ` [PATCH 3/4] mm/mprotect: un-inline folio_pte_batch_flags() Pedro Falcato
2026-03-19 19:14 ` Lorenzo Stoakes (Oracle)
2026-03-19 21:41 ` David Hildenbrand (Arm)
2026-03-20 10:36 ` Lorenzo Stoakes (Oracle)
2026-03-20 10:59 ` Pedro Falcato
2026-03-20 11:02 ` David Hildenbrand (Arm) [this message]
2026-03-20 11:27 ` Lorenzo Stoakes (Oracle)
2026-03-20 11:01 ` David Hildenbrand (Arm)
2026-03-20 11:45 ` Lorenzo Stoakes (Oracle)
2026-03-23 12:56 ` David Hildenbrand (Arm)
2026-03-20 10:34 ` Pedro Falcato
2026-03-20 10:51 ` Lorenzo Stoakes (Oracle)
2026-03-19 18:31 ` [PATCH 4/4] mm/mprotect: special-case small folios when applying write permissions Pedro Falcato
2026-03-19 19:17 ` Lorenzo Stoakes (Oracle)
2026-03-20 10:36 ` Pedro Falcato
2026-03-20 10:42 ` Lorenzo Stoakes (Oracle)
2026-03-19 21:43 ` David Hildenbrand (Arm)
2026-03-20 10:37 ` Pedro Falcato
2026-03-20 2:42 ` [PATCH 0/4] mm/mprotect: micro-optimization work Andrew Morton
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